Scanning electron microscopes (SEM) and transmission electron microscopes (TEM) were developed to overcome limitations of light microscopes and enable higher magnification. SEM uses a focused beam of electrons to scan sample surfaces, revealing topography, composition, and other properties. TEM transmits electrons through thin samples to form magnified images and diffraction patterns, allowing visualization of structures like organelles and crystal structures. While both use electron beams, SEM analyzes surface features and TEM transmits through samples, giving each technique different applications and resolution capabilities.
SEM is a type of electron microscope designed for directly studying the surfaces of solid objects, that utilizes a beam of focused electron of relatively low energy as an electron probe that is scanned in a regular manner over the specimen.
SEM is a type of electron microscope designed for directly studying the surfaces of solid objects, that utilizes a beam of focused electron of relatively low energy as an electron probe that is scanned in a regular manner over the specimen.
A scanning electron microscope is a type of electron microscope that produces images of a sample by scanning the surface with a focused beam of electrons. The electrons interact with atoms in the sample, producing various signals that contain information about the sample's surface topography and composition.
SEMs can magnify an object from about 10 times up to 300,000 times. A scale bar is often provided on an SEM image. From this the actual size of structures in the image can be calculated.
A scanning electron microscope (SEM) is a type of electron microscope that produces images of a sample by scanning the surface with a focused beam of electrons.
Transmission electron microscopy (TEM)- by sivasangari Shanmugam. Transmission electron microscopy (TEM) is a technique used to observe the features of very small specimens.
A scanning electron microscope is a type of electron microscope that produces images of a sample by scanning the surface with a focused beam of electrons. The electrons interact with atoms in the sample, producing various signals that contain information about the sample's surface topography and composition.
SEMs can magnify an object from about 10 times up to 300,000 times. A scale bar is often provided on an SEM image. From this the actual size of structures in the image can be calculated.
A scanning electron microscope (SEM) is a type of electron microscope that produces images of a sample by scanning the surface with a focused beam of electrons.
Transmission electron microscopy (TEM)- by sivasangari Shanmugam. Transmission electron microscopy (TEM) is a technique used to observe the features of very small specimens.
Electron microscopy (EM) is a technique for obtaining high resolution images of biological and non-biological specimens. It is used in biomedical research to investigate the detailed structure of tissues, cells, organelles and macromolecular complexes
Method for measuring or investigation of fiber structureShawan Roy
Method for measuring or investigation of fiber structure (details about optical and X-ray diffraction & electron microscopy and electron diffraction method)
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
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Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
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We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
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Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
2. Why We Need Electron
Microscope?
Light Microscopes are limited by the physics of light to
500x or 1000x magnification and a resolution of 0.2
micrometers.
In the early 1930's there was a scientific desire to see the
fine details of the interior structures of organic cells
(nucleus, mitochondria...etc.).
This required 10,000x plus magnification which was just
not possible using Light Microscopes.
3. HISTORY OF ELECTRON
MICROSCOPE
1897
J.J. Thompson Discovered electron
1924
Louis DE Broglie Identified wavelength of
electron(≈hν)
1926
Knoll & Ruska built Ist electron microscope
1938
First practical Microscope built by Siemens
1940
Commercial Microscope with 2.4 nm resolution
1945
1.0 nm resolution
5. Optical Microscope
Electron Microscope
1.
Uses optical glass lens.
Uses magnetic lens.
2.
Have low magnification (500X or
1000X appx.)
Have high magnification
(10000X appx.)
3.
Does not require vaccum for
operation.
Require vaccum for operation.
4.
Small depth of field.
Large depth of field.
5.
Low price.
High price.
6. Introduction :
Electron microscopes are scientific instruments that use a
beam of energetic electron to examine objects on a very
fine scale.
Electron microscopes are develop due to the limitations of
light microscopes which are limited by physics of light.
In early 1930 theoretical limit has been reaches and there
was a scientific desire to see the fine details of interior
structure of organic cells.
This require 10000X plus magnification which was not
possible using current optical microscope.
7. SCANNING ELECTRON MICROSCOPE
(SEM)
A scanning electron microscope (SEM) is a
type of electron microscope that images a
sample by scanning it with a high-energy beam
of electrons in a raster scan pattern. The
electrons interact with the atoms that make up
the sample producing signals that contain
information about the sample's surface
topography, composition, and other properties.
8. Characteristics that can be viewed on
SEM :
Topography
The surface features of an object or "how it looks", its texture; direct
relation between these features and materials properties.
Morphology
The shape and size of the particles making up the object; direct
relation between these structures and materials properties
Composition
The elements and compounds that the object is composed of and the
relative amounts of them; direct relationship between composition and
materials properties
Crystallographic Information
How the atoms are arranged in the object; direct relation between
these arrangements and material properties
13. Transmission Electron Microscope :
The transmission electron microscope was the
first type of electron microscope to be developed
and is patterned exactly on the light transmission
microscope except that a focused beam of
electrons is used instead of light to "see through"
the specimen. It was developed by Max Knoll
and Ernst Ruska in Germany in 1931.
TEMs find application in cancer
research, virology, material science as well as
pollution, nanotechnology and semiconductor
research.
14. Transmission Electron Microscopy
In a conventional transmission electron microscope, a thin
specimen is irradiated with an electron beam of uniform
current density.
Electrons are emitted from the electron gun and illuminate
the specimen through a two or three stage condenser lens
system.
Objective lens provides the formation of either image or
diffraction pattern of the specimen.
The electron intensity distribution behind the specimen is
magnified with a three or four stage lens system and viewed
on a fluorescent screen. The image can be recorded by
direct exposure of a photographic emulsion or an image
plate or digitally by a CCD camera.
15. Design Of Transmission
Electron Microscope
A simplified ray
diagram of a TEM
consists of an
electron source,
condenser lens
with aperture,
specimen,
objective lens
with aperture,
projector lens and
fluorescent screen.
17. EXAMPLE OF DIFFRACTION PATTERN
In this case incident beam direction B [100] in an Aluminum (f,c.c),
single crystal specimen. Transmitted beam is marked as T and the
arrangement of the diffracted beams D around the transmitted beam
is the characteristic of the four fold symmetry of the [100] cube axis
of Aluminum.
18. Single Crystal Diffraction Pattern
Single crystal are most ordered (lattice type such as f.c.c, b.c.c, s.c etc.)
among the three structures.
Electron beam passing through a single crystal will produce a pattern of
spots.
Type of crystal structure (f.c.c., b.c.c.) and the "lattice parameter" (i.e., the
distance between adjacent planes) can be determined.
Also, the orientation of the single crystal can be determined: if the single
crystal is turned or flipped, the spot diffraction pattern will rotate around
the centre beam spot in a predictable way.
20. Difference Between SEM & TEM :
SEM is based on scattered electrons while TEM is based on
transmitted electrons.
The sample in TEM has to be cut thinner whereas there is no
such need with SEM sample.
SEM allows for large amount of sample to be analysed at a time
whereas with TEM only small amount of sample can be analysed
at a time.
SEM is used for surfaces, powders, polished & etched
microstructures, IC chips, chemical segregation whereas TEM is
used for imaging of dislocations, tiny precipitates, grain
boundaries and other defect structures in solids
TEM has much higher resolution than SEM.