The document discusses the structure of crystalline solids. It explains that crystalline materials have orderly repeating atomic patterns extending in three dimensions, which gives rise to different crystal structures like FCC, BCC, and HCP. The crystal structure determines properties and affects whether a material is isotropic or anisotropic. Polycrystalline materials tend to have isotropic properties while single crystals are anisotropic.
Crystal Material, Non-Crystalline Material, Crystal Structure, Space Lattice, Unit Cell, Crystal Systems, and Bravais Lattices, Simple Cubic Lattice, Body-Centered Cubic Structure, Face centered cubic structure, No of Atoms per Unit Cell, Atomic Radius, Atomic Packing Factor, Coordination Number, Crystal Defects, Point Defects, Line Defects, Planar Defects, Volume Defects.
FellowBuddy.com is an innovative platform that brings students together to share notes, exam papers, study guides, project reports and presentation for upcoming exams.
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Crystal Material, Non-Crystalline Material, Crystal Structure, Space Lattice, Unit Cell, Crystal Systems, and Bravais Lattices, Simple Cubic Lattice, Body-Centered Cubic Structure, Face centered cubic structure, No of Atoms per Unit Cell, Atomic Radius, Atomic Packing Factor, Coordination Number, Crystal Defects, Point Defects, Line Defects, Planar Defects, Volume Defects.
FellowBuddy.com is an innovative platform that brings students together to share notes, exam papers, study guides, project reports and presentation for upcoming exams.
We connect Students who have an understanding of course material with Students who need help.
Benefits:-
# Students can catch up on notes they missed because of an absence.
# Underachievers can find peer developed notes that break down lecture and study material in a way that they can understand
# Students can earn better grades, save time and study effectively
Our Vision & Mission – Simplifying Students Life
Our Belief – “The great breakthrough in your life comes when you realize it, that you can learn anything you need to learn; to accomplish any goal that you have set for yourself. This means there are no limits on what you can be, have or do.”
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The study of crystal geometry helps to understand the behaviour of solids and their
mechanical,
electrical,
magnetic
optical and
Metallurgical properties
Space lattice, Unit cell, Bravais lattices (3-D), Miller indices, Lattice planes, Hexagonal closed packing (hcp) structure, Characteristics of an hcp cell, Imperfections in crystal: Point defects (Concentration of Frenkel and Schottky defects).
X – ray diffraction : Bragg’s law and Bragg’s spectrometer, Powder method, Rotating crystal method.
A detail description of crystal structure as well as different kind of crystal structure such simple cubic , body centric cubic and face centric cubic.
undamentals of Crystal Structure: BCC, FCC and HCP Structures, coordination number and atomic packing factors, crystal imperfections -point line and surface imperfections. Atomic Diffusion: Phenomenon, Fick’s laws of diffusion, factors affecting diffusion.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
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.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
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
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
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.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
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.
When stars align: studies in data quality, knowledge graphs, and machine lear...
Crystal structure of metal
1.
2. WHY STUDY The Structure of Crystalline Solids?
The properties of some materials are directly related to
their crystal structures. i.e. pure and undeformed
magnesium and beryllium, having one crystal structure,
are much more brittle (lower degrees of deformation) than
are pure and undeformed metals such as gold and silver
that have yet another crystal structure.
A knowledge of the crystal structure for iron helps us
understand transformations that occur when steels are
heat treated to improve their mechanical properties.
Furthermore, significant property differences exist
between crystalline and noncrystalline materials having
the same composition.
3. Learning Objective
ISSUES TO ADDRESS...
Difference in atomic/molecular structure between
crystalline and noncrystalline materials.
unit cells for face-centered cubic, body centered
cubic, and hexagonal close-packed crystal structures.
Distinguish between single crystals and
polycrystalline materials.
Define isotropy and anisotropy with respect to
material properties.
4. A crystalline material is one in which the atoms are situated
in an orderly, repeating pattern extending in all three
dimension .i.e.Nacl ,CsF etc.
crystalline solids depend on the crystal structure of the
material, the manner in which atoms, ions, or molecules are
spatially(three dimension) arranged.
lattice is used in the context of crystal structures; in this
sense lattice means a three-dimensional array of points
coinciding with atom positions (or sphere centers).
Amorphous solid is one in which the atom are not situated
in an orderly, repeating pattern. i.e. glass , rubber, plastic etc.
Amorphous solid don’t have sharp melting point that is
why particle of glass soften over temperature range.
5. ENERGY AND PACKING
ENERGY AND PACKING
• Non dense, random packing
Dense, regular-packed structures tend to have lower energy
7. The smallest repeating unit in a crystal is a unit cell.
Three-dimensional packing of unit cells produces the
crystal lattice.
There are seven different unit cells:
• Cubic: All three axes have same length and intercept at
right angles.
• Tetragonal: The three axes intercept at right angles, but
one axis is longer or shorter than the other two equal axes.
• Hexagonal: Three of the four axes are in one plane,
intercept at 120°, and are of the same length.
8. • Trigonal(rhombohedral): Same axes as hexagonal,
but angle lie b/w right angle to 120°.
• Orthorhombic: The three axes are of different lengths
and are at right angles to each other.
Monoclinic: The three axes are of different lengths and
two are at right angles to each other. The third axis is
inclined.
Triclinic: All three axes are of different lengths and form
oblique angles.
10. Metallic Crystal Structures
The atomic bonding in this group of materials is
metallic and thus non-directional in nature.
For metals, using the hard-sphere model for the
crystal structure, each sphere represents an ion core.
There are three principle crystal structures for
metals:
Body-center-cubic (BCC)
Face-centered cubic (FCC)
Hexagonal closed packed(HCP)
11. BODY CENTERED CUBIC STRUCTURE
In BCC atoms located at all eight corners and a single atom at
the cube center. This is called a body-centered cubic (BCC)
crystal structure.
example: Cr, W, Fe (), Tantalum, Molybdenum
• Coordination # = 8
2 atoms/unit cell: 1 center + 8 corners x 1/8
• Atoms touch each other along cube diagonals.
--Note: All atoms are identical; the center atom is shaded
differently only for ease of viewing.
12. ATOMIC PACKING FACTOR: BCC
R
a Unit cell contains:
1 + 8 x 1/8
= 2 atoms/unit cell
• APF for a body-centered cubic structure = p3/8 = 0.68
13. FACE CENTERED CUBIC STRUCTURE (FCC)
In FCC atoms located at each of the corners and the centers
of all the cube faces. This is called the face-centered cubic
(FCC) crystal structure.
example: Al, Cu, Au, Pb, Ni, Pt, Ag
Coordination # = 12
4 atoms/unit cell: 6 face x 1/2 + 8 corners x 1/8
Atoms touch each other along face diagonals.
--Note: All atoms are identical; the face-centered atoms are shaded
differently only for ease of viewing.
14. ATOMIC PACKING FACTOR: FCC
2a Unit cell contains:
6 x 1/2 + 8 x 1/8
= 4 atoms/unit cell
a
atoms
4 volume
unit cell 4 p ( 2 a/4 ) 3
3 atom
APF =
volume
a3
unit cell
• APF for a face-centered cubic structure = 0.74
15. FCC Stacking Sequence
• ABCABC... Stacking Sequence
• 2D Projection
B B
C
A
A sites B B B
C C
B sites B B
C sites
A
• FCC Unit Cell B
C
16. Hexagonal Close-Packed Structure (HCP)
• ABAB... Stacking Sequence
• 3D Projection • 2D Projection
A sites
Top layer
c B sites
Middle layer
A sites
Bottom layer
a
• Coordination # = 12
6 atoms/unit cell
• APF = 0.74
ex: Cd, Mg, Ti, Zn
• c/a = 1.633
17. Close packed crystals
A plane
B plane
C plane
A plane
…ABCABCABC… packing …ABABAB… packing
[Face Centered Cubic (FCC)] [Hexagonal Close Packing (HCP)]
18. COMPARISON OF CRYSTAL
STRUCTURES
Crystal structure coordination # packing factor close packed directions
Body Centered Cubic (BCC) 8 0.68 body diagonal
Face Centered Cubic (FCC) 12 0.74 face diagonal
Hexagonal Close Pack (HCP)12 0.74 hexagonal side
19. SINGLE VS POLYCRYSTALS
• Single Crystals
A single crystal is formed by the growth of a
crystal nucleus without secondary
nucleation or impingement on other
crystals.
-Properties vary with
direction: anisotropic.
-Example: the modulus
of elasticity (E) in BCC iron: 200 mm
• Polycrystals
an object composed of randomly oriented cr
ystals, formed by rapid solidification
-Properties may/may not vary with direction.
-If grains are randomly oriented: isotropic.
(Epoly iron = 210 GPa)
-If grains are textured, anisotropic.
20. Isotropic:
Substances in which measured (physical)properties are independent
of the direction of measurement are isotropic.
ANISOTROPY:
The substance in which physical properties are show variation
with changing the direction . Such substance are called
anisotropic.
A different chemical bonding in all directions is also a
condition for anisotropy.
21. SUMMARY
• Atoms may assemble into crystalline,
polycrystalline or amorphous structures.
• We can predict the density of a material,
provided we know the atomic weight, atomic
radius, and crystal geometry (e.g., FCC,
BCC, HCP).
• Material properties generally vary with single
crystal orientation (i.e., they are anisotropic),
but properties are generally non-directional
(i.e., they are isotropic) in polycrystals with
randomly oriented grains.