1) The document describes the structure of materials at different length scales from atomic to macroscopic levels. It discusses how atomic structure influences properties and technological applications of materials.
2) Key concepts covered include the structure of the atom, electronic configuration, periodic table, different types of atomic bonding, and how bonding influences properties like conductivity and strength.
3) Examples calculate the number of atoms in materials and compare properties like electronegativity between elements. Diagrams illustrate different types of bonding and how structure determines properties.
Indian Rail Steel- Pearlitic and Bainitic Rails and comparisionMukuldev Khunte
This is the comparative analysis of composition and microstructure of Indian rail steel. In which the method of hardening of material has been studied.
Guided By
Prof. CB Singh
This module deals with the classification of the engineering materials and their processing techniques. The engineering materials can broadly be classified as:a) Ferrous Metals ,b) Non-ferrous Metals (aluminum, magnesium, copper, nickel, titanium) ,c) Plastics (thermoplastics, thermosets) ,d) Ceramics and Diamond,e) Composite Materials & f) Nano-materials.
This presentation contains information about some basic electrical parameters such as Voltage, Current, EMF, PD, Electric Power, Energy Ideal & Practical Sources, Types of Resistance, Heating Effect, Magnetic effect & Chemical effect of Electric Current etc.
Indian Rail Steel- Pearlitic and Bainitic Rails and comparisionMukuldev Khunte
This is the comparative analysis of composition and microstructure of Indian rail steel. In which the method of hardening of material has been studied.
Guided By
Prof. CB Singh
This module deals with the classification of the engineering materials and their processing techniques. The engineering materials can broadly be classified as:a) Ferrous Metals ,b) Non-ferrous Metals (aluminum, magnesium, copper, nickel, titanium) ,c) Plastics (thermoplastics, thermosets) ,d) Ceramics and Diamond,e) Composite Materials & f) Nano-materials.
This presentation contains information about some basic electrical parameters such as Voltage, Current, EMF, PD, Electric Power, Energy Ideal & Practical Sources, Types of Resistance, Heating Effect, Magnetic effect & Chemical effect of Electric Current etc.
This lesson highlights the classification of the engineering materials and their processing techniques. The engineering materials can broadly be classified as:
a) Ferrous Metals
b) Non-ferrous Metals (aluminum, magnesium, copper, nickel, titanium)
c) Plastics (thermoplastics, thermosets)
d) Ceramics and Diamond
e) Composite Materials & f) Nano-materials.
The engineering materials are often primarily selected based on their mechanical, physical, chemical and manufacturing properties. The secondary factors to be considered are the cost and availability, appearance, service life and recyclability.
Fundamentals 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.
The Wien bridge is a type of bridge circuit that was developed by Max Wien in 1891. The bridge consists of four resistors and two capacitors. At the time of the Wien bridge's invention, bridge circuits were a common way of measuring component values by comparing them to known values.
Topic related to material science and metallurgy, Includes basic information about steel.Also the Iron-Iron Carbon Diagrams and its structures with various features of fe-c diagram.
Basic concept of Electrochemical machining process with its advantages, limitations and applications as well as video and figure to understand this process better.
In the material testing laboratory, a Charpy impact test was performed on three different types (hot,cold,and steel alloy)of steels testing each variety at four different temperatures (32°C(RT), 100°C,0°C and -22°C ). From results (shown below), we determined that the a transition is from ductile failures to brittle failures
This presentation is the basic of engineering materials. More presenetation will be added soon. If you like the work, please click on like button and do share. Thanks
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
This lesson highlights the classification of the engineering materials and their processing techniques. The engineering materials can broadly be classified as:
a) Ferrous Metals
b) Non-ferrous Metals (aluminum, magnesium, copper, nickel, titanium)
c) Plastics (thermoplastics, thermosets)
d) Ceramics and Diamond
e) Composite Materials & f) Nano-materials.
The engineering materials are often primarily selected based on their mechanical, physical, chemical and manufacturing properties. The secondary factors to be considered are the cost and availability, appearance, service life and recyclability.
Fundamentals 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.
The Wien bridge is a type of bridge circuit that was developed by Max Wien in 1891. The bridge consists of four resistors and two capacitors. At the time of the Wien bridge's invention, bridge circuits were a common way of measuring component values by comparing them to known values.
Topic related to material science and metallurgy, Includes basic information about steel.Also the Iron-Iron Carbon Diagrams and its structures with various features of fe-c diagram.
Basic concept of Electrochemical machining process with its advantages, limitations and applications as well as video and figure to understand this process better.
In the material testing laboratory, a Charpy impact test was performed on three different types (hot,cold,and steel alloy)of steels testing each variety at four different temperatures (32°C(RT), 100°C,0°C and -22°C ). From results (shown below), we determined that the a transition is from ductile failures to brittle failures
This presentation is the basic of engineering materials. More presenetation will be added soon. If you like the work, please click on like button and do share. Thanks
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
FellowBuddy.com is a platform which has been setup with a simple vision, keeping in mind the dynamic requirements of students.
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.”
Like Us - https://www.facebook.com/FellowBuddycom-446240585585480
Chemical bonding xi , dr.mona srivastava , founder masterchemclassesDR MONA Srivastava
Viewers,
This ppt of chemical bonding is designed to give a complete idea and though conceptual extract of the topic for the students of XI to help them understand the basics of chemical bonding in chemistry. Hope it covers all important aspects and points .
Dr Mona Srivastava
Founder-
Masterchemclasses
How do we describe the bonding between transition metal (ions) and their ligands (like water, ammonia, CO etc) ?
The Crystal Field Model gives a simple theory to explain electronic spectra.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
engineering material atomic structure of atom Lecture2.
1. 1
1
The Science and Engineering
of Materials, 6th Ed
Donald R. Askeland – Pradeep P. Phulé
Chapter 2 – Atomic Structure
2. 2 2
Objectives of Chapter 2
The goal of this chapter is to describe the
underlying physical concepts related to the
structure of matter.
To examine the relationships between
structure of atoms-bonds-properties of
engineering materials.
Learn about different levels of structure i.e.
atomic structure, nanostructure,
microstructure, and macrostructure.
3. 3 3
Chapter Outline
2.1 The Structure of Materials:
Technological Relevance
2.2 The Structure of the Atom
2.3 The Electronic Structure of the
Atom
2.4 The Periodic Table
2.5 Atomic Bonding
2.6 Binding Energy and Interatomic
Spacing
4. 4 4
Introduction
The Structure of the materials
The structure of a material is the arrangement of atoms
and ions in the material.
The atomic structure is the nucleus consisting of protons
and neutrons and the electrons surrounding the nucleus.
The dia of atoms is measured in angstrom
The amorphous materials have a short range ordering of
atoms or ions. While crystalline exhibit periodic
arrangement of atoms and ions.
The nanostructure is the structure of a material at
length scale of 1 to 100 nm.
The microstructure is the structure of a material at
length scale of 100 to 100000 nm. Where the
macrostructure is at a length scale of > 100 um.
6. 6 6
Level of Structure Example of Technologies
Atomic Structure Diamond – edge of
cutting tools
Atomic Arrangements: Lead-zirconium-titanate
Long-Range Order [Pb(Zrx Ti1-x )] or PZT –
(LRO) gas igniters, vib. control
Atomic Arrangements: Amorphous silica - fiber
Short-Range Order optical communications
(SRO) industry.
Figures 2.2 – 2.4
Table 2.1 Levels of Structure
7. 7 7
Level of Structure Example of Technologies
Nanostructure Nano-sized particles of
iron oxide – ferrofluids
Microstructure Mechanical strength of
metals and alloys
Macrostructure Paints for automobiles
for corrosion resistance
& aesthetics.
Figures 2.5 – 2.7
Table 2.1 (Continued)
8. 8 8
Section 2.2
The Structure of the Atom
The atomic number of an element is equal to the
number of electrons or protons in each atom.
The atomic mass of an element is equal to the average
number of protons and neutrons in the atom.
The Avogadro number of an element is the number of
atoms or molecules in a mole.
The atomic mass unit of an element is the mass of an
atom expressed as 1/12 the mass of a carbon atom.
9. 9 9
Calculate the number of atoms in 100 g of silver.
Example 2.1 SOLUTION
The atomic mass or weight of silver is 107.868 g/mole.
The number of silver atoms is =
)868.107(
)10023.6)(100( 23
mol
g
mol
atomsg
5.58 1023
Example 2.1
Calculate the Number of Atoms in Silver
10. 10 10
Scientists are considering using nano-particles of such
magnetic materials as iron-platinum (Fe-Pt) as a
medium for ultrahigh density data storage. Arrays of
such particles potentially can lead to storage of
trillions of bits of data per square inch—a capacity that
will be 10 to 100 times higher than any other devices
such as computer hard disks. If these scientists
considered iron (Fe) particles that are 3 nm in
diameter, what will be the number of atoms in one
such particle?
Example 2.2
Nano-Sized Iron-Platinum Particles
For Information Storage
11. 11 11
Example 2.2 SOLUTION
The radius of a particle is 1.5 nm.
Volume of each iron magnetic nano-particle
= (4/3)(1.5 10-7 cm)3
= 1.4137 10-20 cm3
Density of iron = 7.8 g/cm3. Atomic mass of iron
is 56 g/mol.
Mass of each iron nano-particle
= 7.8 g/cm3 1.4137 10-20 cm3
= 1.102 10-19 g.
One mole or 56 g of Fe contains 6.023 1023
atoms, therefore, the number of atoms in one
Fe nano-particle will be 1186.
12. 12
Electron occupy energy levels within the atom.
Quantum numbers are the numbers that assign electrons
in an atom to discrete energy levels.
A quantum shell is a set of fixed energy levels to which
electrons belong.
Pauli exclusion principle specifies that no more than two
electrons in a material can have the same energy. The
two electrons have opposite magnetic spins.
Section 2.3 The Electronic Structure
of the Atom
13. 13
The valence of an atom is the number of electrons in an
atom that participate in bonding or chemical reactions.
Electro negativity describes the tendency of an atom to
gain an electron.
Electropositive element is an element whose atoms want
to participate in chemical interactions by donating
electrons and are therefore highly reactive.
Section 2.3 The Electronic Structure
of the Atom
16. 16 16
The aufbau principle is the graphical device used to determine
the order in which the energy levels of quantum shells are filled
by electrons.
Electronic structure of Fe with atomic number of 26.
Electronic structure:
Aufbau principle
17. 17 17
Using the electronic structures, compare the electronegativities
of calcium (20) and bromine (35).
Example 16.9
Comparing Electronegativities
18. 18 18
Example
SOLUTION
The electronic structures, obtained from Appendix C, are:
Ca: 1s22s22p63s23p6 4s2
Br: 1s22s22p63s23p63d10 4s24p5
Calcium has two electrons in its outer 4s orbital and bromine
has seven electrons in its outer 4s4p orbital. Calcium, with an
electronegativity of 1.0, tends to give up electrons and has low
electronegativity, but bromine, with an electronegativity of 2.8,
tends to accept electrons and is strongly electronegative. This
difference in electronegativity values suggests that these
elements may react readily to form a compound.
Example 16.9
Comparing Electronegativities
19. 19 19
Periodic table gives valuable information about specific
elements such as atomic size, melting point, chemical
reactivity etc.
Rows in the PT corresponds to the quantum shells.
Columns refer to the number of electrons in the
outermost s and p energy levels.
Polymers (plastics) mainly based on carbon appear in
group B.
Ceramics based on combination of groups 1 through 5B
such as oxygen, carbon and nitrogen.
Section 2.4 The Periodic Table
21. 21 21
III-V semiconductor is a semiconductor that is based on
group 3A and 5B elements (e.g. GaAs).
II-VI semiconductor is a semiconductor that is based on
group 2B and 6B elements (e.g. CdSe).
Transition elements are the elements whose electronic
configurations are such that their inner “d” and “f” levels
begin to fill up such as vanadium, iron ,nickel cobalt etc..
Section 2.4 The Periodic Table
22. 22 22
Metallic bond, Covalent bond, Ionic bond, van der Waals
bond are the different types of bonds.
Ductility refers to the ability of materials to be stretched
or bent without breaking
Section 2.5 Atomic Bonding
25. 25 25
Example
Calculating the Conductivity of Silver
Calculate the number of electrons capable of conducting an
electrical charge in ten cubic centimeters of silver.
Example 2.5 SOLUTION
The valence of silver is one, and only the valence electrons are
expected to conduct the electrical charge. From Appendix A, we
find that the density of silver is 10.49 g/cm3. The atomic mass of
silver is 107.868 g/mol.
Mass of 10 cm3 = (10 cm3)(10.49 g/cm3) = 104.9 g
Atoms =
Electrons = (5.85 1023 atoms)(1 valence electron/atom)
= 5.85 1023 valence electron/atom per 10 cm3
23
23
1085.5
/868.107
)/10023.6)(9.104(
molg
molatomsg
28. 28 28
Example 2.6
How Do Oxygen and Silicon Atoms Join to
Form Silica?
Assuming that silica (SiO2) has 100% covalent bonding,
describe how oxygen and silicon atoms in silica (SiO2) are
joined.
Example SOLUTION
Silicon has a valence of four and shares electrons with four
oxygen atoms, thus giving a total of eight electrons for
each silicon atom. However, oxygen has a valence of six
and shares electrons with two silicon atoms, giving oxygen
a total of eight electrons. Figure 2-16 illustrates one of the
possible structures.Similar to silicon (Si), a tetrahedral
structure also is produced. We will discuss later in this
chapter how to account for the ionic and covalent nature
of bonding in silica.
31. 31 31
Example
Describing the Ionic Bond Between
Magnesium and Chlorine
Describe the ionic bonding between magnesium (12)
and chlorine (17).
32. 32 32
Example
Describing the Ionic Bond Between
Magnesium and Chlorine
Describe the ionic bonding between magnesium and
chlorine.
Example 2.8 SOLUTION
The electronic structures and valences are:
Mg: 1s22s22p6 3s2 valence = 2
Cl: 1s22s22p6 3s23p5 valence = 7
Each magnesium atom gives up its two valence
electrons, becoming a Mg2+ ion. Each chlorine atom
accepts one electron, becoming a Cl- ion. To satisfy the
ionic bonding, there must be twice as many chloride
ions as magnesium ions present, and a compound,
MgCl2, is formed.
36. 36 36
Interatomic spacing is the equilibrium spacing between
the centers of two atoms.
Binding energy is the energy required to separate two
atoms from their equilibrium spacing to an infinite
distance apart.
Modulus of elasticity is the slope of the stress-strain
curve in the elastic region (E).
Yield strength is the level of stress above which a
material begins to show permanent deformation.
Coefficient of thermal expansion (CTE) is the amount by
which a material changes its dimensions when the
temperature changes.
Section 2.6 Binding Energy and
Interatomic Spacing