A2 Computing Reverse Polish Notation Part 2
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The document provides an overview of a computing lesson on Reverse Polish Notation (RPN) and use of the stack data structure. It includes the following key points: 1) Objectives are to review RPN concepts, apply RPN to the stack data structure, and review past paper questions. 2) Examples are provided to demonstrate converting infix expressions to postfix RPN and using a stack to evaluate RPN expressions step-by-step. 3) A worksheet exercise is assigned for students to complete, showing their working out. 4) The lesson aims to help students understand where RPN is applied, the differences between infix, prefix and postfix notation, and how RPN relates to the
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1. *Sensory processing*: Insects can detect and respond to various stimuli, such as light, sound, touch, taste, and smell.
2. *Motor control*: The nervous system controls movement, including walking, flying, and feeding.
3. *Behavioral responses*: Insects can exhibit complex behaviors, such as mating, foraging, and social interactions.
Characteristics
1. *Decentralized*: Insect nervous systems have some autonomy in different body parts.
2. *Specialized*: Different parts of the nervous system are specialized for specific functions.
3. *Efficient*: Insect nervous systems are highly efficient, allowing for rapid processing and response to stimuli.
The insect nervous system is a remarkable example of evolutionary adaptation, enabling insects to thrive in diverse environments.
The insect nervous system is a remarkable example of evolutionary adaptation, enabling insects to thrive
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Neutral
Welcome to the fascinating world of acids and bases! Join siblings Ashwin and
Keerthi as they explore the colorful world of substances at their school's
National Science Day fair. Their adventure begins with a mysterious white paper
that reveals hidden messages when sprayed with a special liquid.
In this presentation, we'll discover how different substances can be classified as
acidic, basic, or neutral. We'll explore natural indicators like litmus, red rose
extract, and turmeric that help us identify these substances through color
changes. We'll also learn about neutralization reactions and their applications in
our daily lives.
by sandeep swamy
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✅ Real examples from original research papers
✅ Color-coded diagrams for clarity
✅ Key rules for in-text citation and reference list formatting
✅ Free citation tools like Mendeley & Zotero explained
Whether you're writing a college assignment, dissertation, or academic article, this guide will help you cite your sources correctly, confidently, and consistent.
Created by: Prof. Ishika Ghosh,
Faculty.
📩 For queries or feedback: [email protected]
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What Is a P–N Junction? Learn how P-type and N-type materials join to create a diode.
Depletion Region & Biasing: See how forward and reverse bias shape the voltage–current behavior.
V–I Characteristics: Understand the curve that defines diode operation.
Real-World Uses: Discover common applications in rectifiers, signal clipping, and more.
Ideal for electronics students, hobbyists, and engineers seeking a clear, practical introduction to P–N junction semiconductors.
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All the materials around us are made up of elements. These elements can be broadly divided into two major groups:
Metals
Non-Metals
Each group has its own unique physical and chemical properties. Let's understand them one by one.
Physical Properties
1. Appearance
Metals: Shiny (lustrous). Example: gold, silver, copper.
Non-metals: Dull appearance (except iodine, which is shiny).
2. Hardness
Metals: Generally hard. Example: iron.
Non-metals: Usually soft (except diamond, a form of carbon, which is very hard).
3. State
Metals: Mostly solids at room temperature (except mercury, which is a liquid).
Non-metals: Can be solids, liquids, or gases. Example: oxygen (gas), bromine (liquid), sulphur (solid).
4. Malleability
Metals: Can be hammered into thin sheets (malleable).
Non-metals: Not malleable. They break when hammered (brittle).
5. Ductility
Metals: Can be drawn into wires (ductile).
Non-metals: Not ductile.
6. Conductivity
Metals: Good conductors of heat and electricity.
Non-metals: Poor conductors (except graphite, which is a good conductor).
7. Sonorous Nature
Metals: Produce a ringing sound when struck.
Non-metals: Do not produce sound.
Chemical Properties
1. Reaction with Oxygen
Metals react with oxygen to form metal oxides.
These metal oxides are usually basic.
Non-metals react with oxygen to form non-metallic oxides.
These oxides are usually acidic.
2. Reaction with Water
Metals:
Some react vigorously (e.g., sodium).
Some react slowly (e.g., iron).
Some do not react at all (e.g., gold, silver).
Non-metals: Generally do not react with water.
3. Reaction with Acids
Metals react with acids to produce salt and hydrogen gas.
Non-metals: Do not react with acids.
4. Reaction with Bases
Some non-metals react with bases to form salts, but this is rare.
Metals generally do not react with bases directly (except amphoteric metals like aluminum and zinc).
Displacement Reaction
More reactive metals can displace less reactive metals from their salt solutions.
Uses of Metals
Iron: Making machines, tools, and buildings.
Aluminum: Used in aircraft, utensils.
Copper: Electrical wires.
Gold and Silver: Jewelry.
Zinc: Coating iron to prevent rusting (galvanization).
Uses of Non-Metals
Oxygen: Breathing.
Nitrogen: Fertilizers.
Chlorine: Water purification.
Carbon: Fuel (coal), steel-making (coke).
Iodine: Medicines.
Alloys
An alloy is a mixture of metals or a metal with a non-metal.
Alloys have improved properties like strength, resistance to rusting.
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A2 Computing Reverse Polish Notation Part 2
- 1. Minster School Computing Reverse Polish Notation Part 2 Mr P Stevens [email_address]
- 2. Objectives Review key concepts from earlier RPN theory Apply RPN theory to the Stack Data Structure Review past paper RPN questions Review some aspects of the recent test
- 3. Convert to RPN Review (TP1) Convert the following expressions to RPN A * B + C * D 5 + ((1 + 2) * 4) − 3
- 4. Convert to RPN Review Convert the following expressions to RPN A * B + C * D AB*CD*+ 5 + ((1 + 2) * 4) − 3 12+4*5+3-
- 5. The Stack (A Reminder TP2) The Stack is LIFO To remove an item from the Stack we use the _________ command To place an item on the stack we use the __________ command
- 6. STACK OPERATIONS (TP3) (Example) using stack data structures to do this calculation 3 * 4 + 5 * 6 = 42 RPN = 3 4 * 5 6 * + Stack Operation Input
- 7. STACK OPERATIONS (Example) using stack data structures to do this calculation 3 * 4 + 5 * 6 = 42 RPN = 3 4 * 5 6 * + 12, 30 Pop 6,5 Multiply Push 30 12 Pop 4,3 Multiply Push 12 12, 5 Push 5 5 12, 5, 6 Push 6 6 42 Pop 30, 12 Add Push 42 3, 4 Push 4 4 3 Push 3 3 Stack Operation Input
- 8. Exercise Complete exercise 2 from the worksheet 2 Show your working out neatly
- 9. Plenary Objectives Understand where Polish form notation is applied Understand the terms Infix, Prefix and Postfix Convert expressions into RPN to produce postfix RPN expressions Appreciate how this theory is applied to the stack register Appreciate the role of Binary Tree Structures with RPN Review past paper RPN questions All resources available on the VLE! Test Paper Review