Classical Free Electron Theory (Drude Model) and Quantum Comparison
Classical Free Electron Theory and Assumptions
The Classical Free Electron Theory (or Drude-Lorentz model) treats a metal as a container of free electrons (an “electron gas”) moving randomly within a fixed lattice of positive ions. When an external electric field is applied, these electrons experience a force and “drift” in the opposite direction, creating a current.
Assumptions:
Classical Mechanics:
The free electrons are treated as classical particles and obey Maxwell-Boltzmann statistics.
Free Electrons:
Read MoreEssential Python and Command Line Programming Concepts
Essential Command Line Tools
Terminal Commands
mkdir: Creates a new directory.pwdorcd(orchdir): Shows the current working directory.- Changing Directory Example: To change the current directory to the ‘SI206’ folder (if you are currently in its parent folder, ‘Fall22’), use
cd SI206.
Git Commands (Version Control)
git clone url: Copies a repository to your local computer.git status: Shows what has changed and what is staged for commit.git add file: Adds a specific file to the staging area for the
Fundamentals of Biology: Cells, Tissues, and Organ Systems
Seven Characteristics of Life
- All living things are highly organized entities composed of one or more cells.
- Use energy for their metabolic activities.
- Respond to environmental stimuli.
- Regulate the internal environment to maintain relatively constant internal conditions (homeostasis).
- Grow and develop.
- Pass genetic material through reproduction.
- Adapt to their environment through evolution.
Biological Levels of Organization
- Cell (e.g., human blood cell)
- Tissue (e.g., human skin tissue)
- Organ and Organ System
Atmospheric Moisture, Humidity, and Evapotranspiration Dynamics
Atmospheric Moisture
Source of Atmospheric Moisture
Atmospheric moisture originates with the gasification of water from oceans, lakes, rivers, soils, vegetation, and wildlife, as well as humanity (breathing). Moisture also results from human activities such as waste combustion and the advent of steam engines.
Humidity and Water Vapor Concepts
Moist Air and Water Vapor
Water vapor is a component of the mixture of atmospheric air. Moist air is defined as a mixture of dry air and water vapor.
Vapor Pressure
Read MoreData Science Core Concepts: Workflow, Models, and Analytics
Data Science Fundamentals and Applications
What is Data Science?
Data Science is a field that uses mathematics, programming, and other techniques to analyze data and discover insights. It helps businesses make better decisions.
Types of Data Science Disciplines
- Data Engineering: Involves designing, building, and managing data infrastructure to help data scientists analyze data.
- Data Analysis: Involves using statistical analysis to answer questions about a business’s data.
- Predictive Analytics: Uses historical
Core Concepts and Theories in Comparative Politics
Comparative Politics: Definition and Scope
Comparative Politics studies and compares domestic political systems across countries. It focuses on power, institutions, and decision-making within states.
The Comparative Method and Challenges
The comparative method identifies causes and effects through comparison and relies mainly on deductive reasoning. Key methodological challenges include:
- Endogeneity: Difficulty distinguishing cause from effect.
- Multicausality: When multiple variables explain one outcome.
Essential Medical Terminology: Clinical Vocabulary and Definitions
A
ABSCESS
A collection of pus.
ACHE
Pain.
AGENCY NURSE
A nurse who works for an agency.
AGGRAVATE
To make worse.
AIRWAY
The trachea or an instrument used for ventilation.
ALLEVIATE
To relieve; to make better.
AMBULANT
Able to walk.
ANESTHETIC
A drug which produces a lack of feeling.
ANGIOGRAM
A type of X-ray procedure.
ANOXAEMIA
A condition characterized by a lack of oxygen in the blood.
ANTENATAL
Before birth.
ANTERIOR
In front of.
ANTIBIOTIC
A drug that destroys bacteria.
ANTIEMETIC
A drug that stops nausea.
ANURIA
A lack
Read MoreDatabase Storage Structures and Index Management Techniques
Database Storage Structures
There are several methods for storing user data in a database, each optimized for different performance and scalability requirements.
Regular Tables
A regular table (generally referred to as a “table”) is the most commonly used form of storing user data.
- The database administrator has very limited control over the distribution of rows in an un-clustered table.
- Rows can be stored in any order depending on the activity on the table.
Partitioned Tables
A partitioned table enables
Read MoreRoman Poets Virgil and Ovid: Biography and Literary Achievements
Virgil: Life and Legacy
Publius Vergilius Maro was born near Mantua. At the age of 25, he moved to Rome where he perfected his studies in rhetoric. He gained the friendship of a patron (likely Maecenas/Augustus) and was admitted to a circle dedicated to poetry. He was devoted to the study of philosophy and the cultivation of poetry. He always kept a reserved profile and was never too comfortable in urban environments. He died after traveling to Greece to view the landscapes that appear in the Aeneid
Read MoreDance History Foundations: Jazz, Hip Hop, and European Ballet Pioneers
Jazz, Tap, and Hip Hop Dance History
Movement Characteristics of Jazz Dance (Myron Howard)
Describe 5 out of 7 movement characteristics of jazz as described by Myron Howard:
-
Gliding, dragging, or shuffling footwork often in low, crouched attitudes.
- Associated with slaves’ barefoot dancing.
- Very similar to “getting down tapping.”
-
A tilting and fluid spine.
This changed the European upright stance and allowed for fluctuation of individual body parts (shoulders, ribs, torso, and pelvis) and a lower,