Phase Transformation
Phase Transformation - Related Videos
10:50
Single Phase Transformers
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. Transformers are stationary electric machines that step up or down AC voltage. They are typically formed of primary and secondary coils or windings, where the voltage on the primary is stepped up or down at the secondary, or the other way around. When a voltage is applied to one of the windings and current flows in that winding, flux is induced in the magnetic core, coupling both windings. With an AC...
12:19
Bacterial Transformation: Electroporation
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2023
The term “transformation” refers cellular ingestion of foreign DNA. In nature, transformation can occur in certain types of bacteria. In molecular biology, however, transformation is artificially induced through the creation of pores in the bacterial cell walls. Bacterial cells that are able to take up DNA from the environment are called competent cells. Electrocompetent cells can be produced in the laboratory and transformation of these cells can be achieve via the application of an...
04:33
Bacterial Transformation - Concepts
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2019
Background In early 20th century, pneumonia was accountable for a large portion of infectious disease deaths1. In order to develop an effective vaccine against pneumonia, Frederick Griffith set out to study two different strains of the Streptococcus pneumoniae: a non-virulent strain with a rough appearance (R-strain) and a virulent strain with a smooth appearance (S-strain) due to an outer polysaccharide capsule2. This outer layer of the S-strain bacteria enabled them to withstand the host...
09:51
Single Phase Inverter
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. DC power is unidirectional and flows in one direction, whereas, AC current alternates directions at a frequency of 50-60 Hz. Most common electronic devices are designed to run off of AC power; therefore an input DC source must be inverted to AC. Inverters convert DC voltage to AC through switching action that repeatedly flips the polarity of the input DC source at the output or load side for part of...
11:15
Single Phase Rectifiers
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. A DC power supply is generally considered to be a device that supplies DC, or unidirectional, voltage and current. Batteries are one such power supply, however, they are limited in terms of lifetime and expense. An alternative method to providing unidirectional power is to transform AC line power to DC power using a rectifier. A rectifier is a device that passes current in one direction, and blocks...
FAQs
These variables alter which physical or solid structural form is thermodynamically stable. Changing temperature can favor different phases, while pressure and composition can shift the stability balance in other ways. Chemists therefore evaluate these conditions together when planning a transformation, because selecting suitable values helps control whether melting, crystallization, vaporization, or a solid-state change occurs.
Nucleation establishes the first regions of a new phase, and growth expands those regions as the transformation proceeds. Together, these processes provide a mechanism for converting one phase into another rather than producing an immediate, uniform change throughout the material. Their importance is especially clear when interpreting crystallization and other transformations involving new solid structures.
A material can retain the same overall composition while adopting a different solid structure. Such transformations matter because the structure is part of the material’s phase identity and can influence its properties. Recognizing these changes allows chemists to distinguish ordinary changes in physical state from solid-state transformations that are relevant to crystal synthesis, ceramics, pharmaceuticals, and energy-storage materials.
Phase diagrams help relate composition and processing conditions to the phases expected to be stable. A chemist can use that information to select suitable temperature, pressure, or composition before carrying out a transformation. The resulting phase relationships also support interpretation of whether a process produced crystallization, melting, vaporization, or a change between solid structures.
Controlled transformations support crystal synthesis, alloy design, ceramics, pharmaceuticals, and energy-storage materials. In each area, managing the conditions that govern phase stability helps produce or maintain a desired material form. The broader value is practical: understanding these changes connects chemical processing decisions with the phases and properties targeted in research or manufacturing.
Tracking which phase forms under particular temperature, pressure, or composition conditions helps connect processing conditions with material behavior. Because different physical phases and solid structures represent different material states, identifying the transformation pathway can clarify the resulting properties. This perspective supports the design and evaluation of alloys, crystals, ceramics, pharmaceuticals, and energy-storage materials.