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Related Concept Videos

Body Temperature01:07

Body Temperature

1.4K
Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C...
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Body Temperature01:25

Body Temperature

4.1K
The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
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Effects of Temperature on Free Energy02:11

Effects of Temperature on Free Energy

28.0K
The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
28.0K
Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

9.2K
Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
9.2K
Factors Affecting Body Temperature01:28

Factors Affecting Body Temperature

8.7K
As a nurse, it is vital to understand the factors affecting body temperature to monitor variations and effectively evaluate deviations from regular.
Factors may  include:
8.7K
Increased Body Temperature01:25

Increased Body Temperature

6.5K
A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
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Fabrication and Characterization of Superconducting Resonators
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Low-temperature microstructural studies on superconducting CaFe2As2.

S Huyan1, L Z Deng2, Z Wu2

  • 1Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5005, USA. shuyan@uh.edu.

Scientific Reports
|April 25, 2019
PubMed
Summary
This summary is machine-generated.

Superconductivity in undoped Calcium Iron Arsenide (Ca122) emerges due to nanoscale phase admixtures. These interfaces between PI and PII phases are crucial for achieving superconductivity up to 25 K.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Undoped CaFe2As2 (Ca122) exists in two tetragonal phases (PI and PII) that are not superconducting.
  • Superconductivity with critical temperatures (Tc) up to 25 K can be induced in Ca122 through specific annealing processes.
  • The emergence of superconductivity is linked to the presence of both PI and PII phases.

Purpose of the Study:

  • To investigate the structural characteristics of undoped Ca122 samples annealed at 350°C.
  • To understand the relationship between phase distribution and the onset of superconductivity in Ca122.
  • To elucidate the mechanism behind interfacial inducement of superconductivity.

Main Methods:

  • Systematic low-temperature X-ray diffraction (XRD) studies on Ca122 samples annealed for varying durations.
  • Computational simulation of phase distribution to analyze XRD data.
  • High-resolution transmission electron microscopy (HRTEM) to visualize nanoscale structures.

Main Results:

  • A novel, intermediate XRD peak was observed exclusively in superconducting Ca122 samples, shifting with annealing time.
  • Simulations indicated this peak corresponds to nanoscale admixtures of PI and PII phases.
  • HRTEM confirmed the presence of these nanoscale phase mixtures in superconducting samples.

Conclusions:

  • The observed nanoscale phase admixtures are directly correlated with the emergence of superconductivity in undoped Ca122.
  • Interfacial effects between the PI and PII phases are identified as the most plausible mechanism for inducing superconductivity.
  • The findings provide critical insights into the unconventional superconductivity in iron-based materials.