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Body Temperature01:25

Body Temperature

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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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Body Temperature01:07

Body Temperature

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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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Effects of Temperature on Free Energy

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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:
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Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

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When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
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Factors Affecting Body Temperature01:28

Factors Affecting Body Temperature

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

Increased Body Temperature

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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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Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds
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Surface Zn doped LiMn2O4 for an improved high temperature performance.

Jun-Yu Piao1, Shu-Yi Duan, Xi-Jie Lin

  • 1CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. anmin_cao@iccas.ac.cn wanlijun@iccas.ac.cn.

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Surface doping with zinc oxide nanoshells stabilizes lithium manganese oxide (LiMn2O4) particles. This method significantly improves high-temperature performance and reduces manganese dissolution in batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Lithium manganese oxide (LiMn2O4) is a promising cathode material for lithium-ion batteries.
  • High-temperature performance and manganese dissolution are critical challenges for LiMn2O4 stability.

Purpose of the Study:

  • To develop a surface doping strategy for stabilizing LiMn2O4.
  • To enhance the high-temperature performance and electrochemical stability of LiMn2O4.

Main Methods:

  • A surface solid reaction between LiMn2O4 particles and ZnO nanoshells was employed.
  • Characterization of the surface-treated material and evaluation of its electrochemical properties at elevated temperatures.

Main Results:

  • The surface treatment effectively stabilized LiMn2O4 particles.
  • The ZnO nanoshell coating significantly suppressed manganese dissolution.
  • The surface-modified LiMn2O4 exhibited improved high-temperature performance.

Conclusions:

  • Surface doping with ZnO nanoshells is an effective strategy for stabilizing LiMn2O4.
  • This approach offers a pathway to enhance the durability and performance of lithium-ion batteries utilizing LiMn2O4 cathodes.