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Related Concept Videos

Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Active versus Passive Immunity01:31

Active versus Passive Immunity

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Immunity, along with the ability to limit pathogen growth to prevent significant body tissue damage, can be gained either by (1) actively developing an immune response within the individual after exposure to a pathogen or after getting vaccinated or (2) passively transferring immune components from an immune individual to one who is nonimmune. Both these forms of immunity can be found naturally and in medical practices.
Active Immunity
Active immunity refers to the resistance one develops...
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Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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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.
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Effects of Temperature on Free Energy02:11

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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Related Experiment Video

Updated: Jan 30, 2026

Mouse Body Temperature Measurement Using Infrared Thermometer During Passive Systemic Anaphylaxis and Food Allergy Evaluation
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Room-Temperature Midwavelength Infrared InAsSb Nanowire Photodetector Arrays with Al2O3 Passivation.

Dingkun Ren1, Khalifa M Azizur-Rahman2, Zixuan Rong1

  • 1Department of Electrical and Computer Engineering , University of California, Los Angeles , Los Angeles , California 90095 , United States.

Nano Letters
|January 25, 2019
PubMed
Summary

We developed uncooled midwavelength infrared (MWIR) photodetectors using InAsSb nanowires on InP substrates. These devices achieve room-temperature operation and spectral response up to 3.4 μm, enabling compact infrared detection platforms.

Keywords:
Al2O3InAsSbMWIRNanowirepassivationphotodetectoruncooled

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Uncooled midwavelength infrared (MWIR) photodetectors are crucial for remote sensing and heat-seeking applications.
  • Existing technologies face challenges in achieving high performance at room temperature.

Purpose of the Study:

  • To demonstrate room-temperature operation of MWIR photodetectors using InAsSb nanowires.
  • To improve photodetector efficiency by suppressing surface recombination.
  • To enable compact and integrated MWIR detection platforms on low-cost substrates.

Main Methods:

  • Fabrication of vertical selective-area InAsSb nanowire arrays on InP substrates.
  • Introduction of conformal Al2O3 passivation shells to suppress nonradiative recombination.
  • Development of a dry-etching process for optimized metal contact fabrication.
  • Characterization of room-temperature photoluminescence and spectral response.

Main Results:

  • Achieved room-temperature operation of MWIR photodetectors with spectral response up to 3.4 μm.
  • Significantly suppressed nonradiative recombination with an estimated surface recombination velocity of 10^3 cm/s.
  • Demonstrated room-temperature photoluminescence emission spanning the entire MWIR regime (3-5 μm).

Conclusions:

  • Nanowire-based photodetectors with surface passivation offer a promising route for uncooled MWIR focal plane arrays.
  • The use of InP substrates and nanostructured absorbers facilitates the design of compact and integrated detection platforms.
  • This approach paves the way for low-cost, high-performance MWIR sensing technologies.