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What is a Mode?01:07

What is a Mode?

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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
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Passive Filters01:27

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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.
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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.
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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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High-throughput countercurrent microextraction in passive mode.

Tingliang Xie1, Cong Xu

  • 1Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing, 100084, P.R. China. c-xu@mail.tsinghua.edu.cn.

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This summary is machine-generated.

A novel passive microextractor enables robust countercurrent microextraction (CCME) with significantly higher throughputs and efficiencies than previous systems. This breakthrough could expand the use of CCME in various scientific and industrial applications.

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Area of Science:

  • Chemical Engineering
  • Separation Science
  • Analytical Chemistry

Background:

  • Microextraction offers higher efficiency than macroextraction but faces limitations in throughput and system robustness.
  • Conventional countercurrent microextraction (CCME) systems are often complex and difficult to construct reliably.
  • Low throughputs hinder the widespread practical application of microextraction techniques.

Purpose of the Study:

  • To develop a robust countercurrent microextraction (CCME) process with high throughput.
  • To introduce a novel passive microextractor design for efficient liquid-liquid mixing and extraction.
  • To evaluate the performance of the new CCME system in terms of extraction efficiency and hydraulic characteristics.

Main Methods:

  • A novel passive microextractor with four units and internal recirculation was designed and constructed.
  • Experimental investigations were conducted to assess hydraulic properties and extraction/back-extraction performance.
  • The passive CCME system was operated without any moving parts for enhanced robustness.

Main Results:

  • The passive CCME system demonstrated recovery efficiencies 1.43–1.68 times greater than cocurrent extraction.
  • Total throughput of the developed passive CCME was one to three orders of magnitude higher than existing systems.
  • The system achieved efficient mixing of immiscible liquids through internal recirculation.

Conclusions:

  • A robust, high-throughput passive CCME process has been successfully established.
  • The novel microextractor design overcomes limitations of previous CCME systems.
  • This advancement is expected to promote broader applications of passive CCME across diverse fields.