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Elements and Compounds01:27

Elements and Compounds

104.7K
Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond.
Elements
Elements are classified as atomic or molecular based on the nature of their basic units. They are unique forms of matter with specific chemical and physical properties that cannot break down into smaller substances by ordinary chemical reactions. There...
104.7K
Classification of Elements and Compounds02:54

Classification of Elements and Compounds

73.2K
Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
73.2K
Periodic Classification of the Elements04:00

Periodic Classification of the Elements

59.0K
The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
59.0K
Key Elements for Plant Nutrition02:35

Key Elements for Plant Nutrition

24.3K
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
24.3K
Elements: Chemical Symbols and Isotopes02:31

Elements: Chemical Symbols and Isotopes

126.1K
A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
126.1K
The Periodic Table and Organismal Elements00:57

The Periodic Table and Organismal Elements

202.7K
Overview
202.7K

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Related Experiment Video

Updated: Feb 2, 2026

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
08:53

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

Published on: December 3, 2016

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Single Element Remote-PPG.

Wenjin Wang, Albertus C Den Brinker, Gerard De Haan

    IEEE Transactions on Bio-Medical Engineering
    |November 27, 2018
    PubMed
    Summary

    This study introduces single-element sensing for contactless pulse-rate monitoring, enhancing privacy by avoiding facial analysis. A novel Soft Signature based extraction (SoftSig) method effectively extracts pulse signals from non-facial data.

    Area of Science:

    • Biomedical Engineering
    • Signal Processing
    • Wearable Technology

    Background:

    • Camera-based remote photoplethysmography (remote-PPG) enables contactless pulse-rate monitoring but often relies on facial analysis.
    • Facial analysis in remote-PPG raises privacy concerns, particularly with regulations like GDPR.
    • Existing remote-PPG methods struggle with signals containing non-skin components, limiting their application in privacy-preserving setups.

    Purpose of the Study:

    • To investigate the feasibility of using single-element sensing for remote-PPG extraction, bypassing facial analysis.
    • To develop a novel remote-PPG method robust to non-skin signal components.
    • To address privacy concerns and improve data efficiency in contactless pulse monitoring.

    Main Methods:

    • Exploration of single-element sensing as an alternative input for remote-PPG.

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  • Development of a new Soft Signature based extraction (SoftSig) algorithm to handle mixed skin and non-skin signals.
  • Validation through large-scale experiments to assess the performance of single-element remote-PPG and the SoftSig method.

    • Main Results:

    • Demonstrated the viability of single-element sensing for remote-PPG, effectively eliminating the need for facial analysis.
    • The proposed SoftSig method showed improved pulse extraction performance compared to general-purpose solutions in single-element setups.
    • Single-element sensing significantly enhances data storage and transmission efficiency.

    Conclusions:

    • Single-element sensing offers a privacy-preserving and efficient alternative for remote-PPG.
    • The SoftSig method provides a robust solution for pulse extraction from signals with non-skin components.
    • This approach opens new avenues for contactless vital sign monitoring in diverse applications.