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Related Concept Videos

Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

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In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
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Special considerations while measuring pulse01:13

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Assessing a patient's pulse is a fundamental skill in healthcare, but certain situations require special attention:
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Pulse rhythm01:30

Pulse rhythm

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Pulse amplitude and quality01:17

Pulse amplitude and quality

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Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
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Bandpass Sampling01:17

Bandpass Sampling

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
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Pulse01:16

Pulse

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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
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Developing a Behavioral Box for Assessing Prepulse Inhibition and Neural Activity in Psychiatric Animal Models
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Sampling to differentiate between pulse and press perturbations.

T M Glasby1, A J Underwood

  • 1Institute of Marine Ecology, Marine Ecology Laboratories, A11 University of Sydney, 2006, N.S.W., Australia.

Environmental Monitoring and Assessment
|November 7, 2013
PubMed
Summary

Distinguishing between pulse (short-term) and press (long-term) disturbances is crucial for effective environmental management. This study proposes a sampling protocol to differentiate disturbance causes and effects for better impact assessment.

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Area of Science:

  • Ecology
  • Environmental Science

Background:

  • Inconsistent terminology ('pulse' vs. 'press') hinders accurate perturbation analysis.
  • Failure to distinguish between the cause and effect of disturbances leads to management challenges.
  • Understanding disturbance type (short-term pulse vs. long-term press) is vital for ecological impact assessment.

Purpose of the Study:

  • To define a sampling protocol that distinguishes between the cause and effect of short-term (pulse) and long-term (press) perturbations.
  • To provide a framework for assessing ecological impacts by differentiating disturbance types.
  • To clarify terminology for environmental disturbance analysis.

Main Methods:

  • Comparing existing and newly-established biological assemblages in disturbed and control locations.
  • Sampling new assemblages to isolate the influence of ongoing (press) disturbances.
  • Utilizing settlement plates and defaunated sediment for new assemblage establishment in aquatic environments.

Main Results:

  • The proposed protocol enables the differentiation of pulse and press disturbance impacts.
  • Distinguishing between past (pulse) and ongoing (press) disturbances is feasible through assemblage comparison.
  • The study illustrates the application of the protocol using estuarine marinas.

Conclusions:

  • A clear distinction between pulse and press disturbances is essential for effective environmental management and impact mitigation.
  • The developed sampling strategy allows for the separation of short-term and long-term disturbance effects.
  • The protocol offers a standardized approach for assessing ecological impacts in various habitats.