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Related Concept Videos

Overview of Advanced Functional Groups02:22

Overview of Advanced Functional Groups

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Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of Advanced Functional Groups
The table below summarizes some of the major functional groups in organic chemistry.
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Second Order systems II01:18

Second Order systems II

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In an underdamped second-order system, where the damping ratio ζ is between 0 and 1, a unit-step input results in a transfer function that, when transformed using the inverse Laplace method, reveals the output response. The output exhibits a damped sinusoidal oscillation, and the difference between the input and output is termed the error signal. This error signal also demonstrates damped oscillatory behavior. Eventually, as the system reaches a steady state, the error diminishes to zero.
406
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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First Order Systems01:21

First Order Systems

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First-order systems, such as RC circuits, are foundational in understanding dynamic systems due to their straightforward input-output relationship. Analyzing their responses to different input functions under zero initial conditions reveals significant insights into system behavior.
When a first-order system is subjected to a unit-step input, its response is characterized by its transfer function. By applying the Laplace transform of the unit-step input to the transfer function, expanding the...
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Second Order systems I01:20

Second Order systems I

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A servo system exemplifies a second-order system, featuring a proportional controller and load elements that ensure the output position aligns with the input position. The relationship between these components is described by a second-order differential equation. Applying the Laplace transform under zero initial conditions yields the transfer function, showing how inputs are converted to outputs in the system.
By reinterpreting the system, one can derive the closed-loop transfer function, which...
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Thermodynamic Systems01:06

Thermodynamic Systems

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A thermodynamic system is a set of objects whose thermodynamic properties are of interest. The system is considered to be embedded in its surroundings or the environment. The system and its environment can exchange heat and do work on each other through a boundary that separates them. However, the immediate surroundings of the system interact with it directly and therefore have a much stronger influence on its behavior and properties.
Consider an example of  tea boiling in a kettle. The...
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Updated: Jan 29, 2026

Techniques for Processing Eyes Implanted with a Retinal Prosthesis for Localized Histopathological Analysis: Part 2 Epiretinal Implants with Retinal Tacks
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Advances in retinal prosthesis systems.

Edward Bloch1, Yvonne Luo2, Lyndon da Cruz1

  • 1Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, London, UK.

Therapeutic Advances in Ophthalmology
|February 8, 2019
PubMed
Summary
This summary is machine-generated.

Retinal prostheses offer hope for visual restoration in blind patients, with several systems approved and more in trials. Continued innovation in engineering and biophysics aims to bridge the gap between artificial and natural vision.

Keywords:
microelectrodephotovoltaicretinal prosthesistissue electronics

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Area of Science:

  • Ophthalmology and Biomedical Engineering
  • Visual Prosthetics and Restorative Medicine

Background:

  • Significant advancements in retinal prosthesis systems over 25 years.
  • Development of novel surgical and engineering approaches for visual restoration.
  • Established safety profile for chronic implantation of retinal devices.

Purpose of the Study:

  • To review current retinal prosthetic systems in development and clinical trials.
  • To address future challenges in artificial vision and visual restorative medicine.
  • To explore strategies for improving functional outcomes in ultra-low vision.

Main Methods:

  • Review of preclinical and clinical evaluations of retinal prosthesis systems.
  • Analysis of current engineering and biophysical obstacles in artificial vision.
  • Exploration of emerging technologies like enhanced image processing and nanofabrication.

Main Results:

  • Partial visual restoration demonstrated with improvements in objective function and daily tasks.
  • Four retinal prosthesis systems have received marketing approval in Europe/US.
  • Numerous systems are undergoing evaluation, reflecting a positive safety profile.

Conclusions:

  • Retinal prosthetics offer tangible hope for blind patients, marking a new era in visual restorative medicine.
  • Overcoming engineering and biophysical challenges is crucial to match natural vision.
  • Future innovations in hardware, software, and assessment methods will drive the field forward.