Related Concept Videos
01:21Carrier Transport
1.2K
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
1.2K
01:06Carrier-Mediated Transport
1.6K
Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
1.6K
02:12Short-distance Transport of Resources
18.1K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
18.1K
01:29Electrical Transport
147
The electrical transport property of a material is defined by its resistance and conductivity. Resistance is the measure of a material's ability to resist the flow of electric current, while conductivity gauges its ability to allow the current to pass through, depending on the geometry of the measurement cell, such as electrode spacing and area. Conductivity is measured in Siemens (S). There are different types of conductance, including specific conductance, equivalent conductance, and molar...
147
01:31Transport Number
168
The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
168
You might also read
Related Articles
Articles linked to this work by shared authors, journal, and citation graph.
Sort by
Same author
Ambient temperature and sunshine hours are not associated with type 1 diabetes incidence in subtropical Taiwan: a nationwide time-series analysis.
Clinics (Sao Paulo, Brazil)·2026
Same author
AI-derived bone mineral density from standard radiographs compared with DXA for fracture prediction in a 10-year real-world cohort study.
Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA·2026
Related Experiment Video
Updated: Apr 7, 2026
07:45
Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
11.4K
20-Gbps optical LiFi transport system.
Optics Letters
|July 16, 2015
Summary
A novel optical light-based WiFi (LiFi) system achieves 20 Gbps using a vertical-cavity surface-emitting laser and advanced modulation. This high-speed free-space communication accelerates visible laser light communication deployment.
Area of Science:
- Optical Communications
- Wireless Networking
Background:
- Light-based WiFi (LiFi) offers high-speed wireless communication potential.
- Existing LiFi systems face challenges in achieving multi-gigabit data rates over free-space links.
Purpose of the Study:
- To propose and demonstrate a 20-Gbps optical LiFi transport system.
- To achieve high data rates using advanced modulation techniques in a free-space LiFi setup.
Main Methods:
- Employed a vertical-cavity surface-emitting laser (VCSEL) with external light injection.
- Utilized 16-quadrature amplitude modulation (QAM)-orthogonal frequency-division multiplexing (OFDM) for signal modulation.
- Demonstrated the system over a 6-meter free-space link.
Main Results:
- Achieved a data rate of 20 Gbps.
- Obtained good bit error rate (BER) performance.
- Displayed clear constellation maps, indicating signal integrity.
Conclusions:
- Successfully demonstrated a 20-Gbps optical LiFi transport system.
- The system leverages VCSELs and advanced modulation for high-speed free-space communication.
- This technology can accelerate the deployment of visible laser light communication (VLLC).