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The document defines several key terms related to chemical engineering processes including: - Absorption, which is a mass transfer process where gases are transferred into a liquid or solid solvent. It is a common separation method for low molecular weight materials. - Adsorption, which is a process where components in gases, liquids, or dissolved substances are selectively held on the surface of a solid. - Aerosol, which is a dispersion of fine droplets of liquid or particles of solid within a gas such as air, with particles that are often very small and colloidal in size.
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TIME DIVISION MULTIPLEXING TECHNIQUE FOR COMMUNICATION SYSTEM
Time Division Multiplexing (TDM) is a method of transmitting multiple signals over a single communication channel by dividing the signal into many segments, each having a very short duration of time. These time slots are then allocated to different data streams, allowing multiple signals to share the same transmission medium efficiently. TDM is widely used in telecommunications and data communication systems.
### How TDM Works
1. **Time Slots Allocation**: The core principle of TDM is to assign distinct time slots to each signal. During each time slot, the respective signal is transmitted, and then the process repeats cyclically. For example, if there are four signals to be transmitted, the TDM cycle will divide time into four slots, each assigned to one signal.
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### Types of TDM
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2. **Asynchronous TDM (or Statistical TDM)**: Asynchronous TDM addresses the inefficiencies of synchronous TDM by allocating time slots dynamically based on the presence of data. Time slots are assigned only when there is data to transmit, which optimizes the use of the communication channel.
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- **Telecommunications**: TDM is extensively used in telecommunication systems, such as in T1 and E1 lines, where multiple telephone calls are transmitted over a single line by assigning each call to a specific time slot.
- **Digital Audio and Video Broadcasting**: TDM is used in broadcasting systems to transmit multiple audio or video streams over a single channel, ensuring efficient use of bandwidth.
- **Computer Networks**: TDM is used in network protocols and systems to manage the transmission of data from multiple sources over a single network medium.
### Advantages of TDM
- **Efficient Use of Bandwidth**: TDM all
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Important defination
- 1. ABDUL MONNAF MOHON Process Engineer Samuda ChemicalComplex,ltd Chittagong, Bangladesh
- 2. Ablation The removal of material by erosion ,evaporation or chemical reaction. Absolute error The difference between a measured value and its true value Accuracy A measure of the closeness or agreement of a numerical value to a true value.
- 3. Absolute humidity The amount of water in air expressed as the mass of water vapour per unit mass of dry air for a particular temperature and pressure condition. The SI units are kg water kg air –1 . Absorption A mass transfer process in which one or more gases in a gaseous mixture is transferred into a liquid solvent or a solid. It is the most common form of separation of low molecular weight materials.
- 4. Acentric factor A parameter used in equations of state to estimate physical and thermodynamic properties. Acid egg An egg-shaped vessel used to transport highly corrosive acids. Acid number A measure of the acidity of oils such as crude oil, mineral oils, and biodiesels.
- 5. Additive A substance added in a small amount to another or mixture to improve the performance or properties in some way. Adsorbate A substance that is adsorbed from a gas or liquid onto a solid surface or adsorbent during an adsorption process. Adiabatic A thermodynamic process that takes place without heat transfer to or from an external source.
- 6. adsorption A process in which components in gases, liquids, or dissolved substances are selectively held on the surface of a solid. advection The natural movement of a fluid such as air resulting in horizontal motion caused by local pressure differences. aerosol A dispersion of fine droplets of liquid or particles of solid within a gas such as air. The particles are often very small and colloidal in size.