pseudochannel

English

Etymology

pseudo- +‎ channel

Noun

pseudochannel (plural pseudochannels)

1. (geology) A subparallel feature consisting of a central core of undeformed strata, roughly U-shaped in cross section and cigar-shaped in plan, embedded in finer grained material.
   • 1949, Harry Clifford Granger, Robert Bruce Raup, “Stratigraphy of the Dripping Spring Quartzite, Southeastern Arizona”, in Geological Survey Bulletin, page 47:

     The best exposures of pseudochannels are at the Wilson Creek, Walnut Creek, Canyoun Creek, and Gerald Wash section localities. The features are restricted to the gray unit of the upper member and nearly all of the well-developed pseudochannels are in the gray facies and the gray sandstone.

   • 1964, Alfred Herman Chidester, Talc Resources of the United States - Issues 1167-1170, page 50:

     The large pseudochannel seen in cross section in the center of the photograph is surrounded by a multitude of smaller pseudochannels.

2. (hydraulics) One division of an actual channel into multiple theoretical channels, one per opening, to represent flow through openings into sidestreams.
   • 1958, Jacob Davidian, P.H. Carrigan, Jr., John Shen, “Flow Through Opening in Width Constrictions”, in Surface Water Supply of the United States, number 1369, page 101:

     This method requires that pseudochannel boundaries be located in the flow reach upstream from each of the openings to simulate the actual upstream boundaries of the single-opening constriction.

   • 1967, Howard F. Matthai, “Meaurement of Peak Discharge at Width Contractions by Indirect Methods”, in Techniques of Water-resources Investigations of the United States Geological Survey, page 33:

     To determine the discharge, establish in the approach channel pseudochannel boundaries which divide the flow between openings. This procedure defines a separate approach channel for each individual opening.

3. (orthophotography) One of multiple orthorectified images for a single location, each representing a different DEM (digital elevation model).
   • 2014, Nektarios Chrysoulakis, Eduardo Anselmo de Castro, Eddy J. Moors, Understanding Urban Metabolism: A Tool for Urban Planning, page 65:

     As a result, multispectral orthorectified images were created, each containing the respective DEM as a separate pseudochannel.

4. (physics) A virtual channel included in the mathematical model of electron collisions to account for excluded states when using the Matrix Effective Potential (MEP) method.
   • 1981, Devarajan Thirumalai, Effective Potential Studies of Electron-atom and Electron-molecule Collisions, page 32:

     For such potentials the imaginary part of the potential causes a loss of flux from the incident channel and plays a comparable role to the pseudochannel of the MEP.

   • 1991, Mangalam A. Nagarajan, Heavy Ion Collisions at Energies Near the Coulomb Barrier, page 214:

     In the first run, we assume unit incident flux in the pseudochannel ф₁, while in the second unit incident flux is assumed in ф₂.

   • 2013, Peter Politzer, Donald G. Truhlar, Chemical Applications of Atomic and Molecular Electrostatic Potentials, page 153:

     Thus it is not necessary to use complex potentials to mimic the loss of flux from the first electronic channel. Since the pseudochannel is supposed to mimic the total effect of all excited electronic states, the flux associated with it should be compared to the whole electronically inelastic cross section.

5. (electronics, communication) Any data channel that is introduced as a theoretical pathway that does not correspond to a physical channel.
   • 1961, IRE Transactions on Audio - Volumes 9-10, page 75:

     We may regard the signals to the three speakers as coming from three pseudochannels, having certain signal-to-crosstalk ratios. The ratios for each pseudochannel are those between the voltage, produced by a signal in the pseudochannel, across the intended speaker; and the voltages, produced by that same signal, across the other two speakers.

   • 1986, G. W. Gorsline, Computer Organization: Hardware/software, page 250:

     All data to and from primary memory in the IBM/360 model 30 are transmitted over 8-bit (plus parity) data paths including the pseudochannels.

   • 2000, George Zobrist, VLSI Design Environments, page 31:

     For the purpose of over-the-cell routing, the channel intersection graph is extended by pseudochannels.

   • 2012, Issues in Transportation Research and Application, page 300:

     A pseudochannel gain is introduced to convert cooperative transmissions to virtual direct transmissions,” researchers in South Korea report.

   • 2013, Russell Bryant, Leif Madsen, Jim Van Meggelen, Asterisk: The Definitive Guide: The Future of Telephony Is Now, page 349:

     The agents.conf file is used to define agents for queues using the agents channel. This channel is similar in nature to the other channel types in Asterisk (local, SIP, IAX2, etc.), but it is more of a pseudochannel in that it is used to connect callers to agents who have logged into the system using other types of transport channel.

   • 2017, Wayne C. Bradley, Handbook of Data Center Management:

     ENEOS can inject various stress and monitoring signals into a pseudochannel (e.g., the embedded operating channel of the SONET, the extended super frame data channel of T1 links, and the management channel of proprietary networks).

6. (chemistry) A theoretical channel representing the pathway by which a chemical agent interacts with a receptor site.
   • 1991, Emanuel Rubin, Keith W. Miller, Sheldon H. Roth, Molecular and Cellular Mechanisms of Alcohol and Anesthetics, page 569:

     […] catecholamines bind between the third and fifth membrane span of the ß adrenergic receptor and the orientation of bound agonist might be viewed as linking to sites of an internal pseudochannel in the receptor molecule ( FIGURE 1 ).

   • 2004, Canadian Journal of Chemistry, volume 82, page 616:

     […] into three-dimensional hydrogen bond frameworks featuring three-dimensional intersecting pseudochannels.