Accidental channeling

FIGURE 7.25 A high performance n channel MOSFET. The device is isolated from its neighbors by a surrounding thick field oxide under which is a heavily doped channel stop implant intended to suppress accidental channel formation that could couple the device to its neighbors. The drain contacts are placed over the field oxide to reduce the capacitance to the body, a parasitic that slows response times. These structural details are described later. Source After Brews, J.R. 1990. The submicron MOSFET. In High-Speed Semiconductor Devices, ed. S.M. Sze, pp. 139 210. Wiley, New York.)... 

A center void probably occurs because small wall and bed voids link up under pressure changes and shock to form a channel. The channel is a path of least resistance and diverts the flow from the bed. This effectively removes this part of the column from the separation and gives a shorter column and shorter retention times. Eventually, the whole column is channeled and you have a center void the length of the column. If you have ever run a gravity-fed, packed glass column, you have probably seen this channeling phenomena if you accidentally let the column run dry. 

DMA transfers are made using a predefined DMA channel. The PC supports up to eight DMA channels, although not all are compatible with all expansion cards. Each channel is dedicated to a specific device— no DMA channel can be used by more than one device. If you accidentally choose a DMA channel that another card is using, the usual symptom is that no DMA transfers will take place (in other words, for our example, no sound would play). 

An application is under development in which a second detector channel is used to provide additional information, along the lines of using both a belt and suspenders, to ensure that even small amounts of the wrong peak do not get accidentally put into the fraction of interest. 

The previous situation would imply that for a chemical conversion to occur between species having the same parity in the reactant and product channels, a quantum state having appropriate parity is necessary to mediate the chemical process. Such a state is dubbed as a quantum transition state (QTS). This is a new result transition states are not accidental but they appear to be a quantum mechanical necessity. 

Local anaesthetics prevent nerve transmission by blocking sodium ion channels from the inside of the neuron. Sensory nerves that carry the stimulus of pain are the most sensitive to the actions of local anaesthetics. Accidental overdose can cause systemic effects including cardiorespiratory depression and loss of consciousness. Lidocaine is probably the most commonly used local anaesthetic. Qualified, registered podiatrists are allowed to access and administer lidocaine, bupivacaine, prilocaine, mepivacaine, levobupivacaine and ropivacaine. 

Consider a single pulse in channel 1. If a pulse occurs in channel 2 within the time period t, then a coincidence will be registered. Since the number of pulses in channel 2 during time r is TjT, the rate of accidental coincidences is... 

---