Some 45 frequencies are assigned for use primarily by dominant Class 1, -- A or Class 1, -- B clear-channel stations, designed to operate with adequate power and to provide service -- both groundwave and ( at night ) skywave -- over large areas and at great distances, being protected against interference to the degree necessary to achieve this objective.

Some people even wrote code to vibrate the head at different frequencies to play simple tunes.

Some club DJs use a subharmonic synthesizer effect which either doubles low frequencies with energy added an octave lower or synthesizes harmonics such that the impression of a very low bass sound is added to the mix.

Some players use the more nimble tips of the fingers to play fast-moving solo passages or to pluck lightly for quiet tunes. The use of amplification allows the player to have more control over the tone of the instrument, because amplifiers have equalization controls that allow the bassist to accentuate certain frequencies ( often the bass frequencies ) while de-accentuating some frequencies ( often the high frequencies, so that there is less finger noise ).

Some earlier WLAN technologies used lower frequencies, such as the U. S. 900 MHz ISM band.

Some microcontrollers may use four-bit words and operate at clock rate frequencies as low as 4 kHz, for low power consumption ( milliwatts or microwatts ).

Some carriers such as T-Mobile use band numbers to identify the UMTS frequencies.

Some systems have multiple, distinct, resonant frequencies.

Some biologists have criticised the idea for describing the gene as the unit of selection, but suggest describing the gene as the unit of evolution, on the grounds that selection is a " here and now " event of reproduction and survival, while evolution is the long-term trend of shifting allele frequencies.

Some also include user-adjustable equalization that allows boosted or reduced output at particular frequencies ; these vary from a simple " boost " switch, to fully parametric equalizers meant for detailed speaker and room correction.

Some frequencies in this radio band are used for vehicle speed detection by law enforcement, especially in Europe.

Some hobbyists continue to use the designation " 11 meters " to refer to the Citizens ' Band and adjoining frequencies.

Some member countries permit additional modes and frequencies ; for example, Germany has 40 additional channels at 26 MHz for a total of 80.

Some musical genres – particularly country, oldies, nostalgia and ethnic / world music – survive on AM, especially in areas where FM frequencies are in short supply or in thinly populated or mountainous areas where FM coverage is poor.

Some radio frequencies are absorbed and others are reflected, leading to rapidly fluctuating signals and unexpected propagation paths.

Some stations, for instance Droitwich in the UK, derive their carrier frequencies from an atomic clock.

Some stations have frequencies unshared with other stations in North America ; these are called clear-channel stations.

Some modes of communication, such as continuous wave morse code transmissions ( especially by amateur radio operators ) and single sideband voice transmissions are more common in the HF range than on other frequencies, because of their bandwidth-conserving nature, but broadband modes, such as TV transmissions, are generally prohibited by HF's relatively small chunk of electromagnetic spectrum space.

Some confusion about the use of " radio waves " results when these devices are used at conventional RF frequencies, as they are in an MRI scanner.

Some parabolic antennas transmit or receive at multiple frequencies by having several feed antennas mounted at the focal point, close together.

Some non-Bell system party lines in the US used multiple frequencies ( 20 / 30 / 40Hz, 22 / 33 / 44 Hz, etc.

Some seismometers can measure motions with frequencies from 500 Hz to 0. 00118 Hz ( 1 / 500

Some marine oligochaeta ( e. g. Olavius or Inanidrillus ) have obligate extracellular endosymbionts that fill the entire body of their host.

Some proteins, such as insulin, are extracellular proteins that transmit a signal from the cell in which they were synthesized to other cells in distant tissues.

Some organisms, including nearly all spiders, simply secrete biotoxins and digestive chemicals ( e. g., enzymes ) into the extracellular environment prior to ingestion of the consequent " soup ".

Some structures resembling the mineralized casts of terrestrial bacteria and their appendages ( fibrils ) or by-products ( extracellular polymeric substances ) occur in the rims of carbonate globules and preterrestrial aqueous alteration regions.

Some sources, therefore, distinguish " extracellular thirst " from " intracellular thirst ", where extracellular thirst is thirst generated by decreased volume and intracellular thirst is thirst generated by increased osmolite concentration.

Some members of this family are activated by voltage, while others are activated by Ca < sup > 2 +</ sup >, extracellular ligands, and pH among other modulators.

Some plants can take up silica in the soil, whereupon it is deposited within different intracellular and extracellular structures of the plant.

Some common examples are the high electrical conductivity of pure copper, the excellent deep drawing qualities of cartridge case brass, the low-friction properties of bearing bronze, the resonant qualities of bell bronze, and the resistance to corrosion by sea water of several bronze alloys.

Some early digital computers used an electrical model of the common decimal ( base ten ) numeral system to represent numbers internally.

Some of the oldest such data is the Bereitschaftspotential or " readiness potential " in which electrical activity related to voluntary actions can be recorded up to two seconds before the subject is aware of making a decision to perform the action.

Some electrical engineers choose to pursue a postgraduate degree such as a Master of Engineering / Master of Science ( M. Eng ./ M. Sc.

Some aircraft, the Panavia Tornado for example, retain a very basic hydro-mechanical backup system for limited flight control capability on losing electrical power, in the case of the Tornado this allows rudimentary control of the stabilators only for pitch and roll axis movements.

Some high-intensity discharge ( HID ) lamps couple their even-greater electrical efficiency with phosphor enhancement for better color rendition.

Some strategies used for treatment include promoting the use of the hemiparetic limb during functional tasks, maintaining range of motion, and using neuromuscular electrical stimulation to decrease spasticity and increase awareness of the limb.

Some designs of these scatterable mines require an electrical charge ( capacitor or battery ) to detonate.

* Some patients have sustained electrical burns unseen by surgeons who are working with electrodes that leak current into surrounding tissue.

Some neurons also communicate via electrical synapses, which are direct, electrically-conductive junctions between cells.

Some neurons do not generate action potentials, but instead generate a graded electrical signal, which in turn causes graded neurotransmitter release.

Some neurons do, however, communicate via electrical synapses through the use of gap junctions, which allow specific ions to pass directly from one cell to another.

Some areas of the world such as Washington and Oregon in the United States, and Wales in the United Kingdom, have used geographic features to store large quantities of water in elevated reservoirs, using excess electricity at times of low demand to pump water up to the reservoirs, then letting the water pass through turbine generators to retrieve the energy when electrical demands peak.

Some master smiths go as far as to use techniques such as electrical discharge machining to cut interlocking patterns out of different steels, fit them together, then weld the resulting assembly into a solid block of steel.

Some electrical and electronic products use silver for its superior conductivity, even when tarnished.

Some designs might contain a radioisotope thermoelectric generator using Pu-238 to provide a long lasting source of electrical power for the electronics in the device.

Some hazardous waste types may be eliminated using pyrolysis in an ultra high temperature electrical arc, in inert conditions to avoid combustion.

Some electrical multiplexing techniques do not require a physical " multiplexer " device, they refer to a " keyboard matrix " or " Charlieplexing " design style:

Some newer flash memory, known as multi-level cell ( MLC ) devices, including triple-level cell ( TLC ) devices, can store more than one bit per cell by choosing between multiple levels of electrical charge to apply to the floating gates of its cells.

Some applications use shellac mixed with other natural or synthetic resins, such as pine resin or phenol-formaldehyde resin, of which Bakelite is the best known, for electrical use.

Some of the precipitated water becomes groundwater, and groundwater flow includes phenomena such as percolation, while the conductivity of water makes electrical and electromagnetic methods useful for tracking groundwater flow.

Some APU designs use a combination starter / generator for APU starting and electrical power generation to reduce complexity.

Some signaling schemes do not use electrical wires.

Some recent projects being developed at the university include Flame, first humanoid robot possessing the ability to walk as humans, Superbus, project aiming to design a high speed busses reaching the speeds of 250 km / h, Nuna, solar-powered race car and four times winner of the World Solar Challenge, DUT Racing, electrical Formula Student project having won multiple competitions, Delfly, Micro air vehicle and the smallest ornithopter so far fitted with a camera, Fhybrid, world's first hydrogen-powered scooter, Tribler, an open source peer-to-peer client with online TV functionalities, Delfi-C3, CubeSat satellite constructed by TU Delft students, Forze, hydrogen fuel cell-powered racing car, as well as Eco-Runner vehicle participating in Eco-marathon.

Some slots use open-ended sockets to permit physically longer cards and negotiate the best available electrical connection.