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BW

(ordnance)

butt joint

welded butt joint
butt joint formed by two boards
1. A plain, square joint between two members, where the contact surfaces are cut at right angles to the faces of the pieces; the two pieces are fitted squarely against each other rather than lapped; Also see oblique butt joint.
2.

bw

(networking)
The country code for Botswana.

bandwidth

(1) Computer people may use the term for capability and time. For example, "not enough bandwidth to get the job done" means not enough staff or time to do it. Its true meaning follows.

(2) The transmission capacity of an electronic pathway such as a communications line, computer bus or computer channel. Digital bandwidth is the number of pulses per second measured in bits per second (bps). For example, Ethernet transmits at different speeds, including 10 Mbps, 100 Mbps and 1000 Mbps (see Mbps and baseband).

When transmitting alternating frequencies, as with all wired analog, many wired digital and most wireless communications, the bandwidth is the difference between the highest and lowest frequencies, measured in cycles per second, or Hertz (Hz). For example, 802.11n Wi-Fi transmits in 20 MHz and 40 MHz channels within the 2.4 GHz and 5 GHz bands. The 20 and 40 MHz channel frequencies are the bandwidths, and each channel is divided into subchannels.

From Hertz to Bits - A Complicated Process
When using alternating frequencies for digital transmission, the frequencies are modified (modulated) by the digital input. Using the 802.11n Wi-Fi example, the resulting bit rate can range from 6.5 Mbps to 600 Mbps. This extremely wide range is determined by the signal strength and interference in the environment at any given moment. Any one of more than 30 combinations of channel bandwidth (20, 40 MHz), modulation scheme, error correction rate, channel spacing and number of antennas may be selected, on a packet-by-packet basis. See modulation, video bandwidth, space/time and bandwidth junkie.


Bandwidth in Hertz to Bandwidth in Bits
This quadrature PSK (QPSK) example is one of the simplest modulation schemes. Each set of two input bits modifies the carrier into four phase angles. The amplitude remains constant, unlike QAM modulation, in which the amplitude is varied (see QAM).











References in periodicals archive ?
To determine whether V[O.sub.2] differed significantly across the three test runs, linear mixed model regression analyses were used, comparing V[O.sub.2] across all four velocities and three levels of BWS (40%, 20% and regular treadmill).
Rating of Perceived Exertion (6-20 scale) and Heart Rate (HR) increased with velocity and was higher with less BWS. RPE ranged from 7.33 (SD = 1.03) at 60% body weight and 8 minute x [mile.sup.-1] to 16.83 (SD = 1.47) on the regular treadmill at 5 minute x [mile.sup.-1] pace.
There was also a main effect of BWS, F(df=2) = 220.02, p < 0.001, showing that V[O.sub.2] decreased with each increase in BWS.
Our data agrees with previous descriptions of "normal" patterns of muscle activation during walking with 0 percent BWS [9-10].
[8], increasing BWS decreased muscular demand of the lower limbs during the walking trials, thereby decreasing the intensity of the task.
In this study, the nonsignificant change in BF activity may have been a result of large between-subject variability at the highest level of BWS, possibly because of subjects resisting the vertical support from the ZeroG training system in an attempt to maintain "normal" gait kinematics.
Richards o Bwllpeirian, dyma holi pam fod y bws mor ddefnyddiol iddi hi, ``Does 'na ddim ffwdan ynglyn a pharcio ac mae'r bws yn fy nghodi a ngostwng i reit tu allan i'r ty.'' Ac wrth i ni agosau at Bontarfynach mae tair arall yn sefyll ger Swyddfa'r Post yn barod am drip i'r dre'.
UCHOD: Bws y Pout yn mynd trwy'r bwa hynafol ger Pontarfynach; UCHOD: Donald Davies wrth ymyl y bws; mwynhau paned a sgwrs efo Blod Griffiths yn Ysgubor Fach; Donald a theithwyr Bws y Post, isod, Donald yn mwynhau joc gyda chwsmer ger Cwmystwyth; teithwyr Bws y Post yn cyrraedd swyddfa ddidoli Aberystwyth; www.postbus.royalmail.com n
BWS as part of the Dubai World global conglomerate delivers enormous value with their range of cost effective solutions.
What are the strengths BWS brings to the marine insurance sector in the Middle East?