In particle physics, the tracking is the act of measuring the direction and magnitude of charged particlesmomenta. The particles entering a tracker (the device used for tracking), release part of their energy in the device: the tracker has to be finely segmented in order to be able to reconstruct with good precision where the particle passed. Since the tracking is usually made in a region where a magnetic field is present, it is possible to reconstruct part of the helix made by the particle inside the tracker (that is called track), and from the track parameters, and by knowing the mass of the particle under study (which is known by the use of particle identification), it is possible to reconstruct the actual direction and magnitude of the particle momenta. From these information the tracking of charged particles can be used to reconstruct secondary decays, this can be done for B-tagging (in experiments like CDF or at LHC) or to fully reconstruct events (like in BaBar and Belle).
Tracking, one of the first freefall skills learned by a novice skydiver, is the technique of assuming a body position that allows the skydiver to move horizontally while freefalling.
Although there are many variations of the basic body position it essentially involves the skydiver moving out of the traditional face to earth arched position, straightening the legs, bringing the arms to the sides and de-arching, using the body to cup the air as a means of providing greater lift. There is, however, debate over what exactly constitutes the most efficient tracking position (providing the best glide ratio) especially concerning how far (if at all) the skydiver's legs should be spread. Some variations of the tracking position work well for some individuals and not so well for others. Also, when a skydiver gains experience, his or her preferred body position often changes.
It is claimed that good trackers can cover nearly as much ground as the distance they fall, approaching a glide ratio of 1:1. It is known that the fall rate of a skydiver in an efficient track is significantly lower than that of one falling in a traditional face-to-earth position; the former reaching speeds as low as 90mph, the latter averaging around the 120mph mark.
... in full swing, approached minors by disguising himself as a member of the police or civilian tracking squad that first uncovered the Nth Room case ... L changed his online ID frequently, operated about 30 group chats, closing them frequently and opening new ones to avoid tracking.
China's Covid protests ... WATCH ... Read more ... WhatsApp to roll out mute shortcut for group chats ... Messaging platform WhatsApp is working a on new feature of a mute shortcut for group chats. With this, it will now be easier to disable the notifications of messages received in the group, WABetaInfo, a website which tracks updates related to the app, reported.
Irene Cara, an Oscar-winning singer who performed the electric title tracks in two aspirational self-expression movies films of the 1980s, "Flashdance" and "Fame," has died ... She performed the title track from the movie "Fame" (1980), which followed a group of artsy high school students as they move through their first auditions to graduation.
The ad tracking firm AdImpact noted that Democratic-aligned groups have pumped $25m into television ads for the runoff while Republican groups spent $16m. Notably, while other Republican allies have rallied behind Walker and as Republican groups like the SenateLeadership Fund ...
But the Saudis’ World Cup isn’t over – and you can expect their hardcore support again on Wednesday against Mexico in the last group game ... That explains Saudi fans’ passionate celebrations after the Argentina win – including a viral clip of a group dancing in joy to the 1997 dance track Freed from Desire ... “The fan groups have united,” Yasin said ... .
At a briefing in Doha, Fifa technical study group (TSG) member Sunday Oliseh said strikers are “getting smarter” ... After 20 games in this tournament, nine penalties have been awarded, which is on track to reach the previous record of 24 that were given in the group stages in Russia four years ago.
A week-long early voting period begins Saturday in some Georgia counties as Democratic Sen ...Obama leads surrogate list ... Democratic groups have spent nearly $25 million, while GOP groups have spent nearly $16 million, according to the ad tracking firm AdImpact ... The governor and McConnell's group have are also linking up for get out the vote efforts.
Since 2014, state officials, enduro groups and environmental advocates have partnered to craft a new enduro map with routes to streamline competitions in Brendan T ... The map’s design — including allowing some single-track trails — was done in consultation with various environmental groups, state officials said.
Graham Arnold's side, beaten 4-1 by France in their opener, will now face Denmark in their final group game on Wednesday, November 30, in buoyant mood as they aim to match their feat of 2006 in reaching the last 16 ... of getting out of the group stage for the first time.