[x]
Create

Here is what users have to say about Backscatter

useravatar
Entry added by CWAnswers Join us and contribute your knowledge as well.
Comment
Share this
Share with a friend: backscatter
Your name
Your email
Recipient Email

Backscatter is the reflection of waves, particles, or signals back to the direction they came from. The term is used in astronomy and several fields of physics, as well as in photography and medical ultrasonography.

Welcome to CWAnswers

CWAnswers is your guide to the sprawling world wide web. The directory aims to provide a useful guide made by users. You can share your knowledge as well - simply sign up and edit your first entry. For questions just contact the team at support - at - cwanswers.com.

Weblinks for Backscatter

Top 10 for Backscatter

Things about Backscatter you find nowhere else.

Select content modules

Comments about Backscatter

Please leave your comment using the comment button above the article
Share with a friend: backscatter
Your name
Your email
Recipient Email

Images found for Backscatter

Backscatter 1Backscatter 2Backscatter 3
Backscatter 4Backscatter 5Backscatter 6
Backscatter 7Backscatter 8Backscatter 9

Blogs for Backscatter

How to Stop Email Backscatter

Resources " rackaid blog " rackTIPS " How to Stop Email Backscatter. rackAID Blog ... rackAID Blog: rackTIPS. How to Stop Email Backscatter. April 28, 2008 10: ...www.rackaid.com/resources/rackaid-blog/racktips/bounced_emai...

Backscatter — Blogs, Pictures, and more on WordPress

... ago: As reported by e-Week in this article called Backscatter Spam is Back. ... Bounced Email or Backscatter ... Google spam backscatter ...en.wordpress.com/tag/backscatter/

Terry Zink's Anti-spam Blog

A blog about fighting spam by a member of Microsoft Exchange Hosted Services anti-spam team ... Backscatter spam is annoying. ...blogs.msdn.com/tzink/archive/tags/Backscatter/default.aspx

Al Iverson's Spam Resource: Backscatter: What is it? How do I stop it?

Backscatter is a certain kind of mail you receive that you didn't ask to receive. ... Justin Mason's blog covers this topic, as well. ...www.spamresource.com/2007/02/backscatter-what-is-it-how-do-i...

backscatter | centre{source} interactive agency blog

Nick highlighted some of the disadvantages of E-mail handshaking as a spam ... Pingback by CentreSource: Blog " sober.p/q spam backscatter. May 16, 2005 @ 2:43 pm ...blog.centresource.com/2005/05/03/backscatter/

Wikipedia About Backscatter

Backscatter is the reflection of waves, particles, or signals back to the direction they came from. The term is used in astronomy and several fields of physics, as well as in photography and medical ultrasonography.

Backscatter of waves in physical space

Backscattering occurs in quite different physical situations. The incoming waves or particles can be deflected from their original direction by quite different mechanisms:

  • Rayleigh scattering of electromagnetic waves from small particles, diffuse reflection from large particles, or Mie scattering in the intermediate case, causing alpenglow and gegenschein, and showing up in weather radar;
  • inelastic collisions between electromagnetic waves and the transmitting medium (Brillouin scattering and Raman scattering, important in fiber optics, see below;
  • elastic collisions between accelerated ions and a sample (Rutherford backscattering)
  • Bragg diffraction from crystals, used in inelastic scattering experiments (neutron backscattering, X-ray backscattering spectroscopy);
  • Compton scattering, used in Backscatter X-ray imaging.

Sometimes, the scattering is more or less isotropic, i. e. the incoming particles are scattered randomly in various directions, with no particular preference for backward scattering. In these cases, the term "backscattering" just designates the detector location chosen for some practical reasons:

  • in X-ray imaging, backscattering means just the opposite of transmission imaging;
  • in optical fibers, light can only propagate forward or backward. Forward Brillouin or Raman scattering would violate momentum conservation, so inelastic scattering in optical fibers cannot be anything else but backscattering;
  • in inelastic neutron or X-ray spectroscopy, backscattering geometry is chosen because it optimizes the energy resolution;
  • in astronomy, backscattered light is that which is reflected with a phase angle of less than 90°.

In other cases, the scattering intensity is enhanced in backward direction. This can have different reasons:

  • In alpenglow, red light prevails because the blue part of the spectrum is depleted by Rayleigh scattering;
  • in gegenschein, constructive interference might play a role (this needs verification);
  • in multiple scattering from suspensions like milk, the enhancement of backscattering is connected with weak localization.

Radar, especially weather radar

Backscattering is the principle behind radar systems.

In weather radar, backscattering is proportional to the 6th power of the diameter of the target multiplied by its inherent reflective properties. Water is almost 4 times more reflective than ice but droplets are much smaller than snow flakes or hail stones. So the backscattering is dependent on a mix of these two factors. The strongest backscatter comes from hail and large graupel (solid ice) due to their sizes. Another strong return is from melting snow or wet sleet, as they combine size and water reflectivity. They often show up as much higher rates of precipitation than actually occurring in what is called a brightband. Rain is a moderate backscatter, being stronger with large drops (such as from a thunderstorm) and much weaker with small droplets (such as mist or drizzle). Snow has rather weak backscatter.

Search results for Backscatter

backscatter: Definition from Answers.com

backscatter n. The deflection of radiation or particles by electromagnetic or nuclear forces through angles greater than 90° to the initialwww.answers.com/topic/backscatter

Spam Links - backscatter

Spam Links, the anti-spam portal; everything you didn't want to have to know about spam. ... Email backscatter victims unite - backscattervictims.blogspot.com ...spamlinks.net/prevent-secure-backscatter.htm

Al Iverson's Spam Resource: Backscatter: What is it? How do I stop it?

Backscatter is a certain kind of mail you receive that you didn't ask to receive. ... The backscatter problem is inherently linked to the spam problem, as most ...www.spamresource.com/2007/02/backscatter-what-is-it-how-do-i...

HF Backscatter off Travelling Ionospheric Disturbances Identified with ...

Dynamics of Shortwave Backscatter Observed with Pactor-II ... Communications-capable backscatter events measured from Tennessee (36°N, 87°W, ...ecjones.org/backscatter.html

Eland Systems Scam-backscatter

Eland Systems Scam-archiver milter ... Scam-backscatter was designed to use minimal resources. ... server can prevent backscatter by validating the recipient ...www.elandsys.com/scam/scam-backscatter/

Images found for Backscatter

Backscatter 1Backscatter 2Backscatter 3
Backscatter 4Backscatter 5Backscatter 6
Backscatter 7Backscatter 8Backscatter 9

News about Backscatter

AS&E scanner maintenance contract renewed

UPIBILLERICA, Mass., May 6 (UPI) -- The U.S. government has renewed a contract with American Science and Engineering Inc. to provide maintenance services for its mobile X-ray screening system.http://www.upi.com/Security_Industry/2009/05/06/ASE-scanner-...

American Science and Engineering, Inc. Receives $2.3 Million Service and Maintenance Renewal Order from the U.S. ...

Business Wire via Yahoo! FinanceBILLERICA, Mass.----American Science and Engineering, Inc. , a leading worldwide supplier of innovative X-ray detection solutions, announced today the receipt of a $2.3 million service and maintenance renewal order from the U.S. government for Z Backscatter Vans -- the industry's top-selling mobile X-ray screening system.http://biz.yahoo.com/bw/090505/20090505005192.html?.v=1

American Science and Engineering, Inc. Receives $4.7 Million Contract for Multiple ZBVs for use by Law Enforcement ...

Business Wire via Yahoo! FinanceBILLERICA, Mass.----American Science and Engineering, Inc. , a leading worldwide supplier of innovative X-ray detection solutions, announced today the receipt of a $4.7 million contract for multiple Z Backscatter Vans™ equipped with Forwardscatter® technology.http://biz.yahoo.com/bw/090504/20090504005170.html?.v=1

American Science and Engineering, Inc. Announces Notice of Q4 and Fiscal Year 2009 Results

Business Wire via Yahoo! FinanceBILLERICA, Mass.----American Science and Engineering, Inc. will announce its fourth quarter and fiscal year 2009 results on Wednesday, May 13, 2009 after the market closes. A copy of the full press release will be issued via e-mail, fax and/or Business Wire.http://biz.yahoo.com/bw/090505/20090505006503.html?.v=1

News about Backscatter

AS&E pulls in $6.3M more for Z Portal bomb-finding systems

Mass High TechThe Z Portal is a drive-through gantry system based on the company Z Backscatter X-ray technology. In addition to the Z Portal, AS&E applies the Z Backscatter technology to standard cargo vans to use as drive-by detection systems and to tractor ... http://www.masshightech.com/stories/2009/03/30/daily41-ASE-p...

Airport Security Gets Personal

CBS NewsThe new backscatter X-ray machine will debut at the Phoenix airport on Friday. It reportedly has privacy filters to protect passenger privacy and make air travel safer. Bob Orr looks into the matter. Flash Player is required to view video on CBSNews ... http://www.cbsnews.com/video/watch/?id=2506531n

IVS 3D Announces Free FM Geocoder Upgrade with Upcoming Release

PR.comFM Geocoder provides the very latest in multibeam backscatter processing and analysis. The software originated from research at the Center for Coastal & Ocean Mapping at the University of New Hampshire, and has been integrated into the Fledermaus ... http://www.pr.com/press-release/147807

New Women's Imaging Technique Allows For A More Accurate Diagnosis Of ...

Medical News TodayBreast elastography is a new technique which looks at the mechanical properties of tissues (relative stiffness) as opposed to conventional ultrasound which looks at the backscatter of transmitted ultrasound waves through tissues. Ninety-nine women ... http://www.medicalnewstoday.com/articles/147391.php

Site has airline passengers worried about privacy

ksl.com...for REAL men to object. I do not mind, at all, security that materially improves the safety of the airplane. But we crossed that threshold long ago. One idiot hides something in his shoe and we now all walk around in our stockings on filthy floors ... http://www.ksl.com/?nid=148&sid=6017908&comments=true

Search results for Backscatter

Backscatterer.org powered by UCEPROTECT

... spamtrap email addresses, the resulting NDR from your server would hit our spamtrap causing your IP address to be blacklisted here, because your system sends backscatter ... http://www.backscatterer.org/?target=backscatter

Al Iverson's Spam Resource: Backscatter: What is it? How do I stop it?

What is it? Backscatter is a certain kind of mail you receive that you didn't ask to receive. If you've ever received a “Your mail could not be delivered” bounce notification ... http://www.spamresource.com/2007/02/backscatter-what-is-it-h...

TSA | Transportation Security Administration

Transportation Security Administration (TSA) protects the nation's transportation systems to ensure freedom of movement for people and commerce. TSA's regulations, restrictions ... http://www.tsa.gov/research/privacy/backscatter.shtm

TSA: Backscatter

Transportation Security Administration (TSA) protects the nation's transportation systems to ensure freedom of movement for people and commerce. TSA's regulations, restrictions ... http://www.tsa.gov/approach/tech/bscatter.shtm

Postfix Backscatter Howto

Overview . This document describes features that require Postfix version 2.0 or later. Topics covered in this document: What is backscatter mail?http://www.postfix.org/BACKSCATTER_README.html

Wikipedia results for Backscatter

Backscatter - Wikipedia, the free encyclopedia

Backscatter is the reflection of waves, particles, or signals back to the direction they came from. The term is used in astronomy and several fields of physics, as well as in ... http://en.wikipedia.org/wiki/Backscatter

Backscatter X-ray - Wikipedia, the free encyclopedia

In contrast to the traditional X-ray machine, which detects hard and soft materials by the variation in transmission through the target, backscatter X-ray is a newer imaging system ... http://en.wikipedia.org/wiki/Backscatter_X-ray

Backscatter (e-mail) - Wikipedia, the free encyclopedia

Backscatter (also known as outscatter, misdirected bounces, blowback or collateral spam) is a side-effect of e-mail spam, viruses and worms, where email servers receiving spam and ... http://en.wikipedia.org/wiki/Outscatter

Denial-of-service attack - Wikipedia, the free encyclopedia

... switch with integrated denial-of-service throttling was tested by Network Test and the resulting review was published in Network World. Side effects of DoS attacks Backscatterhttp://en.wikipedia.org/wiki/Backscatter_%28DDOS%29

Electron backscatter diffraction - Wikipedia, the free encyclopedia

Electron backscattered diffraction (EBSD), also known as backscattered Kikuchi diffraction (BKD) is a microstructural-crystallographic technique used to examine the ... http://en.wikipedia.org/wiki/EBSD
  • Recent
  • Mine
  • Watched
  • Commented
You must be logged in to perform this operation
You must be logged in to perform this operation

Search this site

Videos found for Backscatter

'Backscatter' X-Ray Debuts In Phoen...

'Backscatter' X-Ray Debuts In PhoenixA controversial new X-ray machine for detecting weapons and explosives on airline passengers is up and running in Arizona.Video - Video

Cool Technology -- Backscatter Vide...

Cool Technology -- Backscatter Video Footage from TSAActual backscatter video footage from TSA. Images are exactly what Transportation Security Officers see.Flash - Video

Boon for Backscatter

Boon for BackscatterA look at new technology that allows scanners to see concealed items, with Margaret Brennan, Reporter, CNBC Business NewsWindows Media - Video

Numb3rs, "Backscatter"

Numb3rs, An FBI investigation into a computer hacking scam, which taps into a bank's system to gain access to customer identities and financial assets, becomes personal for Don when the...Flash - Video

'Backscatter' X-Ray Debuts In Phoen...

'Backscatter' X-Ray Debuts In PhoenixA controversial new X-ray machine for detecting weapons and explosives on airline passengers is up and running in Arizona.Video - Video

Answers for Backscatter

Paul WDescribe the difference between inductive coupling and backscatter?Paul WInductive coupling only happens in an RF 'near' field. Backscatter happens in an RF 'far' field, where the standard formulas for E and H-fields' point-sources and line-sources reduce to (are approxim...iwuvrockandrollWhere can I find out which airports have backscatter machines?iwuvrockandrollCKS,Narita,Kimpo,Changi, well most should have these exray machines, Schipholroyharleyboy1What are some possible harmful effects from backscatter x-ray technology, the kind being purposed in airports?royharleyboy1i think that long-time exposer to X-rays is very bad for you. i think that when a cell is struck by an X-ray it is damaged, hence the lead aprons when you get an X-ray. i think that it would hurt peop...Shoshanna Says What was that song in the NUMB3RS episode Backscatter?Shoshanna Says "Hi!"Try here: http://heardontv.com/iwuvrockandrollWhich airports are using the backscatter (body xray) machines?iwuvrockandrollLos Angeles, Baltimore, Denver, Albuquerque, and New York Kennedy now have the body scanners. Dallas, Detroit, Las Vegas and Miami body scanners will be added this month. I would expect to see a l...
Contact Us[X]
Your name
Email
Subject
Your comment
[X]