Nanosecond Optical

Strange vision issue?

for the past week or so, i've been having an optical issue. sometimes my vision goes dark for a nanosecond, with no other changes to my body whatsoever - it's like i'm blinking but i'm not, because i can feel my eyes open when it happens. i have a somewhat strong prescription probably around -3, -4. i lost my glasses a couple months ago and just recently found them, and that prescription is a little weak now. i'm wondering if that's the problem, because i've been without a visual aid for a while.

still, the mock blinking unnerves me quite a bit. i'm worried that it's going to get steadily more frequent until everything is dark all the time. but is there any rationality to this anxiety? i have an eye appointment in a week but for this week i'd like to be able to go to sleep without having to worry so much about "last sights" and the like.

thanks!
uhhh, i smoke a lot of pot? just thought of that now. like in excess. possible factor?

Is it when after you have sat down or lie down for a long time and you stand up and ur vision gets black for a few seconds?

Because if this is the cause you don't need to worry, I get this too. The cause is that your blood hasn't rushed up fast enough to your eyes because you've been sitting down for so long. You just need to eat more to replenish blood as this is usually a sign that you don't have enought blood.

Hope this helps!!

Nanosecond Pulse Techniques $116.03 No Synopsis Available

A Nanosecond to Eternity in the Twinkling of an Eye $19.45 No Synopsis Available

Nanosecond Dielectric Barrier Discharge Plasma $114.71 For some period of time the use of plasma in medicine has been limited to thermal discharges for cauterization and dissection. Nonthermal plasma, on the other hand, can have many different modes of interaction with tissue. It has been recently demonstrated that direct treatment of smooth surfaces by nonthermal dielectric barrier discharge (DBD) in air is highly effective in killing pathogens and DBD can create different sublethal and selective effects. However, a typical DBD in air can be highly nonuniform, particularly on topographically nonuniform surfaces such as in most living tissues. This creates significant limitations for use of DBDs in wound care and other biomedical applications. In this book, development of a novel nonthermal plasma system, namely nanosecondpulsed DBD, which addresses this important limitation, is presented. Nanosecondpulsed DBD is shown to be uniform in air at atmospheric pressure and much more effective in killing bacteria than conventional DBDs, particularly on topographically nonuniform surfaces. Thus, this new plasma system is potentially convenient for in vivo and hospital sterilization cases. Author: Ayan, Halim Binding Type: Paperback Number of Pages: 100 Publication Date: 2009/12/09 Language: English Dimensions: 5.98 x 9.01 x 0.23 inches

The Nanosecond Salesperson: Like the One Minute Salesperson - Only Faster $12.67 No Synopsis Available

Optical Race $15.99 Optical Race

Optical Delusions $13.49 Optical Delusions

Optical Illusion $6.99 Optical Illusion - Poster

Optical Instruments $19.99 Optical Instruments - Photographic Print

An Optical Illusion $49.99 An Optical Illusion - Giclee Print

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Optical Corded Mouse 0735HE $10.49 Optical Corded Mouse 0735HE

BLUETOOTH OPTICAL MOUSE MAC $15.99 BLUETOOTH OPTICAL MOUSE MAC

OPTICAL DESKTOP USB MOUSE $13.99 OPTICAL DESKTOP USB MOUSE

capturred by the nanosecond

Computers, Communications, Atomic Clocks and the NTP Server

Time synchronisation on computer networks is often conducted by the NTP server. NTP time servers do not generate any timing information themselves but are merely methods of communicating with an atomic clock.

The precision of an atomic clock is widely talked about. Many of them can maintain time to nanosecond precision (billionths of a second) which means they won't drift beyond a second in accuracy in hundreds of millions of years.

However, what is less understood and talked about is why we need to have such accurate clocks, after-all the traditional methods of keeping time such as mechanical clocks, electronic watches and using the rotation of the Earth to keep track of the days has proved reliable for thousands of years.

However, the development of digital technology over recent years has been nearly solely reliant on the ultra high precision of an atomic clock. One of the most widely used applications for atomic clocks is in the communications industry.

For several years now telephone calls taken in most industrialized countries are now transmitted digitally. However, most telephone wires are simply copper cables (although many telephone companies are now investing in fibre optics) which can only transmit one packet of information at a time. Yet telephone wires have to carry many conversations down the same wires at the same time.

This is achieved by computers at the exchanges switching from one conversation to another thousands of times every second and all this has to be controlled by nano-second precision otherwise the calls will become out of step and get jumbled - hence the need for. Atomic clocks; mobile phones, digital TV and Internet communications use similar technology.

The accuracy of atomic clocks is also the basis for satellite navigation such as GPS (global positioning system). GPS satellites contain an onboard atomic clock that generates and transmits a time signal. A GPS receiver will receive four of theses signals and use the timing information to work out how long the transmissions took to reach it and therefore the position of the receiver on Earth.

Current GPS systems are accurate to a few metres but to give an indication of how vital precision is, a one second drift of a GPS clock could see the GPS receiver be inaccurate by over 100 thousand miles (because of the huge distances light and therefore transmissions take in one second).

Many of these technologies that depend on atomic clocks utilise NTP servers as the preferred way to communicate with atomic clocks making the NTP time server one of the most crucial pieces of equipment in the communication industries.

About the Author

Richard N Williams is a technical author and specialist in atomic clocks, telecommunications, NTP and network time synchronisation helping to develop dedicated NTP clocks. Please visit us for more information about a Galleon ntp server or other ntp time server solutions.