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By admin, November 21, 2009 1:58 PM

ReadyNAS NV+ Windows 7 wifi problems

Performance using wire connection from Win7 to nas around 14000kb/s
Performance using ftp wireless connection from Win7 to nas around 2000kb/s
Performance using wireless connection from Win7 to nas around 12kb/s
Performance using wireless connection from Win7 to WinXp share on other pc 2000kb/s

FIX ReadyNAS NV+ Windows 7 wifi problems
I finally fixed things by changing the MTU size to 1430 and turing of TCP Autotuning.

start, run, cmd
netsh interface ipv4 show subinterfaces
you will see default windows setting of 1500 on both the wireless and ethernet network cards
Need to set MTU of 1430 for best performance
ipconfig /all 
gives more info
note of the exact names of the network devices
netsh interface ipv4 set subinterface “Wireless Network Connection” mtu=1430 store=persistent

All DONE

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By admin, November 15, 2009 11:47 PM

Very Minimal CentOS Installation – we use CENTos for our Moon Rover

Any attempt to install CentOS using text-mode or kick-start will result into 340+ packages and lots of useless services. The only way you can achieve a true minimal CentOS is through a manual install process and using graphics mode.

Please seek more guidance from this manual for topics not covered here.

Checkpoint 1: Start graphics installation by hitting enter on boot prompt.

Checkpoint 2: Pick Customize now during package group selection.

Checkpoint 3: De-select everything (Yes, I repeat it! Deselect everything including base).

If you follow the suggested process, you will get a True Minimal CentOS installation with only 148 packages installed (and very few system services).

OTHER VERSION

For my version of the minimal install I:

1. Boot to CD 1
2. Type in “linux text” to get the text installation setup
3. Proceed normally with the installation until it asks which packages to install
4. I deselect all of the packages and then click on the “customize package selection” check box
5. I then hold down the “-” key, which scrolls through all of the package options, and deselects them all for me
6. I finish the install and I am done

7. Then I do a “yum update” to get latest
8. Then I do a “yum install <package>” for what ever packages I need but didn’t get during installation.

All of this with only CentOS 5 CD 1.

OR ANOTHER

You can do a minimal install that just requires the first CD by performing the following two steps during the installation:

• During the category/task selection, deselect all package categories, and choose the “Customize now” option at the bottom of screen.
• During the customized package selection, deselect everything.

There are reports that more than CD 1 is required in the following case:

• If you use some software raid options (this will also require CD 2 and 5)
• If you use encrypted filesystems

When the anaconda installer notes that additional disks will be required, but you desire a one CD install, the quick answer is one or more of the following approaches:

• Trim back and do a minimal install. Then once the install is up and running, pull in more packages with yum, and add more options later.
• Use the method: linux text ( Note: you cant do a minimal install using the Text mode, you *must* use the GUI mode if you are looking to install the minimal package set)

If you want to avoid using more than one CD, but want to install more than just the minimal set of packages, you could also consider doing a network installation. A network installation ISO (called boot.iso) is available from the 5/os/<arch>/images/ directory on CentOS mirrors.

CUSTOM DVD ISO OF CENTOS

http://lingxiang.tang.googlepages.com/createalesssizecentos5

http://www.centos.org/docs/5/html/Installation_Guide-en-US/ch-kickstart2.html

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By admin, November 12, 2009 10:56 PM

How to Backup MySql Databases to another machine.

Method 1 – Dump and reload

You can use mysqldump to create a simple backup of your database using the following syntax

a) Read Lock??????
b) Then dump all the databases by:

Single Databases
Dump only one database – Structure and Data
mysqldump -u [Username] -p [password] [databasename] > backupfile.sql

Dump only one database – Structure Only
mysqldump -u [Username] -p [password] –no-data [databasename] > structurebackup.sq   (remember to remove the []’s)

Multiple Databases
Dump only Select databases – Structure and Data
mysqldump -u [Username] -p [password] – -databases [databasename1] [databasename2] [databasename3] > multibackup.sql

Back up all the databases in the server- Structure and Data
mysqldump -u [Username] -p [password] – -all-databases> alldatabases.sql

Back up all the databases in the server- Structure Only
mysqldump -u [Username] -p [password] – -no-data –databases [databasename1] [databasename2] [databasename3]> allstructurebackup.sql

Ended up using

mysqldump – - all-databases > fulldb.dump

AND NOW only this shit works

mysqldump –all-databases -u root -p –all-databases>sqldumpp.sql

How to Restore your Mysql Database

Single Databases
mysql -u [Username] -p [password] [databasename] < databasefile.sql

Multiple Databases

Comments (6)

By admin, October 10, 2009 5:32 PM

NOKIA VOIP SETUP

Want to have a voip sip client on your phone.

STEP 1

make sure you phone has the latest firmware

First you will need to Create a Sip phone Gizmo Project account

Here is how to configure your Nokia E or N Series

STEP2

Go to Tools – Settings – Connection -SIP settings

Create the following profile

Profile Name: sipphone

Service Profile: IETF
Default Access point: (your WLAN AP name)
Public user name: sip: 1747yournumber@proxy01.sipphone.com
Use Compression: No
Registration: ” always on”
Use Security: No

Proxy Server: sip: proxy01.sipphone.com
Realm: proxy01.sipphone.com
User Name: 1747xxxxxxx
Password: [You SIPPhone password]
Allow loose routing: Yes
Transport Type: UDP
Port: 5060

Registrar Server: sip:proxy01.sipphone.com
Realm: proxy01.sipphone.com
User Name: 1747xxxxxxx
Password: [Your SIPPhone password]
Transport Type:UDP
Port: 5060

Then go to connection – Internet Tel. Settings

Create a new profile for “sipphone”(1747xxxxxxx), name it “sipphone”
In Connectivity – Internet tel. – Preferred profile – Choose “sipphone”

Then go back to Connection – SIP settings – sipphone and change the Registration from (when needed) to (Always on) now your phone will register to the
Gizmo network.

*If you don’t know your Sip number that starts with 1747 xxxxxx open the Gizmo Project program on your p.c click on edit -> profile.

problems

then you will probably need the sip settings for nokia application

depending on what phone model you have, which will determine which application you need to install

The app can be found at :

http://www.forum.nokia.com/info/sw.nokia.com/id/d476061e-90ca-42e9-b3ea-1a852f3808ec/SIP_VoIP_Settings.html

Once installed can be found in installed applications

Here you need to put
STUN server: stun01.sipphone.com
port 3478
UDP Nat Bind refresh: 40
CRLF refresh: Yes

E52 both for incomming and outgoing call Setup

1. Download SIP Voip Settings Tool(version 3.x from the dropdown) from Nokia.

2. Secondly there will be a new application called advanced voip settings in the net settings.

3. I think you know how to configure SIP Profiles in Nokia.

4. Once you are done configuring SIP Profiles then goto the advanced voip settings and add the SIP profile as a new service.

5. Once you have done all that then open up contacts and press the left navigation key..u will see the SIP service you configured. then there is an option to enable the service. Once you enable that you are done.

6. Now you should be able to make internet calls from e52.

Activate: SIP over umts/3g

3g isn’t activated for sip by default, trying it you get some ‘authentication failure)

you have to enable sip over 3g by setting AWCDMA to ON

but… where? you have to download and install “SIP VoIP Settings”

/Menü/System/Network/Advanced_VoIP_settings -> VoIP_services -> Sipgate -> Profile settings -> AWCDMA = On

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By admin, October 4, 2009 4:01 PM

Nvidia mediashield event monitor notifier

To say it bluntly why the Hell wound Nvidia a multi – million dollar company not spend a few extra bucks
what would it cost maybe 400-500 dollars to pay the programmer to send an email when the NVIDIA
raid has an error, say a disc failure.

I have searched and searched and could not find any way to fix it to notify you on raid failure.

Until I came across the free program “PA Server Monitor”
http://www.poweradmin.com/servermonitor/

http://www.poweradmin.com/servermonitor/ServerMonitorfree.exe

Install,
Configure your computer
and add email notifications

Now you can add the specific error numbers, and make it email you

All done

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By admin, September 23, 2009 9:58 PM

Unified Field Theory

In the middle of the 1800’s the first successful (classical)  field theory was developed by James Clerk Maxwell .
In 1820 Hans Christian Ørsted discovered that electric currents exerted forces on magnets.
While in 1831, Michael Faraday made the observation that time-varying magnetic fields could induce electric currents.

Until then, electricity and magnetism had been thought of as unrelated phenomena.

First Field Theory – 1800’s – James Clerk Maxwell proposed for electromagnetism,
Second Field Early – 20th century – Albert Einstein’s proposed general theory of relativity – dealing with gravitation.

The term unified field theory was coined by Einstein, who was attempting to prove that
electromagnetism and gravity were different manifestations of a single fundamental field thus The Unified Field Theory.

http://www.youtube.com/user/noonscience

When quantum theory entered the picture, the puzzle became more complex.

The theory of relativity explains the nature and behavior of all phenomena on the macroscopic level (things that are visible to the naked eye);

Quantum theory explains the nature and behavior of all phenomena on the microscopic (atomic and subatomic) level.
Perplexingly, however, the two theories are incompatible. Unconvinced that nature would prescribe totally different modes of behavior for phenomena that were simply scaled differently, Einstein sought a theory that would reconcile the two apparently irreconcilable theories that form the basis of modern physics.

Although electromagnetism and the strong and weak nuclear forces have long been explained by a single theory known as the standard model, gravitation does not fit into the equation.

–

Gage

–

Gravitational interaction: a long-range attractive interaction that acts on all particles with mass. The postulated exchange particle has been named the graviton.

Gravitational Anomaly

ss

Comments (1)

By admin, September 22, 2009 3:01 AM

So you want to automatically sync your Nokia Symbian S60 with Google Calendar and Contacts.

On the Nokia Phone

1. Open the web browser and go to:

• http://www.businesssoftware.nokia.com/mail_for_exchange_downloads.php or
• http://www.businesssoftware.nokia.com/mail_for_exchange/files/MailForExchange(2.7.22)_S60_3_1_hs.SISX

1. In the browser go to downloads and select Save to “Install Folder”
   Then go to Application manager and install it.
   It will say “You have no mail for exchange profile Create profile?”   YES

On the Nokia Phone

Enter Email: xxxxx@gmail.com
Domain: google
Username: xxxxx@gmail.com
Password: your password
Access Point: what access point you want it to automatically use (ps this may cost)

Retrieving Exchange Server Name …..

Website has sent a certificate with different website ….. accept permanently…. yes

Now set “Exchange Server” to be m.google.com
May be a good idea to turn off sync while roaming
leave everything else unchanged.

Set only Calendar and Contacts In the Sync Options say no to tasks and no to email

Go to Google Calendar
Go to your Dashboard > Service Settings > Mobile > enable Google Sync
However if you can’t find it don’t be surprised, you may not need to do this step any more.

Nokia Phone
Sync

And good Luck

Comments (0)

By admin, September 15, 2009 11:06 PM

Spacecraft go very long distances. Spacecraft have inertia, which means that they will keep going in the path they are in unless something changes that. If that path is off by even a tiny bit, they will keep going in that path, getting more and more off course, until they are far from their intended course. Course Correction LOCATION In order to know where a ship is, NASA needs to know two things: how far it is from Earth and its location in space. Generally, NASA uses the downlink, or radio signal from a spacecraft to a radio telescope in the DSN, to tell where it is. The distance between Earth and the ship is measured by sending up a radio signal from Earth with a time code on it. The spacecraft “bounces” back the signal, and people on the ground can see how long it took to travel from Earth to the ship and back. Since all radio waves travel at the speed of light, scientists can look at how long it took for the signal to make it to the ship and back and figure out the distance it traveled. The angle that the radiotelescope is pointing when it receives the signal tells the direction of the ship. A more precise way of measuring uses two radio telescopes. When a ship is in space, it sends a signal back to Earth. Three times a day, this signal can be received by two different DSN radio telescopes at once. They can compare how far the ship is from each signal. They then get the distance to a known object in space that doesn’t change its location, like a pulsar, (pulsing star), and from the three locations, (two telescopes and a pulsar) they can use a technique called triangulation to get the ship’s location. Three Point Camera TPC XYZ axis cameras with star mapping charts Some spacecraft, like DS1, can use asteroids and other objects in space to figure out where they are. Using a process called Optical Navigation or OpNav, pictures are taken of particular asteroids. The asteroids’ location relative to the spacecraft are used to determine position, and the position is compared to where the ship should be. At that point the ship can do a course correction. OpNav needs at least three objects to compare and uses triangulation to figure out a ship’s location.

Comments (1)

By admin, September 14, 2009 3:23 AM

Propulsion Systems

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By admin, September 14, 2009 3:23 AM

When your computer behaves erratically, mauls your data, or just “crashes” completely, it can be frustrating. But for an astronaut trusting a computer to run navigation and life-support systems, computer glitches could be fatal.

Unfortunately, the radiation that pervades space can trigger such glitches. When high-speed particles, such as cosmic rays, collide with the microscopic circuitry of computer chips, they can cause chips to make errors. If those errors send the spacecraft flying off in the wrong direction or disrupt the life-support system, it could be bad news.

To ensure safety, most space missions use radiation hardened computer chips. “Rad-hard” chips are unlike ordinary chips in many ways. For example, they contain extra transistors that take more energy to switch on and off. Cosmic rays can’t trigger them so easily. Rad-hard chips continue to do accurate calculations when ordinary chips might “glitch.”

NASA relies almost exclusively on these extra-durable chips to make computers space-worthy. But these custom-made chips have some downsides: They’re expensive, power hungry, and slow — as much as 10 times slower than an equivalent CPU in a modern consumer desktop PC.

With NASA sending people back to the moon and on to Mars–see the Vision for Space Exploration–mission planners would love to give their spacecraft more computing horsepower.

Having more computing power onboard would help spacecraft conserve one of their most limited resources: bandwidth. The bandwidth available for beaming data back to Earth is often a bottleneck, with transmission speeds even slower than old dial-up modems. If the reams of raw data gathered by the spacecraft’s sensors could be “crunched” onboard, scientists could beam back just the results, which would take much less bandwidth.

Objects, particularly spacecraft structures, antennas, solar arrays and other spacecraft equipment,  are shielded against damage from momentary exposure to high energy electromagnetic radiation in the form of high energy optical (laser) radiation or nuclear radiation by a radiation barrier or shield constructed of fibrous silica refractory composite material like that used for the heat shield tiles on the shuttle spacecraft.

Major radiation damage sources

Typical sources of exposure of electronics to ionizing radiation are solar wind and the Van Allen radiation belts for satellites, nuclear reactors in power plants for sensors and control circuits, residual radiation from isotopes in chip packaging materials, cosmic radiation for both high-altitude airplanes and satellites, and nuclear explosions for potentially all military and civilian electronics.

• Cosmic rays come from all directions and consist of approx. 85% protons, 14% alpha particles, and 1% heavy ions, together with ultraviolet radiation and x-rays. Most effects are caused by particles with energies between 10⁸ and 2*10¹⁰ eV, though there are even particles with energies up to 10²⁰ eV. The atmosphere filters most of these, so they are primarily a concern for high-altitude applications like stratospheric jets and satellites.

• Solar particle events come from the direction of the sun and consist of a large flux of high-energy (several GeV) protons and heavy ions, again accompanied with UV and x-ray radiation. They cause a scale of problems for satellites, ranging from radiation damage to loss of altitude by heating up the upper regions of the atmosphere, causing them to raise up, and decelerating the low-orbit satellites by friction.

• Van Allen radiation belts contain electrons (up to about 10 MeV) and protons (up to 100s MeV) trapped in the geomagnetic field. The particle flux in the regions farther from the Earth can vary wildly depending on the actual conditions of the sun and the magnetosphere. Due to their position they pose a concern for satellites.

• Secondary particles result from interaction of other kinds of radiation with structures around the electronic devices.

• Nuclear reactors produce gamma radiation and neutron radiation which can affect sensor and control circuits in nuclear power plants.

• Nuclear explosions produce a short, extremely intense surge of the entire spectrum of electromagnetic radiation, electromagnetic pulse (EMP), neutron radiation, and flux of both primary and secondary charged particles. In case of a nuclear war they pose a potential concern for all civilian and military electronics.

• Chip packaging materials were an insidious source of radiation that was found to be causing soft errors in new DRAM chips in the 1970s. Traces of radioactive elements in the packaging of the chips were producing alpha particles, which were then occasionally discharging some of the capacitors used to store the DRAM data bits. These effects have been reduced today by using purer packaging materials, and employing error-correcting codes to detect and often correct DRAM errors.