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Official blog of the «Radeko Group» LLC

27 August 2012

Room-temperature maser could change space communication

 

 
Now to answer the first question that you're probably thinking - what in the world is a maser?
 
It's actually not that complicated. It is similar to a laser, but instead of using light to emit the signal it uses microwaves. This kind of technology has become increasingly important at NASA and other enterprises that operate in space.
 
Masers are used in that context to help boost radio signals. For example, the Curiosity rover currently exploring Mars uses maser technology to ensure its signals can be sent through space and in turn back to Earth.
 
The problem, though, is that until now, masers required enormous cooling equipment to keep them from overheating, something that obviously would cause a huge problem for vehicles and other items millions of miles away.
 
But there is hope for much more scalable masers, thanks to a new report published in the science journal Nature.
 
The room-temperature maser at the UK's National Physical Laboratory was achieved after scientists  altered the chemical components of a crystal and then used microwaves to restore them to normal. They realized that doing so also let off a stream of identical microwaves, reducing the strain and heat required for the process.
 
Ultimately,  researchers suggest that room-temperature MASERs could be used to make more sensitive medical instruments for scanning patients, improved chemical sensors for remotely detecting explosives; lower-noise read-out mechanisms for quantum computers and better radio telescopes for potentially detecting life on other planets. 
 
"For half a century the MASER has been the forgotten, inconvenient cousin of the LASER. Our design breakthrough will enable MASERs to be used by industry and consumers,” said the researchers.
 
"When LASERs were invented no one quite knew exactly how they would be used, and yet the technology flourished to the point that LASERs have now become ubiquitous in our everyday lives. We've still got a long way to go before the MASER reaches that level, but our breakthrough does mean that this technology can literally come out of the cold and start becoming more useful."

Источник: TQgdaily



23 August 2012

New type of carbon is hard enough to dent diamonds

 

A new form of very hard carbon clusters with a rather unusual structure is so hard it dented the diamond anvil used in its creation.

The clusters are a mix of crystalline and disordered structures - something previously theorized but never before created.

The team - led by Carnegie's Lin Yang - started with a substance called carbon-60 cages, made of highly organized balls of carbon constructed of pentagon and hexagon rings bonded together to form a round, hollow shape.

An organic xylene solvent was put into the spaces between the balls to form a new structure, and pressure was applied to see how it changed under different stresses.

At relatively low pressure, the carbon-60's cage structure remained. But as the pressure increased, the cage structures started to collapse into more amorphous carbon clusters. However, the amorphous clusters remained in place, forming a lattice structure.

The team found , though, that within a narrow window of pressure, about 320,000 times the normal atmosphere, the new structured carbon forms without bouncing back to the cage structure when the pressure is removed.

The solvent's clearly key, as when it's removed by heat treatment, the material loses its lattice periodicity. Because there are many similar solvents, it's theoretically possible, says the team, that a variety of similar, but slightly different, carbon lattices could be created using this pressure method.

"We created a new type of carbon material, one that is comparable to diamond in its inability to be compressed," says Wang. "Once created under extreme pressures, this material can exist at normal conditions, meaning it could be used for a wide array of practical applications."

He says there are possible mechanical, electronic and electrochemical uses for the substance.

Link: TGdaily



19 July 2012 News

Megafon launches 4G network in Moscow

 

Following Yota, Megafon has launched its LTE network services. The operator expects 50 thousand of its customers in Moscow and the region to be using the 4G network by late 2012.

Megafon has announced the launch of a 4G network in Moscow. The operator says, apart from a higher mobile internet speed as compared to earlier generation networks, the great advantage of the 4G network is its compatibility with 3G and GSM networks. The two latter will fill in where the 4G network is not available.

The company says over 1 thousand 4G base stations operate in the region and their number will grow to 3 thousand by the year end. Head of Megafon’s Moscow branch Andrey Kurdanov says the company injected around 700 million rubles ($23 million) for the 4G network infrastructure and development.

The company has been actively working on the equipment to support the 4G network. Recently the operator’s first modem supporting 4G has appeared on the market. It is going to start the sales of Samsung Galaxy Tab 8.9 LTE Megafon Edition 4G tablets. It will sell at around 30 thousand rubles ($1000).


Moscow has become the second city where Megafon launched its 4G network. Next on the list are Krasnodar and Sochi.

 

“We are expecting about 50 thousand of our customers to be using the 4G network by late 2012”, says Natalia Spitsina, Megafon Moscow Commercial Director. Megafon will also launch its 4G network in over 20 cities around Moscow, such as Khimki, Podolsk, Korolyov, and Mitishchi.

Megafon is the first operator of the Three Big (Beeline, MTS, Megafon) that has launched a 4G network in Moscow. It previously launched similar services for its Novosibirsk customers; there it shares the LTE infrastructure with Skartel (Yota brand). The companies agreed on that in 2011. The Novosibirsk network was launched in April and has become the first commercial 4G network in Russia.

Earlier Megafon said it would launch the 4G network in Krasnodar and Sochi within the first half of 2012 and in St Petersburg, Samara, Vladivostok, Ufa, Kostroma and other cities within the second half of 2012.

On May 10th Skartel had launched an LTE network in Moscow by resetting its WiMAX network. Megafon and Skartel use the same infrastructure for their 4G services in Moscow.

 

Источник: Cnews



19 October 2011 News

iphone 4S maintains GLONASS

 

Russian Global Navigation System (GLONASS) is listed among navigation systems in oficial technical characteristics table of iphone 4S. Previous editions of iphone didn't maintain GLONASS*

 

*GLONASS is one of the two exsisting global navigation systems together with US NAVSTAR GPS



18 October 2011 News

LED color chart, characteristics and best for.

While there are many variations of white LED light available today, they all fall under three basic categorical descriptions: “warm white,” “pure white,” and “cool white.” At opposite ends of the chart are “warm white,” which is a yellow tinted white light, and “cool white,” which displays a tint of blue. In between is “pure white” which, as the name suggests, is pretty much the most pure form white LED light available.

Only white and blue lights are measured in this sense; LEDs not in the white-blue spectrum do not.

Despite the fact that LEDs produce light by a process other than heating, we still use correlated color temperature (CCT) when describing the appearance of the LED as it relates to the appearance of a black body radiator (in this example, that would be the piece of metal). The CCT, in this sense, is simply the closest point on the black body curve to a particular color as defined by its chromaticity value.

Different temperatures = different colors

When the glow of the white LED light is slightly yellow, it’s typically around 3000° Kelvin (K). Due to the yellowish tint of the light, this particular color is referred to as “warm white.” Further up the scale, “pure white” LED light measures at around 4500°K and even higher up is “cool blue” white light, which displays a reading of 6500°K or more.

 

Naturally, there’s some confusion over this. If the temperature is low, why is it considered “warm?” And if it’s high, why are we calling it “cool”?

You must consider the answer to this in the visual sense of how we’re using the words. The human mind has been conditioned for thousands and thousands of years to agree that the color yellow indicates warmth and blue means cool. As such, the words “warm” and “cool” are simply adjectives used to describe the type of color being emitted.

Examples

There are a ton of white light examples all around us that can be applied to the color temperature scale. The temperatures listed below are approximate (so save yourselves the hate letters, Kelvin enthusiasts):

White light at:

• Sunrise/Sunset: 2500°K
• Early afternoon sunlight: 5000°K
• Overcast sky: 6000°K
• Shade from blue sky: 7500°K
• Blue sky: 10,000°K +

Here’s how this translates visually:

Things to keep in mind when purchasing a white LED light

Higher color temperatures do not necessarily indicate a higher quality, or more expensive light. It also doesn’t mean that it’s any brighter than others. Variations in diodes largely affect the price of the products, not the LED’s color temperature range.

Also keep in mind that LEDs aren’t perfect. Every diode has a slight variation on their color temperature. Cheaper and less quality LEDs have a fairly wide color temperature range. For example, a warm white LED could range between 3000-3500°K. This is a pretty significant difference. High quality LEDs, on the other hand, have a somewhat tighter range, often times just 150°K difference.

Why is this important? Unexpected variations in white light could turn out to be quite noticeable depending upon how the LED is being used. Warm light is best used in living spaces as it tends to be more flattering to clothing and skin tones. Cool light, on the other hand, is preferred for visual tasks, as it produces excellent contrast. For best application practices, keep in mind these easy-to-remember basics:



6 October 2011 News

Be a yardstick of quality. Some people aren't used to an environment where excellence is expected. Steve Jobs RIP

Steve Jobs (1955 - 2011) RIP

October 5-th Apple announced the death of its chairman and former CEO because of long-term cancer. 

“Steve’s brilliance, passion and energy were the source of countless innovations that enrich and improve all of our lives,” Apple said. “The world is immeasurably better because of Steve.”



6 October 2011 News

US communication satellite succefully launched to the orbit from the booster "ZENITH-2sB"

 

7.35  AM MoscowTime from the Bakonur aerodrom US communication satellite  "INTELSAT-18" had been succefully launched to the orbit from a booster "ZENITH-2sB" . The satellite will transmit signals on the North America, Australia, Oceania, Eastern Asia. The satellite has 24 C-band transponders and 12 KU-band transponders. Satellites lifetime - 15 years, weight - 3200 kg, load field capacity - 4,9 kilowatt.



4 October 2011 News

Boston Dynamics presents the AlphaDog Proto a lab prototype for the Legged Squad Support System

 

The AlphaDog Proto is a lab prototype for the Legged Squad Support System, a robot being developed by Boston Dynamics with funding from DARPA and the US Marine Corps. When fully developed the system will carry 400 lbs of payload on 20-mile missions in rough terrain. The first version of the complete robot will be completed in 2012. This video shows early results from the control development process. In this video the robot is powered remotely. AlphaDog is designed to be over 10x quieter than BigDog. The field version of AlphaDog will have a head packed with terrain sensors.



4 October 2011 News

GLONASS satellites determine location of objects with an accuracy of 5 meters.

On the night between 2-d and 3-d  of October at 00.15 MT from Pesetsk aerodrom the 24-th GLONASS satellite  had been succefully launched from a booster "soyuz - 2.1 b" .

As RSN radiostation reported since now the GLONASS system determines the location of the object with an accuracy of 5 meters, against previous 50. GLONASS still lags  behind its American counterpart. Its development and improvement is of a great political and social significance.



28 September 2011 News

TI's new 6LoWPAN sub-1GHz solutions deliver mesh wireless Internet connectivity to metering, security, street lighting, building automation and other spaces

 

Imagine street lights that are wirelessly monitored and controlled, enabling city planners to plan bulb replacements and ensure proper lighting for drivers if weather conditions change. This and other great things will be possible with TI's new sub -1 GHz 6LoWPAN technology.

Texas Instruments Incorporated (TI) (NYSE: TXN), the industry leader in highly integrated wireless connectivity solutions, today introduced new sub-1 GHz 6LoWPAN solutions, aimed at providing a gateway for remote, low-cost wireless sensors to connect to the Internet and a wireless extension of wired IPv6 infrastructures. By operating in the sub-1GHz band, TI's 6LoWPAN solutions offer longer wireless range at lower power levels than traditional 2.4 GHz-based 6LoWPAN offerings. The 6LoWPAN solutions support large-scale mesh networks and are suitable for applications such as Smart Grid, security, home and building automation, street lighting and other wireless sensor networks. The new product family includes the CC1180 network processor, CC430  complete system-on-chip (SoC) microcontrollers, 6LoWPAN software stack, and CC-6LOWPAN-DK-868 development kit.



26 September 2011 News

TI introduces 36-volt op amp for the automotive market

Micro package option is 50-percent smaller than competitive devices

introduced an automotive-qualified 36-V, single-supply, low-noise op amp (operational amplifier) that can operate on supplies ranging from +2.7 V to +36 V. The OPA171-Q 1offers high-precision performance in a cost-effective, low-power device. In addition to industry-standard packaging, the device is available for automotive qualification in the SOT-553 micro package, which is 50-percent smaller than comparable devices available today, and can reduce board space for automotive applications including HEV/EV, tracking amplifiers in power modules, and transducer amplifiers.



26 September 2011 ExpositionsNews

Robotic Orchestra Hits Right Notes for Industrial Control

The tech world is rife with conductors, but this one has nothing to do with transmitting heat, electricity or light. In this case, the conductor leads a robotic orchestra.

Dubbed the Intel Industrial Control in Concert, this machine-to-machine-controlled collection of digitally connected vibraphones, xylophones, high-hats and other sound-making devices is intended to demonstrate the simplicity of building a state-of-the-art smart system using off-the-shelf technologies based on common x86 chip architecture, according to Intel's Drew Pool.

The orchestra's conductor is a palm-sized computer motherboard powered by an Intel Atom processor surrounded by dozens of wires and white PVC tubing that snakes from one instrument to the next. The crowd-pleasing project cost approximately $160,000 to build and debuted at the Intel Developer Forum in San Francisco.

 



21 September 2011 News

Military satellite "Kosmos-2473" launched into orbit

 

On wednesday 2.47 am MT  from airdrom Baikonur (Kazahstan) booster "Proton-M" took off, then at estimated time 11.53 MT a satellite owned by Russian Ministry of Defense was launched into orbit. From Earth satellite will be operated by The Main testing senter of check-outs and operating of space crafts named after Titov. Launch and leading out of a satellite were in a normal mode. That was a first launch after an emergency starting of a cargo spacecraft on August 24. 



18 August 2011

Fifth-generation fighter aircraft T-50 demonstrated on MAKS-2011

 

 

In the sky of Jukovkyi in terms of International Aviation and Space Salon - MAKS - 2011  a prototype of Russian fifth-generation  fighter aircraft  T-50 had demonstrated its abilities. The aircraft was shown to the public at first time.  For  the secrecy reasons,  on MAKS the aircraft flew from the other aerodrom, so could had been seen  only in the air.

 

Rerports of the soonest start T-50, or as it is also called the PAK FA (promising aviation complex for tactical aviation),  to the air had been coming since 2005, but PAK FA only had been taken off  in January 2010. Distinctive characteristics of the T-50 fighter aircraft are:extra maneuverability  obtained due to the engines with thrust vectoring control, radars with phased arrays, multifunctionality, replacement of pointer instruments with displays and other innovations. 

 

In comparison with its main rival american F-22 Raptor (the solitary 5-th generation fighter) T-50 is expected to be more maneuvering.



18 August 2011

Telecommunication satellite “Express-AM4” launched from Baikonur.


 

 1:25 am satellite “Express-AM4” – the largest in a line of satellites “Express”,  launched from  Baikonur. The satellite was designed and manufactured by European company EADS Astrium together with Khrunichev  for  FSUE “Space communications”. Mass of 5775 kg satellite is built on a Eurostar E3000 platform  and is equipped with  24 C-band transponders, 28 Ku-band and two Ka-band and three L-band for sustained coverage throughout Russia and neighboring countries, the "Interfax" informes. The satellite is designed to provide a wide range of telecommunication  services - it is it that will broadcast digital television signals to the Russian Far East and later to the other territory of  Russia and neighboring states.

 

Head of Communication Ministry Shchegolev, visiting the launch called it: “an outstanding from its parameters telecommunication satellite not only for Russia, but for the whole world” (RIA novosti).

 

 




© Radeko Group, 2011