New life for dead Tempe network? Another firm has expressed interest in buying the pennies on the dollar assets that remain of the former Kite Networks installation in Tempe from the firm that financed the venture as long as they can negotiate a new, more favorable deal with the city for mounting and removal rights. CTC, Inc., which the East Valley Tribune reports runs networks in the Kansas City, Mo., area, thinks there's an opportunity. The article notes that reception problems were due in part to the prevalence of stucco in Tempe, common in the southwest. Stucco walls layer plaster or other materials on a wire mesh for strength that turns a house into a bit of an accidental Faraday cage, partially shielding the home from electromagnetic radiation. (Could I go so far to say that Tempe's network could be a phoenix? Ouch.)

Wake up, you darn computer: Intel's new Remote Wake motherboards won't work with Wi-Fi, it's important to note. The feature, announced today, will let an incoming VoIP call (the articles all say "phone call over the Internet") to wake a computer, as long as the call comes from a particular source. Of course, the standard SIP protocol for VoIP doesn't have the kind of security and integrity that would allow this; Intel has to overcome the problem with network address translation that renders most computer unreachable from outside the local network without a separate service like GoToMyPC or LogMeIn; and it will only work for computers connected via Ethernet to a local network, because Wi-Fi is off when a computer sleeps, while Ethernet can remain lightly active. I don't have the protocol details yet, but there's long been a Wake on LAN protocol that required support in a router, operating system, and Ethernet card; Intel may be leveraging this.

Zipit gives away text messaging for a year, changes prices, options: The Zipit Wireless Messenger 2 (Z2) was introduced in Dec. 2007 with a number of interesting features for a messaging appliance targeted at teens--and their fretting parents. With no Web portal, the $150 device included unlimited Wi-Fi on Wayport's McDonald's network (now nearly 10,000 locations), and support for popular IM clients. It also included SMS with major cell carries, charging $5 per month for 1,500 incoming and 1,500 outgoing messages. Uptake must have been poor, as the manufacturer announced today that purchases until 31-July-2008 would include a year of free text messages. The company also modified its plan without noting that fact, increasing messages to a "reasonable personal usage" of 5,000 incoming and 5,000 outgoing messages per month. There are no overage charges. The service will now cost $30 per year instead of $5 per month for new purchasers starting 1-August-2008. That's a 50-percent price reduction (over $5 times 12), but it's often much cheaper to bill annually in advance.

Wi-Fi Alliance cited in WSJ as model for multipartner alliance: An interesting analysis in the Wall Street Journal's Business Insight section points to the Wi-Fi Alliance standards based, no-company-on-top approach as one that led it to win out through both technology and organization over other standards that might have taken precedence. I've been stunned over the years how a group that has a board comprised of the most powerful and competitive interests in this market segment, and which has hundreds of much smaller members, has managed to keep alive the notion of interoperability for the greater good of the industry and customers. 802.11n's long delay certainly threatened harmony--especially with some ugly proprietary slap-ons to 802.11g--but the alliance continues to keep the technology in equilibrium, while still allowing individual companies to differentiate their products with little difficulty.

In development for more than 30 years, the research is beginning to bear fruit, and may soon spawn more powerful bombs, warheads that tear apart stone and concrete, mines that can be set to stun or kill, and grenades that can swat rockets or mortar rounds out of the sky like flies.

"You can get effects that are more precisely tailored to a particular target," says John Pike, director of Washington military research group GlobalSecurity.org. "And you're able to get a greater effect out of a smaller munition."

Reactive materials are combinations of materials that are normally stable, but, when subjected to sudden shock -- such as striking a target -- release a large amount of energy. Depending on the composition and warhead design, the energy can be released as heat, a blast or a combination of the two. Unlike conventional explosives, RMs cannot be set off by fuses. Technically, they are classified as flammable solids, and they are less hazardous to transport and store than explosives.

While they're more energetic than explosives, RMs are not intended to be a substitute. Instead, they will replace warhead components normally made of metal.

An analysis of U.S. military procurement papers and defense contractor presentations, as well as interviews with companies working on the technology, suggests that a wave of munitions using reactive materials may be headed for a battlefield near you.

The material can dramatically magnify the yield of conventional bombs, and do away with the waste embodied by a bomb's inert metal skin. The U.S. Air Force's 5,000 BLU-122 bunker buster, for example, contains just 780 pounds of explosives; the other 80 percent is the bomb's thick steel casing. DARPA's Reactive Munition program (.doc) aims to replace that steel with RMs, to create a bomb with a blast four times as powerful. Alternatively, a new bomb could be half the size of existing weapons but twice as powerful.

Conventional warheads could also benefit from an RM makeover. For centuries, shells have blasted out steel shrapnel, small pieces of metal that cause damage with their high speed. Defense contractor Alliant Techsystems is developing a warhead called BattleAxe for the Air Force that uses fragments made of RM instead of metal. Those fragments will explode on impact, making the warhead far more effective against soft targets like trucks.

RM shrapnel is also being touted as the ideal way of shooting down incoming rockets and mortar bombs (.pdf).

A radar-guided defense pod can automatically engage incoming rockets or other threats using RM-based grenades. Weapons designers suggest that RMs can be five to ten times as effective as the existing inert shrapnel for this task. Moreover, RM shrapnel can be engineered to burn out at a set distance, so there is no hazard to nearby friendly forces.

Bullets can even be made of RM. The Navy's new electromagnetic railgun has been criticized because it can only fire solid slugs, not the usual explosive shells. However, documents reveal that tungsten-based RM rounds are being developed for the weapon. These will explode on impact, making the railgun effective against buildings, ships and vehicles.

Shaped charges are another application where RMs can increase the effectiveness of existing designs. In a shaped charge, a hollow metal cone is surrounded by explosive material, which is then detonated, forcing the blast through the small end of the cone.

"The action is analogous to stamping on an open toothpaste tube, ejecting the liquid contents," says Douglas Millard of British defense contractors QinetiQ.

Replace the metal liner with RM, and the explosive power of that jet will increase dramatically.

"Such reactions are highly exothermic and therefore lead to the release of large amounts of energy, which is in addition to the kinetic energy within the jet," Millard says. "An increase in the energy coupled into the target occurs and this results in the creation of greater damage to the target."

QinetiQ is marketing an RM-based shaped charge called Connex for oil-well perforation in the civil market. Meanwhile, the U.S. Army is developing a demolition charge called Bam Bam that blasts a jet of RM deep into stone or concrete, producing massive damage

One version of the Bam Bam charge is intended for demolishing bridges and other structures. An alternative version blasts broader, shallower craters in roads or runways, making them useless.

RMs will also transform another mutation called the Explosively Formed Penetrator, a modified version of the shaped charge. Instead of producing a narrow, short-range jet, the Penetrator fires an aerodynamic slug of metal over a long distance. It's best known as a favored weapon of insurgents in Iraq. Again, replacing the metal with RM makes a much deadlier weapon -- after punching through armor, the slug releases energy like a grenade going off.

If you're a weapons designer, RMs also offer amazing flexibility. Alliant Techsystems is building a variable landmine (.pps) -- a so-called "dial-a-yield" weapon that can produce a range of different effects.

At the lowest setting, most of the output would be light -- a dazzling warning that would be impossible to miss. A higher setting would produce intense heat, creating a "discomfort zone" to drive off intruders. The third setting produces a nonlethal blast, like the concussion stun grenades used by Special Forces. If lethal force is called for, the mine could be set to produce either inert shrapnel or reactive shrapnel that explodes on impact.

RM munitions may face legal challenges. Under the St. Petersburg Declaration of 1868, the use of explosive projectiles with a weight of less than 400 grams is forbidden, as is using incendiary ammunition, like napalm, against personnel. But RMs are not technically explosive or incendiary, and although the effect on human targets might cause protests from some groups, they are likely to be accepted, human rights experts say.

"Like any weapon, it would have to go through a lengthy effectiveness and then legal review, " says Marc Garlasco, senior military analyst at Human Rights Watch. "If used in the open against military targets, it does not seem to have any obvious problems at first blush."

However, there may be technology issues too. Although the developers sound very upbeat in all their descriptions of RM munitions, producing material that will reliably release energy only when required is extremely challenging.

"The fact that they've been working on it so long and don't seem to have fielded anything yet suggests that there may be a problem with the technology," GlobalSecurity's Pike says.

Normally new weapons are fielded rapidly if there is a military demand -- assuming they work. So far, RMs have not made it into the field, and the technology may not be as mature as developers suggest.

But Pike also notes that there has been an unprecedented surge in munitions development over the last few years, with "all kinds of weird stuff" being developed.

So after decades of being kept very quiet, reactive materials may soon be making a lot of noise.

---

Check out Danger Room for more on reactive materials.

Exploding head: An English schoolteacher's head exploded due to electromagnetic radiation at his school in Cotswold as part of an experiment gone awry.

Wi-Fi over Ethernet combines electromagnetic resonance--the ability of a EMF to excite signals in wires--with excess wired capacity in a manner similar to how broadband over powerline works. Where properly equipped 802.11af Ethernet switches and adapters are available, coupled with WOE-capable Wi-Fi systems, the Wi-Fi signals will simply be picked up and carried by the Ethernet network. Switching and transmission then become limited to the extent of the wired network--which will improve throughput and range. (A future standard might allow passive powering of lightweight devices from Ethernet, which is a neat reversal.)

This is in the same category of new convergent standards such as Bluetooth over 802.11 and FireWire (IEEE 1394) over IEEE 741-2007: ways to provide better specs on one standard by combining it with another that has a complementary purpose.

Now, of course, modern computing systems tend to include gigabit Ethernet and Wi-Fi, so why do we need a third modality that combines the two? Partly because of new devices like the MacBook Air and smartphones like BlackBerrys with Wi-Fi built in. Without an Ethernet adapter, the range of these devices can be limited, and throughput restricted.

You were waiting for the magic number: How fast is WoE? Nearly 1600 Mbps raw speed, and about 30 Mbps of raw throughput. Before you scoff, remember that you might be able to use WoE over hundreds of meters across a switched Ethernet network, where a Wi-Fi signal might stretch just a hundred or two hundred feet. If Wi-Fi beats WoE, a computer will use Wi-F.

The Wi-Fi Alliance hasn't set the date of their certification yet, but I'm told it will happen any day. The mark will be added to the list of A, B, G, Draft N, WMM Power Save, and other symbols, as AF. The industry is considering a campaign around the phrase, "WoE is me(tm)!" trying to capture the excitement of the new synergy. Again, unfortunate acronym.

The IEEE has finalized and approved a draft, but final ratification isn't expected until 1 April 2009.

A British company has developed a camera that can detect weapons, drugs or explosives hidden under people's clothes from up to 25 meters away in what could be a breakthrough for the security industry.

The T5000 camera, created by a company called ThruVision, uses what it calls "passive imaging technology" to identify objects by the natural electromagnetic rays -- known as Terahertz or T-rays -- that they emit.

The high-powered camera can detect hidden objects from up to 80 feet away and is effective even when people are moving. It does not reveal physical body details and the screening is harmless, the company says.

If this is real, it seems much less invasive than backscatter X ray.