Spider

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Spider

See: SPDRs

Spider

Also called a Standard & Poor's Depositary Receipt or a SPDR. An exchange-traded fund that tracks the Standard and Poor's 500. The organization issuing the SPDR owns each of the stocks traded on the S&P 500 in approximate ratio to their market capitalization. SPDR shares can be bought, sold, short-sold, traded on margin; they generally function as if they were stocks. Dividends are paid quarterly and are based on the accumulated dividends of all the stocks represented in the SPDR, less any expenses. Investors use SPDRs (and indeed all exchange-traded funds) as a way to easily diversify their portfolios at relatively low cost. Investors also see the demand for SPDRs as an indicator of which direction the market believes the S&P 500 is going. See also: Mid-Cap SPDR.

spider

References in periodicals archive ?
While cloaking research is using light to hide large objects, sub-wavelength imaging is using light to make minute objects that were once hidden, visible.
With the power of protected mode, Cloaking allows drivers to run faster and more reliably, and to use far less memory.
Three decades later, a young wizard named Harry Potter brought invisibility cloaking down to personal size.
Until now, he explains, cloaking research has revolved around manipulating trajectories of waves.
Depending on the construction of the cloaking device, the shape and other properties of the ghost images can be altered.
The wideband invisibility cloaking is enabled with the firm's proprietary fractal metamaterial technology.
Since the goal was to demonstrate the basic principles of cloaking, we didn't worry about these reflections," he said.
This feature is what separates the new work from other cloaking methods that completely isolate objects from the environment.
In the team's paper at CLEO: 2011, Cheng Sun of Northwestern describes how a rigid sponge-like cloaking structure less than 10 millimeters long on a side was built up in 220 layers, each precisely defined to vary the index of refraction and bend light to render invisible anything located beneath a shallow concave bump on the cloak's bottom surface.
Washington, May 22 ( ANI ): Using "plasmonic cloaking," engineers at Stanford and the University of Pennsylvania have created an invisible, light-detecting device that can "see without being seen.
The flat shield has shown that cloaking is possible, but the device is probably not of much practical value, Schurig notes.