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Alcatel Idol 4S (with VR Goggles) Alcatel impressed us with last year's Idol 3, it proved that a relatively inexpensive phone could still be stylish and slim with decent specs. The $399 Idol 4S with VR Goggles is the company's highest end phone yet, and it does indeed share some specs with much more expensive phones-- it's slim at 7mm, is really good looking with black glass on the back and chamfered metal on the sides and it has a QHD 5.5" AMOLED display that has 600 nits of brightness. 8MP and 16MP cameras grace the front and back and the usual goodies like NFC, WiFi 802.11ac and a fingerprint scanner are what we'd expect on a flagship. The midrange 1.8 GHz Snapdragon 652 is actually a quicker performer and the phone has 3 gigs of RAM and 32 gigs of storage. Alcatel tries to set the Idol 4S apart with the inclusion of VR goggles, but they prove to be the weakest link. The phone is unlocked for use with any GSM carrier, and this US-centric model has 4G LTE for AT&T, T-Mobile and others.
The plasma layer is flanked by electrodes, with glass panels in the front and rear. Plasma TVs use similar phosphor screens as cathode-ray tube TVs, making the color depth similar in both technologies.
Three reflectors have been developed and tested to assess the performance of a distributed network of piezocomposite actuators for correcting thermal deformations and total wave-front error. The primary testbed article is an active composite reflector, composed of a spherically curved panel with a graphite face sheet and aluminum honeycomb core composite, and then augmented with a network of 90 distributed piezoelectric composite actuators. The piezoelectric actuator system may be used for correcting as-built residual shape errors, and for controlling low-order, thermally-induced quasi-static distortions of the panel. In this study, thermally-induced surface deformations of 1 to 5 microns were deliberately introduced onto the reflector, then measured using a speckle holography interferometer system. The reflector surface figure was subsequently corrected to a tolerance of 50 nm using the actuators embedded in the reflector's back face sheet. Two additional test articles were constructed: a borosilicate at window at 150 mm diameter with 18 actuators bonded to the back surface; and a direct metal laser sintered reflector with spherical curvature, 230 mm diameter, and 12 actuators bonded to the back surface. In the case of the glass reflector, absolute measurements were performed with an interferometer and the absolute surface was corrected. These test articles were evaluated to determine their absolute surface control capabilities, as well as to assess a multiphysics modeling effort developed under this program for the prediction of active reflector response. This paper will describe the design, construction, and testing of active reflector systems under thermal loads, and subsequent correction of surface shape via distributed peizeoelctric actuation. 2b1af7f3a8