The invention discloses a point-to-point telecommunications system comprising a first transmitter which transmits information to a first receiver via electromagnetic waves. The first transmitter transmits on a number of antenna using a first frequency on at least a first and a second of said beams...
A tubular aluminum housing, having vertically centered pinpoint light bulbs at either end in nose cones, is suspended on a stand by a gimbal system, and has an on-off switch and batteries such that the light bulbs will emit aligned light beams above and below the housing. The nose cones ...
For transmitting information via laser beams to and from other similar laser communication transceivers. Each transceiver comprises a wavelength locked beacon laser providing a beacon beam. The transceivers determine the precise location of other transceivers by detecting these beacon beams with beacon recei...
waves. The first transmitter transmits on a number of antenna using a first frequency on at least a first and a second of said beams, and the first and second beams contain different information. The point-to-point connection between the transmitter and the receiver is achieved by means of ...
The beams had weakened to the point of being dangerous.那些横梁已经老化到危险地地步。你给的句子中的point和这句话中point用法是相同的，因为to the point在此意思是 “到达某种程度，阶段，地步”，point相当于指一个（地）点，所以关系词用where（=everyone else is sick of it at this point...
Four-point bending tests were conducted on the PVA-ECC beams using the 200 kN Tecnotest Flex machine in accordance with standard ASTM C1609 (ASTM, 2006). Instead of three-point bending tests, four-point bending tests were performed so as to investigate the flexural behavior in the pure bendin...
The bending properties of composite materials are often characterized with simply supported beams under concentrated loads. The results from such tests are commonly based on homogeneous beam equations. For laminated materials, however, these formulas must be modified to account for the stacking sequence ...
This causes a variation in the PSF as light beams coming from different celestial objects cut through different parts of this 3D volume, unless all turbulence is located very close to the ground. The PSF is thus directional dependent and changes to (4)PSFϕ,α=‖FχPeiϕα(⋅,t)‖...
A wireless optical transceiver system which includes a passive optical antenna coupled by optical fiber to an active electronics module. The transceiver system receives and transmits light beams from/to the atmosphere,.and thereby commun... MA Doucet,DL Panak - US 被引量: 89发表: 2002年 Feasibl...
An Improved Methodology for Measuring the Interfacial Toughness of Sandwich Beams Existing interfacial toughness tests are evaluated for their accuracy and suitability for application to a wide range of sandwich structures and environments. It is shown that geometric nonlinearities and/or axial load couplin...