University of Michigan Library. Selden Breck Construction [East Stack]

East stack. Albert Kahn, architect. Selden Breck contractors built stacks 1916-1918. Construction of General Library Building authorized June 1916. Two stacks built at right angles to 1898 stacks, which were retained. In 1918 Old Library was demolished and front (north side) of General Library begun. Completed in 1920. Photograph mounted on linen. From construction photo album received by Buildings and Grounds

University of Michigan Library. Selden Breck Construction [West Stack]

West stack. Albert Kahn, architect. Selden Breck contractors built stacks 1916-1918. Construction of General Library Building authorized June 1916. Two stacks built at right angles to 1898 stacks, which were retained. In 1918 Old Library was demolished and front (north side) of General Library begun. Completed in 1920. Photograph mounted on linen. From construction photo album received by Buildings and Grounds

University of Michigan Library. Selden Breck Construction [East Stack]

East stack. Albert Kahn, architect. Selden Breck contractors built stacks 1916-1918. Construction of General Library Building authorized June 1916. Two stacks built at right angles to 1898 stacks, which were retained. In 1918 Old Library was demolished and front (north side) of General Library begun. Completed in 1920. Photograph mounted on linen. From construction photo album received by Buildings and Grounds

University of Michigan Library. Selden Breck Construction [West Stack]

West stack. Albert Kahn, architect. Selden Breck contractors built stacks 1916-1918. Construction of General Library Building authorized June 1916. Two stacks built at right angles to 1898 stacks, which were retained. In 1918 Old Library was demolished and front (north side) of General Library begun. Completed in 1920. Photograph mounted on linen. From construction photo album received by Buildings and Grounds

University of Michigan Library. Selden Breck Construction [East Stack]

East stack. Albert Kahn, architect. Selden Breck contractors built stacks 1916-1918. Construction of General Library Building authorized June 1916. Two stacks built at right angles to 1898 stacks, which were retained. In 1918 Old Library was demolished and front (north side) of General Library begun. Completed in 1920. Photograph mounted on linen. From construction photo album received by Buildings and Grounds

University of Michigan Library. Selden Breck Construction [West Stack]

West stack. Albert Kahn, architect. Selden Breck contractors built stacks 1916-1918. Construction of General Library Building authorized June 1916. Two stacks built at right angles to 1898 stacks, which were retained. In 1918 Old Library was demolished and front (north side) of General Library begun. Completed in 1920. Photograph mounted on linen. From construction photo album received by Buildings and Grounds

New telecommunications services : let's not stack the deck againist them.

"March 1988"-- P. [4].

Design of an X-band tray-type spatial power combiner using uniplanar quasi-Yagi antennas

The design of an X-band tray-type spatial power combiner, which employs uniplanar quasi-Yagi antennas (QYAs) for receiving and transmitting signals by individual amplifiers, is presented. Passive and active varieties of a seven-tray power-combining structure that includes two hard horns for uniform signal launching and combining across the tray stack are developed and measured. In order to compensate for nonuniform phase across the stack, which is caused by the nonplanar wave front of the horn antennas, Schiffman phase shifters are implemented in individual trays. The experimental-results show an improved performance of the investigated tray-type power combiner when the proposed phase-error compensation is implemented. (C) 2004 Wiley Periodicals, Inc.

Numerical evaluation of three dimensional effects in planar flow birefringence

The influence of three dimensional effects on isochromatic birefringence is evaluated for planar flows by means of numerical simulation. Two fluid models are investigated in channel and abrupt contraction geometries. In practice, the flows are confined by viewing windows, which alter the stresses along the optical path. The observed optical properties differ therefore from their counterpart in an ideal two-dimensional flow. To investigate the influence of these effects, the stress optical rule and the differential propagation Mueller matrix are used. The material parameters are selected so that a retardation of multiple orders is achieved, as is typical for highly birefringent melts. Errors due to three dimensional effects are mainly found on the symmetry plane, and increase significantly with the flow rate. Increasing the geometric aspect ratio improve the accuracy provided that the error on the retardation is less than one order. (C) 2004 Elsevier B.V. All rights reserved.

The design of planar gradient coils. Part ll: A weighted superposition method

In this work a superposition technique for designing gradient coils for the purpose of magnetic resonance imaging is outlined, which uses an optimized weight function superimposed upon an initial winding similar to that obtained from the target field method to generate the final wire winding. This work builds on the preliminary work performed in Part I on designing planar insertable gradient coils for high resolution imaging. The proposed superposition method for designing gradient coils results in coil patterns with relatively low inductances and the gradient coils can be used as inserts into existing magnetic resonance imaging hardware. The new scheme has the capacity to obtain images faster with more detail due to the deliver of greater magnetic held gradients. The proposed method for designing gradient coils is compared with a variant of the state-of-the-art target field method for planar gradient coils designs, and it is shown that the weighted superposition approach outperforms the well-known the classical method.

Investigations into a wideband spatial beamformer employing a rectangular array of planar monopoles

This paper presents a rectangular array antenna with a suitable signal-processing algorithm that is able to steer the beam in azimuth over a wide frequency band. In the previous approach, which was reported in the literature, an inverse discrete Fourier transform technique was proposed for obtaining the signal weighting coefficients. This approach was demonstrated for large arrays in which the physical parameters of the antenna elements were not considered. In this paper, a modified signal-weighting algorithm that works for arbitrary-size arrays is described. Its validity is demonstrated in examples of moderate-size arrays with real antenna elements. It is shown that in some cases, the original beam-forming algorithm fails, while the new algorithm is able to form the desired radiation pattern over a wide frequency band. The performance of the new algorithm is assessed for two cases when the mutual coupling between array elements is both neglected and taken into account.