Static frame

Figures 2 through 9 are design charts for ultraviolet stabilized polycarbonate under blast load. Charts are provided for pane thicknesses of 1/4, 3/8, 1/2, and 1 inch for pane areas up to 25 ft at pane aspect ratios (pane length to width ratios) of 1.00, 1.50, 2.00 and 4.00. The charts relate the peak experienced blast overpressure capacity, B, for convenient pane dimensions across the spectrum of encountered blast durations. Depending on the orientation of the window to the charge, the blast overpressure may either be incident or reflected. The pane dimensions (measured across the span from the gasket centerline) peak blast capacity at 1000 msec, B, static frame design pressure, r, and the required bite are printed to the right...

Let us turn again to Figure 19-6d and consider the situation w hen the signal goes to zero at Ihe end of the pulse. Now. however, it is useful to picture what is happening in the static frame of reference rather than the... 

Static frame. Syn. laboratory frame. The frame of reference corresponding to the physical world In which the experiment is carried out. 

Figure 2.4 illustrates the concept of the rotating frame. The rotating frame is distinct from the laboratory (static) frame. The rotating frame is a frame of reference we can use to view the net magnetization vector without having to worry about how it precesses at its Larmor (NMR) frequency (in this example 125 MHz). It is a second Cartesian (xyz) coordinate system in which the z-axis is stationary and parallel to the z-axis of the laboratory frame of reference, but in which the x- and y-axes remain perpendicular to each other (and to the z-axis) and rotate at the Larmor frequency in the laboratory frame s xy plane. The axes of the rotating frame are denoted x , /, and z. ... 

Cyclic Executive+Interrupts (frame initiation) 100% Easy - static frames... 

An overall view of the bending test is given in Figure 4. The panels were tested under actual conditions of support. This means that the specimen was hung at the four corners below a static frame with brackets and rods exactly as happens in practise. In fact two panels were tested for two different types of loading. 

As with all of the equipment we have discussed so far, these are all available in a wide range of materials. While the frames are generally constructed from a mild steel, as they do not come into contact with the process material, a wider range of materials are available for the loading chute. These can range from high quality stainless steels for food and pharmaceutical applications to lower grade mild steels for less arduous duties. The static frame noted above can be used in applications where frequent wash downs are required for sanitary purposes. 

As before, we note that the resonance frequency of a nucleus at position r is directly proportional to the combined applied static and gradient fields at that location. In a gradient G=G u, orthogonal to the slice selection gradient, the nuclei precess (in the usual frame rotating at coq) at a frequency ciD=y The observed signal therefore contains a component at this frequency witli an amplitude proportional to the local spin density. The total signal is of the fomi... 

Fluid statics, discussed in Sec. 10 of the Handbook in reference to pressure measurement, is the branch of fluid mechanics in which the fluid velocity is either zero or is uniform and constant relative to an inertial reference frame. With velocity gradients equal to zero, the momentum equation reduces to a simple expression for the pressure field, Vp = pg. Letting z be directed vertically upward, so that g, = —g where g is the gravitational acceleration (9.806 mVs), the pressure field is given by... 

The hierarchical structure of the frames defines the relation between them. This hierarchical structure is static, however, and cannot be easily modified. Inheritance is therefore an elegant way to represent taxonomical relations or well-established relations between objects. It is less suited for variables or ill-defined relations between objects. 

In order to combat this, the rotating frame Overhauser effect spectroscopy (ROESY) techniques can be employed. An in-depth discussion of how this technique works is outside the remit of this book but suffice to say, in the ROESY methods (1- and 2-D), NOE data is acquired as if in a weak r.f. field rather than in a large, static magnetic field and this assures that all NOEs are present and positive, irrespective of tumbling rate and magnet size. It is possible that some TOCSY correlations can break through in ROESY spectra but these will have opposite phase to the genuine ROESY correlations and so should therefore not be a problem - unless they should overlap accidentally with them. A 2-D ROESY spectrum of the naphthalene compound is shown below (Spectrum 8.6). 

Laboratory frame model A means of visualising the processes taking place in an NMR experiment by observing these processes at a distance, i.e., with a static coordinate system. See Rotating frame model. 

We consider particles of spin 1/2, mass m, and electric charge e in a fixed inertial frame. They shall be exposed to external electromagnetic fields that are static in the given frame,... 

Frame Loads. The window frame must develop the static design strength of the glass pane, r, given in Table II. Otherwise, the design is inconsistent with f rame assumptions, and the peak blast pressure capacity of the window assemblies will produce a failure rate in excess of the prescribed failure rate. This results... 

In addition to the load transferred to the frame by the glass, frame members must also resist the static design load, r, applied to all exposed members. Maximum allowable limits for frame design... 

The braced frame must develop the ultimate capacity of the members which it supports, namely the girts and end wall columns. The force applied to the top of the column is equal to the tributary area times the resistance as a static load. Each braced frame will be designed to resist the entire load even though there will be a frame at each end of the building. This will provide redundancy and will eliminate large axial forces in the top perimeter beams at the interior frames. 

Most blast door manufacturers opt to perform static load tests on prototype assemblies of low-range blast doors to demonstrate that the assembly will resist the blast overpressure specified. Static tests should be accepted only if the dynamic structural response and dynamic load factors have been considered and the door, frame, and restraining hardware are manufactured using the same materials, dimensions, and tolerances as those in the prototype static test. 

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