Aperture closed

When the burner has a single aperture of the diameter of a bristle, a simple jet is produced in the form of a long, thin, conical flame. The bat a-wing, or flattened flame, which the gae forme when it issues from a narrow slit, instead of s round aperture, is muah more appropriate. A similar and equally good flame is produced by a burner with two apertures close to each other, the channels of which are inclined inwards, eo that both the currents of gas cross each other at the base. They then fora a flat flame spreading out in the form of an inverted triangle, and the burner is called a. fish or swallow-tail ... 

The bi eech-loading is on Krupp s patent plan. The shot or shell is rais id by a block and fall, and is rolled into the side of the" breech through an aperture closed by a slide. 

An argon laser with resonator length d = 100 cm and two mirrors with radius ri = oo and r2 = 400 cm has an intracavity circular aperture close to the spherical mirror to prevent oscillation on transversal modes. Estimate the maximum diameter of the aperture that introduces losses yaiffr < 1% for the TEMqo mode, but prevents oscillation of higher transverse modes, which without the aperture have a net gain of 10%. 

By using absolute probes with selective resolution, the distortions caused by the probe (probe aperture) could be minimized. This results in images which come very close to the actual physical conditions. 

Fit the central neck of a 1-litre three-necked flask with an efficient double surface condenser and close the two side necks with corks (1). Place 52 g. (59-5 ml.) of ethyl n-valerate (Section 111,104) and 800 ml. of super-diy ethyl alcohol (Section 11,47, 5) (2) in the flask. Add 95 g. of clean sodium in small pieces through one of the apertures at such... 

The data for a plot like Fig. 18-60 are easily obtained from a screen analysis of the total crystal content of a known volume (e.g., a liter) of magma. The analysis is made with a closely spaced set of testing sieves, as discussed in Sec. 19, Table 19-6, the cumulative number of particles smaller than each sieve in the nest being plotted against the aperture dimension of that sieve. The fraction retained on each sieve is weighed, and the mass is converted to the equivalent number of particles by dividing by the calculated mass of a particle whose dimension is the arithmetic mean of the mesh sizes of the sieve on which it is retained and the sieve immediately above it. 

Starting of the fan when the serviced aperture is opened and when the air temperature near the closed aperture deviates from a set value... 

It gives the crossover between diffraction-limited and turbulence-limited resolution. For aperture diameters smaller than ro, close to diffraction limited imaging is possible without phase correction, for aperture diameters larger than ro, the resolution is limited by the turbulence. For a circular aperture of diameter D, the phase variance over the aperture is... 

Figure 9.2 illustrates a typical example of normalized transmittance, T(z), of CdTe QDs against the sample position z from the focusing point vdth and vithout aperture [17]. Since the peak ofthe normalized transmittance for the closed aperture precedes the valley, the sign ofthe nonlinear refractive index of CdTe QDs is negative. 

Figure 9.2 Normalized transmittance measured by the Z-scan with and without the collecting aperture for CdTe QDs with the diameter of 4.1 nm excited at 803 nm (0.4 pj pulse ). The open aperture Z-scan corresponds to the nonlinear absorption and the closed aperture Z-scan to the nonlinear refractive index.

Fig. 9 Schematic of simplified Z-scan setup, and examples of open- and closed-aperture measurements of the common reference materials zinc sulfide (ZnS) and carbon disulfide (CS2) with fitting using the theory proposed by [66]...

---