Tricking filter

As the 21st century progresses, the bulk of e-mails will be meaningless. Already, many subject lines convey no meaning at all in order to avoid and trick spam filters that are designed to eliminate traditional spam. Thus, crazy, unpredictable subject lines like visual, rhododendron, purveyor, noodle are becoming common, although I wonder how many people really open these mails. If you do open them, the mails get even harder to decipher, and we see ... 

Many tricks have been applied (trim pulses, z filters, gradients, etc.) to remove these antiphase terms, leaving only the pure phase Ia and Ib terms (Fig. 9.43, right). For example, a z filter is a 90 — A — 90° sequence that puts the desired magnetization on the z axis and then allows a bit of evolution to occur for the undesired terms ... 

This paper is organized as follows. Sec. 2 provides the background to the kernel-based learning methods and kernel trick. Sec. 3 introduces a linear matched subspace and its kernel version. The orthogonal subspace detector is defined in Sec. 4 as well as its kernel version. In Sec. 5 we describe the conventional spectral matched filter ad its kernel version in the feature space and reformulate the expression in terms of the kernel function using the kernel trick. Finally, in Sec. 6 the adaptive subspace detector and its kernel version are introduced. Performance comparison between the conventional and the kernel versions of these algorithms is provided in Sec. 7 and conclusions are given in Sec. 8. 

The most important trick in filtration is always to wait until the solids have settled as much as possible and to filter the clear solution first. Then the remaining turbid part can be filtered. This often saves time, especially when precipitates are very fine. 

The locus taken by the roots of the characteristic differential equation of the load cell as the applied mass changes can be determined by automatic system identification techniques. Such a locus is illustrated in Fig. 7.5, and the roots of the compensating filter need to follow it. For each value of mass there is a corresponding final output of the compensating filter once oscillation has ceased. The trick is to make the parameters of the filter vary with its own output as dictated by the locus. 

The trick is to produce conditions at the surface that favour these reactions even though the solution pH is chosen to minimise it. In the case of glass fibre and some fillers, the surface may be sufficiently alkaline to accomplish this. In other cases a two-step process has to be resorted to in which a filler slurry is first produced in the acidic solution which is then made alkaline before the filler is filtered and dried. Thermal treatment is also used to drive the condensation reaction. 

The trick to successful filter operation is always to filler 10% of the circulating amine. In practice, two filters are piped up in parallel. When one filter cannot pass 10% of the flow without exceeding 50-psi pressure drop, switch filters. Then immediately change the paper in the spent filter. 

A simple recalibration of the reboiler temperature controller rectified this problem. Incidentally, operating a triethylene glycol reboiler at 375°F-400°F does not necessarily result in a noticeable increase in glycol degradation. The trick is to keep the glycol filters in good repair. Dirty glycol fouls the reboiler heat-transfer tube. This in turn causes hot spots on the heat-transfer surface, which accelerates thermal decomposition. 

The trick is to induce the emission of secondary ions from a smooth sample surface within some time interval so that the flight time can be measured. This can be accomplished one of two ways, i.e. by pulsing of the primary ion beam or by pulsing the secondary ion beam. These ions are then accelerated to between 2 and 8 keV before entering the Time of Fhght mass filter. 

Perhaps every reader realizes that our past experiences influence our present perceptions. In Chapter 3, we considered shifts in methods and perceptions needed to achieve a Total Safety Culture. When I give workshops on paradigm shifts, someone invariably expresses concern about resistance. "He (or she) keeps playing old tapes and is not open to new ideas," is a common refrain. Past experiences are biasing present perceptions. Actually, there is a long trail of intertwined factors here. Past experiences filter through a personal evaluation process that is influenced by person factors, including many past perceived experiences. The cumulative collection of these previous perceived experiences biases every new experience and makes it indeed difficult to "teach an old dog new tricks."... 

The work done at Oak Ridge developed over more than a decade and results with powdered-metal replacements for lead have gradually filtered into the commercial world. Today there is plenty of ammo based on nonlead bullets and even some with fully non-toxic primers. One of the tricks is to adjust the powder weight and style so that velocity and chamber pressures are safe and yet sufficient The Oak Ridge scientists felt that their new bullet performance was consistent with performance of lead-based ammo. 

---