Head field

Switching-Field Distribution. Both and have a strong relation with the recording process. determines the maximum output signal of a recording medium and hence the signal-to-noise ratio. ascertains how easily data can be recorded and erased or changed, but it also determines the maximum head field. On the other hand it also controls the ease with which data can be destroyed, eg, by stray fields. The lower the the more sensitive the medium is to all kinds of fields. In this way, influences the noise level as well. The squareness ratio S (= /Af ) can also be derived from the... 

Figure 7. Head field strength as a function of time for different Gilbert damping constants within the head. The dashed line gives the current profile The solid lines give the head field for a= 1, 0.5, 0.1, and 0.02. The fastest field rise time is achieved with intermediate damping (a= 0.5).

Specifications for a probe head/field strength (magnet) combination are given by the spectrometer manufacturer for line shape, sensitivity, resolution, and radio-frequency field strengths. A specific test is considered passed when the specification value is met. 

Recall from Eq. (2) that the dispersion matrix depends on velocity. Thus, for the first and second terms on the right-hand-side of Eq. (18), the groundwater average linear velocity vector (which was assumed steady in time) must be determined. This is accomplished in two-steps. In the first step, the distribution of hydraulic heads must be determined in order to calculate the hydraulic gradient, for use in Eq. (1). For steady flow, the head field must satisfy Laplace s equation that is... 

For each hydraulic conductivity field generated, the associated variable hydraulic head field and groundwater velocity field were determined. Each variable hydraulic head field was evaluated numerically by solving the following steady state two-dimensional groundwater flow equation for a heterogeneous confined aquifer [50] ... 

Fig. 8.7 Head model of (a) CF-SPT head and (b) conventional SPT head, (c) Comparison of head field for the CF-SPT head and conventional heads with various coil recessions...

Fig. 8.11 (a) Structure of shielded CF-SPT head, (b) Comparison of head field between shielded and normal CF-SPT head... 

Fig. 8.12 Effect of (a) shield gap length and (b) shield height on head field strength and gradient...

Fig. 8.14 Head field as a function of base core size, and Tm, for tapered and stepped main poles. Head field is normalized by saturation magnetization...

Fig. 8.15 (a) Variation of pole tip structure Type / - tapered structure in both down and cross track directions Type //-tapered only in the down track direction Type III-no tapered structure, (b) Comparison of head fields for tapered main poles of various types... 

The shift margin is wider than that obtained for Karlqvist type head field in both directions. The elongation effect of dots to increase the shift margin in the cross track direction has also been verified for the multisurface head with side shields. 

Philip, R. D. Walter, G. R. Prediction of Flow and Hydraulic Head Fields for Vertical Recirculation Wells. Ground Water 1992.30 (5), 765-773. 

During the Ph.D. studies of Menschik (ongoing) an add on (Fig. 44.2) for the integration of drill head field testing data (performance and wear) and data of the test sites (quarries and mines distributed over the world) is being developed. This module allows easy correlation of rock mechanical properties with performance and wear data of the drill equipment. 

MH or the MeSH heading field contains terms from NIM s Medical Subject Headings (MeSH) controlled vocabulary. There are approximately 4,000 CHQfLINE records with MeSH headings. 

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