Meniscus sign

Fig. 1.45. Meniscus sign. Plain radiograph shows the meniscus sign a rounded soft-tissue mass (the intussusceptum) protruding into the gas-filled transverse colon (arrow) [From del Pozo (1999)]...

Fig. 1.54a,b. Air enema therapy, a Image obtained at the beginning of an air enema study shows the meniscus sign and a mass in the middle of the upper abdomen, b Image obtained after complete reduction shows gas passing freely into the small intestine [From del Pozo (1999)]... 

Historically, the AXR has been the first investigation in children presenting with suspected intussusception. The most frequent plain film findings are those of reduced large bowel gas and the presence of a mass (Fig. 6.6) (Ratcliffe et al. 1993). Other signs include the meniscus sign and the... 

Fig. 5.5a,b. Malignant lesser curve ulcers a double-contrast barium meal study shows a malignant lesser curve ulcer. Note the nodular margin and amputated radiating mucosal folds, b Carman meniscus sign (arrow) in a different patient with malignant lesser curve ulcer... 

Figure 2.7 (A) A gas bubble in liquid and a drop in a gaseous environment. (B) A liquid meniscus with radii of curvature of opposite sign between two solid cylinders.

A saddle-shaped meniscus (or pendular ring) is developed in the first stage of condensation. Application of Equation (7.10) now requires the designation of two radii of curvature of opposite sign, one being concave and the other convex. The Kelvin equation therefore takes the form... 

Therefore, when Ay < 0 is fulfilled everywhere in the transition region between the film and the meniscus, then, in accordance with Eq. (3.55), K< 0. However, if in the transition zone there exist thicknesses with Ay> 0, the positive values of the line tension are not excluded (for more details on the line tension and its sign, see [26,27]). 

We repeat that all these c s are positive if the radii are on the concave side of the meniscus, as in fig. 1.3 otherwise a minus sign Is needed. 

An interesting phenomenon based on capillarity is the appearance of a capillary attractive force between particles of moistened solids. As a result of wetting, a meniscus is formed upon the particle contact (Fig. 1-14). This meniscus between two contacting particles of radii r0 has a shape of surface of rotation, and can be characterized at each point by the two curvature radii r, and r2 (in Fig. 1-14, a these radii are of opposite sign, i.e. r,>0 and r2<0), which are related to each other as 1/r, + /r2 = const. If r, r0, both rx and r2 may be considered to be constant. 

Magnussen RA, Mansour AA, Carey JL, Spindler KP (2009) Meniscus status at anterior cruciate ligament reconstmction associated with radiographic signs of osteoarthritis at 5- to 10-year follow-up a systematic review. J Knee Surg 22 347-357... 

The charges, with the signs opposite to the sign of the electric potential applied to the MS inlet, accumulate on the liquid meniscus at the capillary outlet. This process is followed by the formation of a Taylor cone and Coulomb explosions which lead to the formation of fine droplets. The mechanism responsible for generation of charged droplets and ions in Pl-ESI appears to be similar to that found in the conventional ESI process (Section 2.4). 

In a similar manner, the effect of reverse mass exchange in the case of advancing meniscus when the latter meets a wetting film (Fig. 5b) may be considered. The derived equation, because of adopted reversibility of the mass exchange, differs from Eq. (9) only by the sign of the term in parentheses ... 

The results obtained are shown in Fig. 11. The 5(t) functions shown in Fig. 11a are linear at all values ofthe pressure drop, from + 145 to —190 mmHg. It should be noted that the sign of AP values depends on absolute values of Pi and P2 (Fig. 1). In the case of advancing motion on water meniscus AP values are positive, and in the case of receding motion are negative. 

Equation (18) can also be applied to the meniscus under a horizontal plate shown in Fig. 4. It is noted that in Eq. (18), we neglect the contribution from the liquid in a trough of small roughness with higher order than AS. The energy AEw is dependent on the direction of contact line movement (i.e., the sign of AS), as stated by Eq. (10). The values of AUw for liquid advancement and retreat are again written here as... 

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