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PACS. 64.70M -Transitions in liquid crystals. PACS. 61.25H -Macromolecular and polymer solutions (solubility, swelling, etc.); polymer PACS. 68.42 -Surface phase transitions and critical phenomena. melts.Abstract. -The confinement of, liquid crystalline polymers dissolved in a nematic solvent is analysed using a mean-field theory. For homeotropic anchoring the confinement triggers a tilting phase transition. The transition is reminiscent of the Frederiks transition, however it may be either first or second order.

We present a simple experiment in which the transmission of a laser beam through a sample is modulated by a second laser. The effect is explained on the basis of impurity absorption and the concomitant changes of electron populations at the impurity levels.

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The surgical properties of pulsed 0.53 m Nd:YAG laser have been investigated. The tissues of genitals have been treated with 0.53 mm laser beam and investigated microscopically, injury dept to width ratio was established. The spectrophotometry ofthe same tissues was performed and optical densities were compared. The advantages of 0.53 jtm, 1.06 .tm, 1.32 tm Nd:YAG lasers using for gynecological