Microstructuring of 3D movie theater metallic screens to improve radiant intensity homogeneity and reduce crosstalk.

We present analytical and experimental results of the microstructuring of movie theater metallic screens. Our objective is to maintain the polarization state of reflected light and to control the distribution of light intensity avoiding hotspots. We derive analytical solutions of surface functions with an axial symmetry (kernel) that produces isotropic and Lambertian scattering.

Involvement of cyan and ester groups in surface interactions of aerosil-cyanophenyl alkyl benzoate systems with high silica density: Infrared investigations.

Composites prepared from aerosil A380 and liquid crystals (LCs) of 4-n-alkyl-4'-cyanophenyl benzoate type, with four to six carbon atoms in the alkyl chain were investigated by infrared spectroscopy. Their high silica content (of 2-7 g aerosil/1 g of LC) was given by thermogravimetric investigations and allows the observation of a rather thin LC layer on the silica particles. Several surface species onto the external surface of the grains were demonstrated.

Composites containing confined n-octyl-cyanobiphenyl: monomer and dimer species in the surface layer by in situ FTIR spectroscopy.

Confinement of 4-n-octyl-4'-cyanobiphenyl (8CB) to nanoporous molecular sieves with hexagonal structure of cylindrical pores (4.6nm diameter) is studied. Thermogravimetric investigations have indicated that the pores are completely filled.

The complex phase behaviour of suspensions of goethite (alpha-FeOOH) nanorods in a magnetic field.

In 1902, Majorana reported the magneto-optical properties of aqueous colloidal suspensions of mixed iron oxides. Oddly enough, the magnetic-field induced birefringence displayed a non-monotonic dependence upon field intensity. This behaviour was later interpreted as due to the existence in these sols of at least two different chemical species.

Physical properties of aqueous suspensions of goethite (alpha-FeOOH) nanorods. Part II: In the nematic phase.

At volume fractions larger than 8.5%, aqueous suspensions of lath-like goethite (alpha-FeOOH) nanorods form a lyotropic nematic phase. In this article, we first discuss the nematic ordering within statistical-physics models of the isotropic/nematic phase transition.

[The use of viscoelastic compounds in cataract surgery].

The viscoelastic substances are very useful generally in cataract surgery, but absolutely useful in phacoemulsification. In present is used for viscoelastic compounds two terms that assemble the rheologic and physics-chemical properties: is said about the viscoelastic substance that is cohesive and dispersive (respective cohesivity or dispersivity property). Thus both types of viscoelastic substances--cohesive and dispersive--is used, sequentially, in one system.

[Cataract and the exfoliative syndrome].

Exfoliation syndrome is more frequently in the older age and represents a risk factor for cataract surgery. This paper presents the results of a clinical trial made on 436 patients with troubles of transparency of the lens who were investigate in our clinic during January 1995-January 1997, and in whom, clinic and paraclinic exams have not revealed any associated ocular disease. In 14% of these patients who presented troubles of transparency of the lens were found uni- or bilateral exfoliation.

[The ocular manifestations in rheumatic diseases in young adults].

The paper presents the ocular clinical manifestations and its immunopathology in the main rheumatic diseases. The study shows that the most frequent ocular involvement in ankylosing spondylitis is anterior uveitis and HLA-B27 + uveitis are more severe, with a longer evolution and more frequent complications.

Dermatoglyphics in thyroid cancer.

Digito-palmar dermatoglyphics in 93 subjects with thyroid cancer (34 males, 59 females) of which 87.1% had folliculo-papillar adenocarcinoma were studied qualitatively and quantitatively. The findings were compared to the dermatoglyphics of 100 males and 100 females from the clinically healthy autochthonous population.

Considerations on some anatomo-clinical phenomena of thyroid cancer. Treatment and prognosis. Personal experience with 1515 operated cases.

The authors present a retrospective study on 1515 histologically confirmed cases of thyroid cancer encountered along a period of 30 years of activity. These cases were found among 15,200 patients operated on for thyroid disorders. Of these 1515 cases, 1310 were differentiated carcinomas of the follicular, papillary or trabecular type, 156 nondifferentiated carcinomas and 49 medullary carcinomas.

Surgical indications in endemic goiter. Pre- and postoperative care.

The authors express their opinion with respect to anatomo-clinical forms of endemic goiter. First they suggest preoperative thyroid re-equilibration to avoid postoperative complications such as hypothyroidism or recurrence. Then operative indications for endocrine goiter, especially in an endemic area are discussed.

The thyroglobulin variations during the thyroid surgery for polynodular goiter, hyperthyroidism and cancer.

A radioimmunoassay (RIA) double antibody system for human thyroglobulin (Tgl) was developed with a sensitivity of 2.5 ng/ml T3 and T4 did not interfere in the antibody Tgl binding. The blood was collected pre-, intra- and 24 hrs post-thyroidectomy from 50 females and 4 males diagnosed as polynodular goiter, hyperthyroidism, chronic thyroiditis and thyroid cancer.