Suchergebnisse

In April 1962 the Alberta Government passed legislation permitting a pharmacist to substitute drugs on a written medical prescription unless the doctor indicated otherwise. The intent was stated to be in the interests of cheaper drugs for the people of Alberta. The legality of this legislature has been questioned in Federal courts of law. The legislation has been formally criticized by the official representatives of medicine and pharmacy on the ground that indiscriminate substitution of drugs is not in the public interest until such time as the quality of all available drugs is assured by governmental or other authoritative agency. It is not within the function of the Food and Drug Directorate to guarantee the quality of drugs sold in Canada, this assurance normally being provided in the trade mark adopted by the manufacturer.

1 Perspective and overview -- 1.1 Introduction -- 1.2 Optical fibre fundamentals -- 1.3 Loss mechanisms in optical fibre materials -- 1.4 Long wavelength fibre materials -- 1.5 Fluoride glasses and optical fibres -- 1.6 Applications for infrared optical fibres -- 1.7 Future prospects -- References -- 2 Properties of fluoride glasses -- 2.1 Introduction -- 2.2 Glass-forming systems, structure and crystallization -- 2.3 Thermal properties -- 2.4 Other properties -- 2.5 Optical properties -- References -- 3 Propagation in optical fibres -- 3.1 Introduction -- 3.2 Multimode fibres -- 3.3 Monomode fibres -- References -- 4 Manufacture of infrared fibres -- 4.1 Materials preparation -- 4.2 Melting techniques -- 4.3 Fibre fabrication -- 4.4 Problems -- 4.5 Fibre results -- References -- 5 Intrinsic loss measurements -- 5.1 Introduction -- 5.2 Rayleigh scattering -- 5.3 IR multiphonon edge -- 5.4 Minimum intrinsic loss -- 5.5 Longer wavelength transmitting fibres -- References -- 6 Extrinsic absorption -- 6.1 Introduction -- 6.2 Spectrometer measurements -- 6.3 Absorption due to water -- 6.4 Absorption due to transition metal ions -- 6.5 Absorption due to rare earth ions -- 6.6 Other impurities -- References -- 7 Extrinsic scattering -- 7.1 Introduction -- 7.2 Identification of scattering centres -- 7.3 Scattering theory -- 7.4 Scattering solutions for limiting cases -- 7.5 Solutions for metallic (absorbing) spheres -- 7.6 Applications to practical examples -- 7.7 Calculations of scattering loss -- 7.8 Scattering loss in fibres -- 7.9 Conclusions -- References -- 8 Measured losses in fibres -- 8.1 Introduction -- 8.2 Available techniques -- 8.3 Total loss -- 8.4 Absorption -- 8.5 Scattering -- 8.6 Recent results -- 8.7 Predicted minimum loss -- References -- 9 Mechanical properties -- 9.1 Introduction -- 9.2 Fracture and glass parameters -- 9.3 Strength measuring methods -- 9.4 Fibre strengths -- 9.5 Identification of flaws and effect on strength -- 9.6 Ultimate strength and maximum practical strength -- 9.7 Strength and homogeneous crystal growth -- 9.8 Durability -- 9.9 Conclusions -- References -- 10 Applications -- 10.1 Mid-IR communication systems -- 10.2 Active fibres -- 10.3 Laser surgery -- 10.4 Infrared fibre sensors -- References.