Suchergebnisse

1 Glass Formation -- 1.1 General Aspects -- 1.2 Glass Formers -- 1.3 Atomistic Hypotheses of Glass Formation -- 1.4 Kinetic Approach to Glass Formation -- 2 Phase Transformations in Glass -- 2.1 Crystallization -- 2.2 Liquid -Liquid Phase Separation -- 2.3 Glass-Ceramics -- 3 Physical Properties -- 3.1 Density of Glasses -- 3.2 Partial Molar Volume of Constituent Oxides in Glasses and Melts -- 3.3 Refractive Index of Glasses -- 3.4 Thermal Expansion of Glasses -- 3.5 Viscosity of Glasses -- 3.6 Surface Tension of Glasses -- 3.7 Electrical Properties of Glasses -- 4 Chemical Durability of Glass -- 4.1 Mechanism of Reactions of Glasses with Aqueous Solution -- 4.2 Factors Affecting Chemical Durability Measurements of a Glass -- 4.3 Effect of Glass Composition -- 4.4 Effect of pH of the Solution on Chemical Durability of SiO2 (quartz) -- 4.5 Solubility of Silica in Aqueous Solutions -- 4.6 Glass Electrodes -- 5 Oxidation-Reduction Equilibrium in Glass -- 5.1 General -- 5.2 Activity Corrections -- 5.3 Oxidation -Reduction in Glass -- 5.4 Theory of Redox Reactions in Solutions -- 6 Acid-Base Concepts in Glass -- 6.1 Introduction -- 6.2 Acid-Base Relationships in Glasses -- 6.3 Oxygen Ion Activity -- 6.4 Transition Metal Ions as Acid-Base Indicators in Glass -- 6.5 Oxidation-Reduction Equilibrium in Glass -- 6.6 Filled Shell Ions with ns2 Configuration as an Acid-Base Indicator in Glass -- 6.7 Vanadylion as an Acid-Base Indicator in Glass -- 7 Coloured Glasses -- 7.1 Atomic Structure and the Periodic Classification of Transition Metals -- 7.2 Theories of Chemical Bonding in Transition Metal Complexes -- 7.3 Application of Bonding Theories in Interpreting d-d Absorption Spectra -- 7.4 Absorption Spectra of Transition Metal Ions -- 7.5 Charge-Transfer Bands -- 7.6 Anionic Substitution in Glass -- 7.7 Photosensitive Glasses -- 7.8 Copper Ruby Glasses -- 7.9 Measurement of Colour, Colour Diagram and Tristimulus Values -- 8 Polymetric Nature of Glass Melts.

Mosaics are perhaps the most outstanding examples of Byzantine art which survive, yet we know next to nothing about how they were made. Glass-making was a relatively sophisticated skill in the mediaeval world, yet no written documents survive from Byzantium about the methods used for making a mosaic or creating its tesserae, and we have no knowledge of the ways in which manufacturing patterns existed and changed over time, or, indeed, of where and exactly how tesserae were created. Only the mosaics themselves speak to their composition. Glass making and glass working were two distinct processes: did the differently coloured glass tesserae on one site all come from the same batch of raw glass? Where did that raw glass come from? The nature of the actual colours used in making mosaics changed over time: is this simply a question of changing aesthetics or are there also technical explanations for these alterations? In discussing questions like these, the volume explores issues around the technical production of glass and medieval artistic practices, whilst also opening up wider debates about the nature of trade and exchange within the Mediterranean during this period and into our understanding of political and social changes within the Mediterranean world. The volume cuts across art history, archaeology, chemistry, physics and Byzantine studies, bringing together a range of scholars from Europe and America interested in the chemical and physical analysis of Byzantine glass together with those concerned with the formal and cultural aspects of Byzantine mosaics in order to reappraise mosaics and mosaic making in this interdisciplinary context.

One: Directory Section -- Glass Fibre Materials for the Composites Industry -- Glass Fibre Materials Other Than for the Composites Industry -- Optical Fibres & Cables -- Two: Data Section -- Section 1: Continuous Filament Yarns -- Glass Fibre Materials for the Composites Industry -- Section 2: Reinforcements for Thermosets -- Section 3: Reinforcements for Thermoplastics -- Section 4: Reinforcements for Cement & Gypsum -- Section 5: Tissues, Surfacing Veils, Mats & Fabrics -- Glass Fibre Materials Other Than for the Composites Industry -- Section 6: Filtration Materials -- Section 7: Insulation Materials -- Section 8: Glass Fibre Fabrics for Printed Circuit Boards -- Section 9: Miscellaneous Materials -- Materials for the Optical Fibre Industry -- Section 10: Fibres -- Section 11: Fibre Cables -- Section 12: Optical Fibre Cable Support Members -- Late Entries -- Index to Advertisers.

'WHEN I USE A WORD IT MEANS EXACTLY WHAT I WANT IT TO MEAN,' SAYS HUMPTY DUMPTY TO ALICE IN THROUGH THE LOOKING-GLASS. WHICH IS MORE OR LESS WHERE WE ARE WITH THE US AND ITS INTERPRETATION OF INTERNATIONAL LAW

The UK Association of University Teachers conducted a 2000/01 survey of staff in six British universities to determine the experience of lesbian, gay and bisexual (LGB) employees holding academic and non‐academic appointments. We analyse the salaries and ranks held by LGB individuals, guided by a new model of the interaction of 'tastes for discrimination' and the decision to 'come out'. We find no evidence that LGB staff suffer any disadvantage in salaries relative to heterosexuals. We do find evidence that gay/bisexual men suffer from glass ceilings comparable to those faced by heterosexual women.

Does wearing glasses hurt or help politicians in elections? Although some research shows that glasses signal unattractiveness, glasses also increase perceptions of competence. In eight studies, participants voted for politicians wearing (photoshopped) glasses or not. Wearing glasses increased politicians' electoral success in the US (Study 1). independent of their political orientation (Studies 2a and 2b). This positive effect was especially strong when intelligence was important (Study 3), and even occurred if glasses were used strategically (Study 4). However, it did not extend to India (Study 5) due to different cultural associations with glasses (Study 6). Furthermore, while intelligence mediated the effect, warmth did not (Study 7). In summary, wearing glasses can robustly boost electoral success, at least in Western cultures.

Life Under Glass tells the fascinating story of four men and four women who lived and worked inside the Biosphere 2 structure, where they recycled their air, water, food, and wastes, setting a world record for time spent in a closed ecological system. This is the only account written during the unprecedented experiment while the team was enclosed inside.

I shall discuss some of the practical legal problems we have encountered in our efforts to trade with the Soviet Union and the Eastern European countries. I should like to say at the outset that ever since I began to work in this field in 1964, the U.S. Government has been very helpful. Within the framework of congressional export policy, the Department of Commerce has always endeavored to make allowance for the needs of the American businessman. The State Department has also been helpful; I recall in particular a really first-rate briefing by our embassy in Bucharest when East-West trade was a very new subject.