Found inside – Page 142The oven contains electric heating ele- clined output shaft of a worm - geared speed ... DESCRIPTORS : * Industrial equipment , Cements , * Quartz crystals ... Found inside – Page 376Berg, S., Ruths, M., Johannsmann, D.: Quartz crystal resonators with atomically ... F.C.: Real-time monitoring of catalytic surfaces using a mass/heat flow ... Found inside – Page 1675A heat - pipe oven has been used to contain and control the nemiluminescent ... Key words : crystal controlled oscillator ; fast linewidth ; quartz crystal ... Found inside – Page 2769... to fusion by heating as a starting material to 1. A method for growing large silicon carbide single crystals , prepare high - purity quartz glass ... Found inside – Page 1Cherish each moment with your little one with this go-to guide that explains all the many benefits of crystals. Found insideA much more active industry in Brazil is the creation of citrine, ranging in hue from light yellow to rich orange, by heating other varieties of quartz; ... Found inside – Page 204The points on Another reason for the breaking up of the surface of the left crystal will move , if rocks by heat is the difference in the both crystals be heated , almost twice as OL TOO Wolframite Quartz 100 Fig . 9 . FIG . 10 . expansions of ... Found inside – Page 44Improved cultured quartz is a result of many changes in crystal growing processes . At Western Electric , temperature and atmosphere controlled autoclaves are employed ( see Fig . 1 ) . In an autoclave , the temperature hovers around 750 ° F ... Found inside – Page 68The effect of compressive deformations already appears in the course of heat treatment of quartz. Whereas crystal quartz free of structural defects is ... Found inside – Page 148Crystals were heated in a vacuum oven designed to fit in the magnet pole gap, ... with a ceramic Oven in air, still with fused quartz crystal support. Found inside – Page 75of the quartz crystal was calculated for the condensation of 100 nm of zinc, ... The heat of condensation for a 100 nm thickness of each film is 0.009, ... C. stepwise with a .DELTA. T of 0.25.degree.-3.degree. C., increasing the .DELTA. T to about 50.degree. C. after the fused quartz has crystallized, and maintaining these conditions until crystal growth in the upper zone is completed. Optical absorption, electron paramagnetic resonance absorption, and thermoluminescence have been measured in germanium-doped quartz crystals which have been x-irradiated at room temperature and subsequently heated. Found inside – Page 139Also, beware of opalite and pineapple quartz. These are glass stones that look opalescent ... Heating crystals in a lab is another way to enhance the color. Quartz crystals were grown by the hydrothermal method in NaOH solutions. Rates of growth in the AT and Z directions were measured for undoped and doped quartz (Mg(2+), Ga(3+), V(5+)), using various temperature gradients. Found inside – Page 104Preparation of synthetic quartz . · Nature , London , 1946 , vol . 157 , p . 297 . Silica - glass heated in a solution of Na Siog is mainly converted into very small well - shaped crystals of quartz . On a seed crystal with a suitable mineralizer growth ... Found inside – Page 235Quartz crystals melt at about 1500°. If the molten mass be cooled, it becomes an amorphous, transparent substance, of valuable physical properties (Art. 155). Quartz glass, or fused quartz, is therefore nothing but supercooled liquid quartz. Found inside – Page 207Other stones that react to heat are : violet quartz ( amethyst ) changing to orange brown , smoky quartz to yellow , pale - green beryl to blue , violet ... Found inside – Page 107A sheet of solvent element A is placed between a seed crystal, B, ... Spezia” showed that it was possible to produce quartz crystals by heating quartz ... Found inside – Page 463quartz and fluor spar , caused the hand to follow them . When placed in the hand , it was spasmodically contracted , and became rigid . April 13.— A rock crystal , two inches long and half an inch thick , was convulsively grasped in the hand ... Found inside – Page 52Experience shows, however, that rare-earth-rich melts cannot be heated directly in quartz glass. In a majority of cases, one needs to contain the melt in an ... Found inside – Page 10[7] have used a quartz crystal for non-isothermal TG by using a computer to record and ... including arrangements for heating the crystal plus sample, ... Found inside – Page 105Some pink quartz may be intensified by irradiation and heat-bleached stones may have their colour restored. Much blue quartz gets its colour from ... Found inside – Page 76The crystal - electricity , as excited in tourmaline and other minerals by heat , does not exhibit any ... Whoever has seen a nucleated mass of quartz crystals broken into , in a mine , and noticed how they stand in all directions , cannot have ... Found inside – Page 185alle If the crystal is biaxial , all three axes of the ellipsoidal isothermal surfaces differ in magnitude . As may be ... De Senarmont ' s method faces in quartz for the case yields only relative results . of a point source of heat in a crystal in planes ( A ) ... Found inside – Page 60M - 310 heating : prefabricated .. 353 MSMN 80 Quartz crystal filters .--580 PLUM 50 Radiator enclosures and fronts : 353 MSMN 80 Quartz crystal oscillator ... Found inside – Page 55The higher the drive level the greater the heat. Intuitively, we know that heat is an aging catalyst, which is the case for a quartz crystal resonator. Found inside – Page 248On the Change of State of Quartz at 570 ° . 0. MÜGGE . Königsberg Neues Jahrb . Min . Geol . , Festband , 1907 , 181-96 ; plate . - At 570 ° quartz crystals suffer a change of state and pass , on heating , from the lower a - quartz into the higher B ... Found inside – Page 224Heat treated smoky quartz is often misnomerd as smoky topaz. Cut as gems. -> Burnt Smoky quartz. heat treated stone; certain rough gemstones improved or ... Found inside – Page 621The reaction may be subdivided into three inversion steps , the distances of which ( AU ) depend on the heating rate ; AU1-2 is only 0.1 C .; AU 2–3 , 007 C. The previous heat treatment is of influence : primary B - quartz crystals which had ... Found inside – Page 172Most substances conduct heat equally well in all directions through their mass , but some crystals and organized structures conduct heat more readily in some directions than in others . Thus , if a plate be cut from a quartz crystal parallel to its ... Found inside – Page 281The heating was carried out at a constant rate of 2 deg / min . Among the great variety of forms of natural single The sample was excited with 150 kv x - rays , using an crystals of quartz some are found with a smoky or violet anode current of 10 ... Found insideAccess Your Inner Wisdom Through the Power of Crystals If you're intrigued by the power of crystals and gemstones but still wonder how to use them for real life change, this book will show you how! Found inside – Page 37The reason for the loss of the lamellar structures is unknown but might reflect the release of strain in the crystals during heating. 4. Found inside – Page 4Judging from the impressions of small crystals of quartz , mica and cryolite on the cavity walls in the topaz , the deposition of ... Using the usual heating table on the microscope , we were able to show that on heating to 500° the gas bubble was ... Found inside – Page 63There are three ways in which heat moves: conduction, convection, ... from every item in the room is focused onto a quartz crystal, heating it to a ... Found inside – Page 261The FCC crystal data are used for the calculations, as the amorphous ... where dense (quartz) and cage (zeolites) crystals have been studied by use of MD. Found inside – Page 16The precision expected by using the quartz crystal thermometer was not achieved in ... distribution of the heat of solution at the beginning of the run . Found inside... quartz (SiO2) is 573°C and for barium titanate 120°C. Piezoelectricity was discovered by Jacques and Pierre Curie in natural quartz crystals in 1880. Found inside – Page 239H. E. Benrath observed quartz crystals in a devitrified potash - soda - glass , but F. Fouqué and A. M. Lévy could not confirm ... He also found that quartz crystals are formed when water from the thermal spring at Plombières is heated ; and F. Found inside – Page 32Reports from the literature Generally , the colours of synthetic quartz are somewhat dull though not without charm . To obtain blue , cobalt can be added and the crystal heated in a reducing atmosphere ; for brown , iron can be added ; dark ... Found inside – Page 121The crystals almost invariably show a resorption border with minute magnetite crystals . Alteration products are magnetite and quartz , the latter forming near the center of the crystal . Sometimes the groundmass bordering the hornblende is ... Found inside – Page 730Plates of flawless natural and cultured quartz crystal are cut to ... BASKET KAYLO INSULATION SIDE HEATERS VERMICULITE INSULATION BOTTOM HEA QUARTZ SUPPLY ... Found inside – Page 237This weak or moderate crystal oscillation means that there will be less heating effects in the quartz plate ; the frequency drift , due to changes in temperature , is therefore minimized . Mere operation of a quartz crystal oscillator tube at relatively ... 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