Fuses, miner

Fuse, Miner s or Safety Fuse. Same as Bickford Fuse... 

Fuses, Miner s. Same as Bickford Fuse described in Vol 2, p B112... 

Uses For safety fuses (Miner s fuse, Bickford fuse). For time-train rings and combination fuzes. (In mechanical devices the spelling is z.)... 

The interface between the two systems includes the 1 torr region where deposition of products can occur. Severe suppression of signal has been observed when high concentrations of dissolved solids are present. This may be caused by suppression of ionization by other more easily ionized elements present in the sample. The exact cause of this interference is not clear, but the fact remains that interference does take place. The problem can be overcome to some extent by limiting the concentration in the samples to less than 0.2% total solids. This can be a serious limitation, particularly when body fluids or fused minerals are being examined. 

Such studies are really only of use for SCPs rather than IASs. The vast majority of IASs come from solid fossil-fuels (coals, oil shale) but there is no morphological means by which to separate them, coming as they do from the fused minerals present within the fuel. Similarly, there is no certain way of identifying sources chemically, as the chemical composition of the IAS particle is dependent upon the original mineral rather than the fuel-type and hence the particle compositions are also potentially very similar between fuel-types (i.e., mainly aluminosilicate). However, Alliksaar et al. (1998) suggest that oil shale IASs contain higher Ca and K and lower Al than their coal-derived counterparts. 

The use of sol-gel processing for abrasives has the distinct advantage over fused mineral methods in that the abrasive particles can be shaped or crushed to a desired size prior to firing. Out of size material can be recycled to maximize yield. The sol-gel materials also fracture in a conchoidal fashion producing shards having sharp and smooth surfaces. Such particles provide excellent abrasive surfaces after sintering. 

Griffiths et al. (1992) and Rhzevski and Novik (1971) note that there is a difference of the conductivity values between monocrystal, polycrystal, and fused minerals. For quartz in particular, they report a variation between a... 

Simple examples of WLN are C2H5OH is Q2 CH3C0 0CH3 is IVOl For branch chain and fused ring structures rules determine the order of notation. It is claimed that over 50% of all organic structures can be represented by less than 25 characters, witherite, BaCOj. The white mineral form of barium carbonate. Used as a source of Ba compounds and in the brick and ceramic industries. 

Generally, soluble materials are more effective as micronutrient sources than are insoluble ones. For this reason, many soil minerals that contain the micronutrient elements are ineffective sources for plants. Some principal micronutrient sources and uses are summarized below. In this discussion the term frits refers to a fused, pulverized siUceous material manufactured and marketed commercially for incorporation in fertilizers. Chelates refers to metaHoorganic complexes specially prepared and marketed as especially soluble, highly assimilable sources of micronutrient elements (see CHELATING agents). 

Anhydrous aluminum triduotide, A1F., is a white crystalline soHd. Physical properties are Hsted ia Table 2. Aluminum duotide is spatingly soluble ia water (0.4%) and iasoluble ia dilute mineral acids as well as organic acids at ambient temperatures, but when heated with concentrated sulfuric acid, HF is hberated, and with strong alkah solutions, aluminates are formed. A1F. is slowly attacked by fused alkahes with the formation of soluble metal duotides and aluminate. A series of double salts with the duotides of many metals and with ammonium ion can be made by precipitation or by soHd-state reactions. 

Precision Electro Minerals fused United States 9... 

Transparent fused silica can be formed at a temperature of 1200°C and a pressure of 13.8 MPa (2000 psi) from silica powder consisting of 15 nm ultimate particles (92) or by electric arc fusion of pure silica sand having low iron and alkali metal contents. The cooled product is ground to the desired particle size. Fused sihca is primarily manufactured by C-E Minerals, Minco, and Precision Electro Minerals in the United States by Chuo Denko, Denki Kagaku Kogyo, NKK, Showa Denko, and Toshiba Ceramics in Japan. Based on 1988 data and projected growth, an estimated 135,000 metric tons of fused siUca were used in 1994 as a sacrificial component or investment casting in the manufacture of metals and as a component in refractory materials (62). 

Transparent Vitreous Silica. Clear, transparent, bubble-free vitreous sihca may be obtained by melting natural quart2 minerals, ie, fused quart2, by flame or plasma vapor deposition (synthetic fused siUcas), and by sol—gel processing. 

Titanium disiUcide [12039-83-7] is a silvery-gray, crystalline material that oxidizes slowly in air when heated to 700—800°C. It is resistant both to mineral acids (except hydrofluoric) and to aqueous solutions of alkaUes, but reacts with fused borax, sodium hydroxide, and potassium hydroxide. It reacts explosively with chlorine at high temperatures. 

Mischmetal. Mischmetal [62379-61-7] contains, in metallic form, the mixed light lanthanides in the same or slightly modified ratio as occurs in the resource minerals. It is produced by the electrolysis of fused mixed lanthanide chloride prepared from either bastnasite or mona2ite. Although the precise composition of the resulting metal depends on the composition of chloride used, the cerium content of most grades is always close to 50 wt %. 

The hydrated alumina minerals usually occur in ooUtic stmctures (small spherical to eUipsoidal bodies the size of BB shot, about 2 mm in diameter) and also in larger and smaller stmctures. They impart harshness and resist fusion or fuse with difficulty in sodium carbonate, and may be suspected if the raw clay analyzes at more than 40% AI2O2. Optical properties are radically different from those of common clay minerals, and x-ray diffraction patterns and differential thermal analysis curves are distinctive. 

Both acids and alkalis are electrolytes. The latter when fused or dissolved in water conduct an electric current (see page 55). Acids are considered to embrace substances capable of accepting an electron pair. Mineral acids have wide usage as indicated by Table 3.4. 

The elements of Group 5 are in many ways similar to their predecessors in Group 4. They react with most non-metals, giving products which are frequently interstitial and nonstoichiometric, but they require high temperatures to do so. Their general resistance to corrosion is largely due to the formation of surface films of oxides which are particularly effective in the case of tantalum. Unless heated, tantalum is appreciably attacked only by oleum, hydrofluoric acid or, more particularly, a hydrofluoric/nitric acid mixture. Fused alkalis will also attack it. In addition to these reagents, vanadium and niobium are attacked by other hot concentrated mineral acids but are resistant to fused alkali. 

---