Refractory metals welded or brazed with tungsten inert gas equipment

Appropriate brazing metals and temperatures facilitate the welding or brazing of base metals with tungsten inert gas equipment. The highest quality bond is obtained when TIG welding is performed in an inert atmosphere

Inert-gas welding and brazing enclosure fabricated from sheet plastic

Custom-fabricated plastic bag maintains an inert-gas atmosphere for welding and brazing certain metals. The bag fits over part of the workpieces and the welding and brazing tools. It is also used for metal brazing and fusion plating which require an inert-gas atmosphere

Economic Aspects Of Using Grain Alcohol, As A Motor Fuel, With Emphasis On By-Product Feed Markets

The economic feasibility of a grain alcohol motor fuel program is affected by relative prices of grain and gasoline, alcohol manufacturing costs, and the impact of increased by-product feed production on soybean meal and soybean prices. This study examined potential impacts on corn, soybean and soybean meal prices from use of alcohol-gasoline motor fuel blends at six different state, regional and national levels-..

Overview of the Surficial Geologic Map of the Des Moines Lobe of Iowa, Phase 3: Boone and Story counties

https://ir.uiowa.edu/igs_ofm/1021/thumbnail.jp

UPPER BODY SEGMENT LENGTHS AS A PROPORTION OF HEIGHT IN CHILDREN

Most research studies in biomechanics directly measure body segment lengths via anthropometry or digitization of joint markers. There are circumstances in which estimating segment lengths in relation to height is desirable, such as in biomechanical modelling or in the classroom. One commonly used model for this purpose is that by Drillis and Contini (1966; cited in Winter, 2005). One problem with this model is that the initial data was derived from adults, and thus has potentially limited applicability to the study of biomechanics in children. The purpose of the present study was to compare actual selected upper body segment lengths measured via anthropometry to those predicted by Drillis and Contini and also to derive regression equations for those segment lengths based on height and age (separately for males and females)

Surficial Geologic Map of the Des Moines Lobe of Iowa, Huxley and Slater 7.5\u27 quadrangles

https://ir.uiowa.edu/igs_ofm/1022/thumbnail.jp

Economic Perspectives on GMO Market Segregation

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C2 domains from different Ca\u3csup\u3e2+\u3c/sup\u3e signaling pathways display functional and mechanistic diversity

The ubiquitous C2 domain is a conserved Ca2+-triggered membrane-docking module that targets numerous signaling proteins to membrane surfaces where they regulate diverse processes critical for cell signaling. In this study, we quantitatively compared the equilibrium and kinetic parameters of C2 domains isolated from three functionally distinct signaling proteins: cytosolic phospholipase A2-α (cPLA2-α), protein kinase C-β (PKC-β), and synaptotagmin-IA (Syt-IA). The results show that equilibrium C2 domain docking to mixed phosphatidylcholine and phosphatidylserine membranes occurs at micromolar Ca2+ concentrations for the cPLA2-α C2 domain, but requires 3- and 10-fold higher Ca2+ concentrations for the PKC-β and Syt-IA C2 domains ([Ca2+]1/2 = 4.7, 16, 48 μM, respectively). The Ca2+-triggered membrane docking reaction proceeds in at least two steps: rapid Ca2+ binding followed by slow membrane association. The greater Ca2+ sensitivity of the cPLA2-α domain results from its higher intrinsic Ca2+ affinity in the first step compared to the other domains. Assembly and disassembly of the ternary complex in response to rapid Ca2+ addition and removal, respectively, require greater than 400 ms for the cPLA2-α domain, compared to 13 ms for the PKC-β domain and only 6 ms for the Syt-IA domain. Docking of the cPLA2-α domain to zwitterionic lipids is triggered by the binding of two Ca2+ ions and is stabilized via hydrophobic interactions, whereas docking of either the PKC-β or the Syt-IA domain to anionic lipids is triggered by at least three Ca2+ ions and is maintained by electrostatic interactions. Thus, despite their sequence and architectural similarity, C2 domains are functionally specialized modules exhibiting equilibrium and kinetic parameters optimized for distinct Ca2+ signaling applications. This specialization is provided by the carefully tuned structural and electrostatic parameters of their Ca2+- and membrane-binding loops, which yield distinct patterns of Ca2+ coordination and contrasting mechanisms of membrane docking

ATTENUATION OF GROUND REACTION FORCES IN DISMOUNTS FROM TEH BALANCE BEAM

Epidemiological studies have documented the incidence of injuries in female gymnasts . In comparison to other sports, the incidence of injury in gymnastics is high relative to other sports. One epidemiology study prompted the author to state that "...women's gymnastics should he recognized as a hazardous sport." To understand the etiology 01 injury, researchers have identified injuries by sites, types and/or events (floor, uneven bars, vault, and balance beam). Dismounts, considered an element 01 all events, have drawn attention as an injury mechanism. Studies have shown he dismount, especially when gymnasts attempt to "stick" their lauding, to be a major component of the incidence of injury. This study investigated ground reaction forces in the dismount from the balance beam under two styles (stick and roll-out of the landing). Attenuation of relatively high impact forces through modification of landing may be used, at minimum, in practices to reduce the exposure to gymnasts to this physical contraindication. Subjects were 23 female gymnasts who ranged in age (118 to 201 months, mean=158.8, SD=23.7) and level (5 to 10). Each subject was asked to perform two types of dismounts (roundoff and barani) from a balance beam and to land each dismount with two the different styles onto a mot adhered to a force platform. AU subjects had ground reaction forces for both styles of the roundoff. and 14 subjects had ground reaction forces for both styles of the barani dismount. Table 1 contains a summary of the ground reaction forces as a percentage of body weight. Our results indicate that vertical ground reaction forces are significantly reduced by rolling out of the landing