Mechanical jacking

Note Hydraulic and mechanical tensioners have to translate hydraulic pressure or torque on the small jack screws, respectively, into preload. If more accuracy for measuring the tension in the bolt is required, and hydraulic or mechanical jacking has been specified, a device such as the RotaBolt or the equivalent can be incorvorated into the anchor design. 

Lock, Jack A., Techniques for More Accurate Centrifugal Compres. ur Performance Evaluation, ASME 29th Annual Petroleum Mechanical Engineering Conference, New York American Society of Mechanical Engineers, 1974. 

Today, hydraulic power is used to operate many different tools and mechanisms. In a garage, a mechanic raises the end of an automobile with a hydraulic jack. Dentists and barbers use hydraulic power to lift and position their chairs. Hydraulic doorstops keep heavy doors from slamming. Hydraulic brakes have been standard equipment on automobiles since the 1930s. Most automobiles are equipped with automatic transmissions... 

Concanavalin A is a plant lectin from the jack bean (Canavalia ensiformis) which binds with high affinity to mannose residues of glycoproteins. Concanavalin A is known to stimulate the tyrosine kinase activity of the INSR (3-subunit with consecutive activation of kinases downstream the insulin receptor (IRS, PI 3-kinase). It is believed that Concanavalin A stimulates the activation and autophosphorylation of the INSR kinase through aggregation of the receptor, although the precise mechanism of action is unclear. 

Photo 7 Linus Pauling with Jack Sherman at Caltech, 1933. Sherman, along with G. W. Wheland, were two of Pauling s closest collaborators in developing and applying his concepts of the nature of the chemical bond (SP 8, SP 9, SP 10, SP 13, SP 16) and in using quantum mechanics to analyze molecular properties (SP 66). 

You could visit earth, hire a mechanical workshop in a remote area, car-jack a few specimens, and dissect them. You would observe that cars differ in their colour, shape, size and spec. Some may even contain a bar, cinema or swimming pool, but, perhaps, limousines are excluded from your exploration. On closer examination you would notice small ID-numbers imprinted on various strategic body parts. In short - you would find no two cars that are exactly the same. 

Peter Lacouture, Associate Director, Clinical Research, The Purdue Frederick Company, Norwalk, Connecticut Dr. Fumio Matsumura, Associate Director, Toxic Substances Program, Institute of Toxicology and Environmental Health, University of California, Davis, California Dr. Frederick Oehme, Director, Comparative Toxicology Laboratories, Kansas State University, Manhattan, Kansas and Dr. Jack Radomski, Private Consultant, Jonesport, Maine. These experts collectively have knowledge of heptachlor and heptachlor epoxide s physical and chemical properties, toxicokinetics, key health end points, mechanisms of action, human and animal exposure, and quantification of risk to humans. All reviewers were selected in conformity with the conditions for peer review specified in Section 104(i)(13) of the Comprehensive Environmental Response, Compensation, and Liability Act, as amended. 

Jack Halpera I wish to comment on two points that arise directly from Dr. Anbar s remarks. The first concerns the oxidation of ethylenediamine by copper. It seems to me that in the oxidation of organic ligands by copper (I I) one mechanism that ought to be considered seriously is that involving transfer of a hydride ion to the metal. We have shown unequivocally that in the reactions of H2, catalyzed by copper (I I), a relatively stable species, CuH+, is formed by transfer of a hydride from molecular hydrogen to cupric—i.e.,... 

Reductive dissolution of iron (oxy)(hydr)oxides Bhattacharya, Chatterjee and Jacks (1997) first proposed that the main mechanism for mobilization of arsenic sorbed to iron (oxy)(hydr)oxides is reductive dissolution. This hypothesis has since been generally accepted (Harvey et al., 2002 McArthur et al., 2004 Nickson et al., 2000 Harvey et al., 2005 McArthur et al., 2001 Harvey et al., 2006 Ravenscroft, McArthur and Hoque, 2001). McArthur et al. (2001) stated that arsenic liberation via reductive dissolution of metal (oxy)(hydr)oxides is common in nature and the good correlation between arsenic and HCCF- in Bangladesh groundwater is probably an indication of reduction. 

Roughly 30% of enzymes are metalloenzymes or require metal ions for activity and the present chapter will concentrate on the chemisty and structure of the plant metalloenzymes. As analytical methods have improved it has been possible to establish a metal ion requirement for a variety of enzymes which were initially considered to be pure proteins. A dramatic example is provided by the enzyme urease isolated from Jack beans and first crystallised by Sumner (1926) (the first enzyme to be crystallised). Sumner defined an enzyme as a pure protein with catalytic activity, however, Zerner and his coworkers (Dixon et al., 1975) established that urease is in fact a nickel metalloenzyme. Jack bean urease contains two moles of nickel(II) per mole of active sites and at least one of these metal ions is implicated in its mechanism of action. 

Prior to the crystallization of jack bean urease it was assumed by the biochemical community that enzymes had no ordered structure. In 1965 the first crystallographic evidence for the mechanism by which enzymes work when Phillips and his group solved the lysozyme structure [6], Details of the structure indicated how the enzyme could bind the oligosaccharides present in its target, bacterial cell wall peptidoglycans, and could respond to the binding event by changing its structure. 

Jack Simons and Jeff Nichols, Quantum Mechanics in Chemistry, Oxford University Press, New York, 1997. 

Mather, I.H., Jack, L.J.W., Madara, P.J., Johnson, V.G. 2001. The distribution of MUC1, an apical membrane glycoprotein, in mammary epithelial cells at the resolution of the electron microscope implications for the mechanism of milk secretion. Cell Tissue Res. 304, 91-101. 

Dr. jack p. holman received the Ph.D. degree in mechanical engineering from Oklahoma State University in 1958. After two years active duty as a research scientist in the Air Force Aerospace Research Laboratory, he joined the faculty of Southern Methodist University, where he is presently Professor of Mechanical Engineering. 

Pascal 3. The hydraulic lever. The hydraulic jack is a problem in fluid equilibrium, just as a pulley system is a problem in mechanical equilibrium (no accelerations involved). It s the static situation in which a small force on a small piston balances a large force on a large piston. No change of pressure need be involved here. A constant force on one piston slowly lifts a different piston with a constant force on it. At all times during this process the fluid is in near-equilibrium. This principle is no more than an application of the definition of pressure as F/A, the quotient of... 

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