Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Hooke modified

Since AEr is small compared to Er, the AEr in the denominator terms will have little effect on the variance of T and in the limit approaches zero. In a case where this is not true, the derivation must be suitably modified to include this term. This is relatively straightforward substitute the parenthesized terms into the equation for variance (e.g., as we do in the appendix), hook up about a 100-hp motor or so and turn the crank -as we will do in due course. It is mostly algebra, although a lot of it ... [Pg.229]

The optimum seeking methods which have been found to be particularly useful are the modified Fibonacci search (search by golden section) for one-dimensional searches and the Hooke-Jeeves search for multi-dimensional searches. Beveridge and Schechter (8) give a complete description of these searches. [Pg.100]

Fig. 1. Schematic diagrams based on the solution NMR structure of a complex of the second AT-hook motif of the human HMGAla protein bound to the minor groove of an AT-rich synthetic duplex DNA fragment [25], Various projected views of either the AT-hook peptide, or a co-complex of the peptide with DNA are shown (see text for details). Modified from Ref. [7]. Fig. 1. Schematic diagrams based on the solution NMR structure of a complex of the second AT-hook motif of the human HMGAla protein bound to the minor groove of an AT-rich synthetic duplex DNA fragment [25], Various projected views of either the AT-hook peptide, or a co-complex of the peptide with DNA are shown (see text for details). Modified from Ref. [7].
Good donor cars. The Camaro has a computer on board, I have one with a v6 vortec. The Mustang will be the better bet as the car won t need to be modified. Just print off the diagram and use the parts listed. Don t change the fuel tank or exhaust at this point in time. Just hook a hose to the fuel pump from a separate tank of water, you won t have to mount anything on the car either. [Pg.12]

Lock EA, Ishmael J, Hook JB. 1984. Nephrotoxicity of hexachloro-1,3-butadiene in the mouse The effect of age, sex, strain, monooxygenase modifiers, and the role of glutathione. Toxicol AppI Pharmacol 72 484-494. [Pg.107]

The force field approach assumes that it is possible to describe the geometry of a molecule by a set of mechanical equivalents. Changes in bond length are, for example, represented by- a modified Hook s law V(r) = 0.5 x 1 x (r — r0)2 for a spring or bending of a bond angle is modelled by a bending potential VB = kB x (0 — 0O)2, where kB, ks, r0, and 0O are parameters that are dependent on the incorporated atom... [Pg.148]

Drawbacks of the RTP ports are that they cannot be hooked into the isolator clean in place (CIP) system so, they must always be considered dirty until an adequate cleaning procedure is developed. There are also size limitations to the RTP ports and their corresponding containers. Once a certain size port is selected for the isolator, this is the only diameter container that can be used, unless the isolator port is modified. The port also requires an additional penetration of the isolator wall and serves as another potential point for air leaks. In addition, the RTP containers are not amenable to the transport of flasks into and out of the isolator they require rotation and maneuvering of the RTP container to dock it into the isolator. Unless the port is mounted into the isolator floor, which will take up valuable space, the ability to transport liquids into and out of the isolator is limited to securely closed vials or bottles. The final limitation is the tendency of the seals on the mating surfaces of the RTP ports to become contaminated with potent material during transport operations. Procedures should be put in place to ensure that the mating surfaces of the RTP ports are thoroughly decontaminated as soon as the transport container is undocked from the isolator wall. [Pg.418]

Experimentally, we can introduce a built-in strain in an epitaxial layer by growing it on a lattice mismatched substrate. As long as the mismatched epitaxial layer is below the critical thickness, the produced strain is uniform and no dislocations are induced. As a result, the in-plane lattice constant of the epitaxial layer is fitted to that of the substrate, and the out-of plane lattice constant is adjusted to a new lattice constant according to the Hook law. Then, the subband structure is modified by introducing a built-in strain, and the strain has a dramatic influence on the electronic properties of the system. Theoretically, we can easily include the strain effect in the k.p theory. [Pg.191]

The basally arranged noncalcareous Polyxenida (Penicillata bristle millipedes) lack defensive glands and instead project hooked bristles against attackers such as ants.12 Similar to modified larval hairs of dermestid beetles, predators are thus effectively entangled. [Pg.403]

Chapter 4 outlines operations of symmetry on ideal solids that show how the number of independent components of the modulus tensor diminishes as the number of symmetry elements in the solid increases. This analysis leads to the formulation of the generalized Hooke s law utilizing both elastic modulus and elastic compliances for amorphous solid materials. These relationships, conveniently modified, are further used in viscoelasticity. In this chapter the generalized law of Newton for ideal liquids is also stated. [Pg.884]

The first four terms of the function are commonly found in molecular mechanics strain energy functions, and they are modified Hooke s law functions. The last term has been added to insure the proper stereochemistry about asymmetric atoms. A model is refined by minimizing the highly nonlinear strain energy function with respect to the atomic coordinates. An adaptive pattern search routine is used for the strain energy minimization because it does not require analytical derivatives. The time necessary to obtain good molecular models depends on the number of atoms in the molecule, the flexibility of the structure, and the quality of the starting model. [Pg.112]

A Schlenk tube (Figure 1) is modified so that a deep dish sample vial can be easily placed inside in a small glass cup to provide stability. For convenience a ring-like glass handle is placed on the sample vial to assist in its removal once crystals have formed. The 24/40 stopper of the Schlenk tube is also altered with a hook placed on the inside to hoist the sample vial. Lastly, a syringe port is set on the side of the Schlenk tube to provide access to both the outside and inside of the sample vial. [Pg.68]

Figure 2.9 shows an overlay of the stress-strain curve of natural rubber and an impact-modified nylon 6,6. At the top of the nylon curve is the yield point or elastic limit of the nylon. At this point, the strain is no longer recoverable and the sample exhibits plastic deformation. Of course, below this point, the material obeys Hook s law (F = -kx), where k is the spring constant, x is the distance traveled when force is applied, and F is that applied force. [Pg.27]

Modified Hooke s law corrected with cubic (as in the MM2-based force fields [8]) and further extensions to quartic terms (as in MM3 [9], CFF [10], and MMFF [11] force fields see Eq. (3) [9]) or other expansions [12] have been developed to mimic the Morse potential and are used to speed up convergence in very distorted starting geometries, while keeping a proper description of the potential energy. [Pg.3]

To help overcome this problem, the method of Hooke and Jeeves (1961) involves both exploratory moves and pattern moves (acceleration moves) with discrete steps along the search directions. The discrete steps eliminate the need for a line search. In the exploratory move phase, starting at a point X , a modified cyclic coordinate search is performed in which, if possible, the objective function is reduced once along each of the coordinate directions using a prescribed discrete step length. This leads to a new point x +j and establishes a direction of improvement. A pattern move is then performed in the direction x +j - x, leading to an intermediate point y. Now, starting from y, another exploratory move yields the point x +2- If < /(Xa +i) then an improvement has been found... [Pg.2549]

It must be possible to open a door coming from the normal direction of egress without using a key. Draw bolts, hooks, bars, or similar devices cannot be used. An essential element of a door is that it cannot be too difficult to open. The opening force for most interior doors must not exceed a force of 5 pounds. To open a door that is normally power assisted must not require more than 50 pounds with the power off. Panic hardware must require no more than 15 pounds force to release, and a door not normally provided with power assistance cannot require more than 30 pounds force to initiate motion and swing to a full-open position with apphcation of a 15-pound force. These restrictions on the force required to operate a door can easily be exceeded should the ventilation system be modified without taking this concern into account. A very moderate atmospheric pressure differential of just over 0.3 inches (water gauge) would result in a force of more than 30 pounds force on a door of the minimum acceptable size. Addition of hoods to a laboratory, without provision of additional makeup air, could easily cause this limit to be exceeded on a more representative 3 foot by 7 foot door. [Pg.116]


See other pages where Hooke modified is mentioned: [Pg.128]    [Pg.312]    [Pg.169]    [Pg.159]    [Pg.184]    [Pg.163]    [Pg.165]    [Pg.248]    [Pg.112]    [Pg.1162]    [Pg.1091]    [Pg.243]    [Pg.257]    [Pg.92]    [Pg.161]    [Pg.662]    [Pg.381]    [Pg.227]    [Pg.232]    [Pg.201]    [Pg.228]    [Pg.228]    [Pg.322]    [Pg.316]    [Pg.178]    [Pg.157]    [Pg.29]    [Pg.624]    [Pg.50]    [Pg.137]    [Pg.1185]    [Pg.744]   
See also in sourсe #XX -- [ Pg.88 ]




SEARCH



Hooke

Modified Hooke s law

© 2024 chempedia.info