Big Chemical Encyclopedia

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

Articles Figures Tables About

Effect of the rules

The rules of the scheme contain requirements covering such topics as  [Pg.68]

Surveillance audits Consultancy Auditor database Auditor qualification Audit reports Minimum audit man-days [Pg.68]

Within the rules are some significant requirements that impact the way auditors will plan, conduct, and report their audits. These are covered in more detail in Part 1 Chapter 6. [Pg.68]

These requirements are binding on certification bodies approved by lATE If the auditor does not adhere to the rules such conduct may result in the CB being disqualified. [Pg.69]

More than one pre-audit on any one site in the same company shall be considered consulting. The auditor must decline requests by the supplier to return to the site to confirm that pre-audit observations have been satisfactorily resolved before commencing the certification audit. [Pg.69]


Labor states that crystalline silica kills hundreds of American workers and sickens thousands more each year. For construction at least, the proposed rule is expected to save 560 lives and about 1,080 cases of silicosis per year among construction workers once the full effects of the rule are realized. [Pg.640]

The effect of the AK = 1 selection rule, compared with AK = 0 for an transition, is to spread out the sets of P, Q, and R branches with different values of K. Each Q branch consists, as usual, of closely spaced lines, so as to appear almost line-like, and the separation between adjacent Q branches is approximately 2 A — B ). Figure 6.29 shows such an example, E — A band of the prolate symmetric rotor silyl fluoride (SiH3F) where Vg is the e rocking vibration of the SiH3 group. The Q branches dominate this fairly low resolution specttum, those with AK = - -1 and —1 being on the high and low wavenumber sides, respectively. [Pg.179]

It is essential to ensure that the following criteria are met otherwise errors will result. First, the mouth of the hole inside the duct must be smooth and flush with the duct inner surface. No burrs or other irregularities must be on the surface in the vicinity of the hole. Second, the hole must be perpendicular to the tube axis. The size of the hole has an effect on the measured pressure as well. A general rule is, the smaller the hole the better. Very small holes do, however, slow down the response of the instrument. Usually the hole diameter is a few millimeters. Note also that the smaller the hole, the greater the risk of blockage. Further information on the effect of the hole size can be found, e.g., in Ower and Pankhurst. [Pg.1151]

Monitor the effectiveness of the decisions and adjust your rules accordingly. [Pg.551]

The practical implications of this experiment are that when evaluating the effects of shift work due to circadian effects, the type of task being carried out by the worker must be taken into account. For example, skill-based tasks would be expected to exhibit the performance changes characteristic of low memory load tasks, whereas performance variations in knowledge-based tasks would be expected to follow the pattern of high memory load tasks. Performance on rule-based tasks may depend on the degree of frequency of use of the rules, which in turn may determine the memory load. If these results were confirmed by further process plant studies, it would have implications for when different types of operation (involving different levels of memory load) should be scheduled to reduce circadian rhythm effects and minimize errors. [Pg.118]

This apparent characteristic enhancement in the basicity has been used quite frequently for the determination of the position of a double bond with respect to the nitrogen atom in unsaturated amines. The cases such as neostrychnine (134) and dehydroquinuclidine (139) in which the protonation at the 8-carbon atom cannot occur due to the lack of overlap between the electron pair on the nitrogen atom and the tt electrons of the double bond, since this would involve the formation of a double bond at the bridgehead— a violation of Bredt s rule—show a decrease in basicity. For instance the basicities of quinuclidine (140) and dehydroquinuclidine (139) have been shown by Grob et al. (82), to differ by 1.13 pK units in aqueous solution at 25. This decrease in basicity has been attributed to the electron-withdrawing inductive effect of the double bond. [Pg.49]

Electronic absorption spectra are produced when electromagnetic radiation promotes the ions from their ground state to excited states. For the lanthanides the most common of such transitions involve excited states which are either components of the ground term or else belong to excited terms which arise from the same 4f" configuration as the ground term. In either case the transitions therefore involve only a redistribution of electrons within the 4f orbitals (i.e. f—>f transitions) and so are orbitally forbidden just like d—>d transitions. In the case of the latter the rule is partially relaxed by a mechanism which depends on the effect of the crystal field in distorting the symmetry of the metal ion. However, it has already been pointed out that crystal field effects are very much smaller in the case of ions and they... [Pg.1243]

To derive the maximum amount of information about intranuclear and intemuclear activation for nucleophilic substitution of bicyclo-aromatics, the kinetic studies on quinolines and isoquinolines are related herein to those on halo-1- and -2-nitro-naphthalenes, and data on polyazanaphthalenes are compared with those on poly-nitronaphthalenes. The reactivity rules thereby deduced are based on such limited data, however, that they should be regarded as tentative and subject to confirmation or modification on the basis of further experimental study. In many cases, only a single reaction has been investigated. From the data in Tables IX to XVI, one can derive certain conclusions about the effects of the nucleophile, leaving group, other substituents, solvent, and comparison temperature, all of which are summarized at the end of this section. [Pg.331]

Thiepin, as a seven-membered conjugated system with sulfur as heteroatom, is a member of the 8 7t-electron heteroannulenes which are antiaroinatic according to Hiickel s rule. In contrast to oxepin, thiepin is not stable at room temperature and no valence isomerism with an arene sulfide has been observed. Stable thiepins are obtained only when two bulky substituents, e.g. /ert-butyl, are introduced into positions 2 and 7. In benzothiepins the annellation effect of the aromatic rings contributes decisively to the stability of these compounds stability increases with an increasing number of fused benzene rings. [Pg.65]

Nernst, in his Theoretische Chemie, devoted a whole chapter to a critical examination of the rule of Thomsen and Berthelot, and he concluded that in many cases the heat of reaction certainly does correspond very closely with the maximum work, AT, which latter magnitude he took from van t Hoff as a measure of the chemical affinity. Whilst pointing out that it very often gives results wholly incompatible with experience, and cannot therefore be indiscriminately applied, Nernst showed that the rule nevertheless holds good in too many cases to be wholly false in an appropriate metaphor he claimed that it contains a genuine kernel of truth which has not yet been shelled from its enclosing hull. This labour of emancipation was partially effected in the newer work of the same author, Applications of Thermodynamics to Chemistry, 1907, which is an attempt to place the rule of Berthelot on a scientific basis, and to determine under what conditions its use is legitimate. He points out that the equation ... [Pg.507]

What predictions can we make about the effect of an electropositive additive, such as Li, on the basis of the rules of Section 2.5 or, equivalently, from equations (2.28) and (2.29) ... [Pg.73]

If, now, Si lies within the limits 1/t i < S2< /< i, which seem quite reasonable, the over-all effect of the perturbation is a transference of negative electricity from the various carbon atoms to the nitrogen atom at position 1, with the consequence, in accordance with the rule formulated above, that the molecule is deactivated so that substitution is more difficult than in benzene and furthermore the a and y positions (2 and 6, and 4, respectively) are most affected by this transference of electricity, so that substitution will take place at the 0 positions (3 and 5), which have the smallest deficiency of electrons. Both of these conclusions are borne out by experiment. [Pg.198]

The destabilizing effect of the adjacent charge rule shown in covalent nitrates does not occur in the analogous compounds containing carbon as the central atom, such as carbonates, urea, guanidine, etc., since the quadricovalent carbon atom is neutral. [Pg.640]

As a general rule, clinical data are required as evidence to support conformity with the requirements of the Active Implantable Medical Devices (AIMD) and the Medical Device (MD) directives with regards to safety and effectiveness under the normal conditions of use, evaluation of undesirable side effects, and the acceptability of the benefit/risk ratio. Risk analysis should be used to establish key objectives that need to be addressed by clinical data, or alternatively to justify why clinical data are not required (mainly for Class I devices). The risk analysis process should help the manufacturer to identify known (or reasonably foreseeable) hazards associated with the use of the device, and decide how best to investigate and estimate the risks associated with each hazard. The clinical data should then be used to establish the safety and effectiveness of the device under the intended use conditions, and to demonstrate that any of the residual risks are acceptable, when weighed against the benefits derived from use of the device. [Pg.187]

In the N-Bz derivatives of Gly and Gly-Gly, the planar [R3Sn(IV)] moieties are bridged by -COO groups. Because of the negative inductive effect of the Ph group, which reduces the donor ability of oxygen atoms, coordination of the amide -C = O in the latter compounds could be ruled out. [Pg.366]

In the case of the reverse-electron-demand Diels-Alder reactions, the secondary orbital interaction between the Jt-HOMO of dienophile and the LUMO of 114 or the effect of the orbital phase enviromnents (Chapter Orbital Phase Enviromnents and Stereoselectivities by Ohwada in this volume) cannot be ruled out as the factor controlling the selectivity (Scheme 55). [Pg.216]

After some intuition about the effects of these rules is acquired, the reader is encouraged to try other combinations. [Pg.32]

The known toxinology of the Na channel classifies compounds into three categories activators, stabilizers, and occluders. Although these terms describe the apparent major effect of the toxin, it should be realized that multiple effects are more often the rule than the exception. [Pg.7]

The BET sur ce area of CNF-R and CNF-HT are 152.5 and 141.6 m /g respectively. After oxidation, the surface areas increase a little (160-170 m /g). All the samples have small micropore volumes (<0.008 cm /g). XRD results imply a 0.339 nm doo2 spacing for CNF-HT, which is smaller than that of CNF-R (0.341 nm). The onset weight loss tenperature (temperature nc ed to reach 5 % hum-ofrf) of the CNF-HT is 660 U while the CNF-R is only 540 U. These results indicate the graphitizaton extent of CNF increases after heat treatment. The ash content of CNF-HT is 0.06 wt%. So, the side effects of the metal on catalytic performances can be ruled out... [Pg.746]

Kinetics on the level of individual molecules is often referred to as reaction dynamics. Subtle details are taken into account, such as the effect of the orientation of molecules in a collision that may result in a reaction, and the distribution of energy over a molecule s various degrees of freedom. This is the fundamental level of study needed if we want to link reactivity to quantum mechanics, which is really what rules the game at this fundamental level. This is the domain of molecular beam experiments, laser spectroscopy, ah initio theoretical chemistry and transition state theory. It is at this level that we can learn what determines whether a chemical reaction is feasible. [Pg.24]


See other pages where Effect of the rules is mentioned: [Pg.68]    [Pg.307]    [Pg.238]    [Pg.38]    [Pg.447]    [Pg.68]    [Pg.307]    [Pg.238]    [Pg.38]    [Pg.447]    [Pg.525]    [Pg.1099]    [Pg.402]    [Pg.246]    [Pg.122]    [Pg.344]    [Pg.132]    [Pg.1099]    [Pg.1244]    [Pg.133]    [Pg.151]    [Pg.126]    [Pg.360]    [Pg.401]    [Pg.161]    [Pg.216]    [Pg.26]    [Pg.63]    [Pg.112]    [Pg.128]    [Pg.363]    [Pg.450]    [Pg.319]   


SEARCH



The rule

© 2024 chempedia.info