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Activators behavior influenced

Figure 53 shows relative rates of C02 formation under steady-state conditions that were recorded with various single-crystal surfaces of Pd as well as with a polycrystalline Pd wire (173). It must be noted that with these experiments no determination of the effective surface areas was performed so that no absolute turnover numbers per cm2 are obtained. Instead, the reaction rates were normalized to their respective maximum values. As can be seen from Fig. 53, all data points are close to a common line which indicates that, in fact, with this reaction the activity is influenced very little by the surface structure. As has been outlined in Section II, the adsorption of CO exhibits essentially quite similar behavior on single-crystal planes with varying orientation. Since the adsorption-desorption equilibrium of CO forms an important step in the overall kinetics of steady-state C02 formation, this effect forms at least a qualitative basis on which the structural insensitivity may be made plausible. [Pg.66]

The role of metal-support interaction on the catalytic activity of carbon-supported Pt nanoparticles toward oxygen reduction and methanol oxidation was analyzed. It was observed that both dispersion and specific activity are influenced by the interaction of the active phase with the support, determining well-defined relationships that may be used for interpreting the electrochemical behavior of new, more advanced catalytic systems. [Pg.659]

Some binary systems do not show any depression at all, indicating that T and T do not depend on blend composition. This is found when the second dispersed phase does not influence the normal crystallization behavior of the matrix polymer no nucleating activity, no influence on sphemUte growth rate, etc. [Pg.259]

The spectrum of surface active behavior displayed by food proteins directly reflects differences in structural and physicochemical properties among the proteins originating from various sources i.e. meat, milk, legumes. Chemical or enzymatic modification of model food proteins has indicated that alteration of specific structural features e.g. net charge, disulfide bonding, size, does influence film formation, foaming and emulsifying properties. [Pg.629]

The utilization of RF-GC has been extended to CO adsorption under H2-rich conditions (which is an elementary step of selective CO oxidation), initially over a silica-supported rhodium catalyst, which combines high selectivity and satisfactory activity.The influence of the hydrogen amount in catalyst adsorptive behavior was studied by using three different composition carrier gas hydrogen/helium mixtures. Their compositions were 25.05% H2 + 74.95% He (v/v, 99.999% pure), 49.95% H2 + 50.05% He (v/v, 99.999% pure), and 75.05% H2 + 24.95% He (v/v, 99.999% pure). [Pg.962]

Some of the results discussed previously show that KOH and NaOH present similar activation behavior. However, there are some differences, as discussed in Section II.B. The relative effectiveness of the hydroxides depends on the nature of the precursor, especially on its structural order [100,101] NaOH is apparently better for carbons without structural order, whereas KOH seems better for those having some structural order. These intriguing results could be related to the different behaviors of Na and K as intercalates in the graphene layers of the carbonaceous precursors (or the carbon products) such influence of metal insertion has been recently reported [98,101]. [Pg.41]

ABSTRACT Any human activity is influenced by the working environment in which it is developed. The opinion of employees is, nowadays, an important factor to consider because their perception may be related to their behavior. The satisfaction of all individuals housed in a thermal environment is an almost impossible task because a thermally comfortable environment for one person may be uncomfortable for another. Therefore, it would be ideal to create a thermal environment that satisfied the largest number of workers. As such, the evaluation of thermal comfort implies a certain degree of subjectivity and requires the analysis of two aspects physical (thermal environment) and subjective (state of mind of the individual). This study aims to analyze the pattern of thermal sensation of a packaging section of quick-frozen desalted codfish, discover the location of the most vulnerable workstations to thermal stress and assess the real thermal sensation of workers. The data were collected using a measurement instrument named Center 317—temperature humidity meter . For the analysis of thermal sensation the follow indexes were applied Temperature Humidity Index (THI), Thermal Comfort Scale (EsConTer) and Predicted Percentage of Dissatisfied (PPD). A set of standards were created for each variable and the results obtained indicate the most vulnerable workstations. Intervention strategies were considered. [Pg.245]

Furthermore, anodic protection can only be used in relatively well-behaved or understood environments since the composition of the electrolyte and its temperature can greatly influence the passive/active behavior of a metal or an alloy. The relative tendency for passivation is strongly dependent on the interactions between a metal and its enviroiunent and it may vary extensively with changes in either. [Pg.136]

Reproductive Behavior. Male accessory glands contain peptides which affect female reproductive behavior. Female sexual receptivity is diminished after mating (22) and oviposition is stimulated (22). Peptides responsible for these behaviors have been isolated from Drosophila species (22,23) and sequenced. In addition, a peptide with similar behavioral influences in a lepidopteran has been isolated from Helicoverpa zea (24). Miller (this volume) discusses the potential of these "sex peptides" in the development of unique insect control strategies. While males influence female reproductive behavior via the action of "sex peptides", females, especially in the Lepidop-tera, influence male behavior through the release of pheromone. The production of pheromone, in turn, is controlled by the pheromone biosynthesis activating neuropeptide (PBAN for a comprehensive review see 25). PBAN-like activity has been observed in more than 20 insect species (25) and offers another avenue for exploitation of neuropeptides in insect control. [Pg.184]

In the deductive safety analysis all possible variances and consequently the entire specifiable space should be analyzed. In the inductive safety analysis the specified elements are considered at the respective horizontal abstraction level and the possible error influences or impacts are evaluated. As a result a systematic falsification of the specified space could lead to completeness regarding possible error behavior. Influences and combinations, which the developer cannot imagine or not systematically evaluate, are also not verifiable. The characteristics of the product should be ensured at the end of such horizontal development activities after their verification. [Pg.182]

Imagine a workplace where everyone coaches each other about the safest way to perform a job. When workers depend on others in this way to improve safety, they understand teamwork. They appreciate how everyone s safe and at-risk behavior influences the safety of everyone else. With this interdependent attitude, they re willing to use behavior-based coaching to actively care for their coworkers. [Pg.79]

Ownership, commitment, and proactive behaviors are more likely when we work toward our own goals, not tire government s. As discussed in Chapter 19, how we define programs and activities can influence attitudes that shape involvement. It makes sense to talk about corporate safety as a mission owned and achieved by the very people it benefits. [Pg.478]

In a continuous polymerization process, this observed activity behavior directly influences the obtained microstmcture of the polymer. Thus, a copolymerization of propene and the borane monomer leads to a copolymer, because of the preferred incorporation of propene, with long propene sequences. This copolymer forms crystalline phases similar to those obtained in pure isotactic PP. The borane groups are located in the amorphous part of the copolymer and so even under heterogeneous and mild conditions a modification of the borane groups (e.g., conversion to alcohol functionalities) can be performed quantitatively. This behavior leads to a polar modified polymer that can co-crystallize with pure isotactic PP and thus be used in polymer blends in order to optimize the PP adhesion to other materials such as aluminum and glass. [Pg.785]

Even at 0 K, molecules do not stand still. Quantum mechanically, this unexpected behavior can be explained by the existence of a so-called zero-point energy. Therefore, simplifying a molecule by thinking of it as a collection of balls and springs which mediate the forces acting between the atoms is not totally unrealistic, because one can easily imagine how such a mechanical model wobbles aroimd, once activated by an initial force. Consequently, the movement of each atom influences the motion of every other atom within the molecule, resulting in a com-... [Pg.359]

The chemical composition, physical stmcture, and key physical properties of a foam, namely its stabiHty and theology, are all closely interrelated. Since there is a large interfacial area of contact between Hquid and vapor inside a foam, the physical chemistry of Hquid—vapor interfaces and their modification by surface-active molecules plays a primary role underlying these interrelationships. Thus the behavior of individual surface-active molecules in solution and near a vapor interface and their influence on interfacial forces is considered here first. [Pg.426]

In all of the process operations except venting and flaring, exposure is related to worker activity, and to some extent is dependent on worker behavior and the work practices appHed. The distinction between those exposures that are impacted by worker behavior and those that, barring the use of respirators, are not is important. The types of control methods to be appHed and the methods of exposure measurement to be used are influenced by this difference. [Pg.104]


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See also in sourсe #XX -- [ Pg.28 , Pg.132 , Pg.145 , Pg.167 ]




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