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The IEC collaborates closely with the International Organization for Standardization ISO in accordance with conditions determined by agreement between the two organizations. This Part 2 is to be used in conjunction with the latest edition of IEC and its amendments. The IEC shall not be held responsible for identifying any or all such patent rights. Their preparation is entrusted to technical committees. It constitutes a technical revision.


The text of this part of IEC is based on the following documents: The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. It was established on the basis of the fourth edition of that standard. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter.


To this end and in addition to other activities. Safety requirements for electric fence energizers. Safety of household and similar electrical appliances. This second edition cancels and replaces the first edition published in and its amendment 1 All Jurisdictions.

This is a free preview. Purchase the entire publication at the link below: This is a free 6 page sample. Standards referenced in Australian legislation Do you want to know when a Standard has changed? Learn about LexConnect. Part Particular requirements for electric fence energizers Looking for additional Standards?

Standards and Suppliers Database of European Law. IEC Ed. Contact Us. Flag for inappropriate content. Related titles. As NZS The maximum temperature for the I2 phase or the maximum solubilization of water into the I2 phase increases with increasing the EO-chain length as is shown in Figure 3b-c. In the case of normal-type self-organized structures, the thermal stability is related to the hydrophobic-chain length.

When the EO-chain length is On the other hand, an aqueous micellar solution phase Wm is formed, and both I1 and H1 phases are successively produced at a high concentration of surfactant in the water-Si5.

norma nbr 5419 pdf

The present phase diagrams clearly show that the surfactant layer curvature tends to be negative as the hydrophobic chain length of surfactant increases and reversetype self-organized structures are formed. On the other hand, the surfactant layer curvature tends to be positive when the EOchain length increases and normal-type self-organized structures are formed in a long-EO-chain surfactant system. Note that a discontinuous reverse micellar cubic phase I2 is rarely formed in ordinary hydrocarbon surfactant systems, although it is formed in some phospholipid,27 polyoxypropylene-polyoxyethylene copolymer,28 and sugar-related surfactant systems.

The corresponding EO number is also plotted on the right-hand axis.

abnt nbr 5419 pdf

The same kind of phase diagrams were constructed for trisiloxane-type nonionic surfactant, polyoxyethylene dodecyl, or oleyl ethers. The, I2 phase was identified by its appearance extremely viscous, transparent and optically isotropic , and from its position on the phase diagram, its structure could not be determined because only one SAXS peak was observed.

It is considered that the I2 phase consists of a discontinuous-type reverse micellar cubic phase because it exists between the surfactant liquid Om and the H2 phases.

Since the boundary was determined by visual inspection, the accuracy is low compared with other boundaries. However, the interlayer spacing measured by SAXS is continuously increased with increasing water content in the single LRphase region when the EO-chain length is fixed. It is sure that there is a single-phase region up to the phase boundary.

The boundaries between two-phase regions were determined by direct observation and optical microscope. In the case of CEOn system, the H2 phase is formed between n 2.

It is well-known that the hydrophile-lipophile balance HLB of surfactant and the macroscopic phase behavior are highly related with each other. In fact, both hydrophilic and hydrophobic chain lengths affect the surfactant layer curvature in the present systems. The EO-chain ranges for various self-organized structures in a dilute region of some water-nonionic surfactant systems are summarized in Table 1. For the same type of self-organized structure to be formed, the ratio between the EO-chain length and the hydrophobic chain length should be equal even for the present silicone surfactants as far as a linear straight chain surfactant is concerned.

However, the maximum length is 1 nm in its extended form, and it is much shorter than the oleyl group, 2. Consequently, as far as polyoxyethylene-type nonionic surfactants are concerned, the HLB number can accurately predict the types of self-organized structures, including silicone surfactants, if the lipophilic moiety is a straight chain. The HLB number concept is somewhat in contradiction with the so-called packing model, in which the hydrophobic chain-length is essentially neglected.

In the packing theory, if the same type of self-organized structure is considered, the hydrophobic chain length does not affect the packing parameter because it is usually assumed that VL and leff vary proportionally for a linear-chain surfactant.

The aS should be also constant if the head is the same. However, the experimental results show the opposite tendency as is shown in Table 1. SAXS Results. To analyze the detailed structures of each liquid crystal, we measured the interlayer spacings of I1, I2, H1, H2, and LR phases as a function of surfactant concentration in each binary water-surfactant system by means of small-angle X-ray scattering.

The reciprocal spacings of these peaks are found to be in the ratio 1:x for theH2 phase, for the LR phase, 1:x for the H1 phase, and x3:x4:x8:x11 for the I1 phase. We consider that the four peaks in the I1 phase represent diffractions from the , , , and planes, respectively. The J. Figure 6. Quick links. Post Reply. Will be grateful for any help!

European Journal of Organic Chemistry: Table IV McKoy Suite. Heinemann HST.


Study number. Genentech, Inc. Chari et al. Colorectal Cancer Incidence Trends in the United Research www.

This article cites 47 articles, 9 of which you can access for free at:. Conventional free air thermal current Ith. The Bearing Housings ; Bearing with tapered bore Bearings with a tapered bore are mounted onto the shaft with the aid of an adapter sleeve. Here the tolerance of the shaft may be higher than for bearings with a cylindrical bore.Further information on IEC publications This is a free 6 page sample.

If our oceans are more than a few metres deep, this exceeds the threshold energy at which the oceans would boil before radiation would kill the tardigrade. Ng Mei Eng.

This association is highly regulated by extracellular glucose and can be stabilized by intracellular metabolites, which are allosteric activators of PFK. The energy requirements for total sterilisation of the planet through atmospheric removal are significantly greater than those for boiling the oceans, so the threat of atmospheric removal is contained within that of oceans boiling.

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