CEN

The experimental conditions used to determine the CFPP do not exactly reflect those observed in vehicles the differences are due to the spaces in the filter mesh which are much larger in the laboratory filter, the back-pressure and the cooling rate. Also, research is continuing on procedures that are more representative of the actual behavior of diesel fuel in a vehicle and which correlate better with the temperature said to be operability , the threshold value for the Incident. In 1993, the CEN looked at two new methods, one called SFPP proposed by Exxon Chemicals (David et al., 1993), the other called AGELFI and recommended by Agip, Elf and Fina (Hamon et al., 1993). 

At the European level, the national organizations from both the EU (European Union, formerly the EEC) and the EETA (European Free Trade Association) are grouped in the CEN (European Committee for Standardization) and its counterpart for the electrical industries CENELEC. The standards published by these two organizations have authority in all EU countries as well as the EFTA countries who have voted their approval, which means that these standards have replaced their corresponding national standards. 

CEN TC 138 (Non-destructive Testing) WG 7 (Acoustic Emission) Draft for General Principals"... 

CEN TC 54 (Unfired pressure vessels) WG E (Testing and inspection) Draft for the EN Standard"... 

For some years now, standards for radioscopic applications have been in the drafting stage. This paper will discuss the present state of the preparations that the ad hoc working group "Radioscopy" of IIW, CEN and ISO is involved in. 

As described higher, the VERAPUS prototype system is designed to verify the ultrasonic flaw detectors used for non destructive testing, in the field of periodical amuially performed verifications which are described in CEN projects. 

Declare the conformity or non conformity of the particular flaw detector under test, in accordance with the criteria of CEN standards. 

Characterisation and verification of equipment instrument CENTC 138-WG2 N176 Characterisation and verification of equipment CEN TC 13 8-WG2 pr EN 12668-3 Characterisation and verification of equipment... 

The first stage in any inspection is to generate a proeedure which is specific to the component being examined in many instances, such a procedure will be based on a standard such as CEN J5I/-EN1714 Non-Destructive Testing of Welds - Ultrasonic Examination of Welded Joints . CamuS incorporates a tool ProcGen to provide assistance with this task. 

CEN/TC138/AHG3 includes members from 7 organizations, representing 5 countries ... 

The ad hoc group has met 10 times between its inaugural meeting, in March 1995, under the presidence of Mr. PRIESTER, secretary of CEN/TC138, and September 1997. 

In parallel, the ad hoc group has organized a seminar open to all the disciplinary working groups of CEN/TC138. This meeting, held in September 1996 in Paris, had several aims ... 

The seminar was attended by the secretary of CEN/TC138. Tlie representativity of the working groups was satisfactory, since 6 out of 8 were represented. Feedback was received from several working groups and taken into account in the final draft. 

Information on CEN/TC138/AHG3, such as the draft document, the minutes of meetings, the list of references and the members addresses, may be obtained on Internet on the BAM server at http //trappist.kb,bam-berlin.de/CEN/cenalig3.html. 

NDT equipment imported in lots in the process of state testing are examined both on their conformity to the requirements of safety standards (ISO, CEN, lEC) and standards of the manufacturer and its availability for calibrartion in service. 

In stead, the electrostatic con tribn tion conies from definin g a set of bond dipole moments associated woth polar bonds. These bond moments are defined in the m m psir.LxL(dbf) file along with the bond stretching parameters and are given in units of Debyes. The cen ter of th e dipole Is defined to be th e m Idpoint of the bond an d two dipoles p. and pj. separated by Rjj. as shown beltnv ... 

Like MM2, MM+ in eludes eonplin g bcLween bond slrcLcb ing an d angle bending. If the angle is defined lo include aloms i, j, and k, where k is lb e cen iral atom, ih en MM + couples slrelch in g of the ik and jk bonds wilb ibc angle ... 

For XH bonds, where X isany heavy atom, the hydrogen electron den sity is ri ot th ough t to be cen tered at th e position of th e hydrogen n ueleus but displaced alon g th e bon d sorn ewhat, towards X. The MM+ force field reduces the XH bond length by a factor of 0.9 I 5 strictly for th e purposes of calculatin g van der Waals in teraction s with hydrogen atoms. 

I h e -M. l+ force field assigns default values for out of plane bending terms around an sp2 center. If a central atom has some out of plane parameters, then the first out of plane parameter involving th at cen tral atom is used if a specific parameter is n ot foiin d. 

Using the same nomenclature as for the INDO approximation, the elements of the MfNDOfS UHFFock matrix are described below. When < )j an d d tti iJ on different cen lers the off-diagonal elem en ts are... 

The cIcniciiLs of the MNDO Fock niairix bused on thenef/lecL of diuLmnic din ereii liul overlap approximaiion are described below. When and dy are on dilTeren L cen ters the oIT-diagonal elemen Is of 111 e Hock matrix ai e ... 

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