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The topic of mechanics has been taught in a secondary school in Amsterdam by a method which starts from students’ real-life experiences and uses Interactive Video and a Microcomputer-Based Laboratory (IV/MBL). Student responses were found to be appreciative and their results in tests showed a considerably better grasp of basic mechanics concepts than for comparable students taught by more traditional methods.

The spectral profile of an isolated absorption line is related to the plasma dispersion function and/or the complex error function. A simple method for computing such profiles is given. The results can also be applied to calculation of the spectral profile emitted by a lamp.

By the end of 1970, the European Space Research Organisation had reached a turning point. The Organisation had undoubtedly furnished proof of ist maturity in the technological and management aspects of a common space programme, it had succeeded in giving leadership to European industry by creating a unified centralised management of industrial contracts, and four satellites had been launched successfully, all designed and built in Europe. There was a spirit of mutual confidence and goodwill with the European scientific community, and the technological success rate of sounding-rocket launches, which is a measure of the service provided by ESRO to the experimenters, had, in 1970, reached 85%.

Since 1 January 1972, the office of Chairman of the Central Commission for the Navigation on the Rhine has been held by Mr. Guy de Lacharriere, Commissioner for France, and that of Vice-Chairman by Professor W. Riphagen, Commissioner for the Netherlands.

13–15 janvier: Comite de coordination des telecommunications par satellites (CCTS) a Lausanne

Following the Report of the European Civil Aviation Conference held in Strasbourg 29th November-16th December, 1955, extracts of which were included in the Documentary Section of Volume III of the European Yearbook, it was decided to print in Volume IV the Report on E.C.A.C. developments since 1 April, 1956, which was submitted to the Council of I.C.A.O. at its 29th Session by the Chairman of the Air Transport Committee of the Council.

La periode allant du 1er juillet 1971 au 30 juin 1972 a vu un nouvel accroissement des activites du Conseil.

Au cours des dernieres annees, l’attention des savants s’est portee sur certaines particules elementaires recemment detectees, dites mesons, qui sont produites par le rayonnement cosmique provenant de l’espace extraterrestre et peuvent etre observees sur terre. On tend a croire que ces particules se produisent a l’interieur du noyau atomique sous des conditions tres speciales. Par leur etude, les savants esperent en apprendre toujours plus sur la structure du noyau. Malheureusement les particules naturelles provenant de l’espace nous parviennent a une frequence independante de notre volonte et les travaux des stations d’observation, perchees au sommet des montagnes, telle la station du Junfraujoch, ne progressent qu’avec lenteur.

The Council of Ministers of Transport met twice in 1956 : on 22nd March, in Paris and on 17th October, in Munich. The Committee of Deputies, for its part, has held 7 regular sessions since the Bern meeting of the Council of Ministers (in October, 1955), apart from a special meeting with the non-governmental organisations concerned, devoted to the financial situation of the railways. In the first stages of its work, it was assisted by the following subsidiary bodies

In the last few years much attention has been given to certain newly observed subatomic particles known as high energy mesons, which can be detected on earth, coming from outer space. These particles, it is believed, are produced within the atomic nucleus under very special conditions. It is also believed that by their study man could learn far more about the internal structure of the nucleus. Unfortunately, the natural particles from outer space arrive at a frequency independent of man‘s will, and the stations for this research, perched on mountain tops such as the one at the Jungfraujoch, have been able to work only very slowly.

L’Union economique Benelux est basee sur une cooperation intergouvemementale directe. Le Comite de Ministres est l’institution centrale de l’Union et arrete la politique a suivre. Les decisions sont prises de commun accord et executees par les autorites nationales. Une experience de plus de vingt ans a montre que cette forme de cooperation offre largement la possibilite de garantir le developpement efficace et ininterrompu de l’integration economique entre les trois pays.