ScienceJohn Michels (Journalist) 1955 |
Результаты поиска по книге
Результаты 1 – 3 из 83
Стр. 10
... leads are derived at various times from a system of lead and uranium in which the mean Pb / U ratio has not changed except for radioactive decay since the elements were formed . These investigators feel that this primary radiogenic lead ...
... leads are derived at various times from a system of lead and uranium in which the mean Pb / U ratio has not changed except for radioactive decay since the elements were formed . These investigators feel that this primary radiogenic lead ...
Стр. 11
... lead we have found in iron meteorites , the time of approximate equality is found to be about 4.5 x 109 yr . This can be interpreted to mean that the calculated lead - uranium and lead - thorium ages for the earth agree with the ...
... lead we have found in iron meteorites , the time of approximate equality is found to be about 4.5 x 109 yr . This can be interpreted to mean that the calculated lead - uranium and lead - thorium ages for the earth agree with the ...
Стр. 13
... lead data . These assumptions are ( i ) lead had a uniform isotopic composition throughout the earth up to the time the crust was formed ; ( ii ) when the crust was formed , the Pb / U and Pb / Th ratios in different areas varied ...
... lead data . These assumptions are ( i ) lead had a uniform isotopic composition throughout the earth up to the time the crust was formed ; ( ii ) when the crust was formed , the Pb / U and Pb / Th ratios in different areas varied ...
Содержание
ANNUAL REVIEW | 166 |
PSYCHOLOGY | 189 |
Child Psychology M RadkeYarrow and L J Yarrow | 220 |
Не показаны другие разделы: 5
Другие издания - Просмотреть все
Часто встречающиеся слова и выражения
AAAS acid activity addition Advancement American analysis animals annual appear application Association atomic biology California cells changes chemical chemistry College Committee complete conference containing contributions course Department determined director discussion Division effect electric energy engineering experiments field given Health held important increase indicate industrial Institute interest International Italy John laboratory lead light material means measure mechanics Medical Medicine meeting ment method Michigan natural Notes nuclear observed obtained operation organic percent period physics plant possible prepared present president Press problems professor published recent References reported Reviewed samples School Science scientific scientists Service sessions Society solution structure symposium Table tests theory tion United Univ University values Washington York
Библиографические данные
| Название | Science |
| Редактор | John Michels (Journalist) |
| Соавтор | American Association for the Advancement of Science |
| Опубликована: | 1955 |
| Владелец оригинала: | Университет штата Миннесота |
| Оцифровано | 17 дек 2019 |
| Экспорт цитаты | BiBTeX EndNote RefMan |