## Abstract A fertility index has been estimated which takes into account the spaceβtime variations of mortality rates of children and women and the different fertility rates of women across age groups. The basic data are the recorded frequencies at district level for four decennial census dates (1
β¦ LIBER β¦
The error ellipsoid in phase space of stellar encounters and its evolution in time
β Scribed by R.A. Serafin; B. Birkenbach
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 207 KB
- Volume
- 332
- Category
- Article
- ISSN
- 0004-6337
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## Abstract An important problem for medium temperature polymer electrolyte fuel cells (MT PEMFCs) operating in the temperature range 90β140βΒ°C is the short timeβlife of proton conducting membranes. To shed some light on the empirical annealing treatments used for increasing the membrane durability