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- Ultra-low background 1
- Ultra-strong coupling 1
- Ultracold atoms 1
- ultracold atoms 1
- Ultrafast optics 1
- Ultrafast spectroscopy 1
- ultrafast varifocal lenses 1
- Ultrasound 3
- ultrasound 1
- ultrastable 1
- ultrathin film 1
- Umayyads 1
- Umpolung 1
- UN Climate Change Conference 1
- UN Conference -- Environment and Development – agreements – Pakistan 1
- UN Conference --agreements - Biodiversity Convention-- the diversity of genes and species on the planet. – Pakistan 1
- UN Conference --agreements -- Agenda 21- UN and other international organizations, and non-government bodies 1
- UN Conference --agreements -- Earth Charter a declaration of principles to protect the earth’s natural resources – Pakistan 1
- UN Conference --agreements -Climate Change Convention-- inter-governmental agreement – halt and reverse actions – Pakistan 1
- UN Conference --agreements and a statement on Forest principles. 1