Contractional Cornucopia on Offshore Angola

Three main contractional tectonic regimes are recognized: (1) Late Cretaceous gravity spreading, (2) Mid-Tertiary uplift, and (3) Neogene transpression. Tilting of the young continental margin created the first tectonic regime, the ultimate cause of this was thermal subsidence after continental breakup. The second regime was the direct cause of the uplift of the Angolan coast, mostly in the Oligo-Miocene but continuing into the Plio- Pleistocene, while the late tectonic regime was probably the differential movement of reactivated crustal blocks, whose slip directions depended on their orientation

Contractional Cornucopia on Offshore Angola

Three main contractional tectonic regimes are recognized: (1) Late Cretaceous gravity spreading, (2) Mid-Tertiary uplift, and (3) Neogene transpression. Tilting of the young continental margin created the first tectonic regime, the ultimate cause of this was thermal subsidence after continental breakup. The second regime was the direct cause of the uplift of the Angolan coast, mostly in the Oligo-Miocene but continuing into the Plio- Pleistocene, while the late tectonic regime was probably the differential movement of reactivated crustal blocks, whose slip directions depended on their orientation

The Story of Teamwork and the Birth of the FFP* (Filter Backpack)

Soon after the outbreak of the coronavirus crisis in the Czech Republic and the first lockdown (2020), we enthusiastically decided to fight the coronavirus with scientific \nmeans. Originally materials engineers, we decided to develop an effective protective respiratory device, which was in short supply at the time. We soon found out, that every textile material (handkerchief 10%) has a certain ability to catch an aerosol particle carrying the corona virus, the slower the aerosol particle (d<300 nm) passes through the filter, the greater the chance it has of being caught, with the thickness of the filter, the amount of passed particles decreases exponentially and breathing resistance increases linearly. On this basis, we decided to experiment with a large-area filter placed on the user's back (it wouldn't fit anywhere else) and commercially available textile filter material

Synthesis, Characterization, and Reactivity of ansa-Bis(allyl) Lanthanide Complexes, a New Class of Single-Component Methyl Methacrylate Polymerization Catalysts

The reaction of the dipotassium salt K2{3-(C3H3SiMe3-1)2SiMe2} with LnCl3 in THF leads to the formation of the new ansa-allyl lanthanate complexes [Ln{(?3-C3H3SiMe3)2SiMe2}2{µ-K(THF)}·nTHF]8 ( 1 , Ln = La, n = 0.5; 2 , Ln = Y, n = 1; 3 , Ln = Sc, n = 1). Reaction of K2{3-(C3H3SiMe3-1)2SiMe2} with NdI3(THF)3.5 affords THF-free [Nd{(?3-C3H3SiMe3)2SiMe2}2(µ-K)]8 ( 4 ). Treatment of SmI2(THF)2 with Li{3-(C3H3SiMe3-1)2SiMe2}/KOtBu resulted in the samarium(III) complex [Li(OEt2)4][Sm{(?3-C3H3SiMe3)2SiMe2}2] ( 5 ), albeit in small yield. Whereas the crystal structure of 1 shows a coordination polymer, with potassium bridging to allyl moieties of two neighboring lanthanide units and close K···CH3Si contacts, complex 5 consists of discrete ions. The complexes 1 - 5 are all found to be efficient catalysts for the polymerization of methyl methacrylate to high-molecular-weight polymers under a variety of conditions, with 2 at 0 °C giving extremely high turnovers of 86 400 mol of MMA (mol of Y)-1 h-1