The geodynamic mechanism of the late Early Cretaceous magmatic flare-up in the collisional zone between the Lhasa and Qiangtang terranes in Tibet is controversial because of a scarcity of robust evidence. To address this problem, we report geochronological, geochemical and Hf isotopic data for the newly discovered Gufeng gabbros from the Duolong Cu-Au mineral district of the western Bangong-Nujiang Suture Zone (BNSZ). The gabbro samples, dated at 126.3 ± 1.8 Ma, show geochemical similarities to typical ocean island basalt (OIB) and have positive εHf(t) values of +3.3 to +6.9. The gabbros were generated by decompression melting of deep upwelling asthenosphere. This event is best explained by slab break-off and the resultant development of a slab window beneath central Tibet.

The stress-softening phenomenon, named as the Mullins effect, can widely occur in filled rubbers after cyclic loading and unloading conditions. The reloading curve is typically below the initial loading curve unless the applied strain exceeds the previously applied maximum strain. Experimental observations have also shown that the Mullins effect can be recovered by annealing the pre-deformed filled rubbers at a high temperature while the recovery level strongly depends on the annealing time and temperature. In this work, we develop a theoretical model to describe the recovery of the Mullins effect by incorporating the dynamic scission and recovery of polymer chains into the eight-chain model. Experiments have also been performed on two types of filled rubbers to validate the theory. The results show that the model is able to capture the main features of the experimental observations including the Mullins effect of virgin specimens and the recovery of the Mullins effect of pre-deformed specimens subjected to different annealed conditions.

Based on the research and indoor experiments, this paper investigates the mixing and curing techniques, pavement performance, and influencing factors of emulsified asphalt cement concrete. The results indicate that mixing sequence of raw material and curing condition have great impact on the strength of the mixture. Adding cement to mixture can improve the pavement performance of mixture greatly. However, increasing the content of emulsified asphalt has opposite effect. Proper content of emulsified asphalt will ensure the bonding strength and waterproof property of the mixture. The critical factors that influence the pavement performance of emulsified asphalt cement concrete are asphalt cement ratio, water cement ratio, content of emulsified asphalt and cement, sand percentage, and aggregate gradation.

A facile preparation of acrylate terminated silicones by the condensation reaction between the readily available silanol terminated silicone fluids and acryloxymethyldimethylacryloxysilane is described. The simplicity of the reaction provides a practical route for the preparation of UV curable silicones. The surprising ease of the reaction between the silane and silanol is attributed to the possible hypervalent silicon transition state even though 29 Si-NMR evidence suggests the silane is tetracovalent.The constant quest for faster curing silicones for various industrial applications has led to many important developments for radiation curable silicones in recent years (1,2). Notable examples among these developments include cationic curing silicones (5-7), free-radical curing thiol-ene (8-10% acrylate or acrylamide (11-14) functional silicones, and photohydrosilylation curing silicones (15)(16)(17). Each of these developments offers certain advantages but at the same time imposes limitations in their applications. Cationic curing silicones using iodonium or sulfonium salts as the photoinitiators for the curing of epoxy and vinyl ether functional silicones allows fast cure without the tacky surface that is often associated with the oxygen inhibition of the acrylate cure. However, the high cost of the photoinitiators and the compatibility of the photoinitiator with silicones are problems. Also, acid generated from the decomposition of the onium salt during UV irradiation is responsible for the cationic cure. However, the acid thus generated remains in the cured silicone network. The presence of the strong acid in a siloxane network clearly begs the question of whether the cured silicone will be durable enough for the intended applications. Thiol-ene crosslingking of mercaptosiloxanes and vinylsiloxanes in the presence of free radical initiator is also well known. The curing is fast and also free of oxygen inhibition. However, the shelf stability of the uncured silicones and the thermal stability of the 170