A NEW SYNTHETIC APPROACH TO PHOSPHONOPEPTIDE WITH PHOSPHONAMIDE MOIETY

A novel tricomponental condensation leading to p-nitrophenyl- ethyl hydrogen substituted benzylphosphonates was described.The use of these compounds for the synthesis of phosphonopeptide with phosphonamide moiety was demonstrated.

Strata Architectural Variability and Facies Distribution in a Structural Transfer Zone: A Case Study of Fushan Sag, Northern South China Sea

Structural transfer zones in a half-graben rift basin play a significant role in controlling sandy sediments and providing a target for hydrocarbon exploration. Previous studies have classified the transfer zone in lacustrine environments into two different patterns: synthetic approaching transfer zones and synthetic overlapping transfer zones. However, the evolution of the depositional pattern and the controlling factors of the above transfer zones are still unclear. In the Fushan Sag, the northern South China Sea, an overlapping transfer zone developed in the early Eocene Epoch, while a synthetic approaching transfer zone developed in the late Eocene, due to tectonic uplift. This evolutionary process provided an opportunity to study the stacking pattern of strata architectural variability and facies distribution in the structural transfer zone of the Eocene lacustrine basin. In this study, following the indications of the oriented sedimentary structures in core samples and heavy mineral assemblages of 18 wells, the evolution of the paleo-hydrodynamic distribution during the early and late Eocene has been reconstructed. The sequence-stratigraphy was then divided and the sand body parameters calculated, according to the seismic data and well log interpretations. During the early Eocene, the lake level was at a low stand, the faults broken displacement in the East block being over 50 m. The prograding delta and turbidites are oriented perpendicular to the structural transfer zone. According to the quantitative analysis of the flow rate and the depositional parameters, we speculate that gravity transportation of the sediment and the sediment-supply are the dominating factors during this period. Up to the late Eocene, the rising lake level and the decreased fault displacement leads the flow to divert to a NE-direction, resulting in it being parallel to the axis of the transfer zone. Thus, we speculate that the accommodation space is predominant in this period. In comparison with the above two periods, a braided river delta with an isolated sand body and turbidites developing in the deep area is prominent in the overlapping transfer zone, while a meandering river delta is characteristic of the synthetic approaching transfer zone.

A Facile Synthetic Approach to Reduced Graphene Oxide-Fe_3O_4 Composite as High Performance Anode for Lithium-ion Batteries

Reduced graphene oxide-Fe3O4（rGO—Fe3O4） composite has been prepared via a facile and effective hydrothermal method by synthesizing Fe3O4 nanospheres on the planes of reduced graphene oxide（rGO）.Characterizations suggest the successful attachment of Fe3O4 nanospheres to rGO sheets.The rGO—Fe3O4composite（66.7 wt%of Fe3O4 in the composite） exhibits a stable capacity of 668 mAh g-1 without noticeable fading for up to 200 cycles in the voltage range of 0.001—3.0 V,and the superior performance of rGO-Fe3O4 is clearly established by comparison of the results with those from bare Fe3O4 nanospheres（capacity declined to 117 mAh g-1 only at the 200 th cycle）.The excellent electrochemical performance of rGO—Fe3O4 composite can be attributed to the fact that the uniform dispersion of the Fe3O4 nanospheres growing on the rGO sheets avoids aggregation during Li uptake-release cycling,which is desired for cycle stability.Meanwhile,the rGO sheets afford not only elastic buffer to alleviate the volume variations of Fe3O4nanospheres,but also good ionic and electronic transport medium in the electrode.

A Facile Synthetic Approach to 3-Halo-4-substituted-l,5-dihydro-4H-1,2,4-triazoline-5-thiones Based on Retro-Michael Addition

A facile 3-step synthetic approach to 3-halo-4-substituted-l,5-dihydro-4H-1,2,4-triazolme-5-thiones （la--lk） from corresponding unhalogenated 8a---8i was developed based on the strategy of retro-Michael addition, with the key steps being regioselective S-alkylation of compounds 8a-8i with ethyl 3-iodopropionate（12c） and alkaline cleavage of the propionate protecting group via retro-Michael addition. The synthetic approach was characterized by simplicity of operation and wide substrate scope.

Praxis and Theory Combined： Introduction to ＂New Perspectives on New Media＂

Concerning the rise of new media and the imperative to make sense of it in our social world, this collection of essays aims to bring into our studies on new media and communication research some fresh perspectives, both theoretical and practical. Scholars from different areas of expertise contribute to the topic of new media studies by laying bare certain fabrics, structures, and mechanisms that have been operating behind the veil of our prereflective ignorance.