Tongji University

About: Tongji University is a education organization based out in Shanghai, China. It is known for research contribution in the topics: Population & Adsorption. The organization has 76116 authors who have published 81176 publications receiving 1248911 citations. The organization is also known as: Tongji & Tóngjì Dàxué.

Utilization of CO2 curing to enhance the properties of recycled aggregate and prepared concrete: A review

Abstract: In recent years, the CO2 curing technique has been developed to enhance the properties of recycled aggregate (RA) and recycled aggregate concrete (RAC), materials that can absorb the CO2 gas and are more sustainable for the construction industry. A body of literature on the CO2 curing of RA and RAC is currently available, but a systematic review is lacking. Therefore, this paper reviewed the published literatures on the use of CO2 curing to enhance the properties of the RA and prepared RAC. The studies on CO2 curing technology, the properties of carbonated recycled aggregate (CRA), and the micro-properties, workability, mechanical properties and durability performance of concrete with CRA are respectively reviewed. The results showed that the RA properties, CO2 concentration and pressure, relative humidity and curing time all had a significant impact on the properties of CRA. Carbonation treatment improved the pore structure of RA and reduced its porosity, and the workability, mechanical properties and durability performance of prepared RAC were also improved. In addition, an outlook on the CO2 curing of RA and prepared concrete was presented, and we expected that this work may inform further investigation of the use of CO2 curing to enhance the properties of concrete and cement products.

The Chengzhongcun Land Market in China: Boon or Bane? — A Perspective on Property Rights

Abstract: With the rapid expansion of China's cities since the 1978 economic reform, more and more villages have been swallowed up by urban sprawl. The retention of collective land ownership in chengzhongcun has, on the one hand, made low-rent housing affordable for migrants; on the other hand, however, it has exposed chengzhongcun to many social, economic and environmental problems. Based on a case study of chengzhongcun in Guangzhou, and using an analytical framework of property rights, this article has found that maintaining collective land ownership in chengzhongcun has been socially and economically costly, but a redevelopment strategy without a complementary affordable housing scheme may be problematic. In order to solve the problems of chengzhongcun, an institutional reform of collective land is required.

Circulating microRNAs: novel biomarkers for cardiovascular diseases

Abstract: MicroRNAs (miRNAs) are a novel class of small, non-coding, single-stranded RNAs that negatively regulate gene expression via translational inhibition or mRNA degradation followed by protein synthesis repression Many miRNAs are expressed in a tissue- and/or cell-specific manner and their expression patterns are reflective of underlying patho-physiologic processes miRNAs can be detected in serum or in plasma in a remarkably stable form, making them attractive biomarkers for human diseases This review describes the progress of identifying circulating miRNAs as novel biomarkers for diverse cardiovascular diseases, including acute myocardial infarction, heart failure, coronary artery disease, diabetes, stroke, essential hypertension, and acute pulmonary embolism In addition, the origin and function and the different strategies to identify circulating miRNAs as novel biomarkers for cardiovascular diseases are also discussed Rarely has an opportunity arisen to advance such new biology for the diagnosis of cardiac diseases

Enhanced energy storage density in poly(vinylidene fluoride) nanocomposites by a small loading of suface-hydroxylated Ba0.6Sr0.4TiO3 nanofibers.

Abstract: The ceramic–polymer nanocomposites consisting of Ba0.6Sr0.4TiO3 nanofibers (BST60 NF) with a large aspect ratio prepared via electrospinning and employing surface hydroxylated as fillers and poly(vinylidene fluoride) (PVDF) as matrix have been fabricated by a solution casting method. The nanocomposites exhibit enhanced permittivity, reduced loss tangents and improved breakdown electric field strength at a low volume fraction of hydroxylated BST60 NF. The energy density of the nanocomposites is significantly enhanced, and the maximal energy density of 6.4 J/cm3 is obtained in the composite material with 2.5 wt % hydroxylated BST60 NF, which is more than doubled as compared with the pure PVDF. Such significant enhancements result from combined effect of the large aspect ratio, the surface modification and the improved crystallinity of the nanocomposites induced by the hydroxylated BST60 NF. This work may provide a route for using the hydroxylated ceramic nanofibers to enhance the dielectric energy density i...

Copper as a Robust and Transparent Electrocatalyst for Water Oxidation

Abstract: Copper metal is in theory a viable oxidative electrocatalyst based on surface oxidation to CuIII and/or CuIV, but its use in water oxidation has been impeded by anodic corrosion. The in situ formation of an efficient interfacial oxygen-evolving Cu catalyst from CuII in concentrated carbonate solutions is presented. The catalyst necessitates use of dissolved CuII and accesses the higher oxidation states prior to decompostion to form an active surface film, which is limited by solution conditions. This observation and restriction led to the exploration of ways to use surface-protected Cu metal as a robust electrocatalyst for water oxidation. Formation of a compact film of CuO on Cu surface prevents anodic corrosion and results in sustained catalytic water oxidation. The Cu/CuO surface stabilization was also applied to Cu nanowire films, which are transparent and flexible electrocatalysts for water oxidation and are an attractive alternative to ITO-supported catalysts for photoelectrochemical applications.