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It was pointed out that cloud computation and platform technology was core of system of mine Internet of things. Technical objectives and main functions of the cloud computation platform of mine Internet of things were introduced. Key technologies of the cloud computation platform of mine Internet of things were expounded including platform architecture based on cloud interaction data pipeline, intelligent resource management and control model and load balancing algorithm, task scheduling and resource dispatching scheme, real-time and heterogeneous data exchange of mine, quick coding and sending in the batch of control command, quick data extraction and packing in the batch, and mine application oriented pushing. Research method and technical route of each technology were given. The paper lays a technical foundation for building a complete, advanced and universal cloud computation platform of mine Internet of things.

Development of fuel cells is greatly hindered by their sluggish oxygen reduction reaction (ORR). Therefore, rational design and cost‐effective fabrication of ORR catalysts with high activity and durability are of paramount importance to the commercialization of fuel cells. In this work, we develop one‐step synthesis of nitrogen‐doped Fe/Fe3C‐encapsulated graphitic layers/carbon nanotubes (Fe/Fe3C@NGL‐NCNT) for ORR. The interpenetration of the two‐dimensional (2D) NGL and the one‐dimensional (1D) NCNT conduces to the construction of three‐dimensional (3D) network structure. Such heterostructure renders Fe/Fe3C@NGL‐NCNT with different catalytically active sites and improved mass transfer. Fuethermore, the inimitable NCNT with winding earthworm‐like structure and a small diameter of below 10 nm provides plentiful active defect sites. Consequently, the synergistic effect of unique 1D/2D/3D heterostructure endows Fe/Fe3C@NGL‐NCNT catalyst with a superior activity and durability compared to commercial Pt/C catalyst. This work provides worthy inspiration for engineering excellent ORR electrocatalysts by integrating 1D/2D/3D materials with different catalytically active conponents into one heterostructure via in situ synthesis. [ABSTRACT FROM AUTHOR]

Objective: To compare the prevalence of hypertension between low birth weight infant (LBWI) women and non-LBWI women., Methods: A retrospective cohort study was applied and 3 172 pregnant women giving births during October 1976 to December 2008 in our hospital and underwent physical check-up between 2010 and 2011 at the Kailuan medical group were included and divided into LBWI group and non-LBWI group by the history of LBWI. Prevalence of hypertension was obtained during the follow-up program. Multiple logistic regression analysis was used to assess the relative risk of hypertension., Results: A total number of 3 172 women, with an average age of 42.3 years old were divided into LBWI group (n = 147) and non-LBWI group (n = 3 025), with the average birth weights of their infants were 2.31 kg and 3.39 kg, respectively. The prevalence of hypertension from the follow-up program was significantly higher in LBWI group than that in the non-LBWI group (23.8% vs. 16.9%, P < 0.05). After adjustment for other traditional risk factors, the risk of hypertension in LBWI group was 1.60 (95%CI:1.02-2.53) folds higher than that in the non-LBWI group., Conclusion: Prevalence of hypertension in women with LBWI was higher than that in those women without LBWI. History of LBWI seemed to have had an increased risk to develop hypertension.