Leakage detection and localization on water transportation pipelines: a multi-label classification approach

One of the main problems of water transportation pipelines is leak which can cause water resources loss, possible human injuries, and damages to the environment. There are many studies in the literature focusing on detection and localization of leaks in the water pipeline systems. In this study, we have designed a wireless sensor network-based real-time monitoring system to detect and locate the leaks on multiple positions on water pipelines by using pressure data. At first, the pressure data are collected from wireless pressure sensor nodes. After that, unlike from the previous works in the literature, both the detection and localization of leakages are carried out by using multi-label learning methods. We have used three multi-label classification methods which are RAkEL_d, BRkNN, and BR with SVM. After the evaluation and comparison of the methods with each other, we observe that the RAkEL_d method performs best on almost all measures with the accuracy ratio of 98%. As a result, multi-label classification methods can be used on the detection and localization of the leaks in the pipeline systems successfully.

     

Comprehensive investigation of butyl stearate as a multifunctional smart concrete additive for energy‐efficient buildings

Using of phase change materials (PCM) for increasing energy savings in sustainable buildings is receiving a lot of interest in commercial applications. Butyl stearate (BS), as PCM, can be used to maintain ambient temperature in the human comfort zone and prevent temperature fluctuations by enhancing the thermal properties of concrete. The long‐term effects of BS on concrete are not well known. In this study, the applicability of BS, as a smart concrete additive, by direct incorporation in the concrete structure was investigated comprehensively including thermal, rheological, and corrosion behaviour. The thermal characterization of PCM was achieved using DSC, TGA, thermal conductivity, and thermal buffering experiments. Thermal storage capacity of BS was measured to be 134.2 J/g, which is high enough to be used for passive solar energy storage in buildings. The fresh concrete experiments revealed that workability and flowability of fresh concrete mixes were improved. The maximum hydration temperature was reduced, and a retarding effect was observed by the addition of BS. Moreover, the corrosion behaviour of steel embedded in concrete with BS as PCM was studied in a solution of NaCl (3.5 wt%) representing an aggressive environment by utilizing electrochemical impedance spectroscopy (EIS) for long‐term corrosion tests that lasted for 1 year. The open circuit potential of steel in concrete with BS showed noble potential indicating low corrosion probability. The FESEM images and polarization resistance (R_p) values showed that the addition of BS in concrete decreases corrosion of the rebar in comparison with concrete without BS. Addition of BS not only enhances thermal capacity but also exhibits corrosion protection of rebar by hindering penetration of chloride ions into the concrete.     

Object recognition based on critical nodes

Pattern Analysis and Applications - In recent decades, the need for efficient and effective image search from large databases has increased. In this paper, we present a novel shape matching...     

Nanostructured Polyaniline-rGO decorated platinum catalyst with enhanced activity and durability for Methanol oxidation

Addressed herein, a novel composite material is formed between polyaniline and a reduced graphene oxide synthesized by in situ technique in a single step in order to support the platinum nanoparticles. The surface of the reduced graphene oxide layers appeared effectively and stabilized the metal nanoparticles dimensionally. Platinum@reduced graphene oxide-polyaniline (Pt@rGO-PANI) nanoparticles have been characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. All the results show that Pt@rGO-PANI nanocomposite displayed excellent durability and catalytic activity for the alcohol oxidation reaction. Moreover, the resulting nanocomposite can be used in a variety of carbon-polymer applications, which can be improved and this study provides a powerful and universal synthetic strategy for new polymer-carbon composites in the literature. The methanol oxidation reactions current can reach to 47.2 mA and can maintain 68.4% of the initial value even after 100 cycles.     

Provably optimal sparse solutions to overdetermined linear systems with non-negativity constraints in a least-squares sense by implicit enumeration

Optimization and Engineering - Computing sparse solutions to overdetermined linear systems is a ubiquitous problem in several fields such as regression analysis, signal and image processing,...     

The implication of spatial temporal changes on facial micro-expression analysis

Multimedia Tools and Applications - Facial micro-expression datasets lack consistency and standardisation, with different research groups using various experimental settings, in particular, where...