Ocean wave energy, as one of the most abundant resources on the earth, is a promising energy source for large-scale applications. Triboelectric nanogenerators (TENGs) provide a new strategy for water wave energy harvesting; however, its average performance in realistic water wave conditions is still not high. In this work, a whirling-folded TENG (WF-TENG) with maximized space utilization and minimized electrostatic shielding is constructed by 3D printing and printed circuit board technologies. The flexible vortex structure responds easily to multiform wave excitation with improved oscillation frequency. A standard water wave tank is established to generate controllable water waves to characterize the device performance. It is found to be determined by wave conditions and internal structure, which is also revealed by a theoretical dynamical analysis. The WF-TENG can produce a maximum peak power of 6.5 mW and average power of 0.28 mW, which can power a digital thermometer to operate constantly and realize self-powered monitoring on the TENG network to prevent possible damage in severe environments. Moreover, a self-charge-supplement WF-TENG network is proposed to improve the output performance and stability. This study provides an effective strategy for improving the average power and characterizing the performance of spherical TENG towards large-scale blue energy.long-and-weak power grid from the remote land. To alleviate this long-term energy shortage dilemma, developing renewable and sustainable energy sources is highly desirable for in-place power supply. [1] Water wave energy is deemed to be a promising energy source with the advantage of little dependence on its ambient environment condition. [2] Most water wave energy is distributed in the offshore area benefiting the wave energy conversion as well as equipment maintenance, [3] and the wave transport from open sea to the shore is characterized by a relatively simple direction. Such clean, abundant, and random distributed energy has been exploited by the electromagnetic generator (EMG) technology. [4] However, the EMG is often criticized by its disadvantages of high cost, easily corroded, and low efficiency at the frequency of ocean wave. [5] Recently, triboelectric nanogenerator (TENG), adopting the mechanism of Maxwell's displacement current, has been approved as an effective technology to harvest the water wave energy. [5,6] The TENG can produce higher output performance than the EMG at low frequency, demonstrating its killer application in harvesting low-frequency water wave energy. Various approaches, such as structural design, systematic optimization, material treatment, atmosphere modulation, external excitation, and so on, have been employed to enhance the output performance of TENG in harvesting the water wave energy. [7] However, owing to limitations from the low surface charge density, low oscillation frequency, poor surface contact, dielectric shielding of water, insufficient space utilization, and lacking stability, etc., the average perform...

Side population (SP) cells can be used to identify putative cancer stem cells (CSC), but this technique is

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The “carbon capture, utilization and storage” project has attracted considerable attention in recent years as the demands for reducing CO2 emissions increased. However, the produced fluids during CO2‐enhanced oil recovery (EOR) production are supersaturated with high‐pressure CO2 gas, which leads to serious corrosion damages of the pipelines. To model the corrosive conditions during CO2–EOR production, a self‐designed multiphase flow loop for internal corrosion evaluation was built. The role of flow patterns and emulsification that decisively influencing pipeline corrosion was systematically investigated. It was found that a higher gas‐to‐liquid ratio could be beneficial for reducing pipeline corrosion, which was attributed to a reduction in slug frequency and an enhancement in the stirring effect on the oil–brine mixtures. It was also found that corrosion can be completely inhibited if the transporting liquids were properly controlled under water‐in‐oil emulsion condition. A model considering the transport parameters that ensures the safety of crude‐oil transportation is proposed. It suggests that corrosion control by designing the transport parameters would be a suitable and economic method for tackling the corrosion damages to CO2–EOR pipelines. These ideas have been accepted for guiding the pipeline engineering in the CO2–EOR section of the Shengli oilfield.

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