Design of efficient CO2 adsorbent is an effective way to capture CO2. Bamboo-derived activated carbon isa promising CO2 adsorbent. Inspired by this, carbonized unidirectional polyimide (CUPI) ...aerogels werenewly designed by the ice templating method using directional freezing technology. The pore propertyof CUPI aerogel can be tuned by changing the solidification velocity, and a series of CUPI aerogels weredesigned to explore the CO2 capture performance in view of pore morphology/topology. As a result,the obtained CUPI-8 exhibits higher CO2 adsorption capacity compared to carbonized polyimide aerogelsdue to the synergistic effect of micropores and lamellar pores. Specially, the CO2 adsorption capacity overCUPI-8 can be up to 5.75 mmol/g at 20 bar and 298 K. Furthermore, the adsorption isotherm of CUPI-8still shows an upward trend even nearly 20 bar. The isosteric adsorption heat (Qst) value of CUPI-8 isnearly in the ideal scope of 30–50 kJ mol1. The efficient CO2 adsorption performance and good chemicalstability of CUPI aerogel makes it a promising absorbent for practical application. This work provides anew opportunity for researching the effect of pore morphology/topology and the synergistic effect ofhierarchical pores on CO2 capture. KCI Citation Count: 0
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Based to the first-principles calculations, we study the electronic properties of graphene/MoS2 heterostructure by modulating the vertical strains and applying external electric field. Graphene/MoS2 ...heterostructure is a van der Waals heterostructure (vdWH) with the interlayer spacing is 3.2 Å for the equilibrium state, and the contact property of the interface is n-type Schottky contact. The Schottky barrier height (SBH) changes with vertical strains which induces a change of charge transfer between graphene and MoS2 layer. In addition, with strain or without strain, the applied positive electric field can effectively promote the charge transfer from graphene to MoS2, while the negative electric field has the opposite effect. These findings support for the design of field effect transistors based on graphene vdWHs.
Display omitted .The interface contact properties of graphene/MoS2 heterostructure are modulated by strains and applied electric field, which contributes to the development of new nano electronic devices.
•The electronic properties of graphene/MoS2 can be modulated via strain and electric field.•Schottky barrier height is determined by charge transfer between graphene and MoS2 layers.•These findings support for the design of field-effect transistors based on graphene vdWHs.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Thermoresponsive polymers are of great importance in numerous nanotechnological and biomedical applications. Compared to polymers that undergo a lower critical solution temperature (LCST) phase ...transition in aqueous solution, i.e., demixing occurs upon heating, polymers exhibiting the reversed upper critical solution temperature (UCST) behavior in aqueous solution have been much less documented as it is more challenging to achieve this behavior in aqueous solutions. Furthermore, the high sensitivity of UCST behavior to minor variation in polymer structure and solution composition hampered the development of applications based on these polymers 18. However, polymers with UCST transition in alcohol/water solvent mixtures are more commonly reported and exhibit promising properties for the preparation of ‘smart’ materials. This review will focus on the theory and development of such polymers with UCST behavior in alcohol/water solvent mixtures. By highlighting reported examples of UCST polymers in alcohol/water solvent mixtures, we aim to demonstrate the versatility and potential that such UCST polymers possess as biomedical and ‘smart’ materials.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The integration of artificial intelligence (AI) across various domains marks a significant trend in contemporary development, with its application in English translation teaching in higher education ...emerging as a focal area of research. In response to the evolving needs of English translation instruction, this study advocates for a novel AI-supported teaching method leveraging a translation system. We incorporate a multi-hop attention mechanism within a Long Short-Term Memory (LSTM) network to develop an intelligent neural network machine translation model. This model is enhanced with a meta-learning recommendation algorithm, which delivers personalized translation learning materials to students, facilitating an intelligent teaching paradigm. The efficacy of this innovative teaching method was empirically tested by assessing its translation performance prior to classroom implementation. The evaluation involved comparative tests on English-to-Chinese and Chinese-to-English translation. The results reveal that students taught under this AI-enhanced model scored mean values of 27.68 and 37.42 in these respective tests, exhibiting statistically significant improvements over those taught via traditional methods (P<0.05). The findings suggest that the intelligent translation teaching system proposed in this study holds promising potential for redefining English translation teaching frameworks in universities, indicating a substantial stride toward the integration of AI in educational methodologies.
A highly efficient light-driven photocatalytic TiO2–Au Janus micromotor with wireless steering and velocity control is described. Unlike chemically propelled micromotors which commonly require the ...addition of surfactants or toxic chemical fuels, the fuel-free Janus micromotor (diameter ∼1.0 μm) can be powered in pure water under an extremely low ultraviolet light intensity (2.5 × 10–3 W/cm2), and with 40 × 10–3 W/cm2, they can reach a high speed of 25 body length/s, which is comparable to common Pt-based chemically induced self-electrophoretic Janus micromotors. The photocatalytic propulsion can be switched on and off by incident light modulation. In addition, the speed of the photocatalytic TiO2–Au Janus micromotor can be accelerated by increasing the light intensity or by adding low concentrations of chemical fuel H2O2 (i.e., 0.1%). The attractive fuel-free propulsion performance, fast movement triggering response, low light energy requirement, and precise motion control of the TiO2–Au Janus photocatalytic micromotor hold considerable promise for diverse practical applications.
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Ultrasound and vacuum were respectively employed to enhance CO
2
desorption in a water scrubbing biogas upgrading system. Results showed that incomplete CO
2
desorption could cause a high CO
2
...content in the water and seriously affect the purity of the product gas. Vacuum had a strong enhancement effect on CO
2
desorption. When a vacuum of 0.04 MPa was used to enhance CO
2
desorption, the amount of the stripping air could be reduced to 1/16-th of that without enhancement, indicating that vacuum could greatly enhance CO
2
desorption and significantly decrease the amount of the stripping air, which was expected to reduce a large amount of energy consumption. In contrast, the enhancement effect of ultrasound was not so obvious for CO
2
desorption in the desorption column with air stripping, since the solution could be well desorbed by gas stripping, though ultrasound could strongly affect the static CO
2
desorption.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Per- and polyfluoroalkyl substances (PFASs) contamination in the Bohai Sea and its surrounding rivers has attracted considerable attention in recent years. However, few studies have been conducted ...regarding the distribution of PFASs in multiple environmental media and their distributions between the suspended particles and dissolved phases. In this study, surface water, surface sediment, and air samples were collected at the Bohai Sea to investigate the concentration and distribution of 39 targeted PFASs. Moreover, river water samples from 35 river estuaries were collected to estimate PFAS discharge fluxes to the Bohai Sea. The results showed that total ionic compound (Σi-PFASs) concentrations ranged from 19.3 to 967 ng/L (mean 125 ± 152 ng/L) in the water and 0.70–4.13 ng/g dw (1.78 ± 0.76 ng/g) in surface sediment of the Bohai Sea, respectively. In the estuaries, Σi-PFAS concentrations were ranged from 10.5 to 13500 ng/L (882 ± 2410 ng/L). In the air, ΣPFAS (Σi-PFASs + Σn-PFASs) concentrations ranged from 199 to 678 pg/m3 (462 ± 166 pg/m3). Perfluorooctanoic acid (PFOA) was the predominant compound in the seawater, sediment, and river water; in the air, 8:2 fluorotelomer alcohol was predominant. Xiaoqing River discharged the largest Σi-PFAS flux to the Bohai Sea, which was estimated as 12,100 kg/y. Some alternatives, i.e., 6:2 fluorotelomer sulfonate acid (6:2 FTSA), hexafluoropropylene oxide dimer acid (HFPO-DA), and chlorinated 6:2 polyfluorinated ether sulfonic acid (Cl-6:2 PFESA), showed higher levels than or comparable concentrations to those of the C8 legacy PFASs in some sampling sites. The particle-derived distribution coefficient in seawater was higher than that in the river water. Using high resolution mass spectrometry, 29 nontarget emerging PFASs were found in 3 river water and 3 seawater samples. Further studies should be conducted to clarify the sources and ecotoxicological effects of these emerging PFASs in the Bohai Sea area.
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•Thirty-nine PFASs were quantified in water, sediment and air from the Bohai Sea and its rivers.•The Kd between dissolved and particle phases in seawater were higher than those in river water.•Discharge of total i-PFASs from 34 rivers was estimated to be 20.6 t/y.•Twenty-nine novel PFASs were screening in sea and river water by HRMS.
This paper revealed the levels and composition of legacy and emerging PFASs in multiple environmental media of the Bohai Sea.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Hyperglycemia activates toll-like receptor 4 (TLR4) to induce inflammation in diabetic cardiomyopathy (DCM). However, the mechanisms of TLR4 activation remain unclear. Here we examine the role of ...myeloid differentiation 2 (MD2), a co-receptor of TLR4, in high glucose (HG)- and diabetes-induced inflammatory cardiomyopathy. We show increased MD2 in heart tissues of diabetic mice and serum of human diabetic subjects. MD2 deficiency in mice inhibits TLR4 pathway activation, which correlates with reduced myocardial remodeling and improved cardiac function. Mechanistically, we show that HG induces extracellular advanced glycation end products (AGEs), which bind directly to MD2, leading to formation of AGEs-MD2-TLR4 complex and initiation of pro-inflammatory pathways. We further detect elevated AGE-MD2 complexes in heart tissues and serum of diabetic mice and human subjects with DCM. In summary, we uncover a new mechanism of HG-induced inflammatory responses and myocardial injury, in which AGE products directly bind MD2 to drive inflammatory DCM.
A novel light-driven Au-WO3@C Janus micromotor based on colloidal carbon WO3 nanoparticle composite spheres (WO3@C) prepared by one-step hydrothermal treatment is described. The Janus micromotors can ...move in aqueous media at a speed of 16 μm/s under 40 mW/cm2 UV light due to diffusiophoretic effects. The propulsion of such Au-WO3@C Janus micromotors (diameter ∼ 1.0 μm) can be generated by UV light in pure water without any external chemical fuels and readily modulated by light intensity. After depositing a paramagnetic Ni layer between the Au layer and WO3, the motion direction of the micromotor can be precisely controlled by an external magnetic field. Such magnetic micromotors not only facilitate recycling of motors but also promise more possibility of practical applications in the future. Moreover, the Au-WO3@C Janus micromotors show high sensitivity toward extremely low concentrations of sodium-2,6-dichloroindophenol (DCIP) and Rhodamine B (RhB). The moving speed of motors can be significantly accelerated to 26 and 29 μm/s in 5 × 10–4 wt % DCIP and 5 × 10–7 wt % RhB aqueous solutions, respectively, due to the enhanced diffusiophoretic effect, which results from the rapid photocatalytic degradation of DCIP and RhB by WO3. This photocatalytic acceleration of the Au-WO3@C Janus micromotors confirms the self-diffusiophoretic mechanism and opens an opportunity to tune the motility of the motors. This work also offers the light-driven micromotors a considerable potential for detection and rapid photodegradation of dye pollutants in water.
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IJS, KILJ, NUK, PNG, UL, UM
We propose a self-supervised learning method to uncover the spatial or temporal structure of visual data by identifying the position of a patch within an image or the position of a video frame over ...time, which is related to Jigsaw puzzle reassembly problem in previous works. A Jigsaw puzzle can be seen as a shuffled sequence, which is generated by shuffling image patches or video frames according to an unknown permutation. The task of predicting the visual permutations can be used to train a learning system to capture structural information which is important for semantic-level tasks, such as object recognition and action recognition. To this end, we propose a multi-task learning framework where a group of principal tasks aims to predict the index of each sample in the original sequence, and a group of auxiliary tasks aims to predict the spatial or temporal relation of adjacent samples in the shuffled sequence. Our scheme can handle the whole space of permutations and is fairly scalable, and it is also generic to solve many problems such as self-supervised representation learning, relative attributes, and learning to rank. Our method achieves state-of-the-art performance on the STL-10 benchmarks for unsupervised representation learning, and it is competitive with state-of-the-art performance on UCF-101 and HMDB-51 as a pretraining method for action recognition. In addition, we apply the proposed method on age comparison task to prove it is generic to solve ranking problems.
•The proposed method is capable of handling the whole space of permutations.•The designed architecture is flexible and extensible.•Our method achieved the state-of-the-art performance on STL-10.•Our method is generic to solve ranking problem.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
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