Search

As age increases, children will face more and more adversity. How effectively they cope with stress and difficulties of life is of great significance to the development of children's mental health and academic achievement. However, few studies have explored how different interpersonal relationships and psychological suzhi work together to influence children's healthy behaviors, particularly healthy coping in adversity. Therefore, this research focused on the teacher–student relationships and coping styles, as well as the chain-mediated effects of peer relationships and psychological suzhi. A total of 688 children (360 boys, 52.3%; Mage = 10.98 and SD = 0.89) completed questionnaires that assessed using teacher–student relationships, peer relationships, psychological suzhi, and coping styles. The results indicated that teacher–student relationships correlated positively with coping styles, peer relationships, and psychological suzhi in children. Besides, teacher–student relationships positively affected coping styles through both the mediating roles of peer relationships and psychological suzhi. This research elucidated the extrinsic and intrinsic factors impacting the coping styles of children, thus providing empirical validation of existing theoretical frameworks. In China, interventions aimed at promoting Chinese children's positive coping could benefit from strategies focused on cultivating high-quality relationships and enhancing psychological suzhi. [ABSTRACT FROM AUTHOR]

High-quality Sr2CrWO6 (SCWO) films have been grown on SrTiO3 (STO) substrate by pulsed laser deposition under low oxygen pressure. With decrease of the film thickness, a drastic conductivity increase is observed. The Hall measurements show that the thicker the film, the lower the carrier density. An extrinsic mechanism of charge doping due to the dominance of oxygen vacancies at SCWO/STO interfaces is proposed. The distribution and gradient of carrier concentration in SCWO films are considered to be related to this phenomenon. Resistivity behavior observed in these films is found to follow the variable range hopping model. It is revealed that with increase of the film thickness, the extent of disorder in the lattice increases, which gives a clear evidence of disorder-induced localization charge carriers in these films. Magnetoresistance measurements show that there is a negative magnetoresistance in SCWO films, which is considered to be caused by the magnetic scattering of magnetic elements Cr3+ and W5+. In addition, a sign reversal of anisotropic magnetoresistance (AMR) in SCWO film is observed for the first time, when the temperature varies across a characteristic value, T M. Magnetizationâ€"temperature measurements demonstrate that this AMR sign reversal is caused by the direction transition of easy axis of magnetization from the in-plane ferromagnetic order at T > T M to the out-of-plane at T < T M. [ABSTRACT FROM AUTHOR]

The anatomical characteristics, chemical composition, and physical and mechanical properties of fast-growing Populus × euramericana cv. '74/76' juvenile wood were investigated. Four- to five-year-old clonal plantation trees were harvested from two different experimental sites in the suburbs of Beijing. The Shunyi site had black alkali soil with a planting density of 4 × 6 m and the Miyun site had sandy loam soil with a planting density of 3 × 5 m. The test results showed that the poplar trees from the two sites were both fast growing, with poplar at Shunyi growing faster than at Miyun. There were no significant differences in wood properties between trees grown at the two sites. Fiber length at breast height varied from 872 to 1300 μm between growth rings, average fiber width varied from 21.0 to 25.5 μm and double wall thickness varied from 5.0 to 6.6 μm. Average cellulose, lignin and hemicellulose contents in the samples were 48.9%, 25.4%, and 18.8%, respectively. MFA was higher in the first two growth rings (20-25°), and then decreased rapidly to 12° close to the bark. The average air-dry density at breast height was 401 kg/m3 while the average MOE at breast height was 9.3 GPa. The trees showed large growth rates in both height and stem diameter during the growing season. However, wood properties of the juvenile poplar appeared to be similar to those of poplars with a slower growth rate. [ABSTRACT FROM AUTHOR]

In this study, tissue pharmacology and molecular docking methods were used to investigate the therapeutic effect of cyclomastopathy on "Chinese Thorowax Root–angelica" and its mechanism. The active compounds in "Chinese Thorowax Root–angelica" and their corresponding targets were analysed using the TCMSP database. In this paper, anti-inflammatory targets were obtained from GeneCards, OMIM and other databases, and the component network of the target pathway was constructed using Cytoscape software. On this basis, a new protein–protein interaction network model was established. In this paper, the concentrations of GO and KEGG were analysed using PPI analysis of intersection targets. The results showed that AKT1 was strongly associated with 15 active substances, 17 TNF, 11 TP53, 13 VEGFA, and 11 IL-6. It was found that the compatible active substance of Chinese Thorowax Root–angelica had a strong binding affinity with the main target. Drug-active substances and corresponding targets are relevant for the treatment of cyclomastopathy. [ABSTRACT FROM AUTHOR]

The initial precipitation affected the microstructures of the catalysts and further affected the morphology of carbon nanotubes. • The catalyst particles prepared by microreactor have better dispersibility. • The initial precipitation process affected the microstructure of the catalyst. • The preparation of catalyst could affect the diameter distribution and graphitization degree of CNTs. • Decreasing the reduction temperature properly could improve the catalytic activity. Catalysts are essential for the preparation of carbon nanotubes. In this work, Fe-Mo/Al 2 O 3 catalysts prepared by using microreactor with precise control and rapid mixing of microfluids. Here the catalysts were applied to the synthesis of CNTs and to the low temperature reduction. The catalysts and CNTs were characterized by SEM, TEM, H 2 -TPR and Raman. The results showed that efficient mixing of microreactor can strengthen the interaction between metal and support, improved the stability of catalysts, making that it was difficult to deactivate at high temperature. The catalysts prepared by microreactor had more active sites, which improved the catalytic performance, and had higher C 3 H 6 converstion. Compared with the catalysts prepared by traditional reactions, the surface morphology of the catalysts prepared by microreactor was folded and the active component had better dispersion. Except that, the microreactor strengthened the uniformity of precipitation components distribution during co-precipitation, enhanced the interaction between active components and carriers, and improved the mechanical strength of catalysts. After reduction, the specific surface area of the catalyst was significantly reduced and the particles further coalesced. Different reduction temperature (low temperature) can affect the catalytic activity and graphitization degree of CNTs. The catalytic activity of the catalyst calcined at 450°C and reduced at 600°C can reach 74.76%, and it exhibited better graphitization degree. [ABSTRACT FROM AUTHOR]

Catalytic pyrolysis of guaiacol as a model compound of lignin was conducted to explore the lignin pyrolysis mechanism in this study. The effects of catalyst and temperature on product distribution were studied. Five catalysts were tested including HZSM‐5, hierarchical HZSM‐5, metal‐modified hierarchical HZSM‐5 catalysts. And the Ni/La bimetallic hierarchical HZSM‐5 (NiLa/HZ‐SH) contributes to the achievement of high conversion and selectivity in catalytic pyrolysis of guaiacol. we obtained the yields of monocyclic aromatic hydrocarbons over NiLa/HZ‐SH (550°C): Phenol (23.01%), Benzofuran (6.68%), Salicylaldehyde (1.54%), 2‐Methylphenol (31.48%), 4‐Methylphenol (6.54%), 2‐Ethylphenol (14.89%), 4‐Vinylphenol (1.45%) and Catechol (8.67%), and the maximal yields of these monocyclic aromatic hydrocarbons is 94.26%. Moreover, the yield of polycyclic aromatic hydrocarbons (PAH) as the non‐target product reached a minimum of 1.46% over NiLa/HZ‐SH, while it was 16.88% without catalyst. In addition, catalyst stability was investigated, the reason that led to the decrease of target products could be the acidity and surface area of catalysts decreased as the coke blocked the pore channels, spent catalyst can be successfully regenerated through calcination treatment. Finally, based on the experiment results in this work and other published studies, a guaiacol pyrolysis mechanism was summarized and proposed aiming to understand the lignin pyrolysis process. [ABSTRACT FROM AUTHOR]

Malignant skin lesions pose a great threat to patients' health, and the use of computer algorithms for automatic skin medical image classification can effectively improve the efficiency of clinical diagnosis. However, the existing methods for skin classification have complex models and are greatly affected by the imbalance of the dataset. In this work, we propose a two‐stage framework called G‐DMN, it uses CycleGAN to expand the dataset and Dense‐MobileNetV2 (DMN) to achieve the automatic classification of skin lesion images. In the first stage, we use CycleGAN for data augmentation and propose a new image pairing strategy for training. Image pairs are formed from majority class images and minority class images, generators are trained for majority to minority class image conversion, and then minority class images are generated to balance the dataset. In the second stage, we propose a lightweight model called DMN by improving MobileNetV2, it enhances feature reuse by increasing the width of the network and allows the network to focus on focal areas from different scales. The original training set combined with the generated images is used to train DMN for skin lesion classification. We tested the proposed model on the HAM10000 dataset, and the G‐DMN achieved 87.07% classification accuracy, 80.13% precision, 75.28% sensitivity, 96.19% specificity, 77.26% F1‐Score and 0.952 AUC, which has a good classification effect, while the number of parameters of the model is only 5.33 M, which is much lower than other classical classification models. We demonstrate that the proposed method is lighter and more effective than classical classification methods, achieving significant performance improvements. [ABSTRACT FROM AUTHOR]

Electron-doped Sr2IrO4 is the best candidate for unconventional superconductivity, but direct evidence of superconductivity has not been experimentally confirmed. Therefore, it is urgent to explore the complex and rich physical properties caused by doping. The planar Hall effect (PHE) is a sensitive technique for the characterization of intrinsic magnetic properties in magnetic thin films and is applied widely in spintronic devices. In this work, the PHE for La-doped Sr2IrO4 films as a function of the magnetic field direction and temperature exhibited unique properties caused by electron doping. The amplitude of PHE is proportional to the strength of the applied magnetic field. Remarkably, as the temperature increased, a sign reversal of angle-dependent PHE occurred at 90 K, which indicated the change of magnetic anisotropy. Subsequent variable-temperature traditional Hall measurements and time-resolved optical studies eliminated different types of carrier interactions. The anisotropic magnetoresistance measurements indicated that the sign reversal can be attributed to the changes of a spin structure after electron doping, and the reversal temperature is related to the strength of ferromagnetism. These results provide a platform to study the magnetic interactions and suggest the possibility of realizing thermal controllable magnetic sensor devices in electron-doped Sr2IrO4 films. [ABSTRACT FROM AUTHOR]

Wrapping paper has an irreplaceable role in the food industry, but the high hydrophilicity of cellulose-based wrapping paper limits its application. Here, we aim to develop a fluorine-free and stable method for preparing the superhydrophobic cellulose-based paper using KH570-modified-n-TiO2 and ε-polylysine (ε-PL) to construct a superhydrophobic surface by layer-by-layer self-assembly. The paper modified by (ε-PL/KH570-modified-n-TiO2)4 multilayers has superhydrophobic and self-cleaning properties after heat treatment. The water contact angle reaches up to 152.8° and the antibacterial rate is close to 100%. The high barrier properties to water vapor better prolong the shelf life of cherries. Therefore, the (ε-PL/KH570-modified-n-TiO2)4 multilayers modified paper can provide a new idea for food preservation. The advantage of the double-layer assembly is that even if the superhydrophobic layer of the wrapper is worn away and lost, the remaining ε-PL is still able to act as a bacterial inhibitor, ensuring that the food is not perishable. [ABSTRACT FROM AUTHOR]

[Display omitted] • Multifunctional organohydrogels with double network structure. • Organohydrogels have excellent mechanical and electrical properties. • Excellent adhesion performance on different substrate surfaces. • Long-term environmental stability in different environments. • Organohydrogels are used for large and subtle motion monitoring. Sensitive strain sensors have attracted more attention due to their applications in health monitoring and human–computer interaction. However, the problems existing in conventional hydrogels, such as inherent brittleness, freezing at low temperature, low toughness, and water evaporation, have greatly hindered the practical applications. In order to solve the above problems, herein, we designed dual network multifunctionality organohydrogels using polyvinylpyrrolidone (PVP) and polyvinyl alcohol (PVA) covalent cross-linking polymer as the first network, the bacterial celluloses (BCs) and calcium chloride by ligand binding as the second network. The prepared organohydrogels showed good conductivity and sensitivity over a wide temperature range (-20 ∼ 40 ℃), and maintained long-term stability (>15 days) in the air. In addition, the dynamic combination of BCs-Ca2 + and hydrogen bonds in the binary system further endows the organohydrogels with excellent tensile strength (≈1.0 MPa), tensile strain (≈1300%), toughness (≈6.2 MJ m−3), conductivity (3.4 S m−1), gauge factor (≈1.24), adhesion (≈0.3 MPa), and self-healing properties (self-healing tensile strain to 632%). Therefore, this organohydrogel has potential candidates for flexible electronic skin, motion monitoring, and soft robotics. [ABSTRACT FROM AUTHOR]

In this work, a lignosulfonate has been used for synthesizing the graphene quantum dots (GQDs) with many functional groups by a two-step method. Then a graphene-based composite hydrogel (GH-GQD) was obtained through the modification of the functionalized GQDs. Results showed that the composite hydrogel had a highly porous structure and numerous active sites. Accordingly, the assembled GH-GQD electrode exhibited an impressive specific capacitance of 451.7 F g−1 at a current density of 0.5 A g−1, a good cycle stability (89.0% capacitance retention after 10000 charge/discharge cycles) and mechanical flexibility (93.3% capacitance retention bent to 180°). The present findings indicate a great potential of the graphene hydrogels modified with the functionalized GQDs in fabricating flexible supercapacitor electrodes. Image 104 Schematic illustration of the preparation of GH-GQD. • Lignosulfonates from waste liquor of sulfite pulping are used to synthesize GQDs. • The GH-GQD composites are modified by the functionalized GQDs. • The GH-GQD electrode has highly porous structures and effective active sites. • The highest specific capacitance of GH-GQD electrode is 451.7 F g−1 at 0.5 A g−1. • Good cycle stability and mechanical flexibility of GH-GQD electrode are obtained. [ABSTRACT FROM AUTHOR]

• Co-pyrolysis and co-liquefaction of lignite and cellulose was investigated. • Optimal liquid fuel yield of co-pyrolysis and co-liquefaction was confirmed. • The synergy of co-liquefaction was better than that of co-pyrolysis. • Inferred the reaction mechanism of co-utilization of lignite and cellulose. The synergistic effects of lignite and cellulose co-pyrolysis and co-liquefaction were investigated. The optimal liquid fuel yield of co-pyrolysis was 34.72% at a reaction temperature of 550 °C, with a holding time of 30 min, whereas that of co-liquefaction was 39.26% at a reaction temperature of 340 °C, with a holding time of 30 min, an ethanol content of 60% in sub-/supercritical ethanol-water, and a liquid–material ratio of 10:1 (ml/g). Liquid fuel obtained under the best conditions was performed using Fourier transform infrared (FTIR) spectroscopy and gas chromatograph-mass spectrometer (GC-MS). The results of liquid fuel characterization showed that a synergy in co-pyrolysis and co-liquefaction, and the synergy of co-liquefaction was better than that of co-pyrolysis. The reaction mechanism revealed that the presence of the electron-supplying groups generated from cellulose cracking and ethanol reduced the bond energy in the macromolecular structure of lignite and promoted the thermal conversion of lignite. [ABSTRACT FROM AUTHOR]

To investigate the application of the vermillion myocutaneous flap in restoration after lip cancer resection. From July 2012 to December 2019, six patients with lip cancer admitted in our department were included in this study. Total defect of the whole layer of the lip, accounted for 1/3 to 1/2 of the total length of the lip after tumor resection, were repaired by vermillion myocutaneous flap. For the case defect presenting >1/2 of the total length of the lip, a local rotational flap was designed with vermillion myocutaneous flap compound to repair the defect. At present, the patients were followed up for 6 months to 7 years. There was no tumor recurrence. The aesthetic effects and function of lip after operation were ideal, with satisfactory outcomes. Vermillion myocutaneous flap with the labial artery as the axis was an effective method to restore the anatomical structure and function of the lip. In the presence of a defect area of larger than 1/2 of the length of the whole lip, local skin flap can be used for simultaneous repair in order to achieve satisfactory outcome. [ABSTRACT FROM AUTHOR]

A strain gradient induced by mechanical bending on a SrTiO3 substrate is demonstrated, and has a pronounced influence on the carrier density and mobility of the interfacial 2D electron gas at the LaAlO3/SrTiO3 heterointerface. Tensile and compressive strain gradients represent two states of upward and downward bending. Under the tensile strain gradient, the carrier density decreases and the mobility has about 200% increase. Conversely, under the compressive strain gradient, the mobility decreases and the carrier density increases by up to 107%. These results demonstrate a range of opportunities to modulate the carrier density and mobility at oxide heterointerface and open up a promising way for further research on application of oxide devices. [ABSTRACT FROM AUTHOR]

Nowadays, supercapacitors based on cellulose nanofibril (CNF) films have attracted extensive interest due to their excellent flexibility, light weight, and unique structure. Herein, we report that highly conductive films are prepared through polypyrrole (PPy) coating on CNF films by a simple and low-cost "soak and polymerization" method. The optimized flexible film features a high electrical conductivity of 23.77 S cm−1, a superior tensile strength of 71.4 MPa, outstanding conductance stability, and a good thermal stability. Additionally, the hybrid film as a freestanding and binder-free supercapacitor electrode can provide a high areal capacitance (2.26 F cm−2 at 2 mA cm−2) and good cyclic stability (a capacitance retention of 70.5% after 5000 cycles). Remarkably, an all-solid-state flexible supercapacitor assembled by two pieces of the optimized PPy-coated CNF (PPy/CNF) film electrodes delivers an excellent areal capacitance of 1.39 F cm−2 at 0.1 mA cm−2, revealing an ultrahigh energy density of 16.95 mWh cm−3 at a power density of 1.2 mW cm−3. [ABSTRACT FROM AUTHOR]

[Display omitted] • A synthesis method for the GO-COOH. • The carboxyl group high ratio of GO-COOH based on DES. • This method more green than conventional method. • GO-COOH/CNF adsorbent had high adsorption for MB. • The potential for environmentally friendly cellulose-based adsorbent for dye wastewater. An efficient adsorbent for eliminating methylene blue (MB) from water solutions was created by combining carboxyl-functionalized graphene oxide (GO-COOH) with cellulose nanofiber. The GO-COOH was prepared using a malonic acid-choline chloride deep eutectic solvent, resulting in a carboxyl group ratio of 5.3 % and a C/O ratio of 2.15. This novel approach addresses the issue of partial reduction of GO-COOH observed in traditional preparation methods, thereby enhancing the adsorption capacity of the adsorbent for MB (611.44 mg g−1). In general, this method provides the opportunity for producing cellulose-based adsorbents for dye wastewater on a large scale, while being environmentally friendly. [ABSTRACT FROM AUTHOR]

Modulation of Kondo phenomenon in two-dimensional materials is of great significance. Unfortunately, the strain effect, one of the effective regulation methods, is usually lacking in previously studied Kondo systems. Here we show that a tensile or compressive strain gradient induced by a three-point bending apparatus has a prominent impact on Kondo effect of the two dimensional electron gas at the LaAlO 3 /SrTiO 3 heterointerface. Under the tensile strain gradient, Kondo temperature (T K) decreases. In contrast, T K increases under the compressive strain gradient. At the same time, the temperature at which the resistance has a minimum, T min , shows the same strain gradient dependence as T K. The present study may pave the way for manipulating many-body effects at oxide heterointerface. • A tensile or compressive strain gradient induced by a three-point bending apparatus has a prominent impact on Kondo effect of the two dimensional electron gas at the LaAlO 3 /SrTiO 3 heterointerface. • Under the tensile strain gradient, Kondo temperature (T K) decreases. In contrast, Kondo temperature increases under the compressive strain gradient.The present study may pave the way for manipulating many-body effects at oxide heterointerface. [ABSTRACT FROM AUTHOR]