Free radicals trigger the closure of open pores in lignin-derived hard carbons toward improved sodium-storage capacity

The chemical activation of various precursors is effective for creating additional closed pores in hard carbons for sodium storage.However,the formation mechanism of closed pores under the influence of pore-forming agents is not well understood.Herein,an effective chemical activation followed by a high-temperature self-healing strategy is employed to generate interconnected closed pores in lignin-derived hard carbon(HCs).By systematic experimental design combined with electron paramagnetic res-onance spectroscopy,it can be found that the content of free radicals in the carbon matrix influences the closure of open pores at high temperatures.Excessively high activation temperature(>700 C)leads to a low free radical concentration,making it difficult to achieve self-healing of open pores at high tempera-tures.By activation at 700°C,a balance between pore making and self-healing is achieved in the final hard carbon.A large number of free radicals triggers rapid growth and aggregation of carbon microcrys-tals,blocking pre-formed open micropores and creating additional interconnected closed pores in as-obtained hard carbons.As a result,the optimized carbon anode(LK-700-1300)delivers a high reversible capacity of 330.8 mA h g^(-1) at 0.03 A g^(-1),which is an increase of 86 mA h g^(-1) compared to the pristine lignin-derived carbon anode(L-700-1300),and exhibits a good rate performance(202.1 mA h g^(-1) at 1 A g^(-1)).This work provides a universal and effective guidance for tuning closed pores of hard carbons from otherprecursors.

基于六水铝酸三钙的双电层调控从铝酸钠溶液中短流程脱除有机物

从铝酸钠溶液中经济地脱除有机物是长期以来的研究重点。基于叶滤环节将六水铝酸三钙(TCA)作为助滤剂的工艺,提出一种短流程同时滤除杂质颗粒和吸附脱除有机物的新方法。在浓缩铝酸钠溶液中制备结晶度低、TCA含量高、表面能高、晶格畸变大的超细TCA样品。同时,TCA样品在碱性溶液中的Zeta电位线性依赖于TCA含量,揭示二元混合物Zeta电位的可加性。描述在碱性溶液中TCA二元混合物双电层的演化规律。此外,超细TCA样品对长烷基链及高相对分子质量有机物具有较高的吸附容量,对腐殖酸钠的吸附容量可达69.69mg/g(以有机碳计),而高温溶出过程会显著降低TCA的吸附容量。

Angular and planar transport properties of antiferromagnetic V_(5)S_(8)

Systemically angular and planar transport investigations are performed in layered antiferromagnetic(AF)V_(5)S_(8).In this AF system,obvious anomalous Hall effect(AHE)is observed with a large Hall angle of 0.1 compared to that in ferromagnetic(FM)system.It can persist to the temperatures above AF transition and exhibit strong angular field dependence.The phase diagram reveals various magnetic states by rotating the applied field.By analyzing the anisotropic transport behavior,magnon contributions are revealed and exhibit obvious angular dependence with a spin-flop vanishing line.The observed prominent planar Hall effect and anisotropic magnetoresisitivity exhibit two-fold systematical angular dependent oscillations.These behaviors are attributed to the scattering from spin–orbital coupling instead of nontrivial topological origin.Our results reveal anisotropic interactions of magnetism and electron in V5S8,suggesting potential opportunities for the AF spintronic sensor and devices.

Reaction behavior of kaolinite with ferric oxide during reduction roasting

The pre-separation of silica and alumina in aluminosilicates is of great significance for efficiently treating alumina-/ silica-bearing minerals for alumina production. In this work, the reaction behavior of kaolinite with ferric oxide during reduction roasting was investigated. The results of thermodynamic analyses and reduction roasting experiments show that ferrous oxide obtained from ferric oxide reduction preferentially reacts with alumina in kaolinite to form hercynite, meanwhile the silica in kaolinite is transformed into quartz solid solution and/or cristobalite solid solution. With increasing roasting temperature, fayalite formed by reaction of surplus ferrous oxide with silica at low temperature is reduced to silica and metallic iron in the presence of sufficient carbon dosage. However, increasing roasting temperature and decreasing Fe2O3/Al2O3 molar ratio favor mullite formation. The complete conversion of kaolinte into free silica and hercynite can be obtained by roasting raw meal of kaolin, ferric oxide and coal powder with Fe2O3/Al2O3/C molar ratio of 1.2:2.0:1.2 at 1373 K for 60 min. This work may facilitate the development of a technique for comprehensively utilizing silica and alumina in aluminosilicates.

Efficient separation of alumina and silica in reduction-roasted kaolin by alkali leaching

Alkali leaching was employed to investigate the separation of alumina and silica in roasted kaolin obtained by roasting kaolin alone in air at 1273 K for 60 min and in clinker prepared by roasting the mixed raw meal of kaolin,ferric oxide and coal powder with Fe2O3/Al2O3/C molar ratio of 1.2:2.0:1.2 in reducing atmosphere at 1373 K for 60 min.The thermodynamic analyses and alkali leaching results show that the composition of the Al-Si spinel in roasted kaolin is close to that of 3Al2O3·2SiO2 and the spinel is dissolved with increasing leaching time,resulting in difficulty in deeply separating alumina and silica in kaolin by the traditional roasting-leaching process.On the contrary,the efficient separation of alumina and silica in kaolin can be reached by fully converting kaolinite into insoluble hercynite and soluble free silica,namely quartz solid solution and cristobalite solid solution,during reduction roasting,followed by alkali leaching of the obtained clinker.Furthermore,experimental results from treating high-silica diasporic bauxite indicate that the reduction roasting-alkali leaching process is potential to separate silica and alumina in aluminosilicates.

Transformation of hematite in diasporic bauxite during reductive Bayer digestion and recovery of iron

The reductive Bayer digestion by using iron powder as reductant is proposed to convert hematite to magnetite and further to dissociate iron minerals from sodium aluminosilicate hydrate(desilication product,DSP)based on the differences of their surface properties.The results show that the differences of surface properties between magnetite and DSP in zeta potential,wettability and solvation trend facilitate magnetite to agglomerate,grow up and thus to dissociate from DSP.The increments of reductant amount and alkali concentration favor the transformation of hematite in digestion with the relative alumina recovery of98.91%.Processing the resultant red mud can obtain qualified iron concentrate with iron grade of approximate60%and recovery of about86%through magnetic separation,resulting in reduction of red mud emission higher than70%.The results are potential to develop a novel technology for processing high iron diasporic bauxite efficiently and provide references for comprehensive utilization of high iron red mud.

Enrichment and separation of iron minerals in gibbsitic bauxite residue based on reductive Bayer digestion

The mineralogical characteristics of three kinds of gibbsitic high-iron bauxite and the effects of various digestion conditions on the enrichment and separation of iron minerals were investigated. The results show that adding an appropriate organic reductant such as glycerol can promote the digestion of concomitant diaspore, boehmite and alumogoethite as well as the conversion of goethite to hematite in the reductive Bayer digestion. Processing Bauxite A with A/S of 25.41 can directly produce qualified iron concentrates(TFe>56%) by the reductive Bayer digestion, and thus realize the zero red mud discharge. For Bauxite B and Bauxite C with A/S of 7.82 and 3.35, the iron recoveries of 65.13% and 79.13% can be achieved with the corresponding TFe of 52.05% and 50.16% in the iron concentrates by gravity separation, respectively, resulting in the red mud discharge reduction of ~50% or above.

Effect of solution treatment time on plasticity and ductile fracture of 7075 aluminum alloy sheet in hot stamping process

The effect of solution treatment time on the post-formed plasticity and ductile fracture of 7075 aluminum alloy in the hot stamping process was studied.Tensile tests were conducted on the specimens subjected to the hot stamping process with different solution treatment time.The digital image correlation(DIC)analysis was used to obtain the strain of the specimen.Based on the experiments and modeling,the Yld2000-3d yield criterion and the DF2014 ductile fracture criterion were calibrated and used to characterize the anisotropy and fracture behavior of the metal,respectively.Furthermore,the microstructure of specimens was studied.The experimental and simulation results indicate that the 7075 aluminum alloy retains distinct anisotropy after the hot stamping process,and there is no obvious effect of extending the solution treatment time on the material anisotropy.However,it is found that a longer solution treatment time can increase the fracture strain of the aluminum alloy during the hot stamping process,which may be related to the decrease of the second-phase particles size.

Proinflammatory effects and molecular mechanisms of interleukin-17 in intestinal epithelial cell line HT-29

AIM:To evaluate the proinflammatory effects and molecular mechanisms of interleukin(IL)-17 in intestinal epithelial cell line HT-29.METHODS:HT-29 cells were cultured with IL-17,tumor necrosis factor(TNF)-α,or the combination of both IL-17 and TNF-α.Real-time PCR and Western blot were used to measure the gene expression levels of neutrophil chemokines CXCL1,CXCL2,CXCL5,CXCL6,IL-8and TH-17 cell chemokine CCL20,the phosphorylation levels of p38 and TNF-α,and the expression level of IL-8,after using the p38 inhibitor in HT-29 cells.The stable Act1 knockdown HT-29 cell line was established to further test the phosphorylation changes of p38,after using IL-17 and TNF-α.RESULTS:After HT-29 cells were cultured with IL-17and TNF-α,the expression levels of neutrophil chemokines(CXCL1,CXCL2,CXCL5,CXCL6,IL-8)and Th17chemokine(CCL20)significantly improved(24.96±2.53,28.47±2.87,38.08±2.72,33.47±2.41,31.7±2.38,44.37±2.73,respectively),and the differences were all statistically significant(P<0.01).Western blot results showed that IL-17 obviously enhanced the phosphorylation level of p38,which was induced by TNF-α.Compared with the control group,the expression level of IL-8 significantly declined(9.47±1.36 vs 3.06±0.67,P<0.01)when TH-29 cells were cultured with IL-17and TNF-α.p38 inhibition assay showed that the p38pathway played an essential role in the inflammatory response induced by IL-17.p38 phosphorylation levels could not be changed after using IL-17 and TNF-αin the stable Act1 knockdown HT-29 cell line.CONCLUSION:IL-17 significantly promoted the gene expression levels of TNF-α-induced neutrophil chemokines and Th17 cell chemokine.It is obvious that IL-17and TNF-αhave synergistic effects on p38.

Mitochonic acid 5 regulates mitofusin 2 to protect microglia

Microglial apoptosis is associated with neuroinflammation and no effective strategies are currently available to protect microglia against inflammation-induced apoptosis. Mouse microglial BV-2 cells(5 × 10^6) were incubated with 10 μg/mL lipopolysaccharides for 12 hours to mimic an inflammatory environment. Then the cells were co-cultured with mitochonic acid 5(MA-5) for another 12 hours. MA-5 improved the survival of lipopolysaccharide-exposed cells. MA-5 decreased the activity of caspase-3, which is associated with apoptosis. MA-5 reduced the number of terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling-positive cells, and increased adenosine triphosphate levels in cells. MA-5 decreased the open state of the mitochondrial permeability transition pore and reduced calcium overload and diffusion of second mitochondria-derived activator of caspase(Smac). MA-5 decreased the expression of apoptosis-related proteins(mitochondrial Smac, cytoplasmic Smac, pro-caspase-3, cleaved-caspase-3, and caspase-9), and increased the levels of anti-apoptotic proteins(Bcl2 and X-linked inhibitor of apoptosis protein), mitochondria-related proteins(mitochondrial fusion protein 2, mitochondrial microtubule-associated proteins 1 A/1 B light chain 3 B II), and autophagy-related proteins(Beclin1, p62 and autophagy related 5). However, MA-5 did not promote mitochondrial homeostasis or decrease microglial apoptosis when Mitofusin 2 expression was silenced. This shows that MA-5 increased Mitofusin 2-related mitophagy, reversed cellular energy production and maintained energy metabolism in BV-2 cells in response to lipopolysaccharide-induced inflammation. These findings indicate that MA-5 may promote the survival of microglial cells via Mitofusin 2-related mitophagy in response to lipopolysaccharide-induced inflammation.

Refractive Plasmonic Sensor Based on Fano Resonances in an Optical System

A symmetric plasmonie structure consisting of metal-insulator metal waveguide, groove studied, which supports double Fano resonances deriving from two different mechanisms and slot cavities is One of the Fano resonances originates from the interference between the resonances of groove and slot cavities, and the other comes from the interference between slot cavities. The spectral line shapes and the peaks of the double Fano resonances can be modulated by changing the length of the slot cavities and the height of the groove. Furthermore, the wavelength of the resonance peak has a linear relationship with the length of the slot cavities. The proposed plasmonic nanosensor possesses a sensitivity of 800nm/RIU and a figure of merit of 3150, which may have important applications in switches, sensors, and nonlinear devices.

Effect of Psychological Education Combined with Progressive Muscle Relaxation Training on the Symptom Cluster and Rehospitalization Rate of Elderly Patients with Coronary Heart Disease

Objective:To investigate the effect of psychological education combined with progressive muscle relaxation training on the symptom cluster and rehospitalization of elderly patients with coronary heart disease.Methods:This study is a longitudinal randomized controlled study involving 140 elderly patients with coronary heart disease.The patients were divided into two groups:an intervention group and a control group,with 70 cases in each group,via random number table.The patients in the control group received routine nursing,whereas those in the intervention group received psychological education combined with progressive muscle relaxation training for 4 weeks on the basis of routine nursing.The effect of the intervention was evaluated before intervention,at the end of 1 month,3 months,and 6 months after intervention.Results:At the end of 1 month,3 months,and 6 months,the sleep,fatigue,anxiety,and functional status of the patients in the intervention group were significantly better than those of the control group,with statistical significance difference(P<0.05).The rehospitalization rate of the intervention group was lower than that of the control group,and the difference was statistically significant(X2=10.685,P=0.001).Conclusion:Psychological education combined with progressive muscle relaxation training is effective in alleviating the symptom cluster of elderly patients with coronary heart disease and reducing their rehospitalization rate;thus,it should be popularized.

Relationship between the Self-Efficacy and Mental Health of Elderly Patients with Coronary Heart Disease in Rural Hebei Province

Objective:To investigate the self-efficacy and mental health of elderly patients with coronary heart disease(CHD)in rural Hebei Province as well as to analyze the relationship between them.Methods:From June 2021 to December 2021,480 elderly patients with CHD from rural areas,who had been discharged by the Department of Cardiology from three tertiary hospitals in three cities with different economic levels in Hebei Province for more than a year,were selected as the research subjects.The general self-efficacy scale(GSES)and symptom self-rating scale(SCL-90)were used to investigate the self-efficacy and mental health of these patients.SPSS 25.0 was used for data analysis.Results:The total mean self-efficacy score of elderly patients with CHD in rural Hebei Province was 17.18±4.68,which is lower than the international norm(t=-32.067,P=0.000)and the national norm(t=-28.783,P=0.000);the total average SCL-90 score was 148.64±55.13,which is higher than the national norm for adults and the reference norm for ordinary elderly people;except for hostility and psychosis,the other dimensions were significantly higher than the national norm for adults(P<0.05);except for psychosis,the other dimensions were significantly higher than the reference norm for ordinary elderly people(P<0.05);the self-efficacy score was found to be negatively correlated with the total SCL-90 score and the score for each dimension(P<0.05).Conclusion:Elderly CHD patients with higher self-efficacy in rural Hebei Province have higher mental health level.It is suggested that the mental health of elderly patients with CHD in rural areas can be improved by improving their self-efficacy.

A Readmission Risk Prediction Model for Elderly Patients with Coronary Heart Disease

Objective:To analyze the independent risk factors and establish a risk prediction model by investigating the readmission of elderly patients with coronary heart disease(CHD)within 1 year after discharge.Methods:A total of 480 CHD patients,who were hospitalized in the Affiliated Hospital of Hebei University from October 2019 to December 2020,were included in this study.A general data scale,mental health status scale,the Clinical Frailty Scale,Pittsburgh Sleep Quality Index,as well as the Family Adaptability and Cohesion Evaluation Scale were used to collect data.According to the number of readmissions due to CHD within 1 year after discharge,the patients were divided into two groups:the readmission group(n=212)and the no readmission group(n=268).General data,laboratory examination indicators,frailty,mental health status,sleep status,as well as family intimacy and adaptability were compared between the two groups.Logistic regression was used to analyze the independent risk factors for the readmission of these patients,and R software was used to construct a line diagram model for predicting readmission of elderly patients with CHD.Results:Five factors including body mass index(OR=1.045),low density lipoprotein(OR=1.123),frailty(OR=1.946),mental health(OR=1.099),as well as family intimacy and adaptability(OR=0.928)were included to construct the risk prediction model for the readmission of elderly patients with CHD within 1 year after discharge.The ROC curve showed that the area under the curve for predicting readmission of elderly patients with CHD was 0.816;Hosmer-Lemeshow goodness of fit test showed X2=1.456 and P=0.989;the maximum Youden index corresponding to the predicted value of risk was 0.526.The results showed that the model could accurately predict the risk of readmission in elderly patients with CHD within 1 year after discharge.Conclusion:This study constructed a line diagram model based on five independent risk factors of the readmission of elderly patients with CHD:body mass index,low density lipoprotein,frailty,mental health status,as well as family intimacy and adaptability.This model has good discrimination,accuracy,and predictive efficiency,providing reference for the early prevention and intervention of readmission in elderly patients with CHD recurrence.

Enhanced conversion mechanism of Al-goethite in gibbsitic bauxite under reductive Bayer digestion process

The conversion mechanism of Al-goethite under the action of different additives(lime or reductant for typical or reductive Bayer digestion)was investigated by thermodynamic calculation,XRD,and SEM-EDS.The results show that the formation of Fe-substituted hydrocalumite is crucial to converting Al-goethite to hematite during Bayer digestion by adding lime.However,the conversion proceeds more easily under the action of reductant due to the rapid formation of magnetite.Additionally,Bayer liquor composition significantly affects the product composition and also the conversion rate of Al-goethite.Compared to typical Bayer digestion with Al-goethite containing gibbsitic bauxite as raw material,the red mud yield of reductive Bayer digestion decreases from 39.02%to 31.19%,and the grade of TFe in red mud increases from 41.66%to 53.80%.

Strong Exciton-Plasmon Coupling and Hybridization of Organic-Inorganic Exciton-Polaritons in Plasmonic Nanocavity

We investigate strong exciton-plasmon coupling and plasmon-mediated hybridization between the Frenkel(F)and Wannier–Mott(WM)excitons of an organic-inorganic hybrid system consisting of a silver ring separated from a monolayer WS2 by J-aggregates.The extinction spectra of the hybrid system calculated by employing the coupled oscillator model are consistent with the results simulated by the finite-difference time-domain method.The calculation results show that strong couplings among F excitons,WM excitons,and localized surface plasmon resonances(LSPRs)lead to the appearance of three plexciton branches in the extinction spectra.The weighting efficiencies of the F exciton,WM exciton and LSPR modes in three plexciton branches are used to analyze the exciton-polaritons in the system.Furthermore,the strong coupling between two different excitons and LSPRs is manipulated by tuning F or WM exciton resonances.

Ataxia-telangiectasia complicated with Hodgkin's lymphoma:A case report

BACKGROUND Ataxia-telangiectasia(AT)is a rare,autosomal recessive,multisystem disorder.Because most clinicians have low awareness of the disease,only scarce reports of AT exist in the literature,especially of cases with lymphoma/leukemia.CASE SUMMARY A 7-year-old girl with a history of recurrent respiratory tract infections was referred to our department because of unstable walking for 5 years and enlarged neck nodes for 2-mo duration.Physical examination revealed scleral telangiectasia and cerebellar ataxia.Elevated alpha-fetoprotein,decreased serum immunoglobulin,and decreased T cell function were the major findings of laboratory examination.Histological analysis of cervical lymph node biopsy was suggestive of classical Hodgkin's lymphoma.Genetic examination showed heterozygous nucleotide variation of c.6679C>T and heterozygous nucleotide variation of c.5773 delG in the ATM gene;her parents were heterozygotes.The final diagnosis was AT with Hodgkin's lymphoma.CONCLUSION Clinicians should strengthen their understanding of AT diseases.Gene diagnosis plays an important role in its diagnosis and treatment.

Transparent micropatterned conductive films based on highlyordered nanowire network

Transparent conductive films that are based on nanowire networks are essential to construct flexible,wearable,and even stretchable electronics.However,large-scale precise micropatterning,especially with regard to the controllability of the organizing orientation of nanowires,is a critical challenge.Herein,we proposed a liquid film rupture self-assembly approach for manufacturing transparent conductive films with microstructure arrays based on a highly ordered nanowire network.The large-scale microstructure conductive films were fabricated through air-liquid interface self-assembly and liquid film rupture self-assembly.Six typical micropattern morphologies,including square,hexagon,circle,serpentine,etc.,were prepared to reveal the universal applicability of the proposed approach.The homogeneity and controllability of this approach were verified for multiple assemblies.With the assembly cycles increasing,the optical transmittance decreases slightly.In addition,theoretical model analysis is carried out,and the analytical formula of the speed of the film moving with the surface tension and the density of the liquid film is presented.Finally,the feasibility of this approach for piezoresistive strain sensors is verified.This fabrication approach demonstrated a cost-effective and efficient method for precisely arranging nanowires,which is useful in transparent and wearable applications.

Stretchable multifunctional sensor based on porous silver nanowire/silicone rubber conductive film

As one of the promising human–machine interfaces,wearable sensors play an important role in modern society,which advances the development of wearable fields,especially in the promising applications of electronic skin(e-skin),robotics,prosthetics,healthcare.In the last decades,wearable sensors tend to be capable of attractive capabilities such as miniaturization,multifunction,smart integration,wearable properties such as lightweight,flexibility,stretchability,conformability for wider applications.In this work,we developed a stretchable multifunctional sensor based on porous silver nanowire/silicone rubber conductive film(P-AgNW/SR).Its unique structural configuration,i.e.,an assembly of the P-AgNW/SR with good conductivity,stability,resistance response,the insulated silicone rubber layer,provided the feasibility for realizing multiple sensing capabilities.Specifically,porous microstructures of the P-AgNW/SR made the device to be used for pressure sensing,exhibiting outstanding dynamic and static resistive responsive behaviors and having a maximum sensitivity of 9.062%∙N^(−1) in a continuous compressive force range of~16 N.With the merit of the good piezoresistive property of AgNW/SR networks embedded into the surface of micropores of the P-AgNW/SR,the device was verified to be a temperature sensor for detecting temperature changes in the human body and environment.The temperature sensor had good sensitivity of 0.844%∙℃^(−1),high linearity of 0.999 in the range of 25–125℃,remarkable dynamic stability.Besides,the developed sensor was demonstrated to be a single electrode-triboelectric sensor for active sensing,owing to the unique assembly of the conductive PAgNW/SR electrode and the silicone rubber friction layer.Based on the coupling effect of the triboelectrification and electrostatic induction,the generated electrical signals could be used to sense the human motions,according to the quantitative correlation between the human motions and the features in amplitude and waveform of the output signals.Thus,the developed stretchable sensor successfully achieved the integration of two types of passive sensing capabilities,i.e.,pressure and temperature sensing,and one type of active sensing capability,i.e.,triboelectric sensing,demonstrating the feasibility of monitoring multiple variables of the human body and environment.

High-performance hybrid nanogenerator for selfpowered wireless multi-sensing microsystems

Wireless sensor network nodes are widely used in wearable devices,consumer electronics,and industrial electronics and are a crucial component of the Internet of Things(IoT).Recently,advanced power technology with sustainable energy supply and pollution-free characteristics has become a popular research focus.Herein,to realize an unattended and reliable power supply unit suitable for distributed IoT systems,we develop a high-performance triboelectricelectromagnetic hybrid nanogenerator(TEHNG)to harvest mechanical energy.The TEHNG achieves a high load power of 21.8 mW by implementing improvements of material optimization,configuration optimization and pyramid microstructure design.To realize a self-powered integrated microsystem,a power management module,energy storage module,sensing signal processing module,and microcontroller unit are integrated into the TEHNG.Furthermore,an all-in-one wireless multisensing microsystem comprising the TEHNG,the abovementioned integrated functional circuit and three sensors(temperature,pressure,and ultraviolet)is built.The milliwatt microsystem operates continuously with the TEHNG as the only power supply,achieving self-powered operations of sensing environmental variables and transmitting wireless data to a terminal in real time.This shows tremendous application potential in the IoT field.