Research Progress of Solid Hydrogen Storage Materials for Hydrogen Energy Storage and Transportation

With the rapid development of hydrogen energy, hydrogen storage alloys have attracted wide attention owing to their key advantages, such as high volume density, proper plateau pressure, environmental friendliness and good safety. In the present review, the research progress of the improvement in hydrogen storage alloys, including rare-earth-based alloys, Mg-based alloys, Ti/Zr-based alloys, V-based alloys and high entropy alloys are systematically summarized. The influences of elemental substitution, catalyst doping, preparation methods and nanotechnology on the crystal structure, hydrogen storage properties as well as their affecting mechanisms, are discussed. Furthermore, the development trend and future research directions are proposed, which are expected to bring novel research ideas and potentially applicable methods for the development of high-performance hydrogen storage alloys.

Research on Three-Dimensional Simulation of the Internal Arc Gear Skiving

Aiming at the problems that the simulation accuracy which is reduced due to the simplification of the model,a three-dimensional simulation method based on solid modeling is being proposed.By analyzing the motion relationship and positional relationship between the caries knife and the workpiece,the coordinate system of the caries machining was established.With the MATLAB software,the cutting edge model and the blade sweeping surface model of the boring cutter are sequentially established.Boolean operation is performed on the blade swept surface formed by the tooth cutter teeth with time t and the workpiece tooth geometry as well as the undeformed three-dimensional chip geometry model and the instantaneous cogging geometry model are obtained at different times.Through the compare between gear end face simulation tooth profile and the theoretical inner arc tooth profile,we verified the accuracy and rationality of the proposed method.

Experimental results for the vapor-liquid equilibria of 0(formaldehyde+1,3,5-trioxane+methanol+salt+water)systems and comparison with predictions

The salt effect on the vaporliquid phase equilibrium(VLE)of solvent mixtures is of significant interest in the industrial production of 1,3,5trioxane.Experimental data for the VLE of quinary systems(formaldehyde+1,3,5trioxane+methanol+salt+water)and their ternary subsystems(formaldehyde+salt+water),(1,3,5trioxane+salt+water),and(methanol+salt+water)were systematic measured under atmospheric pressure.The salts considered included KBr,NaNO_(3),and CaCl_(2).The extended UNIFAC model was used to describe the VLE of the saltcontaining reactive mixtures.The model parameters were determined from the experimental VLE data of ternary systems or obtained from the literature,and then were used to predict the VLE of systems(1,3,5trioxane+KBr+water),(methanol+KBr+water),(formaldehyde+KBr+water),and(formaldehyde+1,3,5trioxane+methanol+salt+water)with salt=KBr,NaNO_(3),and CaCl_(2).The predicted results showed good agreements with the measured results.Furthermore,the model was used to uncover the salt effect on the VLE of these multisolvent reactive systems.

Enhancement of thermoelectric properties of SrTiO3/LaNb–SrTiO3 composite by different doping levels

Strontium titanate（STO）is an n-type oxide thermoelectric material,which has shown great prospects in recent years.The doping of La and Nb into STO can improve its power factor,whereas its thermal conductivity is still very high.Thus,in order to obtain a high thermoelectric figure-of-merit z T,it is very important to reduce its thermal conductivity.In this paper,using a combination of a hydrothermal method and a high-efficiency sintering method,we succeed in preparing a composite of pure STO and La Nb-doped STO,which simultaneously realizes lower thermal conductivity and higherSeebeck coefficient,therefore,the thermoelectric properties of STO are significantly improved.In the SrTiO3/La Nb–SrTiO3 bulk samples,the lowest thermal conductivity is 2.57 W·m^-1·K^-1 and the highest z T is 0.35 at 1000 K for the STO/La（10）Nb（20）–STO sample.

Research on Sharing Economic Development of“Big Data+Block Chain”——Based on Industry Convergence Theory

Sharing economy as an important product of the Internet Era,its essence is to rely on Internet technology,especially big data technology to reuse the idle resources of society and creating new market value.However,with the increasing scope of the sharing economy,the problems of data security,circulation,sharing and privacy protection are gradually emerging,and big data technology has become the biggest bottleneck for further development of shared economy.The block chain technology is composed of a variety of technology and communication protocol to form a new Internet architecture,it through cryptographic sharing,distributed books and other feathers to provide new methods and ideas for data distribution and sharing and complementary with big data technology.Therefore,through the combination of block chain technology and big data technology,they can subvert the traditional shared economic business model and provide a new opportunity for sharing economic development.

Application of improved Beck oral score in oral care of burn patients with mechanical ventilation

Objective:To explore the application effect of improved Beck oral score in oral care of burn patients with mechanical ventilation,to provide practical basis for oral care of such patients.Methods:A total of 42 patients with tracheotomy and mechanical ventilation in the Department of Burn Surgery of Baogang Hospital in Inner Mongolia from January 2021 to December 2022 were selected as the study objects,and the patients were randomly divided into observation group and control group,with 21 cases in each group.The control group was given routine oral care,and the observation group was given oral care according to improved Beck oral score.The following were compared between the two groups:Age,total burn area,third-degree burn area,acute physiological and chronic health assessment scores,as well as improved Beck oral scores;the incidence of oral odor,plaque index,mouth ulcer and ventilator-associated pneumonia(VAP)after 7 days;the detection of microorganism in oral secretions.Results:After 7 days,the oral condition of patients in observation group was effectively improved,and the oral comfort level was significantly improved.The incidence of oral odor(2.57±1.59),dental plaque index(2.62±1.47),oral ulcer evaluation(2.24±1.09),VAP incidence(9.52%)and improved Beck oral score(8.09±1.92)in observation group were all lower than those in control group,which was(3.95±1.82),(3.57±1.21),(3.14±1.24),(38.09%),and(9.90±2.21)respectively.The difference was statistically significant(p<.05).The oral normalflora in observation group(71.43%)was higher than that in control group(28.57%),and the difference was statistically significant(p<.05).The oral gram-positive bacteria(19.05%)and Gram-negative bacteria(23.81%)in observation group were lower than those in control group,which was 52.38%and 57.14%respectively,and the difference was statistically significant(p<.05).Conclusions:The application of the improved Beck oral assessment method in dynamic oral care can effectively reduce the content of oral pathogens,lower the incidence of pulmonary infection,and improve the quality of life of patients.

A Novel 6G Scalable Blockchain Clustering-Based Computer Vision Character Detection for Mobile Images

6G is envisioned as the next generation of wireless communication technology,promising unprecedented data speeds,ultra-low Latency,and ubiquitous Connectivity.In tandem with these advancements,blockchain technology is leveraged to enhance computer vision applications’security,trustworthiness,and transparency.With the widespread use of mobile devices equipped with cameras,the ability to capture and recognize Chinese characters in natural scenes has become increasingly important.Blockchain can facilitate privacy-preserving mechanisms in applications where privacy is paramount,such as facial recognition or personal healthcare monitoring.Users can control their visual data and grant or revoke access as needed.Recognizing Chinese characters from images can provide convenience in various aspects of people’s lives.However,traditional Chinese character text recognition methods often need higher accuracy,leading to recognition failures or incorrect character identification.In contrast,computer vision technologies have significantly improved image recognition accuracy.This paper proposed a Secure end-to-end recognition system(SE2ERS)for Chinese characters in natural scenes based on convolutional neural networks(CNN)using 6G technology.The proposed SE2ERS model uses the Weighted Hyperbolic Curve Cryptograph(WHCC)of the secure data transmission in the 6G network with the blockchain model.The data transmission within the computer vision system,with a 6G gradient directional histogram(GDH),is employed for character estimation.With the deployment of WHCC and GDH in the constructed SE2ERS model,secure communication is achieved for the data transmission with the 6G network.The proposed SE2ERS compares the performance of traditional Chinese text recognition methods and data transmission environment with 6G communication.Experimental results demonstrate that SE2ERS achieves an average recognition accuracy of 88%for simple Chinese characters,compared to 81.2%with traditional methods.For complex Chinese characters,the average recognition accuracy improves to 84.4%with our system,compared to 72.8%with traditional methods.Additionally,deploying the WHCC model improves data security with the increased data encryption rate complexity of∼12&higher than the traditional techniques.

Performance of the Multilayer Film for Infrared Stealth based on VO_(2) Thermochromism

With the development of detection and identification technology,infrared stealth is of great value to realize anti-reconnaissance detection of military targets.At present,infrared stealth materials generally have deficiency,such as complex structure,inconvenient radiation regulation and cumbersome preparation steps,which greatly limit the practical application of infrared stealth materials.In view of the above deficiency of infrared stealth materials,we proposed a kind of multilayer film for infrared stealth using VO2thermochromism based on the temperature response mechanism of tuna to adjust its color,and through the intelligent reversible radiation regulation mechanism to meet the infrared stealth requirements of tanks in different actual scenes.The results show that when the temperature increases from 300 K to 373 K,the peak emissivity of the film decreases from 94%to 20%in the 8-14μm band after structural optimization,which can realize the infrared stealth of the high temperature target in the 8-14μm band.The average emissivity of the multilayer film for infrared stealth at3-5μm and 8-14μm band can be reduced to 34%and 27%at 373 K,and the peak emissivity at 5-8μm band can reach 65%,realizing dual-band infrared stealth in the 3-5μm and 8-14μm bands and heat dissipation in the 5-8μm band.The multilayer film for infrared stealth based on VO2thermochromism designed by the authors can meet the characteristics of simple film structure,convenient radiation regulation and simple preparation.

Preparation and characterization of Cu2ZnSn(S,Se)4 film by drop-coating of Cu2ZnSnS4 nanoink

In this work,a simple and facile one-pot oleylamine solvothermal synthetic method was developed to synthesize Cu2ZnSnS4（CZTS） nanocrystals.And the Cu2ZnSn（S,Se）4（CZTSSe） thin films were prepared by selenizing CZTS nanocrystals.The obtained CZTS nanocrystals and CZTSSe films were studied using X-ray diffraction（XRD）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM）,energy-dispersive X-ray spectroscopy（EDX）,and ultraviolet–visible spectrophotometer（UV–Vis）.TEM results show that the sphere–like CZTS nanoparticles with diameter between 12 and 35 nm are polydispersed.XRD studies indicate that the prepared CZTS nanocrystals form kesterite crystal structure,and the CZTSSe films with kesterite crystal structure are also obtained at the annealing temperatures of 500 and550 °C.In particular after annealing at 500 °C for 20 min,the CZTSSe film exhibits a smooth,uniform,crack-free,and large-grained topography and possesses Cu-poor and Sn-rich composition.Moreover,it shows strong optical absorption from visible to near-infrared（IR） region,and its optical band gap（Eg） is found to be about 1.44 e V.

Optimization of energy storage properties in(1−x)Na_(0.5)Bi_(0.5)TiO_(3)-xSr_(0.7)La_(0.2)TiO_(3)-relaxed ferroelectric ceramics

Ferroelectric materials are considered to be the most competitive energy storage materials for applications in pulsed power elec­tronics due to excellent charge-discharge properties.However,the low energy storage density is the primary problem limiting their practical application.In this study,(1−x)Na_(0.5)Bi_(0.5)TiO_(3)-xSr_(0.7)La_(0.2)TiO_(3)[(1−x)NBT-xSLT]ferroelectric ceramics are found to exhibit excellent energy storage performances through a synergistic strategy.As the SLT concentration increases,the relaxation characteristic increases significantly and the breakdown strength increases dramatically from 150 kV/cm to 220 kV/cm.The recoverable energy storage density of the _0.55NBT-0.45SLT ceramic is 2.86 J/cm^(3) with an energy storage efficiency of 88%under an electric field of 220 kV/cm.Furthermore,the ceramic with x=0.45 mol exhibited excellent energy storage stability in the ranges of 20-180℃(temperature)and 1-125 Hz(frequency).These excellent properties demonstrate the potential of(1−x)NBT-xSLT ceramics when used as dielectric capacitors in pulsed power systems.

N,N,O-Tridentate One-dimensional Methyl-bridged Heterobimetallic Complex: Synthesis, Crystal Structure and Catalytic Activity

The sequential reaction of the N,N,O-tridentate ligand HOC(CH2)5CH2N(Me)CH2CH2NMe2(LH)in diethyl ether with AlEtCl2 and MeLi afforded a lithium-aluminum complex containing a polymeric structure of one-dimensional chain[{-LiOC(CH2)5CH2N(Me)CH2CH2NMe2}AlMe2CH3-}n](1),which was characterized by 1H,13C NMR spectra,elemental analyses and single-crystal X-ray diffraction analysis.Complex 1 crystallizes in triclinic,space group P1 with a=10.526(3),b=10.949(3),c=17.799(4)?,β=76.211(11)°,V=1915.3(8)?3,Dc=1.014 g·cm–3,F(000)=648 andμ=0.104 mm–1.In addition,the heterobimetallic complex 1 was used to catalyze the Meerwein-Ponndorf-Verley(MPV)reaction and exhibited excellent catalytic activities in good yield(up to 97%).