水热法制备Sr_2FeNiO_6催化剂及其催化性能研究

采用水热法制备双钙钛矿催化剂Sr_2FeNiO_6,考察不同浓度KOH溶液(4 mol·L~(-1)、6 mol·L~(-1)、8 mol·L~(-1)、10 mol·L~(-1)、12 mol·L~(-1)、14 mol·L~(-1))对催化剂性能的影响,利用X射线衍射、比表面积测定、程序升温还原和扫描电镜等对样品进行性能表征,并以催化甲烷燃烧为目标,考察催化剂催化性能。结果表明,矿化剂KOH浓度对样品性能影响较大,当浓度为10 mol·L~(-1)时,起燃温度最低,T_(10%)为430℃;浓度为8 mol·L~(-1)时,样品比表面积最大,为19.0 m~2·g~(-1),完全燃烧温度最低,T_(90%)为610℃。     

白酒中风味物质分析研究进展

白酒是我国传统而又独具特色的蒸馏酒，也是世界六大蒸馏酒之一。白酒中含有多种风味化合物，包括酯类、醇类、酮类、醛类、酸类、萜烯类、含硫化合物等，这些风味物质虽然含量很低，但风味物质的组成及含量对白酒口感和香味的贡献很大，是形成不同酒类风格的重要因素。该文主要对近年来白酒中风味物质种类、风味物质分析前处理技术、风味物质测定方法及功能性风味成分相关研究进行了综述，以期为白酒中风味物质分析与鉴定提供一定的参考。     

Simulation of police shooting stability training based on FPGA and sensors

Stability training refers to the practice, while the surface is unstable and activation stabilizer muscles of the trunk and goals, which may ignore other forms of exercise. For stability, the train network control system is caused by network latency and packet drop out of school. The current study aimed to analyze the accuracy of necessary shooting skills and check the balanced posture, stability, and rifle shooting performance bracelets. There is no burden on the body in different performance groups. No. Equivalent continuous-time model, proposed account. The train network control system model uses Romanov theory, some new analytical techniques to get in, and less conservative results. It will be completed. The effectiveness of the proposed method of numerical display. The proposed training in the correct use of architecture to shape muscle memory training interns position signal trainee lead to incorrect behavior. Students warned that the recent shooting would be suspended after the retry using the selected function when needed for phase detection of unnecessary or excessive exercise pistol. Combined with real-time biofeedback applications, it can lead to accelerated learning, training the number of shots that poverty can be reduced, thereby saving time and costs.     

蓝莓红豆复合饮料的研究

以蓝莓和红豆为主要原料研制复合果蔬饮料,利用单因素和正交试验,通过感官评价和沉降率优化饮料风味配方和稳定性。采用感官评分对色泽、滋味、气味、组织状态进行评价,得到最佳配方为:蓝莓汁20%、红豆汁15%、蔗糖6%、柠檬酸0.1%。通过离心沉降速率和感官评价指标研究稳定剂对饮料的稳定效果,得到稳定性配方为羧甲基纤维素钠0.05%、黄原胶0.05%、海藻酸钠0.1%。对蓝莓红豆复合饮料的杀菌条件进行初步探索,在70℃杀菌30 min条件下,微生物检测指标和理化指标均符合国家标准。     

A novel combination of precursor pyrolysis assisted sintering and rapid sintering for construction of multi-composition coatings to improve ablation resistance of SiOC ceramic modified carbon fiber needled felt preform composites

A double-layer coating composed of MoSi₂–SiO₂–SiC/ZrB₂–MoSi₂–SiC was designed and successfully constructed by a novel combination of precursor pyrolysis assisted sintering and rapid sintering to improve the ablation resistance of SiOC ceramic modified carbon fiber needled felt preform composites (CSs). The ZrB₂–MoSi₂–SiC inner layer coating was in relatively uniform distribution in the zone of 0–3 mm from the surface of CSs through the slurry/precursor infiltration in vacuum and SiOC precursor pyrolysis assisted sintering, which played a predominant role in improving oxidation and ablation resistance and maintaining the morphology of CSs. The MoSi₂–SiO₂–SiC outer layer coating was prepared by the spray and rapid sintering to further protect CSs from high-temperature oxidation. The ablation resistance of CSs coated with double-layer coating was evaluated by an oxygen-acetylene ablation test under the temperature of 1600–1800 °C with different ablation time of 1000 and 1500 s. The results revealed that the mass recession rates increased with the rise of ablation temperature and extension of ablation time, ranging from 0.47 g/(m²·s) to 0.98 g/(m²·s) at 1600–1800 °C for 1000 s and from 0.72 g/(m²·s) to 0.86 g/(m²·s) for 1000–1500 s at 1700 °C, while the linear recession rates showed negative values at 1700 °C due to the formation of oxides, such as SiO₂ and ZrO₂. The ablation mechanism of the double-layer coating was analyzed and found that a SiO₂–ZrO₂–Mo_4.8Si₃C_0.6 oxidation protection barrier would be formed during the ablation process to prevent the oxygen diffusion into the interior CSs, and this study provided a novel and effective way to fabricate high-temperature oxidation protective and ablation resistant coating.     

The investigation of gold/zirconia as a photocatalyst for the direct synthesis of imines from alcohols and aniline

Au/ZrO₂ nanoparticles have been widely used as photocatalysts in various organic syntheses because of their localized surface plasmon resonance (LSPR) effects. In our work, Au/ZrO₂ has been synthesized by a solution method and it was used as a heterogeneous catalyst in the synthesis of imines from alcohols and aniline with irradiation by visible light. The reaction occurred in two steps: step 1 was the aerobic oxidation of the alcohols and step 2 was the nucleophilic addition of aniline. Dimethyl sulfoxide (DMSO) was used as a solvent in the reaction. The selectivity in the synthesis of imines over 3 wt% Au/ZrO₂ (with mean particle size of 5 nm) was high (over 90%) with irradiation by visible light at room temperature, and an obvious difference in the conversion was observed between the reactions with light irradiation and those without light. The intensity and wavelength of the light strongly affected the reaction. The Au/ZrO₂ could be used at least 5 times. A reaction mechanism was proposed based on the experimental results. The results indicate that the reaction of alcohols and aniline using Au/ZrO₂ as the photocatalyst can proceed under mild conditions. Furthermore, this process is environmentally friendly and green.     

Construction of cultural industry development factor model based on factor analysis,artificial intelligence and big data

The rapid development of the level of social informatization has allowed the content related to computer science to advance with the times and have derived two fields of big data and artificial intelligence. Specifically, the theory and methods of artificial intelligence themselves provide key support for big data. On the other hand, big data also provides auxiliary means for the research and analysis of artificial intelligence. Artificial intelligence will become the mainstream development trend of the future society, and the application of big data technology under the background of artificial intelligence will also be systematic in many fields. This paper analyzes the internal and external factors in the development of cultural industry by means of econometric research methods and big data and artificial intelligence, principal component analysis, factor analysis and multiple regression analysis, establishes the model of cultural industry development factors, breaks through the traditional research methods, analyzes the impact of the core, foundation, environment, kinetic energy, efficiency, potential and other factors on the comprehensive index of the development of cultural industry, and analyzes the comparative advantages and development trend of cultural industry in all provinces and municipalities of China. In this paper, the "three elements" model is comprehensively demonstrated by quantitative and qualitative methods, which solves the problem of lack of qualitative and quantitative research methods in cultural industry.     

砂、石含水量对混凝土强度影响分析与控制

通过案例分析，露天堆放的砂、石料，由于含水量不确定。必须在配制混凝土时，预先测出砂、石的含水率．调整施工配合比。以确保混凝土强度，保证工程质量及安全。