摘要：Sn-based electrocatalysts have been gaining increasing attention due to their potential contribution in the conversion of CO2 into HCOOH driven by sustainable energy sources;however,their actual capability to catalyze CO2 reduction reaction(CO2RR)still cannot meet the requirements of commercial-scale *** developing Snbased catalyst is of vital ***,the sheet-like heterophase Sn O2/Sn3O4 with a high density of phase interfaces has been first engineered by a facile hydrothermal process,with Sn3O4 as the dominant *** evidences from experiments and theoretical simulation indicate that the charge redistribution and built-in electric field at heterophase interfaces boost CO2 adsorption and HCOO*formation,accelerate the charge transfer between the catalysts and reactants,and ultimately greatly elevate the intrinsic activity of the heterophase Sn O2/Sn3O4 towards CO2 ***,the in-situ generated porous structure and metal Sn during CO2 RR improve the mass transmission within the interlayer volume and the conductivity of Sn O2/*** heterophase Sn O2/Sn3O4 displays high activity and selectivity for CO2 RR,achieving an improvement in CO2 reduction current density,88.3%Faradaic efficiency of HCOOH conversion at-0.9 VRHE,along with a long-term tolerance in CO2 *** study demonstrates that heterophase interface engineering is an efficient strategy to regulate advanced catalysts for different applications.

摘要：以广西梧州市长洲区在建的某国家粮食储备库项目为例,选取跨度为21.5m的粮仓进行设计分析。该粮仓采用非预应力现浇混凝土拱板屋盖排架结构,与常规建筑有所不同,体现在该粮仓的拱板屋盖不仅要对屋盖上、下弦板进行安全验算,还要考虑到整体现浇与局部预制相结合,故论文从结构设计计算的安全合理性到设计图中的注意事项以及施工要求等各个方面展开逐一分析。

摘要：Multi-interface engineering is deemed as an effective strategy to boost catalytic activity via electronic structure modulation. However, it is still a big challenge due to the phase-separation tendency. Herein, we designed CoP-WP heterojunctions with multi-touch interfaces using Co_(8)W_(18), a definite structure polyoxometalate-based polynuclear cobalt molecular cluster, as a precursor. The Co P-WP heterojunctions anchored on reduced graphene oxide(Co P-WP/r GO)were obtained by growing Co_(8)W_(18)on GO followed by phosphorization. The intrinsic {Co-O-W} coordination modes in Co_(8)W_(18)are conducive to the formation of the multiple interfaces between CoP and WP. The abundant intimate interfaces in Co P-WP heterojunctions promote the electron transfer from WP to Co P, thus regulating the interfacial electronic structure and optimizing the hydrogen adsorption free energy(ΔGH*), as verified by X-ray photoelectron spectroscopy analysis and theoretical calculations. Furthermore, the integration of r GO provides Co P-WP/r GO with a large surface area and high conductivity, aiding mass transport and charge transfer. Co P-WP/r GO exhibits remarkable hydrogen evolution reaction(HER) activity with low overpotentials of 96, 130,and 138 m V at 10 m A cm^(-2)in alkaline, acidic and neutral media, respectively, and has long-term durability. Our discovery provides an opportunity to design heterojunction materials with multi-coupled interfaces at low-cost and efficient HER catalysts.

摘要：Large Hollow nanoparticulate aggregates（LHNAs） based on albumin nanoparticles is a promising technology for developing dry powder inhaler（DPI） with good aerodynamic properties in order to provide a new drug delivery system（DDS） for the treatment of lung disease. Improved understanding of molecular interactions could lead to prepare the DDS rationally. Therefore, this investigation utilized computations and experiments to reveal the mechanisms of budesonide（BUD） interactions with bovine serum albumin（BSA） at the molecular level. The molecular dynamics（MD） simulation revealed that there were three critical stable binding sites of BUD on BSA（P1, P2, P3） mainly by hydrophobic interaction and hydrogen bond. The energy decomposition of each residue to the whole BUD-BSA complex system in P1-P3 showed that nonpolar residues in or around the binding site played an important role in the binding of BUD to BSA. The molar ratio was close to 3 in preparations in drug-loading efficiency experiment, which was confirmed to the simulation results. The details of the binding sites from computation provided a guideline for the design of the BSA nanoparticles carrying BUD, which was prepared successfully at last. Combination of the MD simulation and experiment as well as the mechanism of the molecular interaction provided a solid theoretical basis for the preparation of BSA-LHNAs for DPI in the future.

摘要：扁线电机的绕组交流损耗随着转速升高急剧增大,给电机运行效率与温升特性带来极大影响。本文以车用高速扁线电机为研究对象,对比分析了发卡绕组、槽内换位、连续波绕组和端部扭转换位等方案不同绕组拓扑结构的交直流损耗特性,综合考虑选定端部扭转换位绕组作为优选方案。通过加工试制原理验证样机,证明了有限元分析方法的有效性,并基于端部扭转换位绕组电机进行了优化设计。针对绕组换位引起的定子槽满率下降问题,提出了基于定子阶梯槽型的优化思路。最后,以车用电机全运行速域内的效率分布特性为基准,对比分析了阶梯槽端部扭转换位方案、端部扭转换位方案和发卡绕组方案的效率分布特性。结果表明,与端部扭转换位方案相比,阶梯槽端部扭转换位方案高速运行时的效率提升约0.2%到0.6%。

摘要：凋落物分解是草地生态系统能量流动和物质循环的重要过程,而荒漠草原凋落物分解如何响应碳(C)、氮(N)、钾(K)添加尚不清楚,揭示这一关系对深入理解荒漠草原养分循环过程具有重要意义。本研究选用网袋分解法,进行随机区组设计,在试验样地分别设置C_(1)(0 g·m^(-2)·a^(-1))、C_(2)(52.54 g·m^(-2)·a^(-1))、C_(3)(705.09 g·m^(-2)·a^(-1));N_(1)(0 g·m^(-2)·a^(-1))、N_(2)(5 g·m^(-2)·a^(-1))、N_(3)(20 g·m^(-2)·a^(-1));K_(1)(0 g·m^(-2)·a^(-1))、K_(2)(9.0 g·m^(-2)·a^(-1))、K_(3)(18.0 g·m^(-2)·a^(-1))3个C、N、K浓度梯度,研究外源C、N、K添加对宁夏荒漠草原优势种短花针茅和赖草凋落物分解特征的影响。结果表明:(1)C、N、K添加对荒漠草原两个物种凋落物分解的影响具有显著差异(P短花针茅;(3)短花针茅和赖草凋落物均在秋季分解较快。综上,同一生境不同物种凋落物分解速率存在差异,高添加量的K、N和低添加量的C相较于其他养分添加梯度,对凋落物分解速率的促进作用更明显。

摘要：为深入了解荒漠草原植物物种多样性和群落稳定性对N、P添加的响应,本研究以宁夏盐池县荒漠草原为研究对象,自2020年开始,每年开展N、P添加试验,连续进行3年。试验采用随机区组设计,N肥选用尿素,P肥选用过磷酸钙,本文使用2022年9月的植被调查数据。结果表明:(1)高水平N复合中、高水平P添加显著降低了物种丰富度指数和Shannon-Wiener指数,高水平N复合中水平P添加显著降低了Simpson指数;(2)Godron稳定性分析发现,对照组欧式距离最大,群落稳定性最低;在单独添加P时,群落稳定性随着P添加量的增加而逐渐增强;(3)荒漠草原物种多样性与群落稳定性表现为正相关关系。综上所述,高水平的N、P添加可以通过抑制荒漠草原植物生长,使得物种多样性降低,单独P添加以及中、低水平的P与高水平的N复合添加可有效提高群落的稳定性。

摘要：为了探讨广告干预对危机品牌的消费者品牌态度和信任的影响,采用实验组与控制组对照的前测后测设计,其中实验组采用2×2因素型被试间实验设计。结果表明:广告干预对被试的内隐品牌态度发生了一定程度的影响,对被试的外显品牌态度和品牌信任则发生了很大程度的影响;高渗透广告相较于低渗透广告能驱使消费者对危机品牌产生更为正向的外显品牌态度;理性诉求广告相较于感性诉求广告能驱使消费者对危机品牌产生更为正向的外显品牌态度;广告的渗透程度和诉求方式对内隐品牌态度的影响存在交互作用;品牌信任受双重态度驱动。

摘要：从某种层面来说,沉浸其实是一个非常原始的概念和古老的美学问题,无论是我国古典艺术创作中所追求的“境界”,还是西方酒神文化中的“狂迷”、悲剧文化中的“净化”等都是沉浸感的重要美学特性。通过对“沉浸”概念的追溯、数字时代审美感官问题的分析、数字沉浸式艺术审美发生机制的探讨,结合传统美学范畴与命题中的“意境”“审美经验”“审美距离”“移情作用”,从美学的视角考察沉浸式体验,有助于为数字艺术领域深层次情感的共鸣、知识的传递、趣味性的设计等审美发生机制提供一定的借鉴。

摘要：表面活性物质的表面张力等温线测定是大学物理化学实验的重要内容。随着磷脂类表面活性剂的广泛应用,有必要在大学化学中更新经典表面张力等温线测定的实验内容,并使学生掌握先进的测量方法。以二硬脂酰基磷脂酰胆碱(DSPC)和二棕榈酰基磷脂酰胆碱(DPPC)为研究对象,应用界面张力仪测定了两种溶液表面张力等温线,计算了其表面超量和分子横截面积,并设计了拓展性实验内容,对于培养学生分析问题和解决问题的能力具有积极的意义。