摘要：Electrocatalytic ammonia synthesis under mild conditions is an attractive and challenging process in the earth’s nitrogen cycle,which requires efficient and stable catalysts to reduce the *** N2 activation and reduction overpotential of different Ti3C2O2-supported transition metal(TM)(Sc,Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,Mo,Ru,Rh,Pd,Ag,Cd,and Au)single-atom catalysts have been analyzed in terms of the Gibbs free energies calculated using the density functional theory(DFT).The end-on N2 adsorption was more energetically favorable,and the negative free energies represented good N2 activation performance,especially in the presence Fe/Ti3C2O2(﹣0.75 eV).The overpotentials of Fe/Ti3C2O2,Co/Ti3C2O2,Ru/Ti3C2O2,and Rh/Ti3C2O2 were 0.92,0.89,1.16,and 0.84 eV,*** potential required for ammonia synthesis was different for different TMs and ranged from 0.68 to 2.33 *** possible potential-limiting steps may be involved in the process:(i)hydrogenation of N2 to*NNH and(ii)hydrogenation of*NH2 to *** catalysts can change the reaction pathway and avoid the traditional N–N bond-breaking *** also simplifies the understanding of the relationship between the Gibbs free energy and overpotential,which is a significant factor in the rational designing and large-scale screening of catalysts for the electrocatalytic ammonia synthesis.

摘要：The development of bifunctional catalysts for the efficient hydrogenation and acceptorless dehydrogenation of N‐heterocycles is a *** this study,Ru_(2)P/AC effectively promoted reversible transformations between unsaturated and saturated N‐heterocycles affording yields of 98%and 99%,***,a remarkable enhancement in the reusability of Ru_(2)P/AC was observed compared with other Ru‐based *** to density functional theory calculations,the superior performance of Ru_(2)P/AC was ascribed to specific synergistic factors,namely geometric and electronic effects induced by P.P greatly reduced the large Ru‐Ru ensembles and finely modified the electronic structures,leading to a low reaction barrier and high desorption ability of the catalyst,further boosting the hydrogenation and acceptorless dehydrogenation processes.

摘要：The nitrogen reduction reaction(NRR)using new and efficient electrocatalysts is a promising al‐ternative to the traditional Haber‐Bosch ***,it remains a challenge to design efficient catalysts with improved catalytic ***,various O‐functional MXenes were investigated as NRR catalysts by a combination of density functional theory calculations and least absolute shrinkage and selection operator(LASSO)***_(3)C_(2)O_(X) has been regarded as a promising catalyst for the NRR because of its stability,activity,and *** poten‐tial‐determining step is*NH_(2) hydrogenation to*NH3 with a limiting potential of-0.45 ***‐more,via LASSO regression,the descriptors and equations fitting the relationship between the properties of O‐functional MXenes and NRR activity have been *** work not only pro‐vides a rational design strategy for catalysts but also provides machine learning data for further investigation.

摘要：从电网自身发展和外部环境变化等方面梳理了电网监视控制所面临的全新挑战,分析了电网监视控制在电网全局态势感知、全局风险防控、多级统一协调控制,以及灵活适应外部环境变化等新需求。针对新挑战和新需求,提出了大电网全局监视控制的新模式,指出其需具备更广阔的监视范围、更多元的监视内容、更强大的实时数据处理能力、更高的数据实时性与一致性等具体内涵。基于"物理分布、逻辑统一"理念,设计了全局监控总体框架,并给出了需要进一步研究的关键技术。

摘要：实验采用部分析因设计探讨对桉木纸浆纤维素接枝丙烯酸制备高吸水树脂的影响因素,并对主要影响因素进行L9(34)正交实验优化最佳制备条件。桉木纸浆纤维素接枝丙烯酸制备高吸水树脂的主要显著影响因素按照影响程度排序为反应温度、引发剂用量、中和度及交联剂用量。桉木纸浆纤维素与丙烯酸及其钠盐接枝共聚的最佳工艺条件为:反应温度60℃,引发剂用量1.0%,中和度70%,交联剂用量0.05%,此条件下制备的高吸水树脂吸水倍率为521g/g。红外光谱图显示,丙烯酸已经成功的接枝到桉木纸浆纤维素分子上。

摘要：介绍了一种适合快速免疫检验要求的散射比浊仪,根据最新的CPR试剂全血检验需求,规划了总体设计方案,除完成散射比浊的基本免疫检验之外,增加了磁力搅拌、恒温装置等。该仪器与PC联机,采用五点定标,使用logit-log函数拟合曲线,从而确保测试指标的准确性。

摘要：广西的岩溶植被类型和物种多样性丰富 ,分为 5个植被型组 8个植被型共 96个群系 ,广西岩溶植被纬度分布由南至北为季节性雨林→含热带成份的常绿落叶阔叶混交林→常绿落叶阔叶混交林 ,生态结构复杂 ,特有成分突出 ,形成特殊的热带亚热带岩溶植物区系。岩溶区生态建设与植被恢复过程中 ,需遵循植被地带性分布规律 ,参照区域性顶极植物群落 ,进行人工群落的重建设计 ,选择优良乡土树种尤其是速生常绿阔叶树种 ,模拟天然植被构建先锋植物群落 ,乔灌藤草优化配置 ,针对生境异质性的主导因子 ,强化岩溶山地造林与封育管理技术 ,有效提高生物生产效率和植被覆盖率 ,开发特有适生的名特优产品 ,带动经济发展。