摘要：通过高分子辅助溶胶凝胶自旋涂沉积法在(100)取向的SrTiO_(3)衬底上制备出LaCoO_(3)/LaMnO_(3)双层膜。在LaMnO_(3)表面生长一层LaCoO_(3)膜后,由于二者结构对称性差异,最终会在膜层界面处形成非对称界面耦合。由于非对称耦合作用,双层膜的铁磁转变温度从单层LaMnO_(3)的262 K下降为200 K。此外,由于界面处Mn-O-Co的双交换作用,与单层LaMnO_(3)薄膜的矫顽场相比,双层膜的矫顽场增大了约500%。研究结果表明,不同结构和性质的薄膜重组为多层膜的基础研究和高性能功能材料的应用提供了一种新的结构设计途径。

摘要：A Z-scheme is a promising approach to achieve broad-spectrum photocatalysis. Integration of TiO2 with another semiconductor with a band gap of -1.0 eV would be ideal to harvest both ultraviolet and visible-near infrared light for photocatalysis; however, most narrow-bandgap semiconductors have straddling band structure alignments with TiO2, constituting an obstacle to forming the Z-scheme for photocatalytic hydrogen production. In this communication, we demonstrate Ag2S as a model system where the energy band upshift of the narrow-bandgap semiconductor that shares an interface with a metal can overcome this limitation. To fabricate the design, we developed a unique approach to synthesize Ag2S-Ag-TiO2 hybrid structures. The obtained ternary hybrid structures exhibited dramatically enhanced performance in photocatalytic hydrogen pro- duction under full-spectrum light illumination. The activities were significantly higher than the sum of those of Ag2S-Ag-TiO2 structures under λ〈 400 nm and λ 〉 400 nm irradiation as well as those of their counterparts under any light illumination conditions.

摘要：Carbon monoxide(CO)is recognized as a diffusible and biologically membrane-permeable ***,the question of whether extracellular and intracellular CO delivery would yield similar or distinct biological functions remains *** this study,utilizing nonmetallic CO-releasing micelles as a platform for localized CO delivery,we present evidence suggesting that selective antibacterial effects against Staphylococcus aureus(***)are exclusively evident upon intracellular CO release,even in cases of extracellular release with higher CO concentrations showing no comparable *** substantiate this assertion,we systematically design micellar nanoparticles with varying sizes,monomer sequences,and shell *** these variants,only the micelles taken up by *** and capable of intracellular CO release exhibit efficient bacteria-killing *** further demonstrate that the selective bactericidal effect is closely linked to the production of hydroxyl radicals after intracellular CO ***,intracellular CO release proves to be an efficient treatment for ***-induced skin abscesses without the need for additional antibiotics,showcasing synergistic antibacterial and anti-inflammatory *** findings underscore the pivotal role of the spatial location of CO release,significantly enhancing our understanding of the pathophysiological functions of gasotransmitters.

摘要：高次谐波腔被用于同步辐射光源中拉长束团,降低束团密度,从而提高束流寿命,并且对光源亮度影响很小。理论推导了加入高次谐波腔之后的有关纵向束流动力学方程,计算了改造后的合肥光源(HLS-II)在加入三次谐波腔时最优条件下的寿命改善因子为2.9,束团长度为45.65 mm;计算还表明束团在均匀填充模式下谐波腔中的束流负载效应对束团拉伸的影响可以忽略。经过大量数值模拟计算,优化设计了一个带有高次模阻尼的三次谐波腔。

摘要：Rapid industrialization has accordingly increased the demand for *** has resulted in the increasingly severe energy and environmental *** production,based on the photocatalytic water splitting driven by sunlight,is able to directly convert solar energy into a usable or storable energy resource,which is considered to be an ideal alternative energy source to assist in solving the energy crisis and environmental ***,the hydrogen production efficiency of single phase photocatalysts is too low to meet the practical *** construction of heterostructured photocatalyst systems,which are comprised of multiple components or multiple phases,is an efficient method to facilitate the separation of electron‐hole pairs to minimize the energy‐waste,provide more electrons,enhance their redox ability,and hence improve the photocatalytic *** summarize the recent progress in the rational design and fabrication of nanoheterostructured *** heterojunction photocatalytic hydrogen generation systems can be divided into type‐I,type‐II,pn‐junction and Z‐scheme junction,according to the differences in the transfer of the photogenerated electrons and ***,a summary and some of the challenges and prospects for the future development of heterojunction photocatalytic systems are discussed.

摘要：目的调查相关营养评估指标与卒中后抑郁(poststroke depression,PSD)的关系,分析营养指标预测老年缺血性脑卒中患者发生PSD的表现,为护理人员早期识别PSD高危患者,优化脑卒中管理,改善预后提供参考依据。方法于2022年9月至2023年5月在深圳市1所医院神经内科选取239例老年缺血性脑卒中患者为研究对象。采用自行设计的问卷,收集患者一般人口学资料及疾病相关信息;采用白蛋白、微型营养评定简表(Mini Nutritional Assessment Short Form,MNA-SF)、老年营养风险指数(Geriatric Nutrition Risk Index,GNRI)评估患者的营养状况;采用医院焦虑抑郁量表的抑郁分量表(Hospital Anxiety and Depression Scale-Depression,HADS-D)评估卒中后抑郁情况。采用二元逻辑回归分析,分析卒中后抑郁相关影响因素,并采用受试者工作特征曲线分析方法比较营养指标的表现。结果老年缺血性脑卒中患者平均年龄为71.10±7.41岁,男性占66.5%(159/239),PSD发生率为32.6%(78/239)。不同营养指标的低值组PSD的发生率显著大于高值组,差异均具有统计学意义(P<0.05)。二元逻辑回归分析表明白蛋白(OR,0.681;95%CI,0.508~0.913,P=0.010)、GNRI(OR,1.238;95%CI,1.034~1.483,P=0.020)、MNA-SF(OR,0.708;95%CI,0.614~0.815,P<0.001)是影响PSD的因素(P<0.05)。白蛋白、GNRI和MNA-SF 3个指标联合预测老年缺血性脑卒中患者PSD的ROC曲线下面积最大,有较高的区分度(AUC,0.738;敏感度为75.6%,特异度为60.9%)。结论由白蛋白、GNRI、MNASF联合组成的营养评价指标可作为预测老年缺血性脑卒中营养不良患者发生PSD风险的辅助工具。需要护理人员在更多样化的患者群体中进行进一步的验证,以证明预测的准确性。

摘要：Supports are commonly implemented in the industrial application of heterogeneous catalysts to improve the stability and recyclability of *** supported catalysts often show the enhanced activity and selectivity in various catalytic ***,the specific contributions of electronic and steric effects to a catalytic system often remain elusive due to the lack of well-defined model *** this work,two types of uniform Pd nanocrystals covered by{111}facets in tetrahedral and octahedral shapes,respectively,are synthesized with identical chemical environment and loaded on Ti O_2supports to form hybrid structures(Pd{111}-Ti O_2)towards the application of formic acid *** observation suggests that the polarization effect at the interface of Pd-Ti O_2enhances its activity in formic acid ***,the Pd tetrahedrons-Ti O_2hybrid structure whose Pd{111}-Ti O_2interface possesses a larger angle shows higher catalytic activity,owing to the reduced steric effect as compared to Pd octahedrons-Ti O_*** study reveals the nature of interface effects in formic acid decomposition,and provides a guidance for the related catalyst design.

摘要：本文研究随机双线性系统大范围渐进稳定性.利用数学期望不等式给出了随机双线性系统渐进稳定的新标准.设计了一种非线性状态反馈控制器,利用类Riccati不等式推出了Markov切换随机双线性系统大范围依概率渐进稳定的充分条件.数值算例表明本文提出的方法是可行的.

摘要：高活性MOF基催化剂的设计和合成为促进动力学不利的氧还原反应(ORR)过程开辟了新的途径.本研究通过在ZIF-8前驱体表面涂覆二茂铁甲酸,然后进行两步炭化工艺,设计和制备了一种具有新型结构的高效电催化剂,以提高ORR性能.两步炭化过程对于将热解Fe_(3)C纳米颗粒封装到碳纳米管(CNTs)中以及将Fe单原子隔离到N掺杂碳(NC)基体上至关重要.此外,Fe元素的相对含量对优化催化剂的ORR性能至关重要.所制得Fe_(3)C@CNTs/NC-M催化剂结构先进,在碱性溶液中表现出良好的长期稳定性和电催化ORR性能,其半波电位和极限电流分别达到0.941 V和6.31 mA cm^(-2).此外,该电催化剂在甲醇溶液中具有较强的耐受性和良好的稳定性.Fe_(3)C@CNTs/NC-M锌空气电池(ZAB)具有1.525 V的开路电位,420 mA cm^(-2)时的峰值功率密度为348 mW cm^(-2),10 mA cm^(-2)时的最大容量为843 mA h g_(Zn)^(-1).因此,这种合成策略为构建具有有效和稳定的ORR性能的MOF基电催化材料提供了一条有效途径.

摘要：Photocatalytic H2 evolution reactions on pristine graphitic carbon nitrides(g-C3N4),as a promising approach for converting solar energy to fuel,are attractive for tackling global energy concerns but still suffer from low *** this article,we report a tractable approach to modifying g-C3N4 with vanadyl phthalocyanine(VOPc/CN)for efficient visible-light-driven hydrogen production.A non-covalent VOPc/CN hybrid photocatalyst formed viaπ-πstacking interactions between the two components,as confirmed by analysis of UV-vis absorption *** VOPc/CN hybrid photocatalyst shows excellent visible-light-driven photocatalytic performance and good *** optimal conditions,the corresponding H2 evolution rate is nearly 6 times higher than that of pure *** role of VOPc in promoting hydrogen evolution activity was to extend the visible light absorption range and prevent the recombination of photoexcited electron-hole pairs *** is expected that this facile modification method could be a new inspiration for the rational design and exploration of g-C3N4-based hybrid systems with strong light absorption and high-efficiency carrier separation.