摘要：The exchange bias is of technological significance in magnetic recording and spintronic *** a large bias field is a long-term goal for the research field of magnetic shape memory *** this work,a large bias field of 0.53 T is achieved in the Ni50Mn34In16-xFex(x=1,3,5)system by tuning the magnetic ground state(determined by the composition x)and the magnetic-field history(determined by the magnetic field HFCduring field cooling and the maximum field HMaxduring isothermal magnetization).The maximum volume fraction of the interfaces between the ferromagnetic clusters and antiferromagnetic matrix and the strong interfacial interaction are achieved by tuning the magnetic ground state and the magnetic-field history,which results in strong magnetic unidirectional anisotropy and the large exchange ***,two guidelines were proposed to obtain the large bias ***,the composition with a magnetic ground state consisting of the dilute spin glass and the strong antiferromagnetic matrix is preferred to obtain a large bias field;secondly,tuning the magnetic-field history by enhancing HFCand reducing HMaxis beneficial to achieving large exchange *** work provides an effective way for designing magnetically inhomogeneous compounds with large exchange bias.

摘要：Stacking nanoscale-building blocks into onedimensional(1D)assemblies with collective physical properties is a frontier in designing ***,the formation of 1D arrays using weak magnetic fields and an in-depth understanding of their magnetic properties remain ***,low-dimensional assemblies of iron oxide nanocubes with a disordered arrangement are fabricated at the diethylene-glycol/air interface in the presence of assembly fields(0/1/3/5/30/50 mT).Ring-shaped assemblies gradually transform as the assembly field increases from 0 to 50 mT,first to a porous network consisting of elongated assemblies and then to an aligned array of filaments,in which the aligned filaments are formed when the assembly field is≥3 mT and duration t>14 ***-glass characteristics and static(dynamic)anisotropy factors~2(3)are achieved by tuning the strength of the assembly *** the presence of a relatively weak assembly field,the interplay between dipolar interactions and disorder with respect to magnetic easy axis alignment leads to spin-glass *** alignment of the magnetic easy axes and the strength of the dipolar interactions increase with increasing assembly field,resulting in the disappearance of spin-glass characteristics and enhancement of the magnetic *** study presents a strategy for obtaining magnetic assemblies with spin-glass behavior and controllable anisotropy while shedding light on the magnetic interactions of low-dimensional assemblies.

摘要：为了更加智能化地实现国家电网公司设计的公共数据模型(SG-CIM)的业务需求和提高图谱数据本身的质量和共享程度,提出一种基于图注意力网络的图结构映射模型。首先基于SG-CIM模型的数据构建SG-CIM模型知识图谱和数据库表知识图谱,然后通过图注意力网络分别学习每个图中的实体嵌入,将实体嵌入统一向量空间,最后基于实体向量之间的距离计算相似度,得到2个图的图结构映射结果。实验表明,本文提出的模型在SG-CIM数据模型自动映射方面得到相当不错的结果。

摘要：针对现有蛇形机械臂驱动机构繁琐、整机体积过大、模型建立复杂等问题,设计了一种新型蛇形机械臂.采用杠杆型驱动结构,利用1个伺服电机同时控制2根驱动绳索,从而减少驱动数量、降低能耗.利用正交关节实现位置闭环控制,简化运动学模型.同时,针对蛇形机械臂的不同工作环境,提出尖顶从动控制策略及基于位置闭环的控制方法.前者提高了机械臂的柔顺性,控制简单;后者实现了机械臂的空间重复定位.最后,通过实验证明了所设计机械臂的合理性以及控制方法的有效性.

摘要：高速的城市化进程带来一系列生态破坏和环境污染等可持续发展挑战,需要在城市规划阶段尽量规避这些风险。生态基础设施建设倡导生态系统修复和环境协同治理的理念,是新兴城市化背景下指导城市规划的一种有效手段。目前,国内外生态基础设施建设在宏观尺度研究比较系统,而在小尺度的研究相对欠缺。我国社区等小尺度生态基础设施建设,由于规模较小,缺乏网络化构建,导致了建设后雨水内涝、面源污染问题仍层出不穷。构建了一种城市小尺度生态基础设施的设计方法和技术流程,以雄安新区启动区为研究区开展生态基础设施设计:(1)基于实际调研与理论研究分析场地现状,综合考虑自然要素、物理感知、心理感知、生态过程等相关因素构建“廊道为骨,斑块为节”的生态基础设施体系;(2)辨识区域主要动物活动、迁徙以及保护植物多样性等功能生态斑块,构建串联全城提供多种功能的系统性廊道、增加城市内部生态系统服务的结构性廊道、将生态系统服务渗入城市肌理的局部功能性廊道;(3)从景感满意度和年径流总量控制率2个方面进行生态基础设施建设预期效果评估。研究结果有助于缓解雄安新区建设所面临生态环境问题,保障人居生活环境品质,并为今后城市建设工作提供参考。

摘要：以4-溴查尔酮为目标分子,通过逆合成分析法,从6条路线中分析出含有5项诺贝尔奖成果的合成途径,通过对比,最后选择出2021年诺奖成果“纯有机催化”室温合成4-溴查尔酮。以新试剂L-脯氨酸为催化剂,室温下通过对溴苯甲醛和苯乙酮的羟醛缩合反应合成4-溴查尔酮,并进行一系列正交实验,优化反应条件。该反应具有原料价格低廉、反应条件温和等优点。通过简单的反应,将多项诺奖成果与纯有机催化引入实验教学中,避免“照方抓药”式教学,紧贴科学前沿,深化有机合成学习,有利于培养学生创新意识。

摘要：介绍了一种解决工序冲突的方案以及冲压模具结构,即下模设计整体托芯结构并将其他工序需求放置在托芯上,从而实现上翻整形与普通侧翻、侧冲等冲突工序的合并.通过该方案,可减少一序模具,降低制作成本,减少生产周期.