院级科研平台信息化管理模式研究

院级科研平台是实践教学、科学研究、创新人才培养的重要物质资源,是高校实力与科研水平的重要指标。综述了院级科研平台组成要素及管理模式发展的三个阶段,并在此基础上提出了一种基于移动终端的信息化管理模式。分析了该模式的实践应用,探索了高校科研平台未来管理模式智能化的发展趋势。实践证明,基于移动终端的信息化管理模式是目前院级科研平台十分有效的管理模式,能够提高院级科研平台的科研效能和仪器设备的利用率。     

Nd掺杂Bi4Ti3O12-SrBi4Ti4O15陶瓷的电性能

Nd等价取代Bi_4Ti_3O_(12)-SrBi_4Ti_4O_(15)的A位,形成SrBi_(8-x)Nd_xTi_7O_(27)(x=0.00～1.50)共生陶瓷.结果表明:Nd掺杂未改变晶体的共生结构,样品剩余极化(2P_r)在掺杂量x=0.50时取得极大值,为32.3×10~(-2) C·m~(-2),比未掺杂时增加了70%,而矫顽场则从未掺杂时的90.5×10~5 V·m~(-1)上升为103×10~5 V·m~(-1).Nd掺杂使得样品的居里温度(t_C)有所下降,x=0.50时的t_C为538℃.掺杂使得样品的压电性能明显改善,压电系数d_(33)从未掺杂时的6 pC·N~(-1)增加到x=0.50时的11 pC·N~(-1).     

Hybrid entanglement concentration assisted with single coherent state

Hybrid entangled state(HES) is a new type of entanglement, which combines the advantages of an entangled polarization state and an entangled coherent state. HES is widely discussed in the applications of quantum communication and computation. In this paper, we propose three entanglement concentration protocols(ECPs) for Bell-type HES, W-type HES, and cluster-type HES, respectively. After performing these ECPs, we can obtain the maximally entangled HES with some success probability. All the ECPs exploit the single coherent state to complete the concentration. These protocols are based on the linear optics, which are feasible in future experiments.     

Optimal multi-photon entanglement concentration with the photonic Faraday rotation

We put forward an optimal entanglement concentration protocol(ECP) for recovering an arbitrary less-entangled multi-photon Greenberger–Horne–Zeilinger(GHZ) state into the maximally entangled GHZ state based on the photonic Faraday rotation in low-quality(Q) cavity. In the ECP, only one pair of less-entangled multi-photon GHZ state and one auxiliary photon are required, and the concentration task can be realized by local operations. Moreover, our ECP can be used repeatedly to further concentrate the discarded items of conventional ECPs, which can increase its success probability largely. Under the practical imperfect detection condition, our protocol can still work with relatively high success probability. This ECP has application potential in current and future quantum communication.     

High-performance artificial neurons based on Ag/MXene/GST/Pt threshold switching memristors

Threshold switching (TS) memristors can be used as artificial neurons in neuromorphic systems due to their continuous conductance modulation, scalable and energy-efficient properties. In this paper, we propose a low power artificial neuron based on the Ag/MXene/GST/Pt device with excellent TS characteristics, including a low set voltage (0.38 V) and current (200 nA), an extremely steep slope (< 0.1 mV/dec), and a relatively large off/on ratio (> 10³). Besides, the characteristics of integrate and fire neurons that are indispensable for spiking neural networks have been experimentally demonstrated. Finally, its memristive mechanism is interpreted through the first-principles calculation depending on the electrochemical metallization effect.     

Ba2YRu1-xCuxO6陶瓷的结构和磁性

采用固相反应技术合成了Cu掺杂的Ba2YRu1-xCuxO6(x=0,0.1,0.15)体系.多晶X射线衍射表明3种样品均具有双倍周期的钙钛矿结构,属于立方晶系;计算得出Ba2YRuO6的晶格常数a为0.834 nm,而Cu的掺杂对晶格常数影响很小.基于双倍周期晶胞的多晶衍射理论计算表明,Y离子和Ru离子分别有序占据原子等效位置,且发现(111)衍射峰为有序分布时的特征峰.利用振动样品磁强计(VSM)技术测量了样品的室温磁化曲线,表明样品在室温下呈现典型的顺磁行为.     

微课程在实验室安全与仪器操作培训中的应用

信息技术的快速发展促使微课程教学模式成了当今十分受欢迎的教学模式。通过合理设置微课程的基本要素和精心设计培训的教学方式,将微课程教学模式应用于科研实验室安全培训和仪器操作培训,能够有效提升新教师和研究生新生参加培训的学习效果,保证科研实验室的正常运转,有效避免事故的发生。长期实践结果表明:微课程这种教学模式应用到科研实验室安全培训和仪器操作培训上是十分有效的,既提高了学习效率,又提高了培训的合格率。     

Sr2YRu1-xZnxO6结构、磁性及电输运特性

采用固相烧结工艺制备了Sr2YRu1-xZnxO6(x=0,0.1,0.2)陶瓷样品,采用多晶X射线和扫描电子显微镜技术对样品的物相成分、晶体结构和晶体表面形貌进行了表征与分析,将Sr2YRu1-xZnxO6(x=0,0.1,0.2)样品X射线衍射谱与理论模拟多晶样品X射线标准谱比较显示样品单相已经形成.X射线的实验结果表明:样品均形成了在a-b方向上具有双倍周期的钙钛矿结构,属于立方晶系,晶体空间群为Fm3m(No 225).Sr2YRuO6原胞为立方结构(a=0.816 4 nm),Y离子和Ru离子分别有序占据4a(0,0,0)和4b(1/2,1/2,1/2)原子等效位置.并且发现样品X射线衍射谱中的(111)衍射峰为B位Y离子和Ru离子有序占据时的特征峰.实验显示Zn离子取代Ru离子对晶胞参数影响很小.振动样品磁强计(VSM)测量了在常温下样品Sr2YRu1-xZnxO6(x=0,0.1,0.2)磁化强度与磁场强度的关系,样品在常温下显示顺磁性.计算得到Sr2YRuO6中Ru离子的有效磁矩为2.417 μB.用标准的四端子测量方法测量了样品的电阻随温度的关系,样品电阻随掺杂量的增加而降低,并且实现了由反铁磁绝缘体向半导体转变.     

重修班数字电路实验教学改革初探

数字电路实验在培养学生科学思维和创新能力等方面起着重要的作用,然而,在规定的课时内,重修班的学生完成实验的质量却较差。因此,采取了一系列教学改革措施,经过两届不同专业学生组成重修班的尝试,教学结果表明教学改革取得了较好的效果。在确保教学质量的前提下,学生课程通过率、对知识点的理解、掌握和应用,较之前有了较大的提高,学生科学思维和创新能力得到进一步培养。     

数模转换实验中物理思维培养研究

物理思维是理工科大学生重要的科学素质,在大学生教育与培养过程中需要继续提高的重要一环,物理思维的培养有助于学生构建合理的知识结构和提高创新能力,所以在工科生电工电子实验中加强物理思维的培养显得十分重要,我们就以数模转换实验为例,谈谈物理思维的培养,给今后的实验教学提供一定的参考。