摘要：In this paper, a new four-dimensional autonomous hyperchaotic system is designed for generating complex chaotic signals. In the design, its parameters are selected according to the requirements for chaos and hyperchaos. The hyperchaotic nature is verified theoretically by using the bifurcation analysis and demonstrated experimentally by the implementation of an analogue electronic circuit. Moreover, the Field Programmable Gate Array （FPGA） technology is applied to implementing a continuous system in a digital form by using a chip of Altera Cyclone II EP2C35F484C8. The digital sequence generated from the FPGA device is observed in our experimental setup.

摘要：In this paper a fast digital real-time spectrometer was developed for timing and analysis of nuclear pulse *** hardware system design and algorithm implementation with field-programming gate array(FPGA) and digital signal processor(DSP) were *** performance of the digital constant fraction discrimination(dCFD) platform was experimentally tested with Agilent 80 MHz function/arbitrary waveform generator and LaCl 3:Ce 3+ scintillator detector for 22 Na positron annihilation gamma *** amplitude and time information of photon was online *** energy resolution could be 5.525% and the timing resolution 293.75 ps,the system error estimation of dCFD approach was also *** results showed that this spectrometer achieved a timing resolution close to that of traditional CFD timing resolution with a more simplified system structure.

摘要：For modern particle physics experiments,trigger-less data acquisition(DAQ) system has been put into practice because of the need of reaction multiplicity and trigger *** such new DAQ systems,global synchronized clock plays an important role because it affects the granularity of time slice and precision of reference *** this paper,a novel synchronized clock distribution method is *** the help of modulation technique,master clock module distributes system clock to each slave *** synchronize slave clocks,the propagation delay is adjusted and the clock phase is aligned by an FPGA chip ***,an ADCbased method is proposed to evaluate the performance of multi-module clock synchronization *** experiments of a prototype system show that slave clocks can be synchronized less than 100 ps over 150 m *** proposed method is simple and flexible,and it can be used in trigger-less DAQ system and other applications of clock distribution preciously.

摘要：In this paper,a general method of data transmission system design on PXI platform is *** can be used in readout system design for physical *** aims at providing reusable and general interfaces for customized design of PXI while maintaining the transmission *** has three main features:(1)universal logic hardware interface,(2)ethernet based socket software interface,and(3)specific and simple data transmission *** transmission on PXI bus can be realized with the said two universal interfaces coordinated by this specific *** shows that this method is feasible and *** method can be easily reused in readout system designs for different experiments.

摘要：In order to realize safe and accurate homing of parafoil system,a multiphase homing trajectory planning scheme is proposed according to the maneuverability and basic flight characteristics of the *** this scenario,on the basis of geometric relationship of each phase trajectory,the problem of trajectory planning is transformed to parameter optimizing,and then auxiliary population-based quantum differential evolution algorithm(AP-QDEA)is applied as a tool to optimize the objective function,and the design parameters of the whole homing trajectory are *** proposed AP-QDEA combines the strengths of differential evolution algorithm(DEA)and quantum evolution algorithm(QEA),and the notion of auxiliary population is introduced into the proposed algorithm to improve the searching precision and *** simulation results show that the proposed AP-QDEA is proven its superior in both effectiveness and efficiency by solving a set of benchmark problems,and the multiphase homing scheme can fulfill the requirement of fixed-points and upwind landing in the process of homing which is simple in control and facile in practice as well.

摘要：具有高发光性能的二维材料被认为是实现光电器件应用的极具前途的材料.其中,硒化铟(InSe)是一种具有代表性的二维材料,近些年在光电领域表现出巨大的应用潜力,因此吸引了研究者们的广泛关注.然而,InSe的光-物质相互作用极其微弱,因为其带隙激子的偏振取向是面外的,主要被面外偏振光激发而对正常入射光(面内偏振)的响应极其微弱,这大大限制了其在光电器件中的实际应用.在此,我们提出了一种方法,即通过将少层InSe转移到Ag纳米棱镜阵列上,显著提升InSe在线性和非线性体系的光学响应.结合实验分析,增强的机理主要来自于两种机制的协同作用:一方面,局域表面等离子体共振产生的局部强化电磁场垂直分布于金属表面,与面外偏振的InSe带隙激子发生高效耦合,增强了InSe的光-物质相互作用;另一方面,独特设计的弯曲结构增加了入射光在平面外的偏振分量,促使InSe面外激子对光的吸收和散射效率增强.通过进一步调整InSe的厚度,我们实现了光致发光和二次谐波信号的两个数量级的增强.因此,我们的工作为改善InSe的光学特性提供了一个有效的途径,使其在光电器件的实际应用中迈出了重要的一步.

摘要：We develop an improved design of thin gap chamber （TGC） simulation signal source. To further simulate the feature of TGC detector, a novel thought is proposed. The TGC source has 256 channels. Every channel can randomly output the signal in 25 ns. The design is based on true random number generator （TRNG）. Considering the electrical connection between the TGC source and the developing trigger electronics, the GFZ connector is used. The experimental results show that the improved TGC simulation signal source can uniformly output the random signal in every channel. The output noise is less than 3 mVrms.

摘要：光束缚在科学和技术上的重要价值使之成为了一个学界不断探索的研究领域.光束缚可利用材料或者结构反射镜实现,也可利用拓扑保护连续区束缚态构成的无反射镜结构实现.将面内反射边界与连续区束缚态结合,即可实现一类具有极高品质因子、极小模式体积的新型片上光学微腔.具体来说,利用光子晶体异质结构引入的光子禁带在水平方向将光约束在有限区域内,同时调控动量空间中连续区束缚态构成的拓扑星座实现垂直方向上的光约束,最终可实现全三维空间中的光束缚.本文在实验中观测到了高达1.09×10^(6)的品质因子,其模式体积仅为17.74(λ_(0)/n)^(3).多个样品表征结果的统计分析表明,该设计具有优秀的工艺鲁棒性.本研究为在微小尺度上实现光束缚提供了一种新的设计范式,在光子集成、非线性光学以及量子计算等领域具有可期的应用前景.

摘要：Based on the first ionization chamber （IC） prototype, the structure, working gas component and electrode material of the IC are improved. The test of the improved IC shows that the plateau length is about 2000 V, the plateau slope is less than 0.2%/100 V, the sensitivity is 19.6 pA/rad·h 1, the up-limitation of the linearity can be up to 3.6×105 rad/h, and the applied voltage can be operated to 3500 V. The test results show that the performance of the improved IC meets the requirements of the beam loss monitor.

摘要：科学正在进入一个新时代——第五范式——它被认为是知识整合到不同领域的主要特征,是基于无所不在的机器学习系统的计算社区中智能驱动的工作。在此,我们通过在天河一号超级计算机系统上构建的催化材料专门设计的典型平台案例,生动地阐明了第五范式的本质,旨在促进第五范式在其他领域的培养。第五范式平台主要包括模型自动构建(原始数据提取)、指纹自动构建(神经网络特征选择)以及跨学科知识串联的重复迭代(“火山图”)。与分解一起进行的是对迭代中实现的体系结构的性能评估。通过讨论,第五范式的智能驱动平台可以极大地简化和改进研究中极其繁琐和具有挑战性的工作,并通过补偿机器学习中缺少样本和替代一些由于计算资源不足而导致的数值计算来实现数值计算与机器学习之间的相互反馈,从而加速探索过程。在数据驱动的学科中,跨学科专家的协同作用和对动态数据需求的急剧增长仍然是一个挑战。我们相信,对第五范式平台的一瞥可以为其在其他领域的应用铺平道路。