Spin determination by in-plane angular correlation analysis in various coordinate systems

In the excitation of the resonant state followed by the sequential cluster-decay,the in-plane angular correlation method is usually employed to determine the spin of the mother nucleus.However,the correlation pattern exhibited in a two-dimensional angular-correlation spectrum depends on the selected coordinate system.In particular,the parity-symmetric and axial-symmetric processes should be presented in a way to enhance the correlation pattern,whereas the non-symmetric process should be plotted separately to reduce the background.In this study,three coordinate systems previously adopted for correlation patterns in the literature are described and compared to each other.The consistency among these systems is evaluated based on the experimental data analysis for the 10.29-MeV state in ~(18) O.A spin-parity of 4~+ is obtained for all three coordinate systems.     

Hybrid OCS/OBS interconnect in intra-data-center network

We report on a data center network(DCN) architecture based on hybrid optical circuit switching(OCS) and optical burst switching(OBS) interconnect for dynamic DCN connectivity provisioning. With the combination of the centralized and distributed control of the software-defined optical networks, the proposed interconnect can achieve unprecedented flexibility in dealing with both mice and elephant flow in the DCN. Numerical simulation is employed to investigate the performance of the proposed architecture. The results show that the OBS module has preferable performance in dealing with a larger burst packet, and the throughput is constrained by the capacity of the server random access memory module.     

Real-time phase measurement and correction of dynamic multimode beam using a single spatial light modulator

In this Letter,a novel system for adaptively correcting the phase of a dynamic multimode beam is proposed.While using merely one spatial light modulator,the phase measurement of the first-order diffraction pattern and the correction of the zeroth diffraction order are simultaneously realized.The real-time experimental result is obtained at a control rate of 10 Hz.The power-in-the-bucket value is improved from 38.5%to 61.8%,even with fundamental mode content that is consistently below 30%.To the best of our knowledge,this is the first implementation of real-time adaptive correction of the entire multimode beam.     

Identifying anomalous Floquet edge modes via bulk-edge correspondence

Floquet engineering appears as a new protocol for designing topological states of matter,and features anomalous edge modes pinned at quasi-energy π/T with vanished topological index.We propose how to predict the anomalous edge modes via the bulk Hamiltonian in frequency space,and use Zak phase to quantitatively index the topological properties.The above methods are clarified by the example of time periodic Kitaev chain with chemical potential of harmonic driving and pulse driving,and topological phase transitions are manifested at different driving frequencies.     

Green synthesis,characterization and physiological stability of gold nanoparticles from Stachys lavandulifolia Vahl extract

The synthesis of nontoxic stable gold nanoparticles is important for medical applications.An aqueous extract of the plant Stachys lavandulifolia Vahl was used to synthesize gold nanoparticles.This green method involved the S.lavandulifolia Vahl extract acting as a reducing and stabilizing agent.The nanoparticles were characterized by transmission electron microscopy,dynamic light scattering analysis and UV-vis absorption and Fourier transform-infrared spectroscopies.Stability under physiological conditions is important for medical applications.The stability of the nanoparticles was compared with that of conventional citrate-capped nanoparticles,under both synthetic and physiological conditions.The nanoparticles synthesized from the S.lavandulifolia Vahl extract were stable under physiological conditions,in contrast with conventional citrate-capped nanoparticles.     

减反膜对单晶硅太阳能电池性能的影响分析

在太阳能电池效率的评价中，电池材料、掺杂浓度、扩散长度等都是比较重要的参数，合理地改变相关参数可以优化太阳能电池的性能，提高电池效率。此外，在太阳能电池表面镀一层具有减反作用的光学薄膜（简称减反膜）也是提高电池效率的重要手段。以提高电池效率为目标，对单晶硅太阳能电池的掺杂浓度和扩散长度等微观参数进行计算优化，分析了掺杂浓度和扩散长度变化对电池效率的影响。并在此基础上分析了不同类型的减反膜对于电池效率的影响，给出了最佳减反膜材料及其膜系厚度，并且结合镀膜后电池量子效率的变化验证了其准确性。结果表明，在优化电池掺杂浓度和扩散长度的基础上，选择合适的减反膜，电池效率最高可达20.35%，相比于优化前提高了8.25%。     

Reversible potassium storage in ultrafine CFx: A superior cathode material for potassium batteries and its mechanism

Current studies of cathodes for potassium batteries(PBs) mainly focus on the intercalation-type materials.The conversion-type materials that possess much higher theoretical capacities are rarely discussed in previous literatures.In this work,carbon fluoride(CF_x) is reported as a high capacity conversion-type cathode for PBs for the first time.The material delivers a remarkable discharge capacity of>250 mAh g^-1 with mid-voltage of 2.6 V at 20 mA g^-1.Moreover,a highly reversible capacity of around 95 mAh g^-1 is achieved at 125 mA g^-1 and maintained for 900 cycles,demonstrating its excellent cycling stability.The mechanism of this highly reversible conversion reaction is further investigated by nuclear magnetic resonance spectra,X-ray diffraction,and transmission electron microscopy studies.According to the analyses,the C-F bond in the cycled material is different from that in the pristine state,which presents relatively higher reversibility.This finding offers important insights for further improving the performance of the CF_x.This work not only demonstrates the CF_x as a high performance cathode for PBs,but also paves a new avenue of exploring conversion-type cathodes for high energy density PBs.