Effects of three-body interactions on the dynamics of entanglement in spin chains

With the consideration of three-body interaction, dynamics of pairwise entanglement in spin chains is studied. The dependence of pairwise entanglement dynamics on the type of coupling, and distance between the spins is analyzed in a finite chain for different initial states. It is found that, for an Ising chain, three-body interactions are not in favor of preparing entanglement between the nearest neighbor spins, while three-body interactions are favorable for creating entanglement between remote spins from a separable initial state. For an isotropic Heisenberg chain, the pairwise concurrence will decrease when three-body interactions are considered both for a separable initial state and for a maximally entangled initial state, however, three-body interactions will retard the decay of the concurrence in an Ising chain when the initial state takes the maximally entangled state.     

一些反演关系的反演链

本文主要提出和讨论了一般反演关系的反演链和反演对的理论.在此基础上,具体给出Gould-Hsu反演的两类反演链和Gould-Hsu反演的q-模拟的相关问题.最后,本文结合一些常用的反演对,建立了众多的组合恒等式.     

Ferromagnetic Properties of Bond-Dilution and Random Positive or Negative Uniaxial Anisotropy Blume-Capel Model

We study the ferromagnetic properties of spin-1 system, which is considered in the frame of the bonddilution and random positive or negative anisotropy Blume-Capel model in the effective field theory and a cutting approximation. The investigation of phase diagrams displays some rich properties of the trajectory of tricritical point,reentrant phenomena at low temperatures. Under certain both bond concentrations and random negative anisotropy,there are new transition lines of double tricritical points. So special emphasis is placed on the influence of the bond dilution and random anisotropy on phase diagrams. The magnetizations of the system are also discussed. Some results have not been revealed in previous reports.     

粘结剂对形貌各异的石墨负极电化学性能的影响

As an important component in electrodes, the choice of an appropriate binder is significant when fabricating lithium-ion batteries (LIBs) with good cycle stability and rate capability, which are used in numerous applications, especially portable electronics and eco-friendly electric vehicles (EVs). Semi-crystalline poly(vinylidene fluoride) (PVDF), which is a traditional and widely used binder, cannot efficiently accommodate the volume changes observed in the anode during the charge-discharge process while binding all the components in the electrode together, which results in increased internal cell resistance, detachment of the electrode components, and capacity fading. Herein, we have investigated a highly polar and elastomeric polyacrylonitrile-butadiene (NBR) rubber for use as a binder in LIBs, which can accommodate graphite particles of different shapes compared to semi-crystalline PVDF. Prior to our electrochemical tests, NBR was analyzed using thermogravimetric analysis (TGA) and X-ray diffraction (XRD), showing good thermal stability and an amorphous morphology. NBR is more conformable to irregular surfaces, which results in the formation of a homogeneous passivation layer on both spherical and flaky graphite particles to effectively suppress any electrolyte side reactions, further allowing more uniform and fast Li ion diffusion at the electrolyte/electrolyte interface. As a result, the electrochemical performance of both spherical and flaky shape graphite electrodes was significantly improved in terms of their first cycle Coulombic efficiency (CE) and cycle stability. With comparative specific capacity, the first cycle CE of the NBR-based spherical and flaky graphite electrodes were 87.0% and 85.5%, compared to 85.3% and 82.6% observed for their corresponding PVDF-based electrodes, respectively. After 1000 discharge-charge cycles at 1C, the capacity retention of the NBR-based graphite electrodes was significantly higher than that of PVDF-based electrodes. This was attributed to the good stability of the solid electrolyte interphase (SEI) formed on the graphite electrodes and the high stretching ability of the elastomeric NBR binder, which help to accommodate the repeated volume fluctuation of graphite observed during long-term charge-discharge cycling. Electrochemical impedance spectroscopy (EIS) and microscopic analysis (SEM and TEM) were carried out to investigate the formation and evolution of the SEI layers formed on the spherical and flaky graphite electrodes. The results show that thin, homogeneous, and stable SEI layers are formed on the surface of both spherical and flaky graphite electrodes prepared using the NBR binder. When compared to the PVDF-based graphite electrodes, the graphite electrodes constructed using NBR showed decreased resistance in the SEI layer and faster charge transfer, thus enhancing the electrode kinetics for Li ion intercalation/deintercalation. Our study shows that the electrochemical performance of spherical and flaky graphite electrodes prepared using the NBR binder is significantly improved, demonstrating that NBR is a promising binder for these electrodes in LIBs.     

xLi2MnO3-(1-x) Li[Ni0.8Co0.15Al0.05]O2(0.5 ≤ x ≤ 0.8)的结构和电化学性能

采用喷雾干燥法结合后续的热处理,成功地制备了一系列新型的基于富锂层状固溶体Li_2MnO_3和Li[Ni_(0.8)Co_(0.15)Al_(0.05)]O_2结合的xLi_2MnO_3-(1-x)Li[Ni_(0.8)Co_(0.15)Al_(0.05)]O_2(0.5≤x≤0.8)材料,并对其晶体结构、表面形貌、元素价态以及电化学性能进行了一系列的研究。实验结果表明,随着x值的增大,材料的晶体结构逐渐从层状的Li[Ni_(0.8)Co_(0.15)Al_(0.05)]O_2过渡到类Li_2MnO_3结构。对样品进行淬火处理对晶粒的微观晶体结构和元素价态产生复杂影响,这种变化使得淬火的样品表现出较好的电化学性能。其中x=0.6的样品淬火后表现出较好的电化学性能,100次循环后可逆容量可达209 mAh·g~(-1)。     

二级学院大型仪器管理探索与实践

各国家重点实验室及高校的校级公共测试中心的大型仪器管理已经发展的较为成熟,但是二级学院的大型仪器设备管理还有待加强.就二级学院大型仪器的科学管理进行了探索与实践,旨在提高其利用率和共享性,充分发挥大型仪器的使用效益.     

Synthesis of Amphiphilic ABCBA-Type Pentablock Copolymer from Consecutive ATRPs and Self-Assembly in Aqueous Solution

Summary: A novel amphiphilic ABCBA-type pentablock copolymer with properties that are sensitive to temperature and pH, poly(2-dimethylaminoethyl methacrylate)-block-poly(2,2,2-trifluoroethyl methacrylate)-block-poly(ε-caprolactone)-block-poly(2,2,2- trifluoroethyl methacrylate)-block-poly(2-dimethylaminoethyl methacrylate) (PDMAEMA- b-PTFEMA-b-PCL-b-PTFEMA-b-PDMAEMA), was synthesized via consecutive atom transfer radical polymerizations (ATRPs). The copolymers obtained were characterized by gel permeation chromatography (GPC) and ¹H nuclear magnetic resonance (NMR) spectroscopy, respectively. The aggregation behaviors of the pentablock copolymers in aqueous solution with different pH (pH = 4.0, 7.0 and 8.5) were studied. Transmission electron microscopic images revealed that spherical micelles from self-assembly of the pentablock copolymer were prevalent in all cases. The mean diameters of these micelles increased from 34, 46, to 119 nm when the pH of the aqueous solution decreased from 8.5, 7.0, to 4.0, respectively.     

依赖机器的两台机自由作业排序问题

文章研究加工时间仅依赖于机器的两台机自由作业排序问题 O2 | pij = pi, p2 < p1 < 2p2, Non-Idle | ΣCj。项思明和唐国春(1998)证明了可将该问题转化成指派问题。俞文ci 和应刚(1998)给出了这一问题的显式解,并用较长的篇幅证明其显式解的正确性;他们还举例说明所给出的显式最优排序并不排除其他形式的最优解的存在;但他们未说明所给出的显式解何时才是唯一最优解。本文将给出问题 O2 | pij = pi, p2 < p1 < 2p2, Non-Idle | ΣCj的显式解的直观的最优性证明,并讨论问题显式解何时是唯一的最优解。     

Entanglement Resonance of End Spins in Different Spin Chains

The entanglement resonance in anisotropic spin-1/2 Heisenberg chains of different couplings is investigated when the nearest neighbor coupling is periodically modulated with external magnetic field. When the modulation frequency equals twice of the magnetic field, the entanglement resonance is larger than that at other modulation frequencies and decreases as the number of spins in the chain increases. When the modulation frequency equals the
magnetic field, the entanglement resonance can be reduced to a quite low value by varying the coupling along z axis.