Fuzzy蕴涵代数的滤子理论刘春辉1,2

在Fuzzy蕴涵代数中引入对合滤子和结合滤子的概念并研究它们的性质, 获得了这两类滤子的几个等价刻画; 讨论了Fuzzy蕴涵代数的对合滤子、结合滤子、关联MP滤子、正关联MP滤子和交换MP滤子间的关系, 证明了一个非空集合为正关联MP滤子当且仅当它既是对合滤子又是交换MP滤子。     

基于非交换剩余格的模糊蕴涵滤子及其性质

对非交换剩余格的结构作了进一步研究。结合模糊数学的思想和方法, 在非交换剩余格上引入了模糊滤子,讨论了模糊滤子与分明滤子之间的关系; 并且在模糊滤子的基础上引入了模糊蕴涵滤子和模糊正蕴涵滤子的概念, 并讨论其基本性质,给出了模糊蕴涵滤子和模糊正蕴涵滤子的等价刻画, 证明了模糊正蕴涵滤子一定是模糊蕴涵滤子, 模糊蕴涵滤子和模糊正蕴涵滤子在一定条件下是等价的。     

格蕴涵代数中多重模糊正关联滤子的研究

在剩余格蕴涵代数中,首先提出了多重模糊正关联滤子的概念,研究了其性质.然后,讨论了多重模糊正关联滤子与模糊滤子、多重模糊正关联滤子与多重正关联滤子、多重模糊正关联滤子与多重模糊关联滤子,及多重模糊正关联滤子与多重模糊正关联滤子的格蕴涵同态像之间的关系.     

剩余格蕴涵代数中n-重素滤子的研究

在剩余格蕴涵代数中,提出了n-重素滤子的概念,并研究了它的性质.讨论了n-重素滤子与关联滤子、n-重素滤子与素滤子、n-重素滤子与准素滤子和对不同的自然数n,n-重素滤子之间的关系.最后,得到了在格H蕴涵代数中,n-重素滤子与素滤子等价和n-重素滤子与准素滤子等价的结论.     

蕴涵格的正规MP滤子与素滤子

在蕴涵格上定义了MP-滤子、生成滤子、正规MP-滤子与素滤子的概念,研究了它们的特征性质,讨论了正规MP-滤子和MP-滤子之间的关系,得到正规MP-滤子是MP-滤子的结论,证明了蕴涵格的素滤子定理。它们是R0-代数或MV-代数上相应滤子的性质的共同特征。     

MTL代数中的布尔滤子和正蕴涵滤子

在MTL代数中,给出布尔滤子的几种等价刻画,提出了正蕴涵滤子和固执滤子的概念,讨论了它们的一些基本性质,得到几类滤子之间及相互转化的关系。证明在满足正则性的MTL代数中,布尔滤子和正蕴涵滤子相互等价,超滤和固执滤子相互等价。     

BR0代数的次极大 滤子

首先通过在砜代数M中引入 滤子,然后又给出了M中次极大 滤子的概念,并讨论了它的性质,得到BR0代数的每个 滤子都可分解为一些次极大 滤子的交,特别地,在满足 滤子降链条件的BR0代数中,每个 滤子都可分解为有限个次极大 滤子的交。     

格蕴涵代数中的直觉模糊关联滤子

在格蕴涵代数关联滤子研究成果的基础上,将直觉模糊集理论与格蕴涵代数的关联滤子的结构及性质相结合,给出了格蕴涵代数中的直觉模糊关联滤子的定义,讨论了格蕴涵代数中直觉模糊滤子和直觉模糊关联滤子之间的关系,证明了在格蕴涵代数中直觉模糊关联滤子是直觉模糊滤子.同时,文中还研究了直觉模糊关联滤子的一些代数性质.     

剩余格上几类n-重模糊滤子的相互关系

运用模糊集的方法和原理,通过在剩余格中引入n-重模糊蕴涵滤子、n-重模糊极滤子、n-重模糊正蕴涵滤子和n-重模糊Boole滤子的概念,得到了剩余格上这几类n-重模糊滤子之间的关系,并证明了剩余格上n-重模糊正蕴涵滤子和n-重模糊Boole滤子相互等价.     

MTL代数的性质及其滤子

讨论了MTL代数的性质,并在其上引入了MP滤子、素MP滤子、布尔滤子的概念;刻画了包含F及α的最小MP滤子的结构;讨论了极大MP滤子与素MP滤子的关系;证明了当F是布尔滤子时,M／～F成为布尔代数．     

盾构机密封舱渣土非线性本构模型参数识别

根据密封舱改性渣土的三轴压缩实验数据,建立了基于优化方法的Duncan-Chang双曲线本构模型参数反演方法。为了解决参数识别反问题解的不稳定性问题,在Gauss-Newton优化迭代算法的基础上,提出了正则化参数反演方法。实际应用结果表明,所提出的反演方法具有较快的收敛速度和较强的鲁棒性,预测的实验模型变形与实验值吻合较好。     

Preparation of Al<Subscript>72</Subscript>Ni<Subscript>8</Subscript>Ti<Subscript>8</Subscript>Zr<Subscript>6</Subscript>Nb<Subscript>3</Subscript>Y<Subscript>3</Subscript> amorphous powders and bulk materials

Amorphous Al₇₂Ni₈Ti₈Zr₆Nb₃Y₃ powders were successfully fabricated by mechanical alloying. The microstructure, glass-forming ability, and crystallization behavior of amorphous Al₇₂Ni₈Ti₈Zr₆Nb₃Y₃ powders were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). The isothermal crystallization kinetics was analyzed by the Johnson–Mehl–Avrami equation. In the results, the supercooled liquid region of the amorphous alloy is as high as 81 K, as determined by non-isothermal DSC curves. The activation energy for crystallization is as high as 312.6 kJ·mol?1 obtained by Kissinger and Ozawa analyses. The values of Avrami exponent (n) imply that the crystallization is dominated by interface-controlled three-dimensional growth in the early stage and the end stage and by diffusion-controlled two- or three-dimensional growth in the middle stage. In addition, the amorphous Al₇₂Ni₈Ti₈Zr₆Nb₃Y₃ powders were sintered under 2 GPa at temperatures of 673 K and 723 K. The results show that the Vickers hardness of the compacted powders is as high as Hv 1215.     

Kinetic parameters of oscillating reaction of amino acid- BrO3^——Mn^2＋-H2SO4-acetone system

In the previous papers[1—3], the oscillating reactionusing amino acids as organic substrates was studied. Inorder to obtain information about the kinetic parameters ofoscillating reaction of amino acids in amino acid- BrO3 - ?Mn2 -H2SO4-acetone sy…     

Electrochemical properties of LiNi<Subscript>0.5</Subscript>Mn<Subscript>1.3</Subscript>Ti<Subscript>0.2</Subscript>O<Subscript>4</Subscript>/Li<Subscript>4</Subscript>Ti<Subscript>5</Subscript>O<Subscript>12</Subscript> cells

Spinel compounds LiNi_0.5Mn_1.3Ti_0.2O₄ (LNMTO) and Li₄Ti₅O₁₂ (LTO) were synthesized by different methods. The particle sizes of LNMTO and LTO are 0.5–2 and 0.5–0.8 μm, respectively. The LNMTO/LTO cell exhibits better electrochemical properties at both a low current rate of 0.2C and a high current rate of 1C. When the specific capacity was determined based on the mass of the LNMTO cathode, the LNMTO/LTO cell delivered 137 mA·h·g⁻¹ at 0.2C and 118.2 mA·h·g⁻¹ at 1C, and the corresponding capacity retentions after 30 cycles are 88.5% and 92.4%, respectively.     

Acid etching process for fabrication of Bi2Sr2CaCu2O8＋x stack

We adopted a new method, acid etching process, to fabricate the intrinsic Josephson junctions based on the Bi2Sr2CaCu2O8 x single crystals. By soaking the crystals into the dilute hydrochloric acid, we fabricated a junction stack successfully, and meantime made the surrounding area insulated. A certain concentration of hydrochloric acid was used to maintain the roughness of the modified layer. The cur-rent-voltage characteristic was achieved through the four terminal measurement. We could control the junctions' number by changing the concentration and the soaking time. We also found that the thick-ness of the stack was equal to the average height of the insulation layer. Such a simple, convenient and controllable fabrication method with a high yield might widen the applications of the intrinsic Joseph-son junctions.     

基于遗传算法的带附加气室空气悬架多目标优化

以带附加气室的空气弹簧悬架为研究对象,按照物理模型建立带附加气室空气弹簧的数学模型,考虑到空气弹簧刚度的非线性,将该模型以空气弹簧非线性力的形式直接引入到1/4车辆模型。以提高车辆平顺性、行驶安全性及操纵稳定性的综合性能为目标,以附加气室容积为优化变量,设计带附加气室空气悬架的多目标优化模型;考虑到悬架性能各指标量在量纲与量级上的差异,对各指标量进行统一化处理,并采用线性加权和法将多目标函数转化为单目标评价函数。在MAT-LAB/Simulink中搭建系统仿真模型,采用遗传优化算法对典型工况下的最优附加气室容积进行寻优。优化结果表明,优化附加气室容积能有效提高悬架的综合性能,降低车身加速度、悬架动行程,但轮胎动载荷有所增加。     

Rolling-induced microstructure change in Zr_（65）Al_（7.5）Ni_（10）Cu_（12.5）Ag_5 bulk metallic glass

The microstructures and free-volume evolutions of as-cast and pre-annealed Zr65Al7.5Ni10Cu12.5Ag5 bulk metallic glasses during rolling deformation have been investigated. No phase transformation is detected in the as-cast/rolled specimen. However,the structural stability of the glass against plastic deformation is worse after pre-annealing,indicated by nanocrystallization in preannealed/rolled specimens with large deformation degrees. Moreover,with increasing deformation degree,the free-volume content in a pre-annealed/rolled specimen increases at a lower average rate than that in an as-cast/rolled specimen.     

Work toughening effect in Zr_（41）Ti_（14）Cu_（12.5）Ni_（10）Be_（22.5） bulk metallic glass

Work hardening is a well-known phenomenon occurring in crystalline metals during deformation,which has been widely used to increase the strength of metals although their ductility is usually reduced simultaneously. Here we report that the plastic strain of Zr41Ti14Cu12.5Ni10Be22.5 (at.%) bulk metallic glasses has been increased from 0.3% for the as-cast sample to 2.5%-8.0% for samples that have experienced pre-deformation under constrained conditions. The pre-deformed glassy alloys possess more free volume and abundant introduced shear bands,which are believed to promote the activation of shear bands in post-deformation and result in an increase in plasticity. The orientation of the pre-introduced shear bands relative to the loading direction will affect the deformation behavior of pre-deformed samples. The present results show that pre-deformation of this glassy alloy will result in work toughening. This work toughening effect can be removed by isothermal annealing at a sub-Tg (glass transition) temperature,which causes annihilation of free volume and healing of shear bands.     

Mutagenesis of Ser24 of Cytochrome b559 α Subunit Affects PSII Acitivies in Chlamydomonas reinhardtii

In order to study the functions of cytochrome b559 (Cyt b559) in photosystem two (PSII) activity, mutant S24F of Chlamydomonas reinhardtii was constructed using site directed mutagenesis, in which Serine24 (Ser24) locating downstream of Histidine23 (His23) in α subunit of Cyt b559 was replaced by Phenylalanine (Phe). Physiological and biochemical analysis showed that mutant S24F could be grown photoautotrophically or photoheterotrophically. However, their growth rate was slower either on HSM or TAP medium than that of the control; Analysis of PSII activity revealed that its oxygen evolution was about 71% of wild type (WT); The Photochemical efficiency of PSII (Fv/Fm) of S24F was reduced 0.23 compared with WT; S24F was more sensitive to strong light irradiance than the wild type; Furthermore, SDS-PAGE and Western-blotting analysis indicated that the expression levels of α subunit of Cyt b559, LHCII and PsbO of S24F were a little less than those of the wild type. Overall, these data suggests that Ser24 plays a significant role in making Cyt b559 structure maintain PSII complex activity of oxygen evolution although it is not directly bound to heme group.     

Investigation on high magnetoresistance Ni0.81Fe0.19 films grown on （Ni0.81Fe0.19）1-xCrx underlayers

We have fabricated Ni0.18Fe0.19 films with (Ni0.18Fe0.19)1-xCrx films as underlayers by dc magnetron sputtering, the results show that larger anisotropic magnetoresistance (△R/R) values of Ni0.18Fe0.19 films are observed using the underlayers with Cr concentration of -36 at.% at an optimum underlayer thickness of -4.4 nm, the maximum AMR value is 3.35%. The results of atomic force microscope (AFM) and X-ray diffraction (XRD) show that the △R/R enhancement is attributed to the formation of large average grain size and the strong(111)texture in the Ni0.18Fe0.19 films.