分数次积分交换子的加权不等式

对分数次积分算子和BMO函数构成的高阶交换子, 该文给出了强型和弱型的加权不等式.     

双亲性稠环双卟啉的合成和自组装研究

在稠环双卟啉分子两侧的卟啉环上分别连接亲水和疏水性取代基,合成双亲性稠环双卟啉分子。利用紫外-可见光谱和核磁氢谱考察了它们在不同溶剂中的溶解行为。结果表明,当双卟啉环两侧取代基的亲疏水性差异足够大时,在亲水性溶剂中,两侧取代基溶解性的差异所提供的附加亲疏水作用,可以引导稠环双卟啉分子通过π-π堆积作用形成H-聚集体。这种自组装形成的一维柱状超分子聚集体,在分子光电器件等领域具有潜在的应用前景。     

Electrochemical performances of a novel lithium bis(oxalate)borate-based electrolyte for lithium-ion batteries with LiFePO4 cathodes

Lithium bis(oxalate)borate (LiBOB) is a promising salt for lithium-ion batteries. However, it is necessary to exert the electrochemical performance of LiBOB by the appropriate solvent. With dimethyl sulfite (DMS) as mixed solvents, the electrochemical behavior of γ-butyrolactone (GBL) with LiBOB is studied in this paper. It shows that LiBOB-GBL/DMS electrolyte has high oxidation potential (>5.3 V) and satisfactory conductivities. When used in lithium and mesophase carbon microbead cells, the novel electrolyte exhibits not only excellent film-forming characteristics but also low impedances of the interface films. Besides, when used in LiFeO₄/Li cells, compared to the cell with the electrolyte system of 1 mol L^?1 LiPF₆–ethylene carbonate (EC)/dimethyl carbonate (DMC) (1:1, v/v), LiBOB-based electrolyte exhibits several advantages, such as more stable cycle performance at room temperature and higher mean voltage.     

利用Adomain分解法求时间分数阶薛定谔方程的近似解

非线性薛定谔方程是现代科学中非常普遍的非线性模型之一。通过 Adomain分解,得到了（2＋1）维和（3＋1）维非零势阱时间分数阶薛定谔方程的近似解。利用Adomain 分解不用像相关文献中那样将解函数的实部和虚部分别去求解,从而简化了求解过程。     

Single-crystal structure,photophysical characteristics and electroluminescent properties of bis(2-(4-trifluoromethyl-2-hydroxyphenyl)benzothiazolate)zinc

In this paper, a zinc (II) complex of Zn₂(4-tfmBTZ)₄ (4-tfmBTZ=2-(4-trifluoromethyl-2-hydroxyphenyl)benzothiazolate) was reported. Via combination of experimental and theoretical approaches, its molecular structure, photophysical characteristics, electronic structure and electroluminescent properties were investigated. The results indicate that Zn₂(4-tfmBTZ)₄ exists as five-coordinate geometric structure and two zinc atoms are bridged by oxygen atoms. The intense absorption band was located at 404 nm, which mainly originate from the transition HOMO?1 to LUMO+2. The blue-light emission was observed in tetrahydrofuran solution and thin film. White-light emission with four emission peaks was observed with CIE coordinate of (0.29, 0.33) and a higher CRI of 85.1 by fabricating bilayer device using Zn₂(4-tfmBTZ)₄ as electron-transport and NPB as hole-transport material.     

Disulfide-Containing Detergents (DCDs) for the Structural Biology of Membrane Proteins

Disulfide-containing detergents (DCDs) are introduced, which contain a disulfide bond in the hydrophobic tail. DCDs form smaller micelles than corresponding detergents with linear hydrocarbon chains, while providing good solubilization and reconstitution of membrane proteins. The use of this new class of detergents in structural biology is illustrated with solution NMR spectra of the human G protein-coupled receptor A_2AAR, which is an α-helical protein, and the β-barrel protein OmpX from E. coli.     

Multi-objective optimization of laser transmission joining of thermoplastics

A central composite rotatable experimental design (CCRD) was used to plan the experiment of laser transmission joining of thermoplastic. Response surface methodology (RSM) was employed to establish the mathematical relationships between the joining process parameters (laser power, joining velocity, clamp pressure, scanning number) and the three responses (the joint strength, joint width and joint cost) and then the optimization capabilities in design-expert software were used to carry out the multi-objective optimization of the joining process. In this paper, the models were tested for adequacy using analysis of variance, the predicted errors were calculated, the effects of joining process parameters were determined, and the optimal conditions were identified. It is demonstrated that the predicted results of the optimization are in good agreement with the experimental results, so this study provides an effective instruction to enhance the joint quality and minimize the joint cost.     

C/粉煤灰复合吸附材料的制备及表征

以粉煤灰和蔗糖为原料,浓硫酸为炭化剂,制备了一种新型的C/粉煤灰复合吸附材料。 采用X光电子能谱、红外吸收光谱、场发射扫描电子显微镜、X射线衍射及N2气吸附实验对所制备复合材料进行了表征。 结果表明,粉煤灰表面被类石墨态炭纳米颗粒所包裹,复合材料表面密集分布着大量的介孔,Brunauer-Emmett-Teller(BET)比表面积SBET=5.4 m2/g,并且在该复合材料表面含有丰富的-SO3H、-COOH和-OH等含氧官能团。 考察了所制备的复合材料对典型阳离子型染料亚甲基蓝及重金属离子的吸附能力,结果表明,该复合材料具有优异的吸附性能,其对亚甲基蓝的吸附能力达到活性炭的83.7%,对典型重金属离子的吸附能力优于市售活性炭。 所制备复合材料可作为活性炭的一种替代品,用于水中有机染料和重金属离子的吸附处理。     

水下超音速气体射流胀鼓和回击的关联性研究

阐述了水下超音速气体射流的实验研究结果. 用高速摄影仪实时记录了水下超音速气体射流喷射的状态, 清晰地演示了射流气体在上中游流域的演化过程. 具体分析了水下高速气体射流的动态不稳定性形貌, 并从实时记录的射流照片中统计测量出了胀鼓和回击随机频率.结果发现, 胀鼓频率越大, 回击频率越大; 胀鼓频率随着喷嘴的驻室压力与出口背压的比值增大而增大. 通过胀鼓与回击事件前后实验数据的对比分析表明其二者之间存在相关性: 胀鼓和回击均由射流内部压力振荡引发并且存在一定的随机性; 胀鼓是回击前的能量积聚一个前征和表现, 当胀鼓的振荡即能量积聚到一定程度后, 引发回击.