Discharge characteristics and abatement of volatile organic compounds using plasma reactor packed with ceramic Raschig rings

Discharge characteristics and abatement of volatile organic compounds using plasma reactor packed with ceramic Raschig rings were investigated. It was found that the gap equivalent capacitance decreased with increasing voltage while the dielectric barrier equivalent capacitance increased initially and stabilized at about 700 pF. Compared with empty reactor, toluene removal was significantly enhanced by ceramic Raschig rings, 97% against 48%. With respect to the energy yield in the presence of padding, the efficiency was remarkably improved up to 10 g/kWh, which was 2 times higher than that of 5 g/kWh in the absence of padding with removal ratio exceeding 50%.     

Bonded exciplex formation from stacked thymine and adenine: semiclassical simulations

The nonradiative decay of a π-stacked adenine and thymine, following excitation of thymine by an ultrafast laser pulse, was studied by semiclassical dynamics simulations. The simulation found that a bonded exciplex is formed after excitation due to strong interaction between the stacked bases. The strong interaction significantly lowers the energy gap between the LUMO and HOMO and consequently facilitates the deactivation of the electronically excited molecule. It also restricts the deformation vibration of the excited thymine molecule, which slows down the coupling between the HOMO and LUMO energy levels and delays the deactivation of the excited adenine molecule to the electronic ground state.     

复合绝热通道技术在谐相互作用调制的Landau-Zener模型中的应用

将复合绝热通道技术应用于谐相互作用调制的Landau-Zener模型, 研究了调制频率和耦合强度在不同的参量条件下系统的跃迁概率, 发现这种方法能够有效抑制跃迁概率的非绝热振荡, 可以在很大的参数范围内使布居数完全反转, 实现超高保真度,将系统的误差降低到10^-4以下. 关键词： 复合绝热通道技术 Landau-Zener模型 跃迁概率     

SnO2 meso-scale tubes: One-step,room temperature electrodeposition synthesis and kinetic investigation for lithium storage

SnO₂ meso-scale tubes were synthesized by anodic electrochemical deposition under ambient conditions. Controlled self-bubbling O₂ acted as both the template and the oxidizing agent for obtaining SnO₂ tube structures at the interface of the gas (O₂) and the liquid (electrolyte). Electrochemical testing showed that the meso-scale tubes have higher discharge capacity and better rate capability than the “microbowls” produced by varying the deposition conditions. From the Arrhenius plot, the apparent activation energies were calculated to be 58.4 and 90.1 kJ mol^?1 for the meso-scale tubes and the microbowls, respectively, indicating that the meso-scale structure allows shorter diffusion routes for the lithium ions or for easier interaction with lithium.     

Closedness of ranges of upper-triangular operators

In this paper, the closedness of ranges and Kato non-singularity of upper triangular operator matrices are investigated.     

Electrochemically deposited boronate affinity extracting phase for covalent solid phase microextraction of cis-diol biomolecules

A new format of solid phase microextraction (SPME), boronate affinity SPME, was proposed for the first time for covalent extraction of cis-diol containing biomolecules. This new SPME format is based on the reversible complex formation between boronic acids and 1,2- and 1,3-cis-diols. The complex formation and dissociation can be facilely controlled by changing pH. An extracting phase of poly-3-aminophenylboronate (polyAPBA) electrochemically deposited on a metal wire was employed to demonstrate the concept of this new methodology. Catechol and riboflavin were used as the test analytes, and the SPME extraction was combined off-line with high-performance liquid chromatographic (HPLC) separation followed by UV absorbance or fluorescence detection. Fundamental aspects, such as selectivity, extraction/desorption equilibrium, linearity, effect of competing compounds, reproducibility and life-time, were first investigated. Then the developed method was applied to beer samples since the content of riboflavin plays an important role in the flavor stability of beverages. Excellent performance of the SPME fibers was observed for both standard and real samples. Particularly, the expected excellent features of the polyAPBA extracting phase were experimentally verified, which include specific selectivity, eliminated matrix effect and manipulable capture/release. The new methodology of SPME can be a promising tool since a lot of 1,2- and 1,3-cis-diol-containing compounds are of great biological importance.     

Phylogenetic inference from binary sequences reduced by primary DNA sequences

Given a bi-classification of nucleotides, we can obtain a reduced binary sequence of a primary DNA sequence. This binary sequence will undoubtedly retain some biological information and lose the rest. Here we want to know what kind of and how much biological information an individual binary sequence carries. Three classifications of nucleotides are explored in the present article. Phylogenetic trees are built from these binary sequences by the Neighbor-Joining (NJ) method, with evolutionary distance evaluated on the basis of a symbolic sequence complexity. We find that, for all data sets studied, binary sequences reduced by the purine/pyrimidine classification give reliable phylogeny (almost the same as that from the primary sequences), while the other two result in discrepancies at different levels. Some possible reasons and a simple model of sequence evolutionary are introduced to interpret this phenomenon.     

闭式硼烷[B10H10]2－的反应性及其衍生物的应用研究进展

多面体硼烷化合物以其独特的结构、成键和多方面的潜在应用价值而被广泛研究. 综述了近20年来闭式(closo)硼烷[B10H10]2－的反应性(笼上氢取代、开笼-重排、开笼-金属插入等类型)及其衍生物的应用(硼中子俘获肿瘤治疗、放射性同位素萃取分离、新型材料、超分子化学等方面)研究进展.