方波信号的傅里叶分解实验

选择通用设备，建立了一个简易的周期信号傅里叶分析系统，通过其测试了方波信号各谐波成份的频率和幅度值，验证了方波信号的傅氏展开关系．     

Uniqueness of entire functions

Let f be a nonconstant entire function and let a be a meromorphic function satisfying T(r,a)=S(r,f) and a?a′. If f(z)=a(z)⇔f′(z)=a(z) and f(z)=a(z)⇒f″(z)=a(z), then f≡f′, and a?a′ is necessary. This extended a result due to Jank, Mues and Volkmann.     

二苯并四氮杂[14]轮烯金属配合物电子结构和性质

用量子化学半经验方法和从头算对二苯并四氮杂[14]轮烯（Tmtaa)离子及其金属配合物的电子结构进行了详细的研究.讨论了轮烯金属配合物合成的模板效应及金属离子半径大小对模板效应的影响作用,对其亲电取代反应的活性位置作了相应理论解释.依据理论计算结果指导了轮烯配合物的定向亲电取代反应及新金属配合物的合成尝试,理论计算与实验事实基本一致.Tmtaa-Ni等配合物及其亲电取代反应产物的1HNMR谱、19FNMR谱表明金属配合物中金属离子对位C7、C16上的H原子被取代,与理论计算结果十分一致.     

Facile low-temperature polyol process for LiFePO4 nanoplate and carbon nanotube composite

Crystalline LiFePO₄ nanoplates were incorporated with 5 wt.% multi-walled carbon nanotubes (CNTs) via a facile low temperature polyol process, in one single step without any post heat treatment. The CNTs were embedded into the LiFePO₄ particles to form a network to enhance the electrochemical performance of LiFePO₄ electrode for lithium-ion battery applications. The structural and morphological characters of the LiFePO₄–CNT composites were investigated by X-ray diffraction, Fourier Transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy. The electrochemical properties were analyzed by cyclic voltammetry, electrochemical impedance spectroscopy and charge/discharge tests. Primary results showed that well crystallized olivine-type structure without any impurity phases was developed, and the LiFePO₄–CNT composites exhibited good electrochemical performance, with a reversible specific capacity of 155 mAh g⁻¹ at the current rate of 10 mA g⁻¹, and a capacity retention ratio close to 100% after 100 cycles.     

Electrostatic measurement of dischargeable electricity and bioelectric potentials produced by muscular movements in flies

A simple electrostatic apparatus was devised to measure dischargeable electricity and bioelectric potentials produced by flies. The apparatus involved two insulated electrodes, ICW(−) and ICW(+), oppositely charged with equal voltages supplied by two voltage-generators. In the electric field, the flies became net positive by instantaneously discharging their electricity and were attracted to negative surface charges on ICW(−). The tail-lifting movement by the attracted insect was an action creating electric potentials that could cause discharge of ICW(−). The discharge transiently appeared in response to individual movements and was larger when the tail was lifted at higher angles.     

W-代数W(2,2)的单参数量子形变(英文)

众所周知,泛包络代数的量子形变所对应的量子群结构是依据所给代数的单根系给出的.我们构造了q-形变W代数Wq,并给出其非平凡的量子群结构.     

Spin-flip effects in a parallel-coupled double quantum dot molecule

We investigate theoretically the electronic transport through a parallel-coupled double quantum dot (DQD) molecule attached to metallic electrodes, in which the spin-flip scattering on each quantum dot is considered. Special attention is paid to the effects of the intradot spin-flip processes on the linear conductance by using the equation of motion approach for Green’s functions. When a weak spin-flip scattering on each quantum dot is present, the single Fano peak splits into two Fano peaks, and the Breit–Wigner resonance may be suppressed slightly. When the spin-flip scattering strength on each quantum dot becomes strong, the linear conductance spectrum consists of two Breit–Wigner peaks and two Fano peaks due to the quantum interference effects. The positions and shapes of these resonant peaks can be controlled by using the magnetic flux through the quantum device.     

一维双链镉(Ⅱ)配合物[Cd(C5H5N)CH2C(OH)(PO3)(PO3H)·3H2O]n的合成与晶体结构

A new cadmium complex [Cd(C₅H₅N)CH₂C(OH)(PO₃)(PO₃H)·3H₂O]_n((C₅H₄N)CH₂C(OH)(PO₃H₂)₂=1-hydroxy-2-(2-pyridyl)ethylidene-1,1-diphosphonate acid) has been synthesized under hydrothermal conditions. Single crystal structure determination reveals that the compound has a ladder-like chain structure in which the edge-shared {CdO₆} octahedra are linked by {CPO₃} tetrahedra through corner-sharing. The chains of {Cd(C₅H₅N)CH₂C(OH)(PO₃)(PO₃H)}_n are linked by inter-chain hydrogen bonds, forming a supramolecular layer. CCDC: 722396.