磁约束氦放电及其辐射特性研究

介绍了一种新型气体激光激励结构－磁约束平板放电装置，测量了原子气体氦在这种装置中的放电伏安特性，以及不同条件下氦的放电电流密度和光谱辐射强度，利用该装置，获得了较宽气压范围、大电流密度的稳定直流放电。通过实验，提出了将这种放电结构应用于选择激发，以及应用于发展高功率激光器的设想。     

单原子链中间隙原子引起的局域振动

对含一个间隙原子的单原子链的晶格振动方程进行求解，得到该方程的局域振动频率的解析解，并讨论了不同局域振动频率的链振动。     

Anion-exchangeable inorganic-organic hybrid materials synthesized without using templates

Inorganic-organic hybrid materials have been obtained at room temperature in aqueous solution without using the templates of surfactants. The materials are carefully characterized by anion-exchange measurement, elements analysis, X-ray diffraction, and infrared spectroscopy. Notably, the anion-exchange capacity of the samples (3.9mmol.g^-1) is even higher than anion-exchangeable resins. Interestingly, both small and large anions could be easily exchanged into the samples due to the plasticity of the samples, along with the phase transition.     

Permeation study of the potassium channel from streptomyces Lividans

A three-state hopping model is established according to experiments to study permeation of an open-state potassium channel from Streptomyces Lividans (KcsA potassium channel). The master equations are used to characterize the dynamics of the system. In this model, ion conduction involves transitions of three states, with one three-ion state and two two-ion states in the selectivity filter respectively. In equilibrium, the well-known Nernst equation is deduced. It is further shown that the current follows Michaelis-Menten kinetics in steady state. According to the parameters provided by Nelson, the current-voltage relationship is proved to be ohmic and the current-concentration relationship is also obtained reasonably. Additional validation of the model in the characteristic time to reach the steady state for the potassium channel is also discussed. This model lays a possible physical basis for the permeation of ion channel, and opens an avenue for further research.     

Pneumatic active suspension system for a one-wheel car model using fuzzy reasoning and a disturbance observer

This paper presents the construction of a pneumatic active suspension system for a one-wheel car model using fuzzy reasoning and a disturbance observer. The one-wheel car model can be approximately described as a nonlinear two degrees of freedom system subject to excitation from a road profile. The active control is composed of fuzzy and disturbance controls, and functions by actuating a pneumatic actuator. A phase lead-lag compensator is inserted to counter the performance degradation due to the delay of the pneumatic actuator. The experimental result indicates that the proposed active suspension improves much the vibration suppression of the car model.     

Improved production of spiramycin by mutant Streptomyces ambofaciens

Strain improvement and medium optimization to increase the productivity of spiramycin were carried out. Of oil tolerant mutant strains screened, one mutant, Streptomyces ambofaciens XC 2-37, produced 9% more spiramycin than the parent strain S. ambofaciens XC 1-29. The effects of soybean oil and propyl alcohol on spiramycin production with S.ambofaciens XC 2-37 were studied. The potency orS. ambofaciens XC 2-37 was improved by 61.8% with addition of 2% soybean oil in the fermentation medium and 0.4% propyl alcohol at 24 hours after incubation. The suitable time for feeding propyl alcohol is at 24 hours after incubation in flask fermentation and at 20 hours after incubation in fermentor fermentation The new process with S. ambofaciens XC 2-37 was scaled up for industrial scale production of spiramycin in a 60 m^3 fermentor in Xinchang Pharmaceutical Factory, Zhejiang Medicine Company, Ltd., China, and the potency and productivity of fermentation were improved by 42.9%.     

水上交通观测天数与交通量估计精度的关系

利用数理统计与概率论的有关理论,在定义了以置信区间的长度与船舶交通量日均估计值之比作为"相对误差"的基础上,得到了船舶交通量观测时间与精度关系的有关结论.该结论可作为港口规划、实施船舶定线制及确定无线电岸台交换机容量决策的参考依据.     

Dynamic balancing of dual-rotor system with very little rotating speed difference

Unbalanced vibration in dual-rotor rotating machinery was studied with numerical simulations and experiments. A new method is proposed to separate vibration signals of inner and outer rotors for a system with very little difference in rotating speeds. Magnitudes and phase values of unbalance defects can be obtained directly by sampling the vibration signal synchronized with reference signal. The balancing process is completed by the reciprocity influence coefficients of inner and outer rotors method. Results showed the advantage of such method for a dual-rotor system as compared with conventional balancing.     

A novel long-chain acyl-derivative of epigallocatechin-3-O-gallate prepared and purified from green tea polyphenols

Lipophilic tea polyphenols (LTP) were prepared by catalytic esterifieation of green tea polyphenols (GRIP) with hexadeeanoyl chloride. A novel long-chain aeyl-derivative of epigalloeateehin-3-o-gallate(EGCG) was first isolated from purification of LTP by high-speed eountereurrent ehromatography (HSCCC)using a solvent system composed of n-hexane-ethyl acetate-methanol-water ( 1 : 1 : 1 : 1, v/v) . The moleeularstructure of the acyl-derivative, Epigallocatechin-3-O-gallate-4‘-O-hexadeeanate , was elucidated by meansof elemental analysis, IR, 1H-NMR and MS spectra.     

一种小额支付协议的研究与设计

分析了PayWord这种小额支付协议,针对PayWord的一些关于交易原子性的局限性,提出了一种新的支付协议--CertWord,此协议沿用PayWord协议的Payword链来表示货币,充分利用交易证书对交易信息进行签名,并记录交易步骤的状态,从流程上保证交易的原子性。