重离子碰撞复合体系碎化产生超重核可能性的探讨

讨论了通过重核碰撞形成的复合体系破裂产生超重核的问题。评述了两种主要的理论模型:即早期发展的在碎化理论框架下的量子涨落理论和本课题组尝试发展的微观输运理论模型。概括阐述了微观输运理论研究^197Au＋^197Au,^238U＋^238U和^244Pu＋^244Pu等反应的主要结果,即反应中产生的超重碎块的几率与入射能的关系,复合体系和超重碎块的衰变机制以及所形成的超重碎块的结合能和形状的分布。In this paper, the possibility of producing superheavy fragments through composite system breaking up in massive nuclear reactions is investigated. Two main theoretical models, which are the quantum fluctuations with in the fragmentation theory developed at 1980＇s and improved quantum molecular dynamics model developed recently by our group, are briefly reviewed. The dependence of the production probability of superheavy fragments on the incident energy, the decay mechanism of composite system and superheavy fragments, and the distribution of binding energy of Superheavy fragments are discussed for reactions of ^244Pu＋^244Pu, ^238U＋^238U, 197Au＋^197Au based on the improved quantum molecular dynamics model.     

Generation of multi-atom cluster states via an unconventional geometric phase shift in cavity QED

This paper proposes two schemes to generate the multi-atom cluster states. The first scheme is based on the interaction of atoms with a highly detuned cavity mode and a classical field, the second scheme is based on the interaction of atoms with a cavity mode, strongly driven by a resonant classical field.     

高效液相法测定胃康片中呋喃唑酮、甘珀酸钠和盐酸小檗碱

 用高效液相 (HPLC)梯度洗脱法同时测定复方胃康片中呋喃唑酮、甘珀酸钠和盐酸小檗含量。使用No va PakC18柱 ,以乙腈和 0 0 2mol/L磷酸盐缓冲溶液 (pH 7 0 )为流动相 ,3,5 二硝基苯甲酸作为内标溶液 ,使用UV检测器 ,在 2 5 4nm处对样品中上述 3种成分进行测定。测定结果表明 ,呋喃唑酮在 14 1 2mg/L～ 12 70 8mg/L、甘珀酸钠在 10 0 6mg/L～ 90 5 4mg/L、盐酸小檗碱在 99 2mg/L～ 892 8mg/L时其相对峰面积 (标准品与内标的峰面积之比 )与进样质量浓度有良好的线性关系 ,其线性相关系数分别为r =0 9997,r =0 9995和r =0 9991。     

新型保健饮料长寿长乐饮的研制

利用贵州药材资源丰富的优势,开发研制了味美可口、营养丰富的纯中药滋补健身饮料－长寿长乐饮,该饮料含有丰富的营养成分,如多种氨基酸、微量元素、蛋白质、维生素以及活性成分,具有固本培元,强壮身体、调节人体机体平衡,提高人体免疫力、抗疲劳、抗衰老等功效。     

A Sensitive Derivatization Method for the Determination of the Sugar Composition after Pre-column Reductive Amination with 3-Amino-9-ethylcarbazole （AEC） by High-Performance Liquid Chromatography

3-Amino-9-ethylcarbazole （AEC） was employed for monosaccharide derivatization. The derivatives can be analyzed by high-performance liquid chromatography （HPLC） with an ultraviolet detection （wavelength： 254 nm）. Monosaccharides were quantitatively derivatized with 3-amino-9-ethylcarbazole （AEC） at 70 ℃ for 60 min. The method was linear for all samples over the concentration range tested （r〉0.999）, the precision was found to be satisfactory （R.S.D. 〈 3%）, and the recovery ratios were 〉98.62%. The stability analysis showed R.S.D. was between 1.81%-3.16%. Detection limits for the samples （D-glucose, L-xylose, D-mannose, L-arabinose, and L-rhamnose） ranged from 0.06 to 1.97 ng/mL （S/N=3）. Under the optimized derivatization and HPLC conditions, five monosaccharides were well separated using a narrow bore C18 column （250 mm×4.6 mm） with 0.1 mol/L ammonium acetate containing 25% acetonitrile at a flow rate of 0.5 mL/min. As an application, the method has been successfully applied to the determination of monosaccharide compositions of three polysaccharides SPPA-1, SPPB-1 and SPPC- 1 of Spirulina platensis. This method also has potential application to oligosaccharide or glycan analyses.     

超声提取-反相高效液相色谱法测定牛膝中蜕皮甾酮

比较了超声提取与回流提取法在提取牛膝中活性成分蜕皮甾酮的提取效率，在频率为1100kHz时超声提取40min可获得稳定的提取效率。采用Shim-Pack CLC-ODS色谱柱，甲醇：水＝40：60（V／V，％）为流动相，在波长248nm下，测定牛膝中蜕皮甾酮，线性范围为2－200μg/mL（r=0．9998），检出限为0．052μg/mL（S/n=3），加标加收率为98．3％－103％。     

基于纳米金/硫堇层层自组装的新型电流型酶-癌胚抗原免疫传感器

将Nafion 膜固定在金电极(Au)表面, 通过静电吸附和共价键合作用将硫堇(Thi)和纳米金颗粒(nano-Au)层层自组装到Nafion膜修饰的金电极表面. 再通过形成的纳米金单层吸附癌胚抗体(anti-CEA), 最后用辣根过氧化物酶(HRP)代替牛血清白蛋白(BSA)封闭电极上的非特异性吸附位点, 并同时起到放大响应电流信号的作用, 从而制得高灵敏、高稳定电流型酶-癌胚抗原(CEA)免疫传感器. 通过循环伏安和交流阻抗考察了电极表面的电化学特性, 并对该免疫传感器的性能进行了详细的研究. 该传感器对CEA检测的线性范围为2.5~80.0 ng/mL, 检测限为0.90 ng/mL.     

Study on the formation of the composite system of 238U+238U

Strongly damped reactions of ²³⁸U+²³⁸U, at E_cm= 680—1880 MeV have been studied based on the improved quantum molecular dynamics model. We find that at a certain energy region the entrance channel potential is weakly repulsive and the dissipation is very strong after touching configuration, these two effects make the time delay of re-separation for colliding system. The single particle potential well of the transiently formed composite system has Coulomb barrier about 15—20 MeV high at the surface, which makes the excited unbound protons being still embedded in the potential well and moving in a common mono-single particle potential for a period of time and thus restrains from quick decay of the composite system.     

时间模上二阶m-点边值问题的三个正解

运用锥上的不动点定理,讨论时间模上的二阶非线性动力学方程m-点边值问题多个正解的存在性.其中T是一个时间模,ξi∈(0,T)T,0<ξ1<ξ2<…<ξm-2相似文献   

时间模上奇异m-点边值问题正解的存在性

运用Gatica,Oliker和Waltman锥上的不动点定理,在映射是减的条件下讨论时间模上的二阶非线性动力学方程m-点边值问题uΔΔ(t)+f(t,u(t))=0,t∈[0,1]Tu(0)=0,u(1)=∑m-2i=1αiu(ξi)正解的存在性.其中ξi∈(0,1)T,0<ξ1<ξ2<…<ξm-2<1,αi>0,0<∑m-2i=1αi 1.f(t,u)在u=0,t=0,u=∞是奇异的.