半群OI_n(k,m)的秩

设OI_n是[n]上的保序严格部分一一变换半群.对任意1≤k≤n-1,且2≤m≤n,研究半群OI_n(k,m)={α∈OI_n:(x,y∈dom(α))x≤k■xα≤k,y≥m■yα≥m}的秩,证明半群OI_n(k,k+1)的秩为n,且半群OI_n(k,m)(m≠k+1)的秩为n+2.     

直接加热处理法生产牛血清白蛋白的工艺研究

报道了一种直接加热制备牛血清白蛋白的新方法,该方法的白蛋白收率可达55%以上,纯度可达95%以上,是一种适合于大规模生产的工艺技术;主要研究了溶液pH值、加热温度、保温时间和稀释倍数等因素对白蛋白的收率和质量的影响.     

Universal Quantum Fluctuations and Crossover Phenomena in Tunnelling Through Small Coulomb Islands

Tunnelling through small Coulomb islands is studied in the intermediate coupling regime based on a generalized multi-level Anderson-Wolff model.It is shown that conductance and magnetization as a function of voltage exhibit a type of universal quantum fluctuation.We predict new crossover from the Coulomb blockade oscillations to the universal conductance fluctuations,and the Coulomb blockade oscillation assisted Kondo peaks.     

Dynamics of Analytical Matter-Wave Solutions in Three-Dimensional Bose–Einstein Condensates with Two- and Three-Body Interactions

Using the F-expansion method we present analytical matter-wave solutions to Bose-Einstein condensates with two- and three-body interactions through the generalized three-dimensional Gross-Pitaevskii equation with time- dependent coefficients, for the periodically time-varying interactions and quadratic potential strength. Such solutions exist under certain conditions, and impose constraints on the functions describing potential strength, nonlinearities, and gain （loss）. Various shapes of analytical matter-wave solutions which have important applications of physical interest are s~udied in details.     

色散补偿光纤通信系统中孤子之间的相互作用

采用变分原理与位力定理研究了非线性光通信系统色散补偿方案中,相邻孤子之间的相互作用对孤子传输特性的影响。结果表明:在相位匹配与等幅孤子注入时,在普通单模光纤中这两个孤子先相互吸引,而后又相互排斥,显现周期性碰撞的变化规律,形成束缚孤子态,而在色散补偿光纤中传输的孤子之间不发生碰撞;对相位不匹配与等幅孤子注入,孤子之间发生分离;对相位匹配和不等幅孤子注入,在色散补偿光纤中传输的孤子,如果初始间隔φ0越小,应注入较大的初始幅值差η0,以利于孤子的传输。     

攀枝花市建设南亚热带地方特色植物园初探

通过对攀枝花城市气候优势、植物资源优势、社会经济状况、城市发展前景与现有建设基础的分析，结合对国内相关城市植物园的特色研究，得出在攀枝花建设富有地方特色的综合性植物园是现实可行。其特色应突出攀枝花南亚热带干热河谷地带植物的地方特色。在植物品种上以苏铁等攀西特色植物为主；在功能上力求实现其科研、科普，旅游和园林绿化生产经营的综合性。     

电-声系统中的费密超导态

基于推广的电－声相互作用模型,考虑到电子的强关联作用,提出了电子算符的玻戈留玻夫近似,导出了声子在电子场中受到的有效作用;证明了波矢相反的纵声子通过交换虚电子能产生一个有效的吸引力,从而构成带有一个电子的声子对。在适当的声子数密度下,形成稳定的费密高温超导态。     

Heat Conductivity in a Two-Dimensional Finite-Size Spin System with Dzyaloshinskii-Moriya Interactions

Heat conductivity is studied by direct numerical simulations in a two-dimensional model with chiral Dzyaloshinskii-Moriya （DM） spin superexchange interactions for various DM strengths and finite sizes. We find that when temperature is not too low, the thermal conductivity can be well described in the semi-classical spin wave picture, and connections of thermal conductivity with the specific heat and the dynamic relaxation time are verified to be suitable. In particular, the transition arising in Sr14-xCaxCu24O41 is related to a magnetic spin glass and qualitatively understood as a kind of Kosterlitz-Thouless transitions. It is shown that the critical temperature is linearly dependent on the spin-spin interactions for the relevant strong DM strength.     

乙酰丙酮与芳香胺单Schiff碱的合成

用分水器分水与苯或甲苯恒沸脱水相结合的方法,以浓盐酸或对甲苯磺酸作催化剂,系统地研究了乙酰丙酮与芳香胺单Schiff碱的合成;制备出六个相应的Schiff碱,产率高达60%～87%.