浅析新疆经济的各产业发展是否均衡

本文对1990-2012年的新疆生产总值及三产总值数据做了统计分析,建立了新疆地区生产总值与三产生产总值关于年份的指数回归方程,通过对方程进行显著性统计分析,得知第一产业和第三产业发展均衡,但二者均在新疆经济平均发展水平之下,第二产业发展迅速,高于平均水平,占地区生产总值比重较大.若新疆经济的发展模式不变,根据回归方程预计五年后,即2017年新疆地区生产总值达到1.6万亿,一产总值达到0.24万亿,二产总值0.88万亿,三产总值0.54万亿,二产总值达到地区生产总值的一半以上,三者发展极不均衡,出现较大差异.当地政府应该采取相应的措施保持新疆经济的基本平衡.     

基于几何光学的泡沫滴/水滴光散射计算模型

为深入研究舰船泡沫 水两用幕的光衰减机理,建立了基于几何光学的泡沫滴/水滴光散射强度分布计算模型。利用该模型对液相折射率m2为1.20至1.50范围内、气泡相对半径r为0至0.99的球状泡沫滴和水滴、散射角为1至10内的光散射强度进行了数值计算。结果表明,泡沫滴/水滴对可见光具有强烈的散射作用,内的散射强度与入射光强度之比T随的增大而提高,最高可增加2个数量级;随m2的增大而降低,m2从1.30至1.40变化,T降幅最高达11.6%;随r的增加先下降而后提高,达到最低0和最高80.8%;T最低值对应的最优气泡半径ro随m2的降低和的增大而提高,从0.1最多增至0.4。该结论可为舰船泡沫 水两用幕技术的发展提供必要的理论基础。     

用低能电子衍射研究Si(111)7×7表面的原子结构

本文提出了一个由低能电子衍射能带理论计算所确定的Si(111)7×7表面的不等边三角形聚合与添加原子模型。发现:第一层空间距d_k=0.95±0.02?(膨胀21.3%±0.02?),第二层空间距d_l=0.83±0.02?(膨胀5.9%±0.02?),第三层空间距d_l=0.69±0.05?(收缩10.9%±0.08?)和第四层空间距d_b=2.38±0.08?(膨胀3.8%±0.08?)。     

高效液相色谱-电喷雾串联质谱法确证海洋微生物产生的新环肽的连接顺序

报道了采用高效液相色谱一电喷雾串联质谱技术测定由海洋内生真菌产生的2个新环五肽cyelo（Phe-Leu-Leu-Leu-Ile）和cyclo（Phe-Val-Leu-Leu-Leu）,串联质谱实验提供了丰富的结构信息,确证了环肽的氨基酸的种类和连接顺序。这种简单、快速、可靠的分析方法在对未知样品中环肽成分的检测中具有广阔的应用前景。     

N-苯基酰胺中羰基17O-NMR化学位移的研究

按照N-苯基乙酰胺、N-苯基苯甲酰胺、N-苯基邻羟基苯甲酰胺和N-苯基氨基甲酸甲酯四类化合物,提出了一个计算这四类化合物羰基¹⁷O-NMR化学位移的公式：δ_cal=δ_0n+C×(Δ_o+Δ_m+Δ_p),通过线性回归法确定了13种取代基参数,经回归检验表明该公式的置信度为99.5%,与实验值的偏差Δδ在3.0以内的羰基₁₇O-NMR化学位移计算值在95%以上.     

Two-nucleon Excitation from p to sd Shell in 12,14C

The effect of the two-nucleon excitation from p to sd shell is discussed on 12C and 14C in the frame work of the nuclear shell model. The recently suggested shell-model Hamiltonian YSOX provides an suitable tool to investigate the 2 ~! excitation in psd region. Because the strength of the < pp|V |sdsd > interaction, which represents the interaction between the 0 and 2 ~! configurations, is considered in the construction of the Hamiltonian YSOX. The level of 12C is almost independent on the interaction, but excitation energies of certain states in 14C are strongly affected by it. Further investigation shows that the percentage of 2 ~! configuration in these states is quite different from that of the ground state. The non-linear effects of the < pp|V |sdsd > interaction on the configurations and transition rates are also discussed.     

Agglomerated Pd Catalysts and Their Applications in Hydrogen Production from Formic Acid Decomposition at Room Temperature

Agglomerated Pd catalysts with the nano-porous structure were simply prepared by one-step reduction reaction without using any stabilizer. The Pd catalysts show a high catalytic activity for the decomposition of formic acid at room temperature. Among all the Pd catalysts tested, the Pd_Mg catalyst exhibits the highest catalytic activity. Moreover, the breakthrough of the advanced catalysts is that the above agglomerated Pd catalysts can be easily separated from the liquid system to control the catalytic reaction at any time, which may further promote the practical application of formic acid as a H₂ storage material.     

Wakimoto modules for twisted multi-loop algebra of type A1 × A1

We construct a class of modules for the twisted multi-loop algebra of type A1×A1 by applying Wakimoto free bosonic realization. We also discuss the structures and the irreducibility of the Fock space.     

31.02 MHz回旋加速器谐振腔Dee电压的标定

中国科学院近代物理研究所医用重离子加速器(HIMM) 高频系统31.02 MHz回旋加速器谐振腔已完成设计加工和腔体的老炼,并投入正常运行。高频腔体的设计峰值Dee 电压要求达到70 kV,但是Dee 电压准确计算比较困难,可以通过CST 仿真软件对腔体进行模拟得到高频腔体的RP=Q0 值,结合输入到腔体的实际功率,计算出腔体的实际电压值。为了验证Dee 电压的准确性,在相同的腔体输入功率条件下,利用韧致辐射法测量腔体电压,测量结果与计算结果误差在0.6% 以内。The 31.02 MHz cyclotron RF system of Heavy Ion Medical Machine (HIMM) in IMP(Institute of Modern Physics, Chinese Academy of Sciences) has completed the design and commssioning,and now has already been put into operation. Its peak voltage requires 70 kV, but the precise calculation of the Dee voltage is still a difficulty problem, we can get the value Rp/Q0 of the cavity by CST simulation, and then combining the actual input power for cavity to calculate the real Dee voltage. In order to verify its accuracy, we use the bremsstrahlung method to test the cavity voltage under the condition of same input power. The error between test results and calculation is less than 0.6%.     

顶空固相微萃取-全二维气相色谱/飞行时间质谱法分析闽南乌龙茶中的挥发性成分及其在分类中的应用

采用顶空固相微萃取(HS-SPME)结合全二维气相色谱/飞行时间质谱(GC×GC-TOF MS)分析了闽南乌龙茶中的挥发性成分。从48份不同等级和产季的乌龙茶(铁观音、黄金桂、本山、毛蟹和梅占)中获得了2000余种挥发性化合物,经筛选得到51种共有组分,并结合质谱数据库、保留指数与结构谱图等进行了初步鉴定。在此基础上采用主成分分析法(PCA)获得得分投影图,直观给出了不同样品的分类趋势。通过逐步判别获得9种对分类结果有显著影响的组分,并以此为变量通过Fisher判别法(FDA)建立了4个判别函数,对样品的分类准确率达到97.9%。本试验证实了以挥发性成分识别闽南乌龙茶的可行性。