大视场红外导引头光学系统消热差设计

为消除温度变化对共形光学导引头像质的影响,利用光学被动消热差理论对具体设计方法进行实际分析.根据消热差条件选择合理的透镜材料组合,利用衍射元件特殊的光热特性采用折/衍混合结构进行消热差设计.采用椭球形共形整流罩结构减小空气阻力,降低导弹头部气动加热效应,利用三片式反远距结构实现短焦大视场系统设计.该系统工作波段为3～5 μm,系统F/#为2,视场角为±90°；凝视结构的导引头光学系统后工作距达22.8 mm,为制冷型探测器留有足够的空间；冷光阑效率为100％；在-40℃～60℃温度变化范围内,15 lp/mm处全视场MTF值均大于0.4,满足高准确度定位导引头系统对成像质量的要求,保证了系统的轻小型设计.     

光干涉现象的演示

采用传统方法演示孔(双孔、三孔)和缝(双缝、三缝)的干涉图像,与由传感器采集图像信息后由计算机得出干涉光强分布曲线进行比较,两种方法获得的实验图像符合较好.     

Vector meson rescattering effect in understanding the threshold enhancement observed in J/ψ→γp(p)

We propose one possible mechanism,i.e.,the vector meson(VV)rescattering effects,to interpret the near threshold narrow enhancement observed in J/ψ→γp(p).The estimate indicates that these effects can give sizeable contributions to this channel,and a destructive interference between different rescattering amplitudes is required to reproduce the line shape of the data.     

基于NiosⅡ的OLED显示驱动技术研究

为了利用有机发光二极管(OLED)显示屏显示字符及图形,对基于Nios技术的OLED显示驱动进行了研究。利用FPGA开发环境编写SVGA时序的Verilog HDL程序,设计了适合EMA-100080型SVGA+主动矩阵OLED微型OLED显示屏的SVGA接口;利用Nios集成开发环境编写C语言程序/控制字符、图形的生成及传输,协调NiosⅡ和FPGA之间数据传输。经调试及验证,表明OLED屏能够显示特定的字符及图形。     

Hydrothermal Synthesis of Two 3D Lanthanide(Ⅲ) Organometallic Polymers in the 3,5-Pyridinedicarboxylate System with Different Coordination Architecture

Two coordination polymers of lanthanide complexes [(Dy)2(3,5-PDA)3(H2O)2]n 1 and [(Pr)2(3,5-PDA)3(H2O)3]n 2 (3,5-PDA = pyridine-3,5-dicarboxylate) have been synthesized under hydrothermal conditions. The prepared compounds were characterized by elemental analysis, IR and TG analyses and single-crystal X-ray structure determination. Complex 1 crystallizes in monoclinic, space group C2/c with a = 14.104(2), b = 11.1129(16), c = 15.086(2) , β =92.138(2)o, V = 2362.8(6) 3, Z = 4, C21H13Dy2N3O14, Mr = 856.34, Dc = 2.407 g·cm-3, F(000) = 1616, μ(MoKα) = 6.359 mm-1, the final R = 0.0422 and wR = 0.1016 for 2000 observed reflections with I 2σ(I). Complex 2 crystallizes in triclinic, space group P1 with a = 8.9441(13), b = 9.3959(14), c = 14.625(2), α = 98.065(2), β = 95.481(2), γ = 104.9130(10)o, V = 1164.7(3) 3, Z = 2, C21H15Pr2N3O15, Mr = 831.18, Dc = 2.370 g·cm-3, F(000) = 800, μ(MoKα) = 4.224 mm-1, the final R = 0.0355 and wR = 0.0731 for 4092 observed reflections with I 2σ(I). These polymers are constructed from the 3,5-PDA ligand but they exhibit different kinds of metal-organic framework structures. Complexes 1 and 2 are constructed from M-C-O zigzag corner-linked chains (M = Dy and Pr). In 1, the chains are composed of 8-coordinated DyIII centers, while the chains are made up of 8- and 9-coordinated PrIII centers in complex 2. These chains are cross-linked to each other by the pyridine rings of 3,5-PDA ligands, generating three-dimensional architectures. The magnetic behavior of compound 1 has been investigated, showing it exhibits antiferromagnetic interactions among the DyIII ions.a (Tianjin Key Laboratory of Structure and Performance for Functional Molecule, College of Chemistry and Life Science, Tianjin Normal University, Tianjin 300387, China) b (State Key Laboratory of Element-organic Chemistry, Nankai University, Tianjin 300071, China)     

Phenolic Components from Rhododendron latoucheae Part 5 in the series "Chemical Studies on Ericaceae Plants

Chemicalc0mponentsofthegenusRhododendronwithvariousbioactivities,suchasantitussiveandantitracheitishavebeenidentifiedbefore'.T0thebestofourkn0wledge,theplantRhododendronlatoucheaeFinetetFranchofthegenushasnotbeenstudiedchemicallyupt0n0w.Wehereinrep0rtthestructuraIelucidationoftw0newnaturalphen0licc0mpoundsnamed( )-rhodolat0uchollandisoepirh0d0dendrin4fromtheleavesofR.laloucheae.Besides,sixotherknownc0mpounds,( )-rh0d0dendr0l2,epirh0d0dendrin3.4-(3'-O-0-D-glucopyranosyl-4'-hy5,4-(4'-O-6-D-g…     

Preparation of Starch Succinate WITH INTERMEDIATE DS BY AQUEOUS SLURRY REACTION

Modification of starch by chemical derivatization has been widely studied since early 1950s. The formation of starch ester such as acetate and propionate imparts starch water resistance. In contrast, the introduction of carboxylates onto starch increases the hydrophilicity of starch. One example is carboxymethyl starch (CMC), which has been widely used in several industry areas. Succinic anhydride reacts with starch to form starch succinates. Since starch succinates are polyanions, they off…     

Electron Spin Resonance(ESR)Spectroscopy of the Transition-metal Complexes and Clusters I.Systematic Investigations of Real-and Complex-Orbital Methods for Calculating the d-Orbital Energies of a Low-spin(S=1/2)nd~5(t_2~5,~2T_2)(n=3

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃａｌｃｕｌａｔｉｏｎｓｉｎｔｈｅｆｉｒｓｔｐａｐｅｒｓｈｏｗｅｄｔｈａｔｒｅａｌ ａｎｄｃｏｍｐｌｅｘ ｏｒｂｉｔａｌｍｅｔｈｏｄｓｄｅｒｉｖｅｄｆｒｏｍａｍｏｄｅｌｏｆｅｌｅｃｔｒｏｎｉｃ ｉｎｔｅｒｓｕｐｐｌｅｍ...     

5-(5-氯-2-吡啶偶氮)-2,4-二氨基甲苯分光光度法测定微量钌(Ⅲ)

研究了 5- ( 5-氯 - 2 -吡啶偶氮 ) - 2 .4-二氨基甲苯 ( 5- Cl- PADAT)与钌 ( )的显色反应。在 p H4.0～ 6.5HAc- Na Ac缓冲溶液中 ,在加热的条件下 ,5- Cl-PADAT与 Ru( )形成稳定的配合物 ,加入无机酸 ( HCl,HCl O4 ,H2 SO4 ,H3 PO4 )酸化后 ,其最大吸收波长位于 50 5nm处 ,表观摩尔吸光系数为 8.5×1 0 4 L· mol-1· cm-1,钌浓度在 0～ 6μg/ 1 0 m L范围内服从比耳定律 ,Ru( )与 5- Cl- PADAT配合物的摩尔比为 1∶ 2。以 EDTA为掩蔽剂 ,方法具有良好的选择性 ,已应用于合成样中钌的测定。     

A Novel Synthesis of Methyl 4, 6-O-Benzylidene-α-D-Glucopyranoside 2, 3-Cyclic Phosphite Ethyl Ester

Itiswellknownthatnearlyallthebiochemicalmetabolicprocessesofcarbohydratesinlivingorganismsinvolvetheparticipationofphosphorus.Forexample.glycosylphosphatesareofgreatsignificanceforthebiologicalactivityofglycoconjugatesandcanserveasintermediatesinbiologicalglycosyltransfer.Theyarealsoofgreatimportanceasglycosyldonorsinpreparationofoligosaccharides,whichareconstituentsofbiologicallyimportantcompoundssuchasantibiotics,glycolipids,glycoproteins.andimmunodeterminants'.Hencetheinvestigationofphospho…