光促进温和条件非贵金属催化下卤代烃与二氧化碳的羰基化反应及ESR谱研究

研究了卤代烃在光促进温和条件（常温常压）非贵金属[Co(acac)₂,Co(OAc)₂或CoCl₂]催化下与二氧化碳的羰基化反应；同时对反应过程中的ESR谱进行了研究. ESR谱研究表明，在光促进下二氧化碳参与的羰基化反应中有二氧化碳游离基负离子（CO^·-₂）[用DMPO（5,5-二甲基-1-吡咯啉-N-氧化物）捕获］生成.     

PRODUCTION OF LIGHT ALKENES FROM SYNGAS OVER Fe-MnO CATALYST SUPPORTED ON IIA METAL OXIDE

The alkene selectivity of CO hvdrogenation over Fe-MnO catalystis improved obviously by using NA metal oxide as catalyst support.Bettercatalytic pertformance of catalyst Fe-MnO/MgO can be achieved withaddition of LA metal as promoter.The selectivity is insensitive totemperature.but not to syngas space velocity.Two kinds of coking(I and Ⅱ)will form over the catalyst during CO hydrogenation.lt is interesting thatcoking(I)is favorable for production of light alkenes while cokiing(lI)is not.Other more.LA metal oxide supported Fe-MnO catalyst is able to inhibit thesecondary reactions of ethylene and hydrogenation of propylene.which isfavorable for the formation of light alkenes.     

二级轻气炮超高速弹丸发射技术的研究

 本文研究了提高二级轻气炮弹丸速度的发射技术途径。通过数值计算对各种装填参量的影响进行了详细讨论。认为减小弹丸质量、活塞质量以及注气压力，可使二级轻气炮在较少的装药量条件下提供较高的弹丸速度。目前已经做到在5 kg装药时，使30 g的弹丸达到7.2 km/s速度；60 g弹丸达到5.7 km/s速度；26 g弹丸达到7.4 km/s速度。装填3.5 kg药量时，使10.3 g弹丸达到了8.1 km/s速度。     

Complexes of lysozyme with sodium (sulfamate‐carboxylate)isoprene/ethylene oxide double hydrophilic block copolymers

Complexes between sodium (sulfamate‐carboxylate)isoprene/ethylene oxide double hydrophilic block copolymers and lysozyme, a globular protein, were formed in aqueous solutions, at pH 7, because of electrostatic interactions between the anionic groups of the polyelectrolyte block of the copolymers and the cationic groups of lysozyme. The structure of the complexes was investigated as a function of the anionic/cationic charge ratio of the two components in solution and ionic strength by static, dynamic, and electrophoretic light scattering, atomic force microscopy, and fluorescence spectroscopy. The mass and size of the micellar‐like complexes depend on the mixing ratio and the molecular characteristics (molecular weight, composition, and architecture) of the copolymer used. Complexation persists at 0.15M NaCl, the value for physiological saline, as a result of additional hydrophobic interactions between the copolymers and the enzyme. Fluorescence spectroscopy measurements indicate that the secondary structure of lysozyme does not change substantially after complex formation. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 509–520, 2007     

Highly efficient and well‐controlled ambient temperature RAFT polymerization of glycidyl methacrylate under visible light radiation

A range of well‐defined poly(glycidyl methacrylate) (PGMA) polymers and their corresponding block copolymers were synthesized via 2‐cyanoprop‐2‐yl(4‐fluoro) dithiobenzoate or CPFDB‐mediated ambient temperature reversible addition fragmentation chain transfer radical polymerization or RAFT polymerization under environmentally friendly visible light radiation (λ = 405–577 nm), using a (2,4,6‐trimethylbenzoyl) diphenylphosphine oxide photoinitiator. As comparison, CPFDB‐mediated ambient temperature RAFT polymerizations of glycidyl methacrylate (GMA) under both full‐wave radiation (λ = 254–577 nm) and long‐wave radiation (λ = 365–577 nm) were also studied in this article. The results indicated that CPFDB moieties were significantly photolyzed under either full‐wave radiation or long‐wave radiation, thus undermining the controlled behavior of these RAFT processes. Whereas this photolysis was significantly suppressed under visible light radiation, thus CPFDB functionalities exerted well control over RAFT process, leading to a remarkably living behavior up to 90% GMA monomer conversions. This strategy facilitates the facile synthesis of well‐defined PGMA polymers. More importantly, under visible light radiation, a relatively high initial molar ratio of GMA to CPFDB and TPO led to shortening initialization period of RAFT process and accelerating overall polymerization rate. These effects are remarkably in favor of the facile synthesis of well‐defined PGMA polymers and PGMA‐based copolymers with high molecular weights. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 5091–5102, 2007     

用蓝色光二极管测量掺钛蓝宝石飞秒激光脉冲宽度

用蓝色光二极管双光子跃迁光电流信号测量掺钛蓝玉石飞秒激光脉冲宽度，实验高精度地记录了二阶干涉自相关曲线及其精细结构，由于用蓝色二极管双光子跃迁代替了常用的二次谐波，而且光信号直接转化为电信号，从而使飞秒激光脉冲宽度的测量大为简化。     

高阻恒流LED产生亚泊松光的理论研究

本文研究高阻恒流源驱动的光发射二极管（ＬＥＤ）的输出光场的振幅噪声压缩与电，光量子效率，漏电流效应，泵浦残余噪声频率的关系，指出高阻恒流技术不仅使任意纵模产生振幅噪声压缩，而且由于仅在高阻恒流下各纵模间存在负量子相关，使得ＬＥＤ总输出光场的振幅噪声压缩加深。     

Fluorine absorption in dental enamel assisted by UV irradiation

Summary A new method of dental fluorine prophylaxis based on the chemical reaction induced by UV irradiation in dental enamel has been presented. Fluorine ions from a gel topic can be retained to the dental apatite in the lamp-irradiated samples at about 70% and in the laser-irradiated samples at about 80% of the maximum deposited value. The¹⁹F(p,α)¹⁶O nuclear reaction was used to measure the fluorine concentrations in the first 3 μm of the enamel of healthy teeth before and after the gel topic applications with and without UV irradiation. This method of dental prefenction resolves the problem of the traditional fluorine prophylaxis which brings fluorine in the enamel without binding the apatite. To speed up publication, the authors of this paper have agreed to not receive the proofs for correction.     

GeSi合金1×4Y级联分束器的有限差分束传播法模拟设计

进一步研究二个问题：（１）理论模拟的方法由快速傅里叶束传播法（ＦＦＴ－ＢＰＭ）改为有限差分束传播法（ＦＤ－ＢＰＭ），并比较了两者的优缺点。（２）模拟设计了对象提高为由ＧｅＳｉ合金单模脊形光波导组成的Ｙ级联１×４光分束器。结果表明，有限差分束传播法比快速傅里叶束传播法及显形有限差分束传播法（ＥＦＤ－ＢＰＭ），除了数学比较容易外，计算速度也快一些。尤其是对传播步长Δｚ的敏感性，有限差分束传播法远没有快速傅里叶束传播法那样严重，便利了束传播法方法的采用。正如束传播法成功地应用于ＧｅＳｉ合金光波导及Ｙ分支器的理论设计，现在用了１×４Ｙ级联分束器同样得到预想的结果。光束在分束器中传播逐步分成二束再分为四束。符合设计要求。     

Visible light emission in collisions between O5+ ions and He atoms

Visible light emission spectra during collisions between O⁵⁺ ions and He atoms in the range of 200–800 nm at different projectile energies (4.06–5.31 keV-u⁻¹) have been measured. Emission spectra show that there are three channels of excitation in the O⁵⁺-He collision system: (i) single-electron capture into excited states; (ii) double-electron capture into excited states; (iii) direct excitation of target atoms. There are transitions between states with comparably high quantum numbersnl. The absolute emission cross-sections of every spectral line are calculated. The relations of these cross-sections with the energy of the projectiles are studied. Project supported by the National Natural Science Foundation of China and Chinese Association for Atomic and Molecular Dada.