基于Flash交互动画技术的西湖传统文化保护系统

西湖传统文化保护系统属于非物质文化数字保护的范畴.在非物质文化数字化保护的框架下,以西湖传统文化内容为范例,探讨和建立了以Flash开发平台的Action Script 3.0为基础、交互动画形式为主的多维度交互式展示系统,重点解决基于Flash Action Script 3.0语言为基础的内在技术,尝试以模拟触控平台、无缝链接交互结构及自由信息交互操控三大交互结构设计来实现交互现实体验,从而验证了在数字化媒体艺术中Flash交互动画技术传播传统文化的优势和有效性.     

Photoinduced Oxidation Reaction of Benzotrifluoride with OH Radical by the Laser Flash Method

The optical transient and kinetics characterizations of the transients formed in the reaction of OH with benzotrifluoride (BTF) were performed by a laser flash photolysis technique. The results indicated that the formation of π‐type adduct of C₆H₅(OH)CF₃ was the major reaction channel, and the δ‐type adduct of C₆H₅CF₃OH formation was an additional minor process in the oxidation reaction of BTF attacked by OH radicals yielded from the photolysis of H₂O₂. Addition of OH to the CF₃ group led to the fluoride ion elimination to yield α,α‐difluorophenylcarbinol (C₆H₅CF₂OH). Trifluoromethylphenol (HOC₆H₄CF₃) of meta‐, para‐ and ortho‐substituted isomers resulted from the addition of OH to the BTF aromatic ring.     

Intermolecular vs. intramolecular photoinduced electron transfer from nucleotides in DNA to acridinium ion derivatives in relation with DNA cleavage

Photoirradiation of various 10-methylacridinium ions (AcrR⁺, R = H, ⁱPr, and Ph) intercalated in DNA results in ultrafast intramolecular electron transfer, followed by rapid back electron transfer between AcrR⁺ and nucleotides in DNA. The electron-transfer dynamics in DNA were monitored by femtosecond time-resolved transient absorption spectroscopy. Both acridinyl radical and nucleotide radical cations, formed in the photoinduced electron transfer in DNA, were successfully detected in an aqueous solution. These transient absorption spectra were assigned by the comparison with those of DNA nucleotide radical cations, which were obtained by the intermolecular electron-transfer oxidation of nucleotides with the electron-transfer state of 9-mesityl-10-methylacridinium ion (Acr–Mes⁺) produced upon photoexcitation of Acr⁺–Mes. Photoinduced cleavage of DNA with various acridinium ions (AcrR⁺, R = H, ⁱPr, Ph, and Mes) has also been examined by agarose gel electrophoresis, which indicates that the rapid intramolecular back electron transfer between acridinyl radical and nucleotide radical cation in DNA suppresses the DNA cleavage as compared with the intermolecular electron-transfer oxidation of nucleotides with Acr–Mes⁺.     

Self‐initiation of the UV photopolymerization of brominated acrylates

Brominated aromatic acrylates were found to polymerize rapidly upon exposure to UV light. Moreover, they are able to initiate the UV‐induced polymerization of acrylic formulations that do not contain a conventional photoinitiator. In contrast, the corresponding unbrominated homologues are not effective as initiators. Investigations by real‐time FTIR spectroscopy have shown that the addition of only 1 wt % of a brominated acrylate is sufficient for an efficient initiation. Fast photopolymerization is achieved even if irradiation is carried out at λ > 300 nm where most acrylates do not absorb. Short‐lived transients were studied by laser flash photolysis. The triplet was found to show low sensitivity to oxygen which is because of its very short lifetime. Bromine radicals split of from the acrylates were trapped with bromine ions from tetraethyl ammonium bromide and detected as Br. The resulting quantum yields for the formation of bromine radicals are in the range of up to 0.3. Quantum chemical modeling was carried out to establish a mechanism for the release of bromine radicals. Both bromine and bromophenyl radicals are able to initiate the polymerization reaction. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 4905–4916, 2008     

排球发射机的研究及其设计

本文根据目前排球运动训练器材发展的动态和趋势,重点研究了发球训练的规律及其手段,并在此基础上,研究和设计出“排球发射机”。     

Intramolecular photoinduced electron transfer in Pd-porphyrin-quinone in the picosecond time range

Photoinduced electron transfer (PET) was studied in toluene solutions of the Pd-porphyrin-quinone (Pd-PQ) dyad by flash photolysis in the picosecond time range and by a luminescence method. It is found that Pd-PQ has a high rate of intercombination conversion K_isc=(7.7±0.2)·10¹⁰ sec⁻¹. Competing intramolecular PET occurs from the lower excited singlet state of the dyad with the rate constant K _et ^s =(2.7 ±0.3)·10¹⁰ sec⁻¹. Therefore, ∼74% of excited molecules from the dyad make a transition to the triplet T₁ state and 26% take part in intramolecular PET resulting in formation of radical products. The radical products relax to the ground state with the rate constant K=(7.4±0.2)·10⁹ sec⁻¹. Institute of Molecular and Atomic Physics of the National Academy of Sciences of Belarus, 70, F. Skorina St., Minsk, 220072, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 1, pp. 11–18, January–February, 1999.     

酪氨酸光电离过程的激光闪光光谱研究:pH效应

运用２４８ｎｍ激光闪光光解瞬态吸收光谱研究了不同ｐＨ值水溶液中酪氨酸光解过程,结果表明,溶液ｐＨ值影响酪氨酸的光电离过程;ｐＨ值增大,通过单光子途径的分子增多,而通过双光子途径的分子减少,反之则反。进一步阐明,酪氨酸光电离的ｐＨ效应源于其酚羟基的电离。     

嵌入式系统中Flash存储管理策略

Flash存储器因其体积小、容量大、成本低、掉电数据不丢失等一系列优点,成为嵌入式系统中主要数据和程序载体。然而,由于Flash读写存储的编程特点,有必要对其进行存储过程管理．以使其数据存储性能得以改善。本文以TRI公司的基于NOR Flash的Flash管理软件FMM为例,详细介绍嵌入式系统中如何根据Flash的物理特性来进行Flash存储管理,并在此基础上对其数据存储方法进行了改进。     

一种带有酯基并键合电子给体的新型Ru(bpy)3的设计、合成及光谱和电化学性能

设计、合成了一种新型Ru(bpy)3类的光敏染料,利用ESL-MS和1D,2D-NMR(gCOSY,HSQC和HMBC)对化合物的结构进行了鉴定,并通过UV-vis、荧光光谱、闪光光解及电化学对其光谱和氧化还原特性进行了研究．结果表明：四个酯基及给电子配体的引入,改变了配合物的光谱特性和氧化还原电位,使其蚴带的最大吸收波长与[Ru(bpy)3]^2 相比发生了红移,拓宽了光谱的吸收范围,提高了对太阳能的利用效率;^3MLCT激发态寿命长,有利于发生分子内电子转移;在较宽的电位范围内具有很好的氧化-还原可逆性,且氧化电位Ru^3 ／Ru^2 与[Ru(bpy)3]^2 相比提高了～360mV,增强了电子传递的驱动力,说明该染料是一种潜在的太阳能电池的光敏剂．     

视觉诱发电位提取中闪光刺激的PWM实现

视觉诱发电位提取过程中,可以通过闪光刺激获得诱发脑电信号．实验发现,闪光刺激的脉宽、频率和闪光刺激次数对于视觉诱发电位的提取具有关键作用．针对视觉诱发电位的提取特点及其相关因素,探讨了基于脉宽调制（PWM）技术的闪光刺激方法,研究了PWM的软硬件实现方法,同时利用专用集成芯片实现了精确的PWM输出,从而可以根据视觉诱发电位提取过程中的具体条件调整闪光刺激的参数,实现视觉诱发电位的有效提取．实验结果表明利用PWM的精确提取方法控制闪光刺激的发生,对于闪光视觉诱发电位的有效提取具有较好的效果．