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The Use of Large Magnetic Fields to Probe Photoinduced Electron Transfer Reactions:An Example from Photosynthetic Reaction Centers
Large Magnetic Fields Photoinduced Electron Transfer Reactions Photosynthetic Reaction Centers
2016/5/20
We will outline an experimental approach that uses large magnetic fields and simple optical methods, combined with a method of data analysis, that is ideally suited for studying the mechanism of rapid...
Synthesis and Spectroscopic Properties of a Novel Cofacial Chlorophyll-Based Dimer
Synthesis Spectroscopic Properties Cofacial Chlorophyll-Based Dimer
2016/5/20
We wish to report the synthesis and unique spectroscopic properties of a novel, doubly linked, cofacial chlorophyll (Chl) dimer. Considerable effort has been directed toward the synthesis and characte...
Preparation and Properties of a Chlorophyllide-Apomyoglobin Complex
Preparation Properties Chlorophyllide-Apomyoglobin Complex
2016/5/20
The spectroscopy of large molecules like chlorophyll poses a number of problems because it is difficult to obtain a transparent host matrix for single-crystal optical and magnetic resonance investigat...
Nuclear Magnetic Resonance of Photoexcited Triplet States. I. The Measurement of the Rate of Degenerate Singlet-Triplet Exchange for Anthracene in Solution
Nuclear Magnetic Resonance Photoexcited Triplet States Measurement Degenerate Singlet-Triplet Exchange for Anthracene
2016/5/20
The N M R spectroscopy of molecules undergoing rapid exchange between diamagnetic and paramagnetic environments is well understood and is exemplified in studies of fast electron transfer between an or...
"The Effect of Magnesium Coordination on the 13C and 15N Magnetic Resonance Spectra of Chlorophyll a.The Relative Energies of Nitrogen np States as Deduced from a Complete Assignment of Chemical Shifts"
Magnesium Coordination 13C and 15N Magnetic Resonance Spectra Nitrogen np States Complete Assignment Chemical Shifts
2016/5/20
The 5 5 13Cand 4 I5Nnmr transitions in chlorophyll a and its magnesium-free derivative pheophytin a have been assigned. Emphasis is placed on the quaternary carbon atoms of the macrocycle which carry ...
四氟硼酸改性活性炭的制备及其吸附脱除二苯并噻吩性能
吸附脱硫 改性活性炭 四氟硼酸 二苯并噻吩
2015/5/27
采用浸渍法制备了四氟硼酸(HBF4)改性活性炭,并研究了其对模拟油中二苯并噻吩(DBT)的吸附脱除性能。利用傅里叶红外光谱(FT-IR)、差示热分析仪(TG-DTA)、X射线光电子能谱(XPS)以及N2吸附技术对吸附剂的表面态和孔结构进行了表征,考察了四氟硼酸浓度、热处理温度以及模拟油中DBT浓度对吸附脱硫效果的影响。结果表明,经质量分数0.5%的HBF4溶液浸渍、140 ℃热处理后,在剂油比1:...
用大气压下火花放电方法和发射光谱原位诊断技术, 对CH4直接转化制乙炔和间接转化制合成气进行了研究, 并与介质阻挡放电进行了比较。结果表明, 火花放电具有能量效率高的突出优点, 能够高效地将CH4活化成C原子、H原子和C2等活泼物种。当CH4单独进料时, 能得到以C2H2为主的烃类产物。当CH4与CO2和O2共进料时, 能得到H2/CO比值可调的合成气产物。在用火花放电转化CH4和CO2制合成气时...
REGISTRATION OF OPTICAL DATA WITH HIGH-RESOLUTION SAR DATA: A NEW IMAGE REGISTRATION SOLUTION
Image Registration Multisensor Optical Data SAR TerraSAR-X Pléiades-1a, Automation HyPARE Algorithm
2014/4/24
Accurate image-to-image registration is critical for many image processing workflows, including georeferencing, change detection, data fusion, image mosaicking, DEM extraction and 3D modeling. Users n...
阳光晒退对泥石流表层物质热释光信号的影响
等效剂量 热释光 泥石流 阳光晒退
2013/4/19
应用热释光技术对模拟阳光晒退后的泥石流标样和实际阳光晒退后的泥石流样品进行了热释光信号分层测定。实验结果表明：泥石流发生后经过曝光，样品积存热释光晒退程度随深度增加逐渐减弱，光晒退明显。光晒退随光照强度和时间增大而增强，深度增大，但深度变化总体不大。模拟的阳光晒退实验晒退深度达1 mm左右，实际阳光晒退实验晒退深度达6 mm左右。根据等效剂量随深度的变化可知，天然泥石流块状样由两次泥石流堆积形成。...
Theory of polarizable liquid crystals: Optical birefringence
polarizable liquid crystals Optical birefringence
2014/9/24
The theory of polarizable anisotropic fluids is developed on the basis of a model fluid consisting of anisotropic Drude oscillators with embedded permanent dipoles. A matrix theory is developed. The d...
Excitonic energy transfer in light-harvesting complexes in purple bacteria
Exciton energy transfer light-harvesting complexes purple bacteria
2014/9/24
Two distinct approaches, the Frenkel-Dirac time-dependent variation and the Haken-Strobl model,are adopted to study energy transfer dynamics in single-ring and double-ring light-harvesting (LH) system...
离子液体中制备纳米TiO2/纤维素复合纤维及产物的光催化性能
离子液体 纳米TiO2 纤维素纤维 复合材料
2012/8/2
纳米TiO2/纤维素的复合纤维可以用于纺织、材料和催化等领域。在1-丁基-3-甲基咪唑氯盐(Cl)离子液体中,将纳米TiO2粉末与纤维素浆粕共混,采用湿法成型技术制备不同含量的纳米TiO2/纤维素纤维复合纤维。通过力学测试、傅立叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)对所得复合纤维的力学性能、形貌和结构等进行表征;以亚甲基蓝为模型物,对其光催化性能进行测试。结果表明,TiO2质量分数...
光化学是研究光与物质相互作用所引起的永久性化学效应的化学分支学科。由于历史的和实验技术方面的原因，光化学所涉及的光的波长范围为100～1000纳米，即由紫外至近红外波段。
近红外光谱分析技术在烟叶产地鉴别中的应用
近红外光谱分析 烟叶 产地鉴别
2012/11/6
为研究近红外光谱分析技术在鉴别烟叶产地中的可行性,以云南8个不同产地的880个烟叶样品为基础,通过TQ analyst分析软件的定性分析方法建立预测各烟叶产地的近红外模型,并应用该模型对100个烟叶样品进行了实际产地预测.结果显示,上述方法建立的预测模型对云南烟叶产地的鉴别准确率达90％.研究表明,应用近红外光谱分析方法对烟叶产地的鉴定是一种有效、准确和快捷的方法.
Optical properties of canopies of the tropical seagrass Thalassia testudinum estimated by a three-dimensional radiative transfer model
Optical properties of canopies tropical seagrass Thalassia testudinum three-dimensional radiative transfer model
2014/4/17
Three-dimensional models of seagrass canopies were constructed by treating leaves as flexible strips that fall under their own weight into naturalistic canopy structures. Canopy structures incorporate...