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11.
本论文涉及的问题是功能材料的分子设计、合成和按预定分子顺序取向排列的薄膜制备,是当前科学技术的前沿课题之一。合成了一系列荧光素衍生物包括由荧光素和电子给体(葱、吩唾嗓)及电子受体(紫精)组成的模型化合物和二元化合物,其中九种是具有亲水基团和疏水基团的长链烷烃衍生物。并在此基础上制备了LB膜,详细地研究了它们的成膜特性。运用荧光显微镜、透射电子显微镜、原子力显微镜、反射椭圆偏振法、X-射线衍射法、转移折叠法和偏振红外光谱法等多种现代仪器和分析方法,研究了膜的均匀度、平均折射率和厚度、功能团取向与LB膜的结构问题,并讨论了分子结构和取向与性能的关系。 相似文献
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高等数学(以下简称高数)是工科院校最重要的基础课之一,也是大学一年级学时数最多的一门课程.它不仅是学生学习后继课程的必要基础,而且对学生各种能力的培养有着重要作用.通过高数的教学,对于刚刚结束中学学习的一年级学生掌握大学阶段的学习方法,培养良好的学风,也有着重要的意义.因此,本门课程的教学质量、教学效果不仅关系到学生对该门课程的学习,而且将直接或间接地影响到后继课程的教学,最终影响到高质量人才的培养.那么,怎样才能找准提高教学质量的切入点呢?我认为:教师只有真正认清和掌握学生学习的兴趣、动机等心… 相似文献
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The properties of six kinds of intrinsic point defects in monolayer GeS are systematically investigated using the“transfer to real state”model,based on density functional theory.We find that Ge vacancy is the dominant intrinsic acceptor defect,due to its shallow acceptor transition energy level and lowest formation energy,which is primarily responsible for the intrinsic p-type conductivity of monolayer GeS,and effectively explains the native p-type conductivity of GeS observed in experiment.The shallow acceptor transition level derives from the local structural distortion induced by Coulomb repulsion between the charged vacancy center and its surrounding anions.Furthermore,with respect to growth conditions,Ge vacancies will be compensated by fewer n-type intrinsic defects under Ge-poor growth conditions.Our results have established the physical origin of the intrinsic p-type conductivity in monolayer GeS,as well as expanding the understanding of defect properties in lowdimensional semiconductor materials. 相似文献
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Photosensitization of TiO2 colloid by hypocrellin B (HB),a natural photodynamic pigment with extremely high photosta-bility,has been studied by surface enhanced Raman spec-troscopy (SERS),laser flash photolysis and electron paramagnetic resonance (EPR) techniques.The photoseiisitization of TiO2 occurred practically from the excited triplet dye and the electron injection rate constant is 1.3×106 s-1.The influences of donor and acceptor on the electron injection were investigated. 相似文献
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Numerical method of studying nonlinear interactions between long waves and multiple short waves 总被引:1,自引:0,他引:1
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Although the nonlinear interactions between a single short gravity
wave and a long wave can be solved analytically, the solution is
less tractable in more general cases involving multiple short waves.
In this work we present a numerical method of studying nonlinear
interactions between a long wave and multiple short harmonic waves
in infinitely deep water. Specifically, this method is applied to
the calculation of the temporal and spatial evolutions of the
surface elevations in which a given long wave interacts with several
short harmonic waves. Another important application of our method is
to quantitatively analyse the nonlinear interactions between an
arbitrary short wave train and another short wave train. From
simulation results, we obtain that the mechanism for the nonlinear
interactions between one short wave train and another short wave
train (expressed as wave train 2) leads to the energy focusing of
the other short wave train (expressed as wave train 3). This
mechanism occurs on wave components with a narrow frequency
bandwidth, whose frequencies are near that of wave train 3. 相似文献
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Pitch is one of the most important auditory perception characteristics of sound; however, the mechanism underlying the pitch perception of sound is unclear. Although theoretical researches have suggested that perception of virtual pitch is connected with physics in cochlea of inner ear, there is no direct experimental observation of virtual pitch processing in the cochlea. By laser interferometry, we observe shift phenomena of virtual pitch in basilar membrane vibration of exsomatized cochlea, which is consistent with perceptual pitch shift observed in psychoacoustic experiments. This means that the complex mechanical vibration of basilar membrane in cochlea plays an important role in pitch information processing during hearing. 相似文献