D-A

Polymer-supported chiral auxiliary has been widely applied in asymmetric aldol reaction, alkylation reaction, Mannich reaction, D-A reaction and obtained a good asymmetric induction and purification effect.

聚合物支载手性辅助试剂在不对称羟醛缩合反应、烷基化反应、Mannich反应、D-A反应等中得到广泛的应用，取得良好的不对称诱导和分离纯化效果。

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The serial synapses were observed, 1. The dendro-axo-dendritic synapse ( D-A-D1): The dendrite D synapses with the axon terminal A to form the dendro-axonic synapse ( D-A);

该核内的连续性突触有：1.树轴树突触（D-A-D1）：树突D内只含少量扁圆形突触小泡，与轴突A形成树-轴突触（D-A）；

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The D-A Compoud Techniques and Its Development to Temperature Control Instruments

数字模拟复合技术与新型温控仪表的研制

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All these models give good fit to the experimental data of methane adsorbed by coals including adsorption and desorption, the D-A model gives the best fitting degree to experimental data, the Langmuir model gives the worst one;

这些模型对煤吸附和解吸过程中的吸附CH4实验数据都具有较好的拟合，D-A提供了最好的拟合，Langmuir的拟合度最差；

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NIR dyes can be divided into metal complexes, ionic dyes, large π-conjugated compounds and donor-acceptor ( D-A).

近红外染料大致可分以下三种类型：金属配合物型、离子型和电子受体-电子供体（D-A）型。

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Using Energy Transfer to Probe Solvent Dependent Conformational Changes in a D-A Podand

用能量转移探测萘-蒽二元分子体系的构象变化

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The main results are as follows: 1. "D-A" copolymers P1~ P4were designed and synthesized which based on PMDI unit and four different electron-rich units.

主要结果如下：1.设计并合成四种基于PMDI单元和不同给电子单元的“D-A”结构共聚物P1-P4。

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A sectional design technique is described in the paper, which. combined with the conventional high-speed bipolar digital IC technology, can ensure the monotonicity of D-A converters by using diffused resistors, eliminating the need for laser trimming. By using this technique.

本文介绍的分段设计技术只需要采用常规的高速双极数字IC工艺，采用扩散电阻方法，不需要微调技术，就能保证其D/A的单调性。

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It was found that these complexes can accelerate the rate of the D-A reactions, but almost had no effect on the ratio of endo to exo of the products by introduction of various substituents in comparison with the reaction in the absence of the catalyst.

实验结果表明：与没有催化剂的反应体系相比，这些稀土配合物能明显加快反应速度，但未能明显提高产物的内外型比例。

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All electronic multiplexing D-A converter system in industrial control computer

工业控制计算机中的全电子多路数-模转换系统

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Synthesis, Characterization and Properties of Covalently Linked Porphyrin-Fullerene D-A Compounds

共价键连卟啉&富勒烯二元D-A化合物的合成、表征及性能研究

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Linear Measurement of D-A Converter

数模转换器的线性测量

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For the synthesized D-A type molecules ( 4a-4F), the solvent effects, absorption spectroscopy, fluorescence spectroscopy, and cation effects test of Cu+ and Fe3+ were carried out. The corresponding fluorescence quantum yield was also calculated.

对合成的D-A结构化合物4a-4f分别进行了溶剂化效应、吸收光谱、荧光光谱及Cu2+、Fe3+阳离子效应的测试，并计算了荧光量子产率。

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Because the structure is based on current replication while not on current division, it can overcome the defects of current-domain D-A converter.

电流舵型数模转换器只受到电流开关速度的影响，相对于电压型和电荷型结构具有高速的优势，并且这种结构是基于电流复制而非电流划分，可以很好地克服电流型结构的缺陷。

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Synthesis and Properties of D-A Type of Organic Solar Cells Containing Fullerene

含富勒烯的D-A型有机太阳能电池材料的合成及其性质研究

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We studied the thermal stability, electrical and photophysical properties via Cyclic voltammetry, Absorption and Fluorescence spectra, thermogravimetric analysis. The relationship between the polarity of solvents and the conjugation length of the D-A structure with luminescent properties have also been studied.

利用循环伏安法，紫外吸收光谱，荧光发射光谱，热重分析等对其电化学性能，光学性能，以及热稳定性进行研究，同时考察了溶剂极性和D-A结构共轭长度对发光性能的影响。

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C60 is a good electron acceptor, can make D-A molecular which is applied to photovoltaic devices designing;

C（60）是一种良好的电子受体，能形成D-A型分子体系，从而用于光电器件设计；

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