成双成对的

The pulse width broadening of the femtosecond laser after angular dispersion wasdescribed,the pulse width expression at arbitrary propagation distance was provided,the pulse width broadening of the femtosecond laser by AOD was precisely predicted,thegeneral theory on pulse width broadening of plane wave,spherical wave and Gaussianbeam was deduced and the physical mechanism of pulse width broadening based on eachabove light beam model was revealed.

本文对随机扫描双光子显微镜中飞秒激光传输特性进行了系统深入的研究，完整解决了这一理论问题，发现了空间与时间色散通过角色散耦合的规律，为空间与时间色散同时补偿的方案提供了理论依据，基于此原理的单个角色散器件同时补偿空间和时间色散的方案高效解决了声光偏转器的色散补偿这一核心难题，为建立随机扫描双光子显微成像装置并应用于神经学研究奠定了基础：阐明了飞秒激光经角色散后的光斑展宽规律，获得任意传输距离处的光斑解析式，精确预测了声光偏转器对飞秒激光的光斑展宽，并揭示了光斑展宽的物理机制。

In Zhong Shan's artworks,"Double images" art has man's appearance and figure as the subject, and expresses in the form of "diptych". The two works are placed side by side, and can be compared and observed, expressing the meaning of two in one and the relationship between concepts such as the internal and the external, ego and alter ego, real image and virtual image, sense and sensibility, spirit and material, double image and corresponding and so on. His art shows that the artist is reflecting the contemporary society from a special view angle and that the symbols bearing the weight of human social and historical culture and contemporary ideology occur in various changing characters, showing the colorful world of today.

在艺术家钟山的艺术中，"双相艺术"是指以人物等容貌、外形为表现主体，以双联成对形式这种新的阐释方式呈现，它们相互并列对置，可进行比较、审视，共同表达一体两面、内在与外在、本我与异我、实象与虚象、理性与感性、精神与物质、双像与对应等理念的关系，传达出艺术家以另类视角审视当代社会，体现那承载着人类社会和历史文化脉络及当代流行意识形态的符码，形形色色交织演绎在万千变化的形象上，展现着今天这个缤纷万象的世界。

For double jet method, effects of used solvent, shape of stirrer, adding reactant position, reaction temperature, excessive silver ion concentration in reaction solution and adding rate on the nucleus formation, and growth of silver behenate crystal were systematically studied.

本文分别采用单注沉淀法和双注沉淀法制备了山嵛酸银晶体，通过对两种制备方法的对比及优选，最后确定双注沉淀法更适合制备细粒径的山嵛酸银，通过采用SEM、TEM等对山嵛酸银晶体形貌的表征发现，制备山嵛酸银所使用的溶剂、搅拌方式、加料的位置、反应温度、反应初始液中银离子浓度及加料速度等，均对山嵛酸银的晶体成核与生长有一定的影响。

The influence of microwave radiation on Ullmann reaction has been investigated by three Ullmann reactions, including triphenylamine formed by treating the diphenylamine with bromobenzene or Chlorobenzene which substitutes Iodobenzene; 4,4\'-dimethyltriphenylamine formed by treating 4,4\'-dimethyldiphenylamine with bromobenzene which substitutes Iodobenzene; 4,4\',4-trinitrotriphenylamine formed by treating 4-chloronitrobenzene with p-nitroaniline in this paper.

实验表明，在微波辐射条件下，顺式比反式迈克尔反应活性高；若在丁烯二酸的双键上引入甲基后，降低了进行迈克尔加成反应的活性；引入酯基对双键的影响比腈基有利于进行迈克尔反应，丙烯酸甲酯较丙烯腈的迈克尔反应活性高。

Bis vinyl phenyl terminated polydimethylsiloxane was synthesized by the hydrosilylation of bis dimethylhydrogen siloxyl terminated PDMS with m divinyl benzene. The structure of the VTPDMS was characterized by 1H NMR.

通过双二甲基氢硅氧封端的聚二甲基硅氧烷与间二乙烯基苯的硅氢加成反应制备了双乙烯基苯封端的聚二甲基硅氧烷，用1H NMR对其结构进行了表征。

In this study, genetic analyses were conducted to determine the genetic basis in an elite resistant inbred line Siyi with complete resistance to maize dwarf mosaic. A new genetic model, two dominant complementary genes conditioning the resistance, were found by Mendelian genetic analysis based on parents, F1, F2 and backcrosses in three successive years' field trails. The two genes were further mapped near the centromere of chromosome 3 and 6, respectively by tightly linked microsatellite markers using 242 plants from F2 generation. The resistance gene on chromosome 3 is 1.0 cM apart from the flanking markers phi053 and umc1527, respectively. Whereas the linkage distance between two flanking markers bnlg1600 and phi075 and resistance gene on chromosome 6 was 1.0 and 4.0 cM, respectively. Genotypic analysis of the plants from testcross and F3 populations supported the new genetic manners.

课题组通过连续三年的抗病鉴定，在国内种质资源中筛选出一份综合农艺性状优良、配合力较高的自交系四一，三年的表型遗传研究和两年的分子标记工作，发现四一中的玉米矮花叶病抗性是由两对显性互补基因控制的，进而利用F2作图群体，把发现的两个基因定位在第三和第六染色体的着丝点附近，并获得了双侧紧密连锁的分子标记连锁图谱，其中第三染色体上的分子标记UMC1527和phi053从抗病基因双侧逼近1 cM，而第六染色体上的分子标记phi075、bnlg1600从抗病基因双侧分别逼近4 cM和1 cM；利用B2群体、F2：3家系、BC3F1群体和带有第三、第六染色体抗病基因以及两个抗病基因的近等基因系，进一步证实了四一中成株期抗性是由两个显性互补基因控制的。

Chiral ligands mentioned above and their complexes with acetate copper were used as enantio-selective catalysts in asymmetric cyclopropanation reactions of diazoacetate and 1,1-diphenyl ethylene. Investigations indicate that all of them reveal certain optical-selective capability, but chiral C2-symmetric 2,6-bispyridine ligands show better catalytic capability than chiral asymmetric schifF-base ligands.

选择了2个手性2，6-吡啶双噁唑啉配体和6个手性不对称席夫碱配体与醋酸铜形成的配合物作为催化剂，对重氮乙酸乙酯与1，1-二苯乙烯不对称环加成进行催化反应，发现这8个催化剂对1，1-二苯乙烯的不对称环丙烷化反应都表现出了一定的光学活性诱导能力，手性2，6-吡啶双噁唑啉-铜类具有比手性Schiff碱-铜类更好的催化性能。

The oxidations of-abietic acid by 〓,〓 and 〓 under various reaction conditions and its addition reaction withdichlorocarbene were investigated.

本文首先从广西产松香中分离纯化得到松香酸，然后探讨了不同条件下〓等氧化剂对其共轭双键的氧化反应以及二氧卡宾对其共轭双键的加成反应。

By a piece of type-II critical phase matching biaxial crystal LBO for extra-cavity and for the compound system of telescope and Lens second-harmonic generation,green laser at 532 nm was achieved with average power of 40.6 mW,pulse duration of 16 ns, and peak power of 181 W.

先采用双凸透镜组合成的望远镜系统对1 063 nm的红外激光进行扩束，再对该光束聚焦，最后经双轴晶体LBO倍频后，得到了平均功率为40.6 mW，脉冲宽度为16 ns，重复频率为14 kHz，峰值功率高达181 W的绿光激光输出，1063 nm→532 nm的转换效率高达58%。

This dissertation is concerned with the approaches to a new high density liquid fuel , tetrahydrotricyclopentadiene, which can be synthesized with dicyclopentadiene as raw materials by three steps: Diels-Alder reaction, separation and hydrogenation.

本文以双环戊二烯为原料，通过双烯加成、分离、加氢反应得到目的产物——新型高密度液体燃料四氢三环戊二烯，主要研究内容包括： 1。三环戊二烯的合成采用两种方式对TCPD的合成进行了研究：DCPD直接热聚法、DCPD与环戊二烯双烯加成法。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。