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This problem is also important and valuable in Nonlinear Optics. It will be very helpful to understand how the aberrations affect the course of three- wave mixing, such as the change of conversion efficiency, the distribution of intensity and phase.Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental waves aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.
首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解;通过建立国防科学技术人学研究生院学位论文三维数值模型,编写相应仿真程序,首次得到了位相畸变光束倍频过程的大量计算结果,深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素;得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同,但谐波的远场发散角明显地比相应基波的小的结论;得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下,位相畸变传递到二次谐波的估算式;举例分析了KDP三倍频方案中,基波位相畸变对二次谐波和三次谐波的影响;实验工作中,用哈特曼一夏克传感器分别对IO64nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量,给出了相应结果。
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Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental wave's aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.
首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解;通过建立三维数值模型,编写相应仿真程序,首次得到了位相畸变光束倍频过程的大量计算结果,深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素;得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同,但谐波的远场发散角明显地比相应基波的小的结论;得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下,位相畸变传递到二次谐波的估算式;举例分析了KDP三倍频方案中,基波位相畸变对二次谐波和三次谐波的影响;实验工作中,用哈特曼-夏克传感器分别对1064nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量,给出了相应结果。
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In treatment, acupoints of the two meridians with the exterior-interior relationship may be alternatively used.
在治疗上,表里两经的穴位可以相辅为用。
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In treatment, acupoints of the two meridians with the exterior-interior relationship may be alternatiely used.
在治疗上,表里两经的穴位可以相辅为用。
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The results show:(1) After soybean seed is treated with seed coating, The length of lateral root anlage Initiating area obviously increases in contrast with control (seed which is not coated with agent is regarded as control; shortened form is CK).The order is from greatness to smallness in turn as follow: HK>ND>CK.(2) Initiating progress of lateral root anlage is quickened when seed is treated with seed coating. General trend is as follow: HK>ND>CK. By variance analysis, treatment and control has obvious difference.(3) Initating status of lateral root anlage is definite related with contents of endogenous hormone. Occurring of lateral root is as the result of some endogenous hormone corresponded and playing manysided role, especially IAA plays important role in the cause of inducing to occurring of lateral root anlage.(4) The use of seed coating may elevate the number of lateral root anlage occurring and shorten the time of lateral root anlage occurring, especially the effect of Chemical control seed coating is better.
结果表明:(1)种衣剂包衣后,侧根原基发生区长度明显比对照(不包衣的种子为对照,用CK表示)增加,从大到小依次为:HK>ND>CK;(2)种衣剂处理加快了侧根原基的发生进程,总的趋势是HK>ND>CK,经F检验表明,处理和对照差异极显著;(3)侧根原基的发生状况与侧根原基发生区内源激素的含量有一定的关系,侧根的发生是几种植物内源激素相互协调、综合作用的结果,其中生长素类物质在诱导侧根原基的发生过程中起主导作用;(4)应用种衣剂可以提高侧根原基发生的数量,缩短侧根原基的发生时间,其中以化控种衣剂效果最好。
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The bamboo and wood instrument with top grade of tone quality are scarce. It was estimated that can't reach one hundredth of its total.Second, the same tone quality of Qin (the name of a kind of musical instrument) can' t be made of the same kinds of bamboo and wood material. Such as the jinhu, which is made of Nan bamboo. But its tone quality was quite different. And pad auks erhu (Chinese two-stringed musical instrument) and the violins were the same.
如小提琴,其共鸣箱是用云杉、枫木制作的,但音质相差非常悬殊,红木二胡、京胡等亦是如此;第三、红木乐器、檀木乐器价格太昂贵,且音质高档的也不过占其总数的百分之一、二;第四、过去制作的竹木乐器,在刚制作完毕时,其音量和音质都比较差,须经数年后,其音质才能纯净些,音量也才能大一些。
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With the help of recommended abrasives and techniques, through the process of heating – roughly hot rolling – precisely hot rolling in a variety a machines, hot rolls can be shaped into high-precision aluminium belts, which shall better meet the growing needs of the PS baseboards for pots and the simifinished aluminium foil sheets, for there is a big market gap and high grade request for high-precision aluminium belts in the market.
三、建设规模:年产40万吨高精度铝板带热轧卷;工艺技术:采用国际先进的热轧生产技术,由铸锭经加热—热粗轧—多机架热精轧的生产工艺,配合引进的工艺技术磨具可满足制罐料 PS 板基、双零铝箔坯料等市场缺口大的高精度铝板带产品对热轧卷的质量要求;主要设备:包括铸锭铣床一台、推进式加热炉3台、2400mm1+4热连轧生产线一条、轧辊磨床2台(国外引进1台),预计引进设备需用外汇8000万美元。
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Somatic science is the science of man in cosmic environment;in the languege of systems science,the human body is considered to be an open complex giant system embeded in the supergiant system of comic sorld;here "open"is referred to the human body environment,"giant"means the number of the constituting members of the system runs to billions and billons,"complex"means the kinds of the constituting members are also numerous and the interactions among the members are of great variety,Somatic science thus departs in basic viewpoint from the classical reductionist physiology.
易经》对中华文明史的影响人体科学的基本学说是我国著名科学家钱学森同志提出的,全文[1]如下:人体科学是宇宙环境中的人类科学,用系统科学的话来讲,人体被认为是包涵在宇宙这个超巨系统中的开放复杂巨系统。这&开放&是对人体环境而言,&巨&意味着构成系统的成员的数目多达数十亿,&复杂&的意思是指组成成员的种类也是非常多的,而成员之间的相互作用又是多种多样的。因此人体科学的基本观点就这样与经典的、还原论指导下的生理学的基本观点不同。
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The bulbils that grow on the leaves can be used to propagate new plants, treated similar to "seeds".
珠芽,关于叶子可以用来传播新厂,经处理类似&种子&。
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Latest researches in the catalysts for synthesis of carbamate by ammonolysis of dimethyl carbonate;2. Progress in the catalysts for synthesis of carbamates by ammonolysis of dimethyl carbonate;3.4,4′-Methylene diphenyl carbamatewas synthesized by ammonolysis of dimethyl carbonate, a substitute of phosgene, and 4,4′-diaminodiphenyl methane with anhydrous zinc acetate as catalyst.
用碳酸二甲酯代替光气,以4,4′-二氨基二苯基甲烷为原料,在无水醋酸锌催化剂的作用下,经胺解反应合成了4,4′-二苯甲烷二氨基甲酸甲酯;测定了MDC的熔点;采用傅里叶变换红外光谱和氢核磁共振对产品结构进行了表征;考察了反应温度、DMC用量、反应压力、反应时间、催化剂用量对MDC收率的影响。
- 推荐网络例句
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But we don't care about Battlegrounds.
但我们并不在乎沙场中的显露。
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Ah! don't mention it, the butcher's shop is a horror.
啊!不用提了。提到肉,真是糟透了。
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Tristan, I have nowhere to send this letter and no reason to believe you wish to receive it.
Tristan ,我不知道把这信寄到哪里,也不知道你是否想收到它。