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The study has focused on: 1 The research background and the current state of the power measurement were analyzed systematically, and then wavelet-based power measurement algorithm was certified feasible for astable signals; 2 We developed a new method of RMS and power measurement based on Dmeyer wavelet. After that three other wavelet measurement approaches were compared with Dmeyer wavelet-based measurement approach. Then the impact on measurement errors of amplitude frequency property and energy leakage of wavelet filter banks were deeply researched, and some measures were proposed to reduce it; 3 We developed a new strategy of power measurement algorithm based on lifting wavelet, which had calculation advantage compared with the first wavelet, so that it was more suitable for the realization of hardware; 4 The running system of wavelet-based power measurement algorithm based on DSP was proposed, and then it was realized on ICETEK-VC5416-A EVM board; 5 Existing problems and the further research direction of wavelet-based power sub-band measurement algorithm was discussed.
本文对基于小波变换的功率测量算法展开深入的分析研究,主要内容有:1)系统地分析了功率分解测量的研究背景、国内外的研究现状,并从能量守恒的角度验证了小波功率分频带测量算法在非平稳信号条件下的可行性;2)首次提出了Dmeyer小波变换有效值与功率的测量方法,进而通过对该方法与3种已经提出的小波测量方法的对比分析,深入研究了小波滤波器组的幅频特性和能量泄漏特性对测量误差的影响,并针对电网谐波的特点提出了减小影响的相关措施;3)首次提出了二代小波功率测量算法,对比一代小波功率分频带测量算法,它大大减少了算法实现的运算量及内存的需求量,从而更适合于硬件的实时实现;4)提出了小波功率分频带测量算法的DSP实现方案,并在ICETEK-VC5416-A EVM板上进行了实现;5)探讨了小波功率分频带测量算法目前仍存在的问题,并提出了进一步的研究方向。
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He also extended quasi-geostrophic non-acceleration theorem to primitive equation non-acceleration theorem.
他在国际上首创湿倾斜涡度发展理论和全型垂直涡度方程,成功地揭示青藏高原西南涡和夏季江淮流域的暴雨发展机理,揭示副热带高压形态变异的成因;证明创新的原始方程中的无加速定理以及大气运动的动力强迫和热力强迫的调配率;开展创新性气候动力研究,揭示中高纬和热带海气相互作用差异的机理及厄尔尼诺影响台风频率的机制,继承和发展了我国学者关于青藏高原对大气环流和天气气候影响的研究;在国际上首次把亚洲季风爆发分为三个阶段,证明由于中高纬度的强地转性和斜压性使其海气相互作用的特征与热带显著不同;首次用数值模式提出厄尔尼诺影响台风的机制,得到国际上的高度评价。
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And There was no serious complication;②In the course ofinterventional therapy, Direct portal vein angiography demonstrated vena coronaria ventriculi(100%)andgastricveins(65.26%)andvenagastricaposterior38.43%, Angiography demonstrated venacoronariaventriculi communicate esophagus varicose veins, gastric veins and vena gastrica posterior communicategastric varicose veins. vena coronaria ventriculi had only a small percentage of double vein, about30.57%. The sites of vena coronaria ventriculi arising from the portal vein, splenic vein, portosplenic junction, were found in 52.06%、27.39%、20.55% respectively.③12 extrahepaticprotosystemic shunts were found in these patients. Include gastro-nephrosshuntof 3 cases, 7 caseswere splenetic- nephros shunt and 2 cases shown recanalization of umbilical vein .④The averageportal pressure before and after the procedure were 3.87±1.82kPa and 3.64±1.14kPa in 73patients, but to the time of rebleeding, it was 3.96±0.23kPa in the 11 cases.⑤There werethree kinds of variceal outcome: disappearance (54,low degree (19).⑥Spearman logisticanalyse and ANOVAtest shown liver function class, variceal degree of the splenic necrosis area,the blood direction in portal vein before operation and remain small collateral routes were thesignificant factors concerning outcome of varices.⑦The bleeding volume and portalhypertensive gastropathy are main risk factors of rebleeding.⑧The course of livercirrhosis is the risk factor of survival and extrahepatic portosystemic shunt , fine varices are thebeneficial factors to survival.⑨During all cases'followed-up data, the 1, 2, 3, 4, 5 yearcumulative survival rates and rebleeding rates were 17.81%, 28.77%, 38.36%, 43.84%, 47.95%and93.15%,91.78%,86.30%,83.56%,80.82%respectively. Conclusion The interventional disconnection treatment for liver cirrhosis and portalhypertension was designed suitability. It rapidlycontrol bleeding,butpressure of portal vein was notobvious high, perfusion was not low .it was compared with surgery therapeutic that interventionaldisconnection treatment was safe and had a significant clinical effect to hemorrhage and preventfrom rebleeding.
结果:①术后一过性发热62例(84.9%),腹痛腹胀48例(65.8%)是介入断流术常见的并发症,未发生严重并发症;②门静脉造影显示胃冠状静脉、胃短静脉和胃后静脉的曲张分流的出现率是100%、65.26%和38.34%;显示食管静脉曲张主要由胃冠状静脉供血,胃静脉曲张主要由胃短静脉和胃后静脉供血;胃冠状静脉大多数为单支,少数为双支,其双支的出现率分别为30.57%;胃冠状静脉开口于门静脉主干的为52.06%,开口于脾静脉主干的为27.39%和开口于门脾静脉交汇处的为20.55%;③发现胃肾分流3例,脾肾分流7例、腹膜后门腔静脉分流2例,以及CTA检查发现脐静脉开放者2例;④73例患者介入断流术前和术后平均自由门静脉压力分别为3.87±1.82kpa和3.64±1.14kpa,前后比较存在显著性差异;11例再次介入手术患者的术前、术后和复发后的自由门静脉压力分别为4.02±0.24kpa、3.82±0.25kpa和3.93±0.23kpa ,前后比较发现首次术前与术后存在显著性差异,首次术前和复发出血术前门静脉压力比较无显著性差异;⑤介入术后复查曲张静脉转归基本消失54例,轻度19例;⑥Spearman相关分析和Logistic多因素回归分析,肝功能分级、静脉曲张程度、门脉血流方向和残存小侧支四个因素对曲张静脉转归有影响;Spearman相关分析和Logistic多因素回归分析门脉高压性胃病和出血量等因素对复发出血时间有影响;⑦COX回归分析,门体分流和曲张静脉转归两个因素对术后生存有影响;⑧术后随访6-70月,1、2、3、4、5年的累计复发出血率和累计生存率分别为17.81%、28.77%、38.36%、43.84%、47.95%和93.15%、91.78%、86.30%、83.56%、80.82%;结论:介入断流术治疗门脉高压食管胃底静脉曲张有独特的优点,可以快速直接控制曲张静脉出血而门静脉压力无显著增高,保证了肝脏灌注;与外科分流术相比适应证广、损伤轻、术后恢复快,不易遗漏曲张静脉;肝功能分级、曲张静脉程度、门脉血流方向和残存侧支血管对食管胃曲张静脉转归有影响;门脉高压性胃病对复发出血时间有影响;门体分流和曲张静脉转归对生存时间有影响。
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The properties and expression of knowledge are discussed in brief and binary and multiple truth expression and inference of knowledge are studied focally. The neural networks which can realized the three valued logic are overviewed. The new idea of uncertain inference based on three valued logic is proposed for the first time The models of neural logic, which can realize three valued logic and uncertain three valued logic inference are proposed, too. The learning algorithm of coefficient of MVL's function based on the canonical realization of MVL network is investigated for the first time and the appropriate algorithm is proposed.
4简要地论述了知识的特征及其表现形式,重点研究了知识的真值二值和多值表示法以及基于知识真值表示法的逻辑推理;通过对目前可实现三值逻辑推理的逻辑神经元及其网络的简要回顾,指出了各自的局限性,首次提出了基于三值逻辑的不定性推理的新概念以及可实现三值逻辑和三值逻辑不定性推理的逻辑神经元模型,同时对基于这种逻辑神经元模型的推理系统的应用领域进行了探索性尝试;另外,首次对基于多值逻辑网络正规实现的多值逻辑函数的系数参数的学习算法进行了研究,并提出了相应的学习算法。
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The above method can be used as a general method of determining molecular weight distribution of polymers.4.Solid-state ~1H wide-line NMR and ~(31)p magic angle spinningNMR were applied to a series of PEI/DNA complex samples with different PEI molecular weights and nitrogen/phosphatemolar ratios,in order to disclose the influence of various structural factors on the interactions and morphology.The results of ~1H NMR spectra showed that the linewidth of the PEI signal was greatly broadened with increasing the N/P ratio.Meanwhile,in the ~(31)p M_AS experiment,the signal was found to shift upfield with the increase of the N/P ratio.Both ~1H and ~(31)P NMR experiments demonstrated that the interaction between two constituents and subsequently the morphology of the complexes vary with the N/P ratio.
首次将固体核磁共振应用到聚合物/DNA复合物体系,观察复合物体系中不同N/P比对其相互作用和相结构的影响,研究表明N/P比的变化对聚乙烯亚胺/DNA基因递送体系分子水平上相互作用有着很大的影响;另外,还发现不同分子量的聚乙烯亚胺聚合物载体在N/P比为3的情况下对复合物中DNA的微观尺度没有明显影响;通过氢的自旋扩散实验,首次测得在PEI/DNA复合物体系中DNA相尺寸的大小,并发现在体系中N/P比达到3以上的复合物中DNA和PEI达到了分子水平上的相容。
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The intensity ratio of TO and LO inMCT was observed to be different. Such difference was explained in terms of the different Ramangeometry arrangement.〓. The laser-induced micro-photoluminescence in the range of 1000~5000〓(1.34eV~1.83eV) was found for the first time in LPE MCT epilayer. The center of photoluminescence wasat 2750〓 or 1.62eV and the FWHM of luminescence was 2000〓 or 0.25eV. We assume thatthe photoluminescence is due to recombination of electron from an anion vacancy resonance levelto the top of valance. In addition, new Raman shift was observed at 750〓 in LPE MCTepitaxial film.〓. The laser-induced micro-photoluminescence with quasi-periodic structure was observed forthe first time at room temperature in one of MOVPE MCT epitaxial film samples. The range offluorescence was from 1.46eV to 2.21eV, i.e., 1.73eV above the conduction band edge.
2首次在LPE生长的碲镉汞外延薄膜的显微Raman谱中,在1000~5000〓范围发现了激光激发显微荧光,该荧光的发光范围换算为电子伏特标度为1.34eV~1.83eV,荧光的发光中心大约位于2750〓,即1.62eV,发光的半峰高宽约为2000〓或0.25eV;指出该显微荧光来源于碲镉汞薄膜中的阴性离子空位共振能级的激光激发发光;观察到了碲镉汞外延薄膜中一个新的Raman散射峰,位于750〓位置; 3首次在一块用MOVPE方法生长的〓Te外延薄膜的显微Raman谱中,发现了1.46eV至2.21eV范围并伴随有周期结构的显微荧光峰,该发光峰对应的能带中心位于〓Te材料导带底上方1.73eV,通过研究得出样品在1.46eV至2.21eV范围的显微荧光峰是由于改进 MOCVD 生长工艺,提高了碲镉汞外延薄膜的结构质量所致;通过分析指出该显微荧光来源于外延层中的阴性离子空位的共振能级发光。
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The main creating aspects are finding and clarify such a fundamental physical process that the grain boundaries emit vacancies under compressive stress to induce solute non-equilibrium grain boundary dilution and absorb vacancies under tensile stress to induce non-equilibrium grain boundary segregation, formulizing the structural equations and the composition equations in force equilibrium in grain bounary region to describe this physical processes and the kinetic equations for non-equilibrium grain boundary segregation under tensile stress, calculating the modulus in grain boundary region from the expermental data of grain bounday segregation using the structure and coposition equations and calculating the diffusion coefficients of vacancy-solute atom complexes using the kinetic equation simulating the experimental results of grain boundary segregation.
本项目的主要创新点是,发现并阐明了弹性应力场作用下空位与晶界交互作用的基本物理过程:在张应力作用下,晶界会吸收空位,引起溶质非平衡晶界偏聚;压应力作用下,晶界会发射空位,引起非平衡晶界贫化。建立了描述此物理过程的晶界区力学平衡的结构方程和成分方程;?建立了张应力引起的非平衡晶界偏聚动力学方程?;用晶界区力学平衡的结构方程和成分方程?,首次通过实验测量计算出多晶材料晶界区的弹性模量;通过建立的动力学方程模拟实验结果,首次获得溶质原子-空位形成的复合体的扩散系数。
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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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Prediction the protein subnuclear locations; c we have for the first time extended the prediction scope to cover 22 subcellular locations, which greatly improves the practical value of the computational models.
本文首次在国际上提出并探讨了a 蛋白在细胞中多个位置出现的预测模型;b 蛋白在细胞核中出现的位置的预测模型,即&亚亚细胞位置预测模型&,获得国际学术界的认可;c 本文首次将亚细胞定位的预测研究推广到覆盖22个亚细胞位置,极大地提高了预测模型的实用价值,并提出了融合蛋白序列高层基因本体特征及序列自身氨基酸特征的蛋白亚细胞位置预测方法,提出了面向不同物种的亚细胞定位的预测新思路;结果表明新算法方法在严格的数据集上获得了比传统算法方法高出35%以上的预测精度,所开发的工具被广泛应用于生物实验中。
- 推荐网络例句
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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。
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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。
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Very pretty, but the airport looks more fascinating The other party wisecracked.
很漂亮,不过停机坪更迷人。那人俏皮地答道。