文章阐述了斩波调速原理,指出峰值电流的大小会影响元器件的寿命,所以有必要对瞬时电流的大小进行控制。
It is pointed out, while expounding the principle of chopper speed variation, that the value of peak current can affect the service life of components and so it is necessary to control.
碳纳米管表面镀镍后吸收峰值虽然变小,但吸收峰有宽化的趋势,这种趋势有利于制造宽频吸波材料。
Comparing with MWNTs, the maximum absorbing peak of the MWNTs with Ni coating reduce, but the band width has the broad trend.
旧金山——虚拟货币比特币的价格在新的一波投机狂潮中飙升,冲向了2013年年底达到的峰值。
SAN FRANCISCO - the virtual currency Bitcoin has been swept up in yet another speculative frenzy, pushing its price toward the peak it last reached in late 2013.
讨论了波的传播规律,并给出了铝材迎光面反冲速度峰值及比质量亏损与电子束的入射通量和能量之间的关系。
The relations between the peak front surface blow off velocity, specific mass loss and incident fluence and electron energy for aluminum are discussed.
在连续波泵浦下,反向自发辐射输出功率(ASE-)首先快速地增加到峰值功率,然后单调下降到稳态值;
Under continuous wave pumping, backward amplified spontaneous emission output power (ASE-) rapidly increases to peak value, and then decreases monotonically to steady-state value.
分析了冲击荷载峰值的构成情况,运用压力波理论结合颗粒流的应力关系建立了龙头冲击力的计算办法,并对概化后的龙头计算其在冲击坝体时的作用力垂向分布。
The make-up of the peak value of impact loading being analysed, the theories of pressure wave and granular flow are applied to establish a calculating method for estimating the flow head impact force.
提出了一种基于小波变换域的块匹配运动估计搜索的新算法,模拟实验表明,利用此算法可获得比一般运动块匹配方法更大的峰值信噪比,具有更好的性能复杂度比。
The authors present a new algorithm for block-matching motion estimation based on wavelet transform. The simulation shows that this algorithm has better PSNR and performance-to-complexity ratio.
探讨了浅层水中爆炸直达波压力峰值的计算方法。
The purpose of this paper is to examine the calculation method of direct shock wave peak pressure.
在此临界条件下,获得了临界爆轰胞格结构、沿壁面的速度和峰值压力曲线及流场波系演变特征。
Under this critical condition, the cellular pattern, the velocity and maximum pressure along the wall and the wave evolution of marginal detonation were obtained.
结果:水下冲击波物理参数的特征表现为高的峰值压力,正向持续时间较短,冲量较大。
RESULTS:The physical parameters of underwater blast wave were characterized by high peak pressure, short positive duration and great impulse.
通过预处理滤除工频周期分量,消除了小波变换在信号峰值处的模极大值,从而避免了对故障的误判。
As wavelet module maxima occur at peaks of signal, the pretreatment removes power frequency periodic components from electric signal and thus avoids misjudgments of fault.
借助经典的爆炸力学理论和回归拟合曲线方法,验证了爆炸空腔大小、应力波的应力峰值、应力波的作用时间。
The radium of blasting cavity, stress peak value and action time of stress waves are validated by the theory of classical explosion mechanics and the way of curve regression.
通过理论研讨,提出了浅层水中直达波压力峰值相对无限场中下降的临界时刻。
By theoretical researches, with a critical moment is presented at which the peak pressures of direct waves in shallow layer water begin to lower in comparison that in infinite water space.
提出了对彩色胶片进行颜色测量时所用的红色、绿色和蓝色峰值位置,半波宽度和峰值允差。
The corresponding peak value position, half band-width and peak value's allowance of Red, Green and Blue of color measurements of color negative films are provided.
结果水下冲击波物理参数的特征表现为高的峰值压力,正向作用时间较短,冲量较大。
ResultsThe physical features of underwater blast wave were characterized by high peak pressure, short positive action duration, and higher intensity of impulse.
分析了小波双线性插值中高频外推阈值门限与重建图像峰值信噪比的变化关系,提出了峰值信噪比最大小波双线性插值迭代算法。
The variable relationship between the threshold of the extrapolation and its correspondent Peak of the Signal-to-Noise Ratio (PSNR) in the Wavelet Bi-linear Interpolation Algorithm is deeply analyzed.
冲击波的破坏伤害作用主要取决于峰值超压的大小,立方根比例定律是定量估算冲击波超压最常用的方法。
The damage of shock wave mainly depends on peak overpressure and scaled cube root distance is the most common method to estimate the shock wave overpressure.
根据数字万用表的测试原理,提出了用其测量非正弦波电压平均值、有效值及峰值的简单实用的方法。
According to the principles of numeration table, the author puts forward simple but practical methods of how to measure the mean values, virtual values and peak values of non sine waves.
为了在保持原始图像信息的情况下,提高图像的空间分辨率,改善图像的峰值信噪比,在前期的研究中提出了小波双三次插值搜索算法。
In order to improve the resolution and PSNR of the obtained image without damaging its original information, the Wavelet Bicubic Interpolation Search Algorithm was proposed in the previous work.
通过对其速度波峰值和速度反应谱的分析,确定了两类波的相比条件和地震破坏烈度的标定。
By analyzing the peak value of their velocity record and velocity spectrum, the comparative conditions of these two kinds of waves and the damage intensity of earthquake are determined.
形成激波后,爆炸波两峰值往下游传播越来越靠近,测试结果与爆炸传播理论是相互验证的。
When the shock wave is formed, the propagation velocity of the two peak values of explosion wave, become nearer and nearer, that is reciprocally authenticated with the explosion propagation theory.
人工粘性能够较好地抑制冲击波压力计算中出现的数值振荡,但同时也引起了冲击波峰值的衰减。
The artificial viscosity can control the oscillations trailing the shock front, but it also weakened the peak pressure.
详细介绍了PWM式中峰值电流模式控制中的斜波补偿技术的原理。
The paper introduces the theory of slope compensation in the current-mode of control of PWM mode in detail.
研究结果表明,管内瓦斯爆炸过程中所产生的爆炸波有两个峰值,第一峰值为爆炸波压力,第二峰值压力为火焰到达后加热气体升压所致。
The result shows that there are two peak values, the first one is explosion wave pressure; the second is caused by the hot gas, which is heated by the subsequent flame.
获得了迎爆面中心反射压力峰值计算模型;分析了两个装药浅层水中爆炸冲击波对混凝土墩绕射及透射作用效应。
The calculation model of peak pressure was obtained and the diffraction and transmission effects of explosion shock wave on concrete frustum in shallow water were analyzed.
水中冲击波压力峰值在炮孔轴线上衰减比垂直于炮孔轴线向上衰减慢。
The peak pressure attenuation of shock in water in borehole axis direction was slower than the direction vertical to the borehole axis.
在激光打开和关闭时,都观测到了异质结光伏信号的瞬态响应峰值,且该峰值随斩波频率不断增大并在频率较大时趋于饱和。
The transient peak voltage of the heterojunctions were observed when the laser was turned on and off, and increased with chopping frequency and showed saturate tendency finally.
通过对数据分析,发现泡沫铝壳不仅可以消减爆炸冲击波峰值压力,而且可以有效地吸收冲击波比冲量和冲击波比能。
The experimental data analysis show that aluminum foams shell not only can weaken the peak pressure, but also effectively absorbs the specific impulse and the specific energy of shock wave.
通过对数据分析,发现泡沫铝壳不仅可以消减爆炸冲击波峰值压力,而且可以有效地吸收冲击波比冲量和冲击波比能。
The experimental data analysis show that aluminum foams shell not only can weaken the peak pressure, but also effectively absorbs the specific impulse and the specific energy of shock wave.
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