医用超声诊断设备中存在两种声束形成技术。
There are two beamforming techniques in the medical ultrasound diagnostic equipment.
近年来在少数几个高档设备中使用了数字声束形成技术。
Thedigital beamforming technique is used by few advanced equipment in recent years.
结果表明，随着阵元间延迟时间的增加，声束偏转角逐渐增加。
The results show that the steered Angle of acoustic arrays increases with the delay time increasing between the neighbour elements.
但前进中的纵波声束不断向表面扩散而产生出新生的滑行集散波。
Yet the advancing longitudinal wave beam expands continuously towards the surface, and produces new gliding irrotational waves with it.
滑行集散波由于激发泥浆纵波而受到的损耗，要由纵波声束给以补充。
The energy loss of the gliding irrotational wave pair is made up by the longitudinal wave beam.
数字声束形成技术可以提高超声成像设备的对比分辨力、横向和纵向分辨力。
The digital beam forming technique can improve the contrast, lateral and axial resolution of ultrasound imaging equipment.
数字多声束形成技术可提高成像设备的时间分辨力，进一步提高横向分辨力。
The digital multi-beamforming technique can improve the time resolution and take further steps in the lateral resolution.
滑行纵波系由纵波声束、负指数滑行集散波和正指数滑行集散波三种成份所组成。
The gliding longitudinal wave contains three parts, longitudinal wave beam, negative exponential gliding ivro-tational wave and positive exponential gliding irrotational wave.
激发出泥浆纵波而使接收器获得讯号的是滑行集散波，纵波声束并不直接激发泥浆纵波。
It is the gliding irrotational wave pair, not the longitudinal wave beam itself that excites longitudinal wave in mud to generate signal.
采用数字扫描变换技术和数字声束形成技术的超声诊断设备被称为全数字超声诊断设备。
The ultrasound diagnostic equipment using the technologies of digital scan conversion and digital beam forming is defined as the digital ultrasound diagnostic equipment.
与传统的超声波探头相比，超声相控阵探头可以实现电子控制下的声束平移、偏转与动态聚焦。
Compared with traditional ultrasonic probe, ultrasonic phased array probe can realize transition, deflection and dynamic focusing of acoustic beam under electronic control.
高斯射线束方法相对于高斯波束方法的改进在于它使用了一个简单的经验公式来计算声束宽度。
The Gaussian ray bundle is similar to Gaussian beam, except that it uses a simpler method to arrive at the width of the Gaussian.
提出了一种利用空气中超声波非线性传播效应制作的、可产生高指向性可听声的新型声束扬声器。
A novel audio beam loudspeaker which based on nonlinear propagation effects of ultrasonic in the air to generate audible sound with high directivity is presented.
一种新颖的声束扬声器是捏造的利用超声波在空气中的非线性传播效应，产生声音的高指向性的声音。
A novel audio beam loudspeaker is fabricated by utilizing the nonlinear propagation effects of ultrasonic in the air to generate audible high directivity sound.
换言之，基本上超声波的传播声束极窄，这非常有利于将声波集中至指定地点，但对实际听力则无所助益。
In other words, ultrasound essentially travels in a very narrow beam — this makes it great for focusing the waves toward a desired area, but not for actual aural comprehension.
对于A型生物测量探头，通过在声束定向、测量位置和声速设置等方面的设计思想，有效提高测量精度。
For an a mode biometric probe, ultrasonic beam orientation, measuring position and speed setting ensured the precision of the measurement.
直径0.5吋的直探头放在钢板上，钢板后紧贴有丙烯树脂塑料。声束在两种材料中的扩散角约为（ ）。
A 10MHz, 0.5in. dia. , search unit is placed on steel and acrylic plastic in succession. The beam spread in these two materials is approximately.
离开固体表面稍远的区域，可以有平行于表面传播的纵波声束存在，但是需要与相应的滑行集散波相互衔接。
A little apart from the surf ace, the longitudinal wave beam may exist and propagate parallel to the surface, yet has to connect with its corresponding gliding irrotational waves.
通过适当的幅度加权、降低激励信号的频率、调整阵元的间距等措施可以改变辐射声束的方向和辐射主瓣的角宽。
The direction of acoustic beam and angular width of main lobe can be changed by properly amplitude-weighting, decreasing the frequency of impulsive signal and adjusting the interval of array elements.
因此相控阵列能够更加灵活、准确而快速地实现多样化的焦点模式和焦点扫描控制，是非常理想的声束聚焦手段。
So phased array is an ideal applicator that can congregate ultrasound beam and shift the focus more flexibly, rapidly and accurately.
分析了探头调整时脉冲回波信号的变化特点，在实验的基础上构建了声束入射角与表面波时域特征值间的关系模型。
Using the characteristics of pulse echo singal during the probe adjustment, a relation model between angle of incidence and time-domain eigenvalue of reflect wave signals was proposed.
采用将有限声束分解为一系列平面波的方法，对有限声束在液体-固体板-液体结构中的声反射问题进行了分析和计算。
Analysis and numerical computation have been performed for the reflection of acoustic beam on the solid plate surface of layered structure: liquid solid plate liquid.
我不能像老头那样远离尘埃，但听到每一声流言，看见每一束投来的目光，我无法不讨厌这个家，讨厌周围的街坊邻居。
I could not escape like this old man from house and neighbourhood, but hated both, hearing every whis- per, noticing every passing glance.
突然，Clifford听到一声轰鸣，看到一束强光。
用该种方法可以同时激发出传播方向相反的两束声。
Two ultrasonic beams in opposite direction can be excited simultaneously.
愿这一声的祝福，化作一盏灯，照亮你下班回家的路，化成一束鲜花，带给你你一份清香美丽。祝你端午节快乐！ ！
Like this soon as the blessing, into a lamp, light your way home from work, into a bouquet of flowers, to give you you a beautiful fragrance I wish you a happy Dragon Boat Festival!
愿这一声的祝福，化作一盏灯，照亮你下班回家的路，化成一束鲜花，带给你你一份清香美丽。祝你端午节快乐！
Like this soon as the blessing, into a lamp, light your way home from work, into a bouquet of flowers, to give you you a beautiful fragrance.
他透过半闭的眼睑，看到一束金色的火光；他听到噼啪声和愤怒的尖叫声。
He felt it drag his hand around like some great magnet, saw a spurt of golden fire through his half-closed eyelids, heard a crack and a scream of fury.
尽管玩笑或祝愿有时仅仅只是一声“你好”——那样简单，它却象一束来自天际的暖阳！
That little joke or note, or just a simple "hi", Could be like a ray of sunshine from the sky!
尽管玩笑或祝愿有时仅仅只是一声“你好”——那样简单，它却象一束来自天际的暖阳！
That little joke or note, or just a simple "hi", Could be like a ray of sunshine from the sky!
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