Influence of bias current and signal power on behaviour of an antireflection-coated laser amplifier

The variation of gain with wavelength of a 1.5 ?m semiconductor-laser amplifier with antireflection-coated facets has been measured over several modes. The internal gain and resonant wavelength were found using a curve- fitting technique and the dependence of these quantities on bias current and signal power was investigated.     

如何为黑白照片上色

<正>想要让老旧的黑白照片重新焕发光彩吗?Ben Brain将教大家一套比较简单的方法为扫描的黑白旧照片手工上色。如果你手上有一些黑白的旧照片或者单色的数码文件需要为其上色,那么这篇教程正适合你。我们将会告诉你如何在数码     

拍出《Top Gear》风格的汽车大片

想拍出全球最畅销的汽车杂志《Top Gear》风格的精彩大片么?想要留下汽车的艺术性微距影像吗? Ed Godden向你展示如何拍出更好的汽车摄影作品。     

Vascularized bone flaps versus nonvascularized bone grafts for mandibular reconstruction: an outcome analysis of primary bony union and endosseous implant success

We present a patient with a lesion of the mesial frontal cortex, including the supplementary motor areas bilaterally, who on clinical examination revealed no spontaneous movements, although neurophysiological examination indicated integrity of the corticospinal tract to thenar and tibialis anterior muscles bilaterally. The patient was alert, speech was hesitant, and he was able to move his hands only on command. The role of the supplementary motor areas in planning, setting, and execution of skillful voluntary movements has been previously established by direct cortical electrical stimulation and studies of regional cerebral blood flow. The findings in our patient support the role of the supplementary motor areas in initiating movements. The presence of motor evoked potentials after acute insults to the brain is considered to be associated with a good functional outcome. This is in contrast to our patient who did not show improvement in motor performance, despite preserved motor evoked potentials. Hence, in the case of bilateral lesions to the supplementary motor areas sparing the corticospinal tract, the presence of motor evoked potentials may not predict functional recovery.