Because of the using of interpolation , noise shaping and switching amplification in the digital audio amplifier technology , the power supply modulator is not only much efficient but also behaving good in envelope amplification , this advantage is hard to implemented with conventional technology 数字音频功放技术是近年发展起来的高效率音频放大技术,该放大技术采用了过取样、噪声整形等数字音频处理算法和开关功率放大。采用该技术实现的电源调制器不但具备很高的效率,而且能高指标地放大包络信号,是常规的电源调制技术无法实现的。
In the recent years , new intelligent instruments are equipped with gpib ( general purpose interface bus ) interface , making it connected with the computer and forming automatic measuring system . the system not only improves the measuring precision but also has the data processing capability and replaces the hardware with the software to fulfill functions that the hardware cannot implement 目前,新型的测试仪器上都备有了ieee488接口,如果在计算机中配上ieee488标准接口卡,将一系列仪器通过ieee488接口与计算机连接,组成自动测试系统,实现测试自动化,提高了仪器测量的精度,对测量数据进行快速、准确的处理,这样就起到事半功倍的效果,并且可以软件来取代硬件甚至完成硬件无法实现的功能。
In this paper , a three - dimensional ( 3d ) program for the three - dimensional reactive flow fields of complicated geometric nozzle , which governed by the compressible full navier - stokes equations with realizable k - s turbulent model , has been upbuilt by using full implicit couple arithmetic and fvm ( finite volume method ) based on understanding and assimilation of a two - dimensional program group of cr ( chamber - radon ) . the new program fulfils the urgent need of numerical tools for simulating three - dimensional reactive flow - fields of hylte ( hypersonic low temperature ) and other latest nozzles , for which cr is out of action in simulation , and can be applied to simulate other chemical laser system , such as chemical oxygen iodine laser ( coil ) , overtone fluoride hydrogen , all - gas iodine laser , and so on . furthermore , some related topics about nozzles design and engineer ing also have been discussed 本文在二维cr ( chamber ? radon )程序研究的基础上,采用有限体积方法和完全隐式的耦合算法,通过求解带realizablek -两方程湍流模型的多组分、有反应的三维完全纳维埃?斯托克斯( n ? s )控制方程,建立了一套能够对复杂形状的三维喷管和光腔进行数值模拟的三维程序,解决了连续波df hf化学激光器增益发生器设计缺乏三维数值模拟工具的问题,并用该工具解决了cr程序无法实现的hylte等复杂三维喷管流场的理论模拟问题。
Abstract : on the basis of analyzing the partial key escrow system , a new partial key escrow scheme has been presented , which prevents against that the computational complexity in old systems is too height , but also prevents against that led ( law enforcement decryptor ) is too much power 文摘:在分析可验证部分密钥托管系统的基础上,提出了实现部分密钥托管的新途径.它不仅克服了以往可验证部分密钥托管方案中计算复杂度过高而无法实现的缺点,而且还进一步克服了这些方案中一次监听破坏部分特性和监听权力过大的缺点,为部分密钥托管的实际应用提供了新方法
North thoroughly studies the condition of causing institutional change and completing it . he considers that the expectation for acquiring the maximum potential profit , which ca n ' t be obtained in current system , is the reason causing institutional change . when anticipated net profit is more than anticipated costs , an institutional innovation will occurs 诺思认为,安排变迁的诱致因素是期望获取最大的潜在利润,潜在利润是一种现有制度安排结构内无法实现的收益,当预期的净收益超过预期的成本,一项制度就会被创新。