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Abstract: The conventional variable structure control technique for uncertain system requires that the uncertainty bound is known as a premise to assure robustness.The requirement creates an over-conservative controller and enlarges chattering.The propose
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文摘:常规变结构控制用于不确定系统，须利用不确定性界确保系统的鲁棒性，控制器过于保守且抖振变大.本文把未知干扰和参数不确定性的影响等效为名义系统的外界干扰，利用时延技术对干扰进行在线估计，并将估计值引入到变结构控制中，从而抵消掉系统中的慢变不确定性，利用离散趋近律法，推出了准滑动模态的存在条件及其带宽.该方法克服了以往控制方法中须已知不确定性界的限制，且不必满足匹配条件，用较低的控制增益保证了系统的鲁棒性，降低了准滑动模态带即削弱了抖振. |
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Abstract: The conversion from volume flow to mass flow is implemented by using intelligent flow computer with necessary accuracy. The converting method， field wiring and calibration results are introduced concretely.
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文摘:介绍利用智能流量计算机，在保证精度的情况下，实现了体积流量转换成质量流量。具体介绍了转换方法、现场接线与校验结果。 |
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Abstract: The correlation between the dispersion of trace element Se,Cu,Mo in geological environment and heart-blood vessel disease is introduced.
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文摘:介绍了地质环境中三种微量元素硒、铜、钼的分布特点及与人类心血管疾病的关系。 |
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Abstract: The corresponding concepts in different languages can't be understood with the same degree of efficieny or precision because of their unique ethnical colours and cultural implications.In addition,the existence of language lacuna also cause the l
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文摘:本文通过分析文化负载词在具体例句中的翻译，指出由于文化差异和词汇空缺现象的存在，在翻译过程中文化负载词内涵的失落往往是难以避免的。 |
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Abstract: The coupling between deformation of flexible body and the inertia forces caused by large overall motion is handled so simple that the complate erroneous results will be produced in dealing with the problems of high speed large overall motions by
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文摘:传统的柔性多体系统建模理论由于对柔性体的变形及其与大范围运动产生惯性力之间的耦合处理得过于简单，所以在分析存在高速大范围运动柔性多体系统的动力学性态时会得到完全错误的结论。 |
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Abstract: The crystal structures obtained by static solidification and vibration solidification were compared.It was showed that,in the case of vibration solidification,the orientation growth of the columnar crystal was not obvious,the equiaxial crystal a
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文摘:对球铁金属型静凝固与振动凝固的结晶组织对比表明：后者柱状晶方向性生长较弱，等轴晶出现较早，且两者的晶粒均较细，全断面硬度较高且分布均匀；前者枝晶奥氏体内溶质偏析大，有畸变夹杂团块。 |
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Abstract: The current study is focused on organic semiconductor lasers .
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文摘:近年来，有机半导体激光器已经成为一个新的研究热点。 |
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Abstract: The customization and improvement of the Embedded System's GUI are introduced.
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摘要:介绍嵌入式图形用户界面(GUI)的定制和改进。 |
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Abstract: The data collection system of a home-made photoacoustic spectrometer for photosynthesis study was reformed.
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文摘:对本室研制的用于光合作用研究的光声光谱仪的数据采集系统作了改进。 |
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Abstract: The data of UV-spectrum were compressed by wavelet transform,the compressed data were used as an input of artificial newral network.When the method was applied to determination of the Satongfen Injection,the convergent rate was improved.The mean
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文摘:通地小波变换压缩数据，以压缩后的数据作为人工神经网络的输入，极大地加快了网络的收敛速度.将该法应用于测定撒痛风注射液，结果良好.3组分的平均回收率及相对标准偏差分别为：100.1%，1.43%；100.0%，0.50%；100.6%，1.76%，优于单纯人工神经网络. |
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Abstract: The defects such as inclusion,splitting,dislocation and dendrite in the PbxLa1-x(Zry Tiz Sn1-y-z)O3(PLZST) single crystal grown from PbO-PbF2 flux by the slow cooling self-seeding technique were discussed in this paper.The forming mechanism of t
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文摘:本文介绍了助熔剂缓慢降温自发成核法生长的稀土掺杂锆钛锡酸铅镧(PLZST)晶体中出现的几种缺陷：包裹体、开裂、位错、枝晶，分析了这些缺陷的形成机理并提出了减少和消除这些缺陷的一些措施。 |
