排序方式: 共有40条查询结果,搜索用时 46 毫秒
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对杆和梁在锁定过程的响应进行了详细分析,用波传播理论解释了部分结果的物理含义,对用Euler梁理论分析锁定问题的可行性进行了探讨。 相似文献
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Coriolis质量流量计及其原理分析 总被引:2,自引:0,他引:2
分析了质量流量计的工作原理,并讨论了有关频率和仪表系数的计算. 相似文献
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冷冻去脂-固相萃取/气相色谱-质谱法对水产品中禾草丹、溴氰菊酯及19种有机氯农药残留的测定 总被引:9,自引:3,他引:6
建立了气相色谱-质谱快速测定水产品中禾草丹、溴氰菊酯及19种有机氯农药残留的方法.样品经乙腈提取后采用冷冻法去除提取溶液中的大量脂肪,再经氨基固相萃取柱进一步净化后用GC-MS测定.21种农药在0.1~2.0 mg/L范围内线性良好,相关系数r>0.999,样品添加量为0.02~0.1 mg/kg时回收率为79%~114%,相对标准偏差不大于13.5%,检出限为0.5~20 μg/kg(S/N=3). 相似文献
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利用色相色谱/质谱联用技术,傅立叶红外及裂解-气相色谱/质谱联用技术,对印刷用上光油的关键成分进行了分析,共鉴定出7种挥发性组分,2种高分子聚合物。 相似文献
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核反应中,核温度参量与核反应中的轻粒子的能谱、粒子非稳态布居及同位素产额有直接的依赖关系,通过有关物理量的测量可以实现核温度参量的提取. In this paper we present many observables of the nuclear reactions related to the temperature parameter,and several methods which devoted to the establishment of the nuclear temperature therometer. 相似文献
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In this paper, the synchronization and the parameter identification
of the chaotic Pikovsky--Rabinovich (PR) circuits are investigated.
The linear error of the second corresponding variables is used to
change the driven chaotic PR circuit, and the complete
synchronization of the two identical chaotic PR circuits is realized
with feedback intensity k increasing to a certain threshold. The
Lyapunov exponents of the chaotic PR circuits are calculated by
using different feedback intensities and our results are confirmed.
The case where the two chaotic PR circuits are not identical is also
investigated. A general positive Lyapunov function V, which
consists of all the errors of the corresponding variables and
parameters and changeable gain coefficient, is constructed by using
the Lyapunov stability theory to study the parameter identification
and complete synchronization of two non-identical chaotic circuits.
The controllers and the parameter observers could be obtained
analytically only by simplifying the criterion dV/dt<0
(differential coefficient of Lyapunov function V with respect to
time is negative). It is confirmed that the two non-identical
chaotic PR circuits could still reach complete synchronization and
all the unknown parameters in the drive system are estimated exactly
within a short transient period. 相似文献
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介绍了宽禁带II-VI族化合物半导体ZnSe,ZnSSe和ZnCdSe外延膜及它们的超晶格的分子束外延生长.用X射线衍射法(XRD)和光致发光(PL)法分别对其结构特性和光学特性进行了研究.尤其是对超晶格样品所进行的温度变化的PL研究,得出了对于ZnSe/ZnSSe超晶格,其激子激活能(E_(?))仅为17meV,我们用ZnSe/ZnSSe导带不连续较小来解释这个结果.而对于ZnCdSe/ZnSe超晶格,其E_(?)则为41meV,这说明此类超晶格所形成的量子阱,足以对电子和空穴进行限制.这些结果为我们进 相似文献