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Dynamic behavior of micro-diaphragms and its characterized description

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Science china(physics,Mechanics & Astronomy) 2009年第8期52卷 1345-1356页

作者： ge lifeng School of Electronic Science and Technology, anhui university, hefei 230039, china 1. School of Electronic Science and Technology Anhui University Hefei 230039 China

Diaphragm structures with micron scale play a significant role in microtransducers and micro-nano devices, and the performance of these devices depends mainly on the dynamic behaviour of diaphragms. Micro-diaphragms are treated commonly as membranes and in some cases as plates or plates in tension (called TD plates for short), but they also show in many cases the behaviour of plates in tension and supported by air spring (called TDK plates for short). Therefore, it is necessary to perform systematic research on the dynamic behaviour of micro-diaphragms, and establish a characterized mathematical description. This paper focuses on the TDK plates since they possess universality, gives the corresponding basic equations, and then derives analytical solutions of TDK circular plates under clamped and simply supported boundary conditions. This paper also gives a 3D plot representation of characteristic curved surfaces, revealing the transition from the TDK and TD plate to the pure plate or pure membrane behaviour; and further uses the value φ to determine the property of diaphragms. Its two extreme cases, i.e. φ = 0 and φ = ∞ , correspond to pure plate or pure membrane, respectively. Thus, membrane, plate and TD plate can be treated as special cases of TDK plate. In addition, this paper reveals that the presence of air-spring not only enhances the restoring force of diaphragm such that increases its natural frequencies, but also results in the resonance of a dynamic system consisting of diaphragm and air-spring. These analytical and computational results are significant for the understanding of the operation mechanism of capacitive microtransducers and their optimized design.

关键词： micro-diaphragm membrane and plate TD plate and TDK plate dynamic behaviour characterized description

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The dynamic properties of the two-level entangled atom in an optical field

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原子与分子物理学报 2003年第1期20卷 29-35页

作者： CAO Zhuo-liang, HUANG Ting,YU Ben-li (department of physics, anhui university, hefei 230039) department of physics Anhui University Hefei 230039

The interaction of an optical field and one of the entangled atoms is analyzed in detail in this paper. Furthermore, the dynamic properties of the two-level entangled atom are manifested. The properties of the action are dependent on the initial state of the atom. After detecting the atom out of the field, we can obtain the state of the other atom moving in the field. It is shown that the state of the atom out of the field influences the dynamic properties of the atom in the field.

关键词：原子物理学光谱分析原子纠缠态动力学

Squeezing enhancement in the Jaynes-Cummings model via selective atomic measurements

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原子与分子物理学报 2000年第3期17卷 390-394页

作者： YE Liu (department of physics, anhui university, hefei 230039 Open Research Laboratory for Quantum Communication and Quantum Computation, university of Science and Technology of china, hefei 230026) 安徽大学量子通信与量子计算开放实验室安徽合肥 230039

We study the model in which one of two entangled atoms interacts with a single mode cavity field based on the Jaynes Cummings model. Through measurement on the atom, the entanglement swapping can occur. It is proved... 详细信息

关键词： entangled state Jaynes Cummings model squeezing

Free Volume Changes in γ-Irradiated Polyethylene and Polytetraflourethylene

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Journal of Materials Science & Technology 2000年第3期16卷 302-304页

作者： Xianyi ZHOU (Dept. of Modern physics, university of Science and Technology of china, hefei 230027, china) Linhua ZHAI (department of physics, anhui Normal university, Wuhu 241000, china) Jiangfeng DU and Rongdian HAN (department of Modern physics, Univers department of Modern physics University of Science and Technology of China Hefei 230027 China department of physics Anhui Normal University Wuhu 241000 China

Positron lifetime spectrum was measured and the change of the free volume was studied for commercial polyethylene (PE) and polytetrafluoroethylene (PTFE) during 7-irradiation processing up to 265 kGy. The free volume size increases but the crystallinity decreases as irradiation dose increases in PE. Both qualities (free volume size and crystallinity) in PTFE display an opposite behavior. The fractional free volume reduces monotonically with increasing irradiation dose in both PE and PTFE. The competition between the crosslinkmg and the splitting decomposition in polymers can be used to understand the free volume changes with irradiation dose.

关键词： PTFE Irradiated Polyethylene and Polytetraflourethylene

LOW ENERGY TRIPLE DIFFERENTIAL CROSS SECTIONS FOR ELECTRON IMPACT IONIZATION OF HYDROgeN

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原子与分子物理学报 1998年第3期 25-29页

作者： Chen Zhangjin a,b Xu Kezun b Xu Fuxin aa department of physics, anhui Unviersity hefei 230039 b department of Modern physics, university of Science and Technology of china hefei 230027

ＬＯＷＥＮＥＲＧＹＴＲＩＰＬＥＤＩＦＦＥＲＥＮＴＩＡＬＣＲＯＳＳＳＥＣＴＩＯＮＳＦＯＲＥＬＥＣＴＲＯＮＩＭＰＡＣＴＩＯＮＩＺＡＴＩＯＮＯＦＨＹＤＲＯＧＥＮＣｈｅｎＺｈａｎｇｊｉｎａ，ｂＸｕＫｅｚｕｎｂＸｕＦｕｘｉｎ... 详细信息

ＬＯＷＥＮＥＲＧＹＴＲＩＰＬＥＤＩＦＦＥＲＥＮＴＩＡＬＣＲＯＳＳＳＥＣＴＩＯＮＳＦＯＲＥＬＥＣＴＲＯＮＩＭＰＡＣＴＩＯＮＩＺＡＴＩＯＮＯＦＨＹＤＲＯＧＥＮＣｈｅｎＺｈａｎｇｊｉｎａ，ｂＸｕＫｅｚｕｎｂＸｕＦｕｘｉｎａａＤｅｐａｒｔｍｅｎｔｏｆＰｈｙ...

关键词： Electron impact ionization Triple differential cross section BBK DS3C

The emission properties of an atom inside a cavity when manipulating the atoms outside the cavity

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原子与分子物理学报 2003年第4期20卷 511-517页

作者： ZHANG Wen, YE Liu,XIONG Kuang-wei, ZHANG Jin(department of physics, anhui university, hefei 230039,P. R. china) department of physics Anhui University Hefei

Considering three two-level atoms initially in the GHZ state, then one atom of them is put into an initially empty cavity and made resonant interaction. It is shown that the emission properties of the atom inside the cavity can be affected only when both of the atoms outside the cavity have been manipulated. This conclusion can also be generalized to n two-level atoms.

关键词：纠缠态旋转操作压缩密度算符原子物理学腔内原子发射性质

ELECTRON IMPACT IONIZATION OF A HYDROgeNIC ION AT INTERMEDIATE AND LOW ENERGIES

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原子与分子物理学报 1999年第2期 3-5页

作者： CHEN Zhangjin a,b ,XU Kezun b( a department of physics, anhui university hefei 230039) ( b Laboratory on the Electron Collision Spectroscopy, university of Science and Technology of china, hefei 230027)

１ＩＮＴＲＯＤＵＣＴＩＯＮＥｌｅｃｔｒｏｎｃｏｌｉｓｉｏｎｗｉｔｈａｔｏｍｓａｎｄｉｏｎｓｐｌａｙｓａｐｒｏｍｉｎｅｎｔｒｏｌｅｆｏｒｔｈｅｄｉａｇｎｏｓｔｉｃｏｆｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｐｌａｓｍａｏｃｕｒ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＥｌｅｃｔｒｏｎｃｏｌｉｓｉｏｎｗｉｔｈａｔｏｍｓａｎｄｉｏｎｓｐｌａｙｓａｐｒｏｍｉｎｅｎｔｒｏｌｅｆｏｒｔｈｅｄｉａｇｎｏｓｔｉｃｏｆｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｐｌａｓｍａｏｃｕｒｉｎｇｎａｔｕｒａｌｙｉｎｓｔａｒ...

关键词： Electron impact ionization Triple differential cross section He +

Polymeric piezoelectric accelerometers with high sensitivity,broad bandwidth,and low noise density for organic electronics and wearable microsystems

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Microsystems & Nanoengineering 2024年第3期10卷 63-74页

作者： Chang ge Edmond Cretu The department of Electrical and Computer Engineering The University of British ColumbiaVancouverBCCanada

Piezoelectric accelerometers excel in vibration *** the emerging trend of fully organic electronic microsystems,polymeric piezoelectric accelerometers can be used as vital front-end components to capture dynamic signals,such as vocal vibrations in wearable speaking assistants for those with speaking ***,high-performance polymeric piezoelectric accelerometers suitable for such applications are *** organic compounds such as PVDF have inferior properties to their inorganic counterparts such as ***,most existing polymeric piezoelectric accelerometers have very unbalanced performance *** often sacrifice resonance frequency and bandwidth for a flat-band sensitivity comparable to those of PZT-based accelerometers,leading to increased noise density and limited application *** this study,a new polymeric piezoelectric accelerometer design to overcome the material limitations of PVDF is *** new design aims to simultaneously achieve high sensitivity,broad bandwidth,and low *** samples were manufactured and characterized,demonstrating an average sensitivity of 29.45 pC/g within a±10 g input range,a 5%flat band of 160 Hz,and an in-band noise density of 1.4μg/√*** results surpass those of many PZT-based piezoelectric accelerometers,showing the feasibility of achieving comprehensively high performance in polymeric piezoelectric accelerometers to increase their potential in novel applications such as organic microsystems.

关键词： piezoelectric polymeric overcome

Epidemic dynamics on complex networks

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Progress in Natural Science:Materials International 2006年第5期16卷 452-457页

作者： ZHOU Tao , FU Zhongqian, and WANG Binghong (department of Electronic Science and Technology, university of Science and Technology of china, hefei 230026, china department of Modern physics, university of Science and Technology of china, hefei 230026, china) [a]department of Electronic Science and Technology University of Science and Technology of China Hefei China

Recently, motivated by the pioneer work in revealing the small-world effect and scale-free property of various real-life networks, many scientists devote themselves to studying complex networks. One of the ultimate goals is to understand how the topological structures affect the dynamics upon networks. In this paper, we give a brief review on the studies of epidemic dynamics on complex networks, including the description of classical epidemic models, the epidemic spread on small-world and scale-free networks, and network immunization. Finally, perspectives and some interesting problems are proposed.

关键词： epidemic dynamics complex networks critical value immunization small-world effect scale-free property.