scholarly journals High Frequency Character of Piezoelectric Pump Valve

2013 ◽  
Vol 5 (24) ◽  
pp. 5521-5526 ◽  
Author(s):  
Yue Wu ◽  
Zhigang Yang ◽  
Yong Liu
Author(s):  
Jian Hui ZHANG ◽  
Qixiao XIA ◽  
Zheng HONG ◽  
TaTuO YOSHIZAWA ◽  
AkiYoShi ONUKI ◽  
...  

2017 ◽  
Vol 89 (4) ◽  
pp. 2621-2628 ◽  
Author(s):  
H. G. Liu ◽  
X. L. Liu ◽  
J. H. Yang ◽  
Miguel A. F. Sanjuán ◽  
G. Cheng

2014 ◽  
Vol 915-916 ◽  
pp. 309-312
Author(s):  
Zhi Sen Deng ◽  
Yu Ting Ma

A pulsed diaphragm piezoelectric pump using centrifugal force is introduced in this paper. It utilizes centrifugal force in the swing motion of a vibrating tube as the driving force, and to input and output liquid continuously at first bending resonant frequency. The piezoelectric pump based on this principle is expected to effectively coordinate the high frequency characteristics of piezoelectric materials and low frequency characteristics of check valves. Resonant frequency of the pump is studied. A prototype pump was fabricated and tested. Experimental results show that the pump can hold and discharge very precise volume of liquid in every pulse, and can pump tap water at a flow rate of 6.12ml/min under a backpressure of 0.3kPa.


Author(s):  
Michal Černý ◽  
Josef Filípek ◽  
Pavel Mazal

This work is divided into two parts: the theoretical part includes actual knowledge and points of view about degradation processes in construction materials, anticorrosion protection, zinc coat composition and high frequency fatigue. The laboratory part follow-up existing regulations contents Czech standards and formulate specifications for acquisition of objective information from acceleration la­bo­ra­to­ry tests in condensation chests, mechanical high frequency fatigue tests on pulsator machine and possibilities of evaluation of fatigue tests. Laboratory findings declare to fundamental types of damage of constructions with anticorrosion protection in real loading conditions with dynamic high frequency character. Laboratory tests were made in sulphide and chloride environments.


2020 ◽  
pp. 174702182097366
Author(s):  
Lei Cui ◽  
Jue Wang ◽  
Yingliang Zhang ◽  
Fengjiao Cong ◽  
Wenxin Zhang ◽  
...  

In two eye-tracking studies, reading of two-character Chinese compound words was examined. First and second character frequency were orthogonally manipulated to examine the extent to which Chinese compound words are processed via the component characters. In Experiment 1, first and second character frequency were manipulated for frequent compound words, whereas in Experiment 2 it was done for infrequent compound words. Fixation time and skipping probability for the first and second character were affected by its frequency in neither experiment, nor in their pooled analysis. Yet, in Experiment 2 fixations on the second character were longer when a high-frequency character was presented as the first character compared with when a low-frequency character was presented as the first character. This reversed character frequency effect reflects a morphological family size effect and is explained by the constraint hypothesis, according to which fixation time on the second component of two-component compound words is shorter when its identity is constrained by the first component. It is concluded that frequent Chinese compound words are processed holistically, whereas with infrequent compound words there is some room for the characters to play a role in the identification process.


Author(s):  
Э.Т. Гутиева

Теоним Донбеттыр, имя водного божества осетинского нартовского эпоса, традиционно считается примером ономастической христианизации, присвоением языческому богу имени христианского святого. В работе рассматривается гипотеза В.И. Абаева о переименовании древнего божества осетинского нартовского пантеона в честь Апостола Петра. Предлагаемые в работе альтернативные этимологии свидетельствуют не только об архаичности самого образа божества, но и позволяют полагать архаичность его имени. Постпозитивный элемент теонима *Беттыр интерпретируется через общеиндоевропейский корень со значением «отец». Главными аргументами в поддержку такого подхода можно считать высокопрецедентный характер элемента со значением «отец, родитель» среди именований божественных сущностей и фонетическое сходство между элементами. Благодаря маркированности элементом *pəter- многие верховные боги индоевропейцев оказываются связанными в одно этимологическое гнездо. Такой подход позволяет допускать ономастические связи Донбеттыра с олимпийскими богами, с верховным римским богом. Дальнейшего исследования требует презумпция о возможной фоссилизации в имени представителя нартовского пантеона протоиндоевропейской формулы, обозначавшей верховного бога и сохраненной в других древнейших эпических системах индоевропейских народов. Важным представляется рассмотрение теонимов других эпических систем, агиографической литературы, особенно в части эпитетов святых, анализ ряда этнонимов. Theonym Donbettyr, the name of the water deity of the Ossetian Nart epic, is traditionally considered an example of onomastic Christianization, assigning the name of a Christian Saint to a pagan God. The paper considers the hypothesis of V. I. Abaev about renaming the ancient God in honor of the Apostle Peter. The alternative etymologies proposed in this work indicate not only the archaic nature of the image of the deity, but also allow us to assume the archaic nature of his name also. The postpositive element of the theonym *Bettyr is interpreted through a common Indo-European root with the meaning "father". The main arguments in support of this approach can be considered the high-frequency character of the element with the meaning "father, parent" among the names of divine entities and the phonetic similarity between the elements. Marked with the element * pəter-many of the Supreme gods of the Indo-Europeans are connected in one etymological nest. This approach allows to suggest the onomastic connection of Donbettyr with the Olympic gods, with the Supreme Roman God. The presumption about the possible fossilization in the name of the representative of the Nart Pantheon of the proto-Indo-European formula requires Further research. The formula denoted the Supreme God and was preserved in other ancient epic systems of the Indo-European peoples. It is important to review the theonyms of different epic systems, hagiographic literature, especially in terms of epithets of saints, to research related ethnonyms.


2014 ◽  
Vol 680 ◽  
pp. 271-275
Author(s):  
Jing Sun ◽  
Ping Zeng ◽  
Hai Long Lu

In order to improve the output characteristics of active piezoelectric pump valve, Research on dual-chamber tandem piezoelectric pump of combination of active and passive valves is proposed, And dual-chamber tandem piezoelectric pump of combination of active and passive valves is designed and study. The results show that maximum output flow of dual-chamber tandem piezoelectric pump of combination of active and passive valves is 540ml/min, the most output pressure is 27kPa,the maximum output flow of single-cavity active valve piezoelectric pump is 160ml/min;the most output pressure is 9.8kPa, obtained the conclusion that output flow and output pressure of the dual-chamber tandem of combination of active and passive valve is superior to single chamber active valve piezoelectric pump.


Author(s):  
W. E. Lee ◽  
A. H. Heuer

IntroductionTraditional steatite ceramics, made by firing (vitrifying) hydrous magnesium silicate, have long been used as insulators for high frequency applications due to their excellent mechanical and electrical properties. Early x-ray and optical analysis of steatites showed that they were composed largely of protoenstatite (MgSiO3) in a glassy matrix. Recent studies of enstatite-containing glass ceramics have revived interest in the polymorphism of enstatite. Three polymorphs exist, two with orthorhombic and one with monoclinic symmetry (ortho, proto and clino enstatite, respectively). Steatite ceramics are of particular interest a they contain the normally unstable high-temperature polymorph, protoenstatite.Experimental3mm diameter discs cut from steatite rods (∼10” long and 0.5” dia.) were ground, polished, dimpled, and ion-thinned to electron transparency using 6KV Argon ions at a beam current of 1 x 10-3 A and a 12° angle of incidence. The discs were coated with carbon prior to TEM examination to minimize charging effects.


Author(s):  
G. Y. Fan ◽  
J. M. Cowley

It is well known that the structure information on the specimen is not always faithfully transferred through the electron microscope. Firstly, the spatial frequency spectrum is modulated by the transfer function (TF) at the focal plane. Secondly, the spectrum suffers high frequency cut-off by the aperture (or effectively damping terms such as chromatic aberration). While these do not have essential effect on imaging crystal periodicity as long as the low order Bragg spots are inside the aperture, although the contrast may be reversed, they may change the appearance of images of amorphous materials completely. Because the spectrum of amorphous materials is continuous, modulation of it emphasizes some components while weakening others. Especially the cut-off of high frequency components, which contribute to amorphous image just as strongly as low frequency components can have a fundamental effect. This can be illustrated through computer simulation. Imaging of a whitenoise object with an electron microscope without TF limitation gives Fig. 1a, which is obtained by Fourier transformation of a constant amplitude combined with random phases generated by computer.


Author(s):  
M. T. Postek ◽  
A. E. Vladar

Fully automated or semi-automated scanning electron microscopes (SEM) are now commonly used in semiconductor production and other forms of manufacturing. The industry requires that an automated instrument must be routinely capable of 5 nm resolution (or better) at 1.0 kV accelerating voltage for the measurement of nominal 0.25-0.35 micrometer semiconductor critical dimensions. Testing and proving that the instrument is performing at this level on a day-by-day basis is an industry need and concern which has been the object of a study at NIST and the fundamentals and results are discussed in this paper.In scanning electron microscopy, two of the most important instrument parameters are the size and shape of the primary electron beam and any image taken in a scanning electron microscope is the result of the sample and electron probe interaction. The low frequency changes in the video signal, collected from the sample, contains information about the larger features and the high frequency changes carry information of finer details. The sharper the image, the larger the number of high frequency components making up that image. Fast Fourier Transform (FFT) analysis of an SEM image can be employed to provide qualitiative and ultimately quantitative information regarding the SEM image quality.


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