Search results

This research has established 9 array elements with similar electro-acoustic characteristics which are completed by assembling a 3x3 array based on a specific fabrication technology, and have been tested for electro-acoustic characteristics in air and for transmitting and receiving as well as directivity properties underwater.
The admittance amplitude curve for different array elements measured in air is shown in Fig. 2.2 while Fig. 2.3 shows the comparison of the values of mechanical quality factor Qm.
Wire soldering: remove the residues from the surfaces of array elements after they are roughened, and then conduct wire soldering, but the soldering time must be controlled during soldering to avoid over-temperature that affects the performance of piezoelectric ceramics.
We have tested the first-order resonance frequency and equivalent parameters to the array in air and tested the transmitting, receiving and directivity properties in anechoic water-tank.
Mechanical Impedance Modeling/analysis of Structures [D].

The slips on packer play an important role on supporting packer and locking rubber tube after they have been anchored, and their performance directly affects the oil yield and production safety.
In order to grasp failure causes and influencing factors of slips packer and casing accurately, and improve their effectiveness, it is quite necessary to analyze their stress status under working conditions.
The contact between slip and casing inner wall is defined as general contact, its property is penalty function with the friction coefficient is 0.15; the contact between slip and upper cone body is defined as the surface-to-surface contact without friction.
Li, Mechanical analysis of tubing string in fracturing operation, The Open Petroleum Engineering Journal. 6 (2013) 12 - 24

By utilizing buckling, which is a phenomenon that a structure under loading becomes unstable resulting in a sudden change in its shape, it may be possible to realize novel nanoscale devices that convert mechanical input to some different forms of output (i.e. the abovementioned functional aspects).
To investigate the mechanical properties and deformation behavior of nanostructured materials, atomistic modeling simulations such as molecular dynamics (MD) are usually employed.
The localization of the instability mode vectors implies that the nanotube loses mechanical stiffness in the vicinity of the Stone-Wales defect under a large compressive stress.
Since these factors are likely to affect the behavior of instability modes, further analyses are under way for more in-depth understanding of the buckling mechanism.

The phenomenon of rain-wind-induced vibration has been simplified abstractly based on the way of theoretical analysis , and the mechanical model is established .
The relationship between the system parameters and the amplitude of the cable . 1) Fig8 shows : the cable structure amplitude increases with the increase of the density ratio , which presents nonlinear characteristic , this illustrates density is one of the influence factors of the cable structure amplitude , the cable,s density unchanged in the completed cable structure of the cable-stayed bridge , and the rivulet,s density will be affected by the natural environment factors , such as rain and wind .
Now there is no good way to control the cable,s vibration by control the density ratio of the rivulet and the cable . 2) In fig 9 , the viscosity coefficient between the cable and the rivulet is also one of the key factors of the cable structure amplitude .
Then analysis the effect of density ratio , viscosity and other parameters on the cable amplitude , and obtain these parameters are the key factors of the cable amplitude under rain-wind-induced vibration
[2] Kingsbury N.A dual—tree complex wavelet transform with improved Orthogonally and symmetry properties[J].

In recent years, compared with LCD, OLED flat-panel display and plasma display, the advantages of flexible displays have become increasingly prominent, because of its ultra-thin, light weight, durable, large storage capacity, the design freedom, crooked, winded and impact resistance and other properties[1-2].
The processing quality and precision of ultra-thin stainless steel will directly affect the performance of the device [8].
Chemical mechanical polishing (CMP) has been considered as a practical and irreplaceable planarization technology in IC manufacturing.
The passivation film is very thin [16] and is easy to be removed by the abrasive in chemical mechanical polishing.
Influencing factors on etching rates of stainless steel[J].

Cao electrospun PLA superfine fibers from solution and characterized the mechanical properties of the fibers [2].
The solution electrospun superfine fibers, which have holes in the surface, exhibit low mechanical property compare with melt electrospun fibers.
The low mechanical property limits their utility in some applications.
So many people study the melt electrospinning to get PLA fibers of high mechanical property.
Yang, Orthogonal design study on factors effecting on fibers diameter of melt electrospinning, J.

Standard procedures for light optical microscopy (LOM) typically include cutting, mounting in resin, mechanical grinding, and polishing.
Confocal laser scanning microscopy (CLSM) improves lateral resolution by a factor of ~1.5 through optical sectioning and image reconstruction [2].
However, despite AI's potential, a comprehensive approach remains necessary—from sample preparation to image acquisition—since the quality and diversity of input data directly affect the accuracy of results [6].
This process resulted in optimal mechanical properties and the highest retained austenite content.
This was followed by mechanical polishing with Struers DP-P diamond pastes of 3, 1, and 0.25 μm grain sizes.

Systems and products whose behaviour is not affected by this area of uncertainty are called robust [6].
The line graph represents the functional performance f of a system depending on influencing factors.
Developing resilient systems, the scientific approach is affected significantly by the systems complexity.
In general forces are transferred by mechanical parts.
It causes a torque and can change the load transmitting properties of the guidance element by increasing or decreasing the friction force in the joint.

Introduction Currently, composite materials that combine the properties of the resin and sorbent began to find use in wastewater treatment technology.
Nature and properties of the sorbent, the nature and charge of groups of organic ions are essential for the adsorption of organic ions .
We have identified the main physical and chemical properties of the test oil waste.
Stotsky, Abiotic factors affecting the toxicity of lead to fundi, J.
Kuzmina, Study of links between physical and chemical properties of industrial wastewater and methods of cleaning, J.

The challenge is that in many surfacing processes, in addition to mechanical loading, material removal is often affected by other factors, such as chemical reaction when polishing/grinding fluid is applied, and electric, magnetic and electronic effects when a physical field is used to assist the processing of a silicon component.
In addition, the compounds formed at different Pmax clearly have different mechanical properties (e.g., varied elastic moduli).
The gradient of the loading curve in water becomes higher, indicating that the mechanical properties of silicon have been changed due to the existence of water in the first indentation cycle.
The above constitutive modelling is preliminary, because it does not include quite a number of influential factors such as loading rate, chemical reaction and anisotropy.
In-depth studies integrating with these production factors will be of significant value.