scholarly journals MEMS-Based Electrochemical Seismometer with a Sensing Unit Integrating Four Electrodes

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 699
Author(s):  
Wenjie Qi ◽  
Chao Xu ◽  
Bowen Liu ◽  
Xu She ◽  
Tian Liang ◽  
...  
Keyword(s):  
Ground Motions ◽  
Experimental Results ◽  
Glass Layer ◽  
Noise Levels ◽  
Stabilization Time ◽  
New Process ◽  
Accuracy Parameter ◽  
Peak Sensitivity ◽  
High Consistency ◽  
Four Electrodes

This paper presents a new process to fabricate a sensing unit of electrochemical seismometers using only one silicon–glass–silicon bonded wafer. By integrating four electrodes on one silicon–glass–silicon bonded wafer, the consistency of the developed sensing unit was greatly improved, benefiting from the high alignment accuracy. Parameter designs and simulations were carried out based on this sensing unit, which indicated that the sensitivities of the developed electrochemical seismometer decreased with the decrease in the number of flow holes in the sensing unit, and the initial stabilization time decreased gradually with the decrease in the thickness of the glass layer. Based on experimental results of four devices, the peak sensitivity was quantified as 5345.45 ± 43.78 V/(m/s) at 2 Hz, which proved high consistency of the fabricated electrochemical seismometer. In terms of the responses to random ground motions, high consistencies between the developed electrochemical seismometer and the commercial counterpart of CME6011 (R-sensors, Moscow, Russia) were found, where the developed electrochemical seismometer produced comparable noise levels to those of CME6011. These results validated the performance of the device and it may function as an effective tool for a variety of applications.

scholarly journals MEMS-Based Integrated Triaxial Electrochemical Seismometer

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1156
Author(s):  
Wenjie Qi ◽  
Bowen Liu ◽  
Tian Liang ◽  
Jian Chen ◽  
Deyong Chen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Ground Motion ◽  
Small Volume ◽  
Three Dimensional ◽  
Experimental Results ◽  
Good Prospect ◽  
High Symmetry ◽  
Noise Levels ◽  
Sensitivity Curves ◽  
Simulation Results

This paper presents a micro-electromechanical systems (MEMS)-based integrated triaxial electrochemical seismometer, which can detect three-dimensional vibration. By integrating three axes, the integrated triaxial electrochemical seismometer is characterized by small volume and high symmetry. The numerical simulation results inferred that the integrated triaxial electrochemical seismometer had excellent independence among three axes. Based on the experimental results, the integrated triaxial electrochemical seismometer had the advantage of small axial crosstalk and could detect vibration in arbitrary directions. Furthermore, compared with the uniaxial electrochemical seismometer, the integrated triaxial electrochemical seismometer had similar sensitivity curves ranging from 0.01 to 100 Hz. In terms of random ground motion response, high consistencies between the developed integrated triaxial electrochemical seismometer and the uniaxial electrochemical seismometer could be easily observed, which indicated that the developed integrated triaxial electrochemical seismometer produced comparable noise levels to those of the uniaxial electrochemical seismometer. These results validated the performance of the integrated triaxial electrochemical seismometer, which has a good prospect in the field of deep geophysical exploration and submarine seismic monitoring.

scholarly journals Comparasion of prediction and measurement methods for sound insulation of lightweight partitions

2012 ◽  
Vol 10 (2) ◽  
pp. 155-167 ◽  
Author(s):  
Momir Prascevic ◽  
Dragan Cvetkovic ◽  
Darko Mihajlov
Keyword(s):  
Transmission Loss ◽  
Road Traffic ◽  
Theoretical Models ◽  
Measurement Methods ◽  
Experimental Results ◽  
Sound Insulation ◽  
Acoustic Absorption ◽  
Noise Levels ◽  
Overall Design ◽  
Acoustic Comfort

It is important to know the sound insulation of partitions in order to be able to compare different constructions, calculate acoustic comfort in apartments or noise levels from outdoor sources such as road traffic, and find engineer optimum solutions to noise problems. The use of lightweight partitions as party walls between dwellings has become common because sound insulation requirements can be achieved with low overall surface weights. However, they need greater skill to design and construct, because the overall design is much more complex. It is also more difficult to predict and measure of sound transmission loss of lightweight partitions. There are various methods for predicting and measuring sound insulation of partitions and some of them will be described in this paper. Also, this paper presents a comparison of experimental results of the sound insulation of lightweight partitions with results obtained using different theoretical models for single homogenous panels and double panels with and without acoustic absorption in the cavity between the panels.

Experiment Study on Novel Precision Cropping Machinery Using Rotary Striking Action

2013 ◽  
Vol 281 ◽  
pp. 287-292 ◽  
Author(s):  
Ren Feng Zhao ◽  
Sheng Dun Zhao ◽  
Bin Zhong
Keyword(s):  
Industrial Production ◽  
Experimental Results ◽  
Control Mode ◽  
Experiment Study ◽  
New Process ◽  
Different Types ◽  
New Type ◽  
Working Principle ◽  
Process Method

This paper illuminates a new type of precision cropping process method with rotary striking action. The new process makes use of a controllable circumferential strike on a metal bar with a V-shaped notch. The working principle of the machine is described. Different types of metal bars have been tested, and both bad results and successful results were stated in the paper. The most ideal control mode has been obtained. The experimental results show that the new cropping process can crop bars with different materials and diameters. In some cases, it can be directly used in the subsequent industrial production.

Machine for the Hydrostatic Extrusion–Drawing of Wire

1972 ◽  
Vol 186 (1) ◽  
pp. 499-507
Author(s):  
H. Ll. D. Pugh ◽  
P. T. Wilkinson ◽  
M. H. Hodge
Keyword(s):  
Copper Wire ◽  
Research Work ◽  
Hydrostatic Extrusion ◽  
Experimental Results ◽  
Experimental Investigations ◽  
Small Scale ◽  
New Process ◽  
And Performance ◽  
Commercial Applications ◽  
Fine Copper

Research work on hydrostatic extrusion at N.E.L. (National Engineering Laboratory) has led to the development of a new process for producing wire. A detailed account is given of machines specially designed to exploit this process of hydrostatic extrusion–drawing mainly on the production of fine copper wire. A small-scale machine was built to confirm the design and for experimental investigations. The success of this preliminary work has led to the construction of a large prototype production machine for commercial applications. The operation and performance of both machines is described and some experimental results given.

SOUND INSULATION OF A MECHANICAL WORKSHOP

2014 ◽  
Vol 4 (2) ◽  
Author(s):  
ZORAN PETROVIĆ ◽  
BRANKO RADIČEVIĆ ◽  
MILAN KOLAREVIĆ ◽  
VLADAN GRKOVIĆ
Keyword(s):  
Theoretical Model ◽  
Key Words ◽  
Design Process ◽  
Experimental Results ◽  
Sound Insulation ◽  
Housing Estate ◽  
Noise Levels ◽  
Acoustic Insulation

The paper presents a design process related to sound insulation of a small mechanical workshop for storing eccentric presses, which is located in a densely populated housing estate. Starting from the theoretical model of acoustic insulation power of a single solid partition, a complex partition and a multi-layer partition, the acoustic insulation power of the walls and the ceiling in the workshop was determined. The results of calculation of workshop isolation coincide to a great extent with the experimental results of measuring noise levels. Key words: noise, mechanical workshop, sound insulation

Synthesis of n-Butyl Salicylate Catalyzed by Boric Acid

2012 ◽  
Vol 466-467 ◽  
pp. 319-322 ◽  
Author(s):  
Yong Jun Zheng ◽  
Ji Chang Zhang ◽  
Hui Chao Lu
Keyword(s):  
Salicylic Acid ◽  
Boric Acid ◽  
Acid Catalyst ◽  
Product Yield ◽  
Experimental Results ◽  
Process Conditions ◽  
Target Product ◽  
New Process ◽  
The Cost ◽  
Target Product Yield

Boric acid (H3BO3) was an inexpensive, efficient and mild catalyst for the synthesis of n-butyl salicylate from salicylic acid and n-butanol, the esterifcation process conditions were optimized, the experimental results showed that the new process used small amount of boric acid catalyst, got higher target product yield, thus reduced the cost of production.

An Experiment on Bond-Slip Behavior of Epoxy Coated Rebar Made by IGBT Method

2018 ◽  
Vol 382 ◽  
pp. 241-245 ◽  
Author(s):  
Jee Sang Kim ◽  
Sang Hyun Lee ◽  
Jung Wook Choi
Keyword(s):  
Bipolar Transistor ◽  
Experimental Results ◽  
New Method ◽  
Coating Process ◽  
Marine Environments ◽  
Bond Slip ◽  
Insulated Gate Bipolar Transistor ◽  
Pull Out ◽  
Bending Process ◽  
New Process

Epoxy coated reinforcements have been used extensively in bridge decks and substructures to protect against corrosion brought on by de-icing salts or marine environments. They need longer development lengths because of poor bond to concrete and special treatments on sites due to vulnerability of damage during transportation, storage and bending process. A new method of pre-heating of reinforcement before coating process using an IGBT(Insulated Gate Bipolar Transistor) control was applied to improve the bond of epoxy coating to reinforcements. In this paper, the bond-slip properties of newly developed epoxy coated bars are investigated and compared to those of black bars. The direct pull out test according to EN Standard was used with varying the diameters of reinforcements. The experimental results show that the new process is very efficient in increasing bond capacity of epoxy coated bars to concrete comparing those of traditional ones.

A Study for the Mirror Surface Polishing by Using the Ring Shaped Tool

2011 ◽  
Vol 120 ◽  
pp. 235-238
Author(s):  
Shuh Yi Wang
Keyword(s):  
Tool Wear ◽  
Experimental Results ◽  
The Other ◽  
Mirror Surface ◽  
Polishing Process ◽  
Surface Polishing ◽  
Other Hand ◽  
New Process ◽  
Machining Rate ◽  
Spherical Tool

The feasibility of mirror surface polishing by using the ring shaped tool (abbreviated as the RST) is studied. This novel polishing process is expected to apply in the fabrication of precise mold and optics. In order to reduce the tool wear effect, the semi-spherical tool was replaced by the ring shaped tool. The experimental results show that the machining rate is not affected by the tool wear, That is, this new process provides excellent machining repeatability. On the other hand, the mirror surface with Ra 4.4nm was yielded in the lager area polishing.

scholarly journals Exploring planets and asteroids with 6DoF sensors: Utopia and realism

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Felix Bernauer ◽  
Raphael F. Garcia ◽  
Naomi Murdoch ◽  
Veronique Dehant ◽  
David Sollberger ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
State Of The Art ◽  
Ground Motions ◽  
Noise Levels ◽  
Motion Sensing ◽  
History Of ◽  
Space Sciences ◽  
6 Degrees Of Freedom ◽  
Scientific Questions ◽  
Three Components

AbstractA 6 degrees-of-freedom (6DoF) sensor, measuring three components of translational acceleration and three components of rotation rate, provides the full history of motion it is exposed to. In Earth sciences 6DoF sensors have shown great potential in exploring the interior of our planet and its seismic sources. In space sciences, apart from navigation, 6DoF sensors are, up to now, only rarely used to answer scientific questions. As a first step of establishing 6DoF motion sensing deeper into space sciences, this article describes novel scientific approaches based on 6DoF motion sensing with substantial potential for constraining the interior structure of planetary objects and asteroids. Therefore we estimate 6DoF-signal levels that originate from lander–surface interactions during landing and touchdown, from a body’s rotational dynamics as well as from seismic ground motions. We discuss these signals for an exemplary set of target bodies including Dimorphos, Phobos, Europa, the Earth’s Moon and Mars and compare those to self-noise levels of state-of-the-art sensors.

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