scholarly journals Tactile Interaction Sensor with Millimeter Sensing Acuity

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4274
Author(s):  
Eunsuk Choi ◽  
Sunjin Kim ◽  
Jinsil Gong ◽  
Hyeonjeong Sun ◽  
Minjin Kwon ◽  
...  
Keyword(s):  
Shear Force ◽  
High Reliability ◽  
Normal Pressure ◽  
Low Noise ◽  
Sensing Material ◽  
High Uniformity ◽  
Tactile Interaction ◽  
Force Direction ◽  
Potential Applications ◽  
Contact Shape

In this article we report on a 3 × 3 mm tactile interaction sensor that is able to simultaneously detect pressure level, pressure distribution, and shear force direction. The sensor consists of multiple mechanical switches under a conducting diaphragm. An external stimulus is measured by the deflection of the diaphragm and the arrangement of mechanical switches, resulting in low noise, high reliability, and high uniformity. Our sensor is able to detect tactile forces as small as ~50 mgf along with the direction of the shear force. It also distinguishes whether there is a normal pressure during slip motion. We also succeed in detecting the contact shape and the contact motion, demonstrating potential applications in robotics and remote input interfaces. Since our sensor has a simple structure and its function depends only on sensor dimensions, not on an active sensing material, in comparison with previous tactile sensors, our sensor shows high uniformity and reliability for an array-type integration.

scholarly journals Research on Performance Test System of Space Harmonic Reducer in High Vacuum and Low Temperature Environment

Machines ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Jing Wang ◽  
Zhihua Wan ◽  
Zhurong Dong ◽  
Zhengguo Li
Keyword(s):  
Low Temperature ◽  
High Speed ◽  
Performance Test ◽  
High Reliability ◽  
High Vacuum ◽  
Test System ◽  
Low Noise ◽  
Speed Ratio ◽  
Space Harmonic ◽  
Temperature Environment

The harmonic reducer, with its advantages of high precision, low noise, light weight, and high speed ratio, has been widely used in aerospace solar wing deployment mechanisms, antenna pointing mechanisms, robot joints, and other precision transmission fields. Accurately predicting the performance of the harmonic reducer under various application conditions is of great significance to the high reliability and long life of the harmonic reducer. In this paper, a set of automatic harmonic reducer performance test systems is designed. By using the CANOpen bus interface to control the servo motor as the drive motor, through accurately controlling the motor speed and rotation angle, collecting the angle, torque, and current in real time, the life cycle test of space harmonic reducer was carried out in high vacuum and low temperature environment on the ground. Then, the collected data were automatically analyzed and calculated. The test data of the transmission accuracy, backlash, and transmission efficiency of the space harmonic reducer were obtained. It is proven by experiments that the performance data of the harmonic reducer in space work can be more accurately obtained by using the test system mentioned in this paper, which is convenient for further research on related lubricating materials.

POL and LDO for Harsh Environment Applications

2013 ◽  
Vol 2013 (HITEN) ◽  
pp. 000075-000081
Author(s):  
Ramesh Khanna ◽  
Srinivasan Venkataraman
Keyword(s):  
High Temperature ◽  
Oil And Gas ◽  
High Reliability ◽  
Oil And Gas Industry ◽  
Building Blocks ◽  
Low Noise ◽  
Harsh Environment ◽  
Buck Converters ◽  
Gas Industry ◽  
Component Selection

Harsh Environment approved components/ designs require high reliability as well as availability of power to meet their system needs. The paper will explore the various design constrains imposed on the high temperature designs. Down hole oil and gas industry requires high reliability components that can withstand high temperature. Discrete component selection, packaging and constrains imposed by various specification requirements to meet harsh environment approval are critical aspect of high-temp designs. High temperature PCB material, PCB layout techniques, trace characteristics are an important aspect of high-temperature PCB design and will be explored in the article. Buck Converters are the basic building blocks, but in order to meet system requirements to power FPGA's where low output voltage and high currents are required. Converter must be able to provide wider step down ratios with high transient response so buck converters are used. The paper with explore the various features of a buck-based POL converter design. Low noise forces the need for Low-dropout (LDO) Regulators that can operate at high Temperatures up to 210°C. This paper will address the power requirements to meet system needs.

Vibration Fault Analysis in Screw Compressor and Foundation

2012 ◽  
Vol 166-169 ◽  
pp. 1072-1075
Author(s):  
Ying Ming Zhou ◽  
Zhi Min Song ◽  
Hai Feng Zhao ◽  
Shu Yun Mi
Keyword(s):  
Data Acquisition ◽  
High Reliability ◽  
Treatment Plan ◽  
Low Noise ◽  
Fault Analysis ◽  
Normal Operation ◽  
Screw Compressor ◽  
Safe Operation ◽  
Main Equipment ◽  
Long Life

With the characteristics of low noise, low vibration, high reliability and long life, Screw Compressor is the indispensable main equipment which widely used in petrochemical field. The abnormal vibration of Compressor will affect normal operation of the host, lead to damage of some main parts such as Compressor and motor and at the same time it’s an unneglectable hidden trouble for equipment’s safe operation. This article takes the data acquisition of vibration and the analyses of shake for two Ammonia Refrigeration Piston Compressors, and study at the reason about shock then take the effective shockproof treatment plan. All these ensure the stable running of the facility.

Flexible solar cells based on graphene-ultrathin silicon Schottky junction

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 73202-73206 ◽  
Author(s):  
Tianpeng Jiao ◽  
Dapeng Wei ◽  
Jian Liu ◽  
Wentao Sun ◽  
Shuming Jia ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Reliability ◽  
Photovoltaic Device ◽  
Schottky Junction ◽  
Electronic Products ◽  
Potential Applications ◽  
Wearable Electronic

This work reports a flexible graphene–silicon (Gr–Si) photovoltaic device with high reliability and stability, exhibiting a promising prospect in potential applications for portable and wearable electronic products.

Preparation Of Silicon Carbide Nanofibrils From Vapor Grown Carbon Nanotubes

1995 ◽  
Vol 410 ◽  
Author(s):  
Chunming Niu ◽  
David Moy
Keyword(s):  
Carbon Nanotubes ◽  
Synthetic Approach ◽  
Direct Reaction ◽  
Matrix Composites ◽  
Commercial Scale ◽  
High Uniformity ◽  
Nanostructured Ceramic ◽  
Potential Applications ◽  
Commercial Process ◽  
Uniform Diameter

ABSTRACTSiC nanofibrils are of interest for their potential applications, particularly for the development of nanostructured ceramic (or metal) matrix composites. Methods of production of SiC nanofibrils in bulk quantity are essential for realization of these applications. We have prepared SiC nanofibrils with average diameters of 15 nm by direct reaction of carbon nanotubes with vapor phase SiO. The carbon nanotubes were prepared catalytically by decomposition of hydrocarbons in our commercial process; they are characterized by having uniform diameter of ∼10 nm and multiple graphitic carbon layers arranged concentrically around the tube axis. Total conversion of the carbon nanotubes to SiC nanofibrils was easily achieved; the resulting SiC nanofibrils were highly crystallized β-SiC, essentially free of SiC particles. The reaction between carbon nanotubes and SiO vapor was a pseudo-topotactic transformation since the macroscopic textures of the starting carbon nanotubes remained almost unchanged in the product. This synthetic approach utilizes high quality carbon nanotubes of high uniformity which are available on a commercial scale; thus applications of SiC nanofibrils in matrix composites on a commercial scale can be envisioned.

scholarly journals Multieffect Coupled Nanogenerators

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-24
Author(s):  
Yun Ji ◽  
Yuan Liu ◽  
Ya Yang
Keyword(s):  
Electronic Device ◽  
High Reliability ◽  
High Accuracy ◽  
Charge Carriers ◽  
Energy Harvesters ◽  
Available Energy ◽  
Potential Applications ◽  
Self Powered ◽  
Output Characteristics ◽  
Device Interaction

With the advent of diverse electronics, the available energy may be light, thermal, and mechanical energies. Multieffect coupled nanogenerators (NGs) exhibit strong ability to harvest ambient energy by integrating various effects comprising piezoelectricity, pyroelectricity, thermoelectricity, optoelectricity, and triboelectricity into a standalone device. Interaction of multitype effects can promote energy harvesting and conversion by modulating charge carriers’ behaviour. Multieffect coupled NGs stand for a vital group of energy harvesters, supporting the advances of an electronic device and promoting the resolution of energy crisis. The matchless versatility and high reliability of multieffect coupled NGs make them main candidates for integration in complicated arrays of the electronic device. Multieffect coupled NGs can also be employed as a variety of self-powered sensors due to their rapid response, high accuracy, and high responsivity. This article reviews the latest achievements of multieffect coupled NGs. Fundamentals mainly including basic theory and materials of interest are covered. Advanced device design and output characteristics are introduced. Potential applications are described, and future development is discussed.

scholarly journals Study of microstructure, hardness and thermal properties of Sn-Bi alloys

2021 ◽  
pp. 21-21
Author(s):  
Kristina Bozinovic ◽  
Dragan Manasijevic ◽  
Ljubisa Balanovic ◽  
Milan Gorgievski ◽  
Uros Stamenkovic ◽  
...  
Keyword(s):  
Thermal Properties ◽  
High Reliability ◽  
Low Cost ◽  
Flash Method ◽  
Thermal Interface Materials ◽  
Scanning Calorimetry ◽  
Melting Temperatures ◽  
Phase Transition Temperatures ◽  
Potential Applications ◽  
Lead Free Solders

Lead-free solders have become a main focus of the electronic industry in recent years, because of the high toxicity of lead. Alloys based on the Sn-Bi system figure as potential replacements for Sn-Pb alloys in soldering due to favorable properties and low cost. One of the main advantages of these alloys are low melting temperatures, while additional advantages include good compatibility with substrates, low process temperature, high reliability, and potential applications in conjunction with reduced graphene oxide nanosheets as thermal interface materials. In this paper, characterization of microstructural and thermal properties as well as hardness measurements of seven alloys of different Sn-Bi compositions are performed. Structural properties of the samples were analyzed using optical microscopy and scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS). Thermal conductivity of the samples was investigated using the xenon-flash method, and phase transition temperatures were measured using the differential scanning calorimetry (DSC) analysis.

A low-noise transistorized seismic amplifier

1964 ◽  
Vol 54 (1) ◽  
pp. 347-368
Author(s):  
Stamatios N. Thanos
Keyword(s):  
High Reliability ◽  
Low Noise ◽  
Ocean Bottom ◽  
Low Frequencies ◽  
Input Noise ◽  
Remote Operation ◽  
Source Impedance ◽  
Ocean Bottom Seismographs ◽  
Equivalent Input Noise ◽  
Remote Calibration

abstract The use of transistors for the amplification of fractional microvolt signals at extremely low frequencies is illustrated in the design of an amplifier developed for use in a lunar seismograph. The amplifier has an equivalent input noise voltage of 0.2 microvolts, p-p, with a source impedance of 2000 ohms and a 3 db bandwidth of 0.035 cps to 22 cps. The nominal input impedance is 1700 ohms. It is completely transistorized and performs satisfactorily over a specified temperature range of −20°C to +100°C. Low power requirements, high reliability, and capability for remote calibration and gain change make this amplifier especially suitable for any field or remote operation under extreme environmental conditions. This amplifier is presently being used in ocean bottom seismographs and magnetic variometers.

Atomic Layer Epitaxy

1990 ◽  
Vol 198 ◽  
Author(s):  
Akira Usui
Keyword(s):  
Atomic Layer ◽  
Atomic Layer Epitaxy ◽  
Selective Area Growth ◽  
Selective Area ◽  
Cycle Growth ◽  
High Uniformity ◽  
Recent Developments ◽  
Potential Applications ◽  
Fine Structures ◽  
Order Structures

ABSTRACTAtomic layer epitaxy(ALE) of III-V compound semiconductors is reviewed. This technology has grown in recent years because of potential applications to nanometer-order structures as well as to monolayer/cycle growth with high-uniformity in growth thickness, and to excellent selective-area growth. Recent developments in chloride ALE of various compounds and heterostructures are described. Potentials of ALE for producing such fine structures are shown.

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