Solutions for high-productivity high-performance coating systems

Polymer nanocomposites have advantages in mechanical, electrical, and optical properties compared to individual components. These unique properties of the nanocomposites have attracted attention in many applications, including electronics, robotics, biomedical fields, automotive industries. To achieve their high performance, it is crucial to control the orientation of nanomaterials within the polymer matrix. For example, the electric conductivity will be maximized in the ordered direction of conductive nanomaterials such as graphene and carbon nanotubes (CNTs). Conventional fabrication methods are commonly used to obtain polymer nanocomposites with the controlled alignment of nanomaterials using electric or magnetic fields, fluid flow, and shear forces. Such approaches may be complex in preparing a manufacturing system, have low fabrication rate, and even limited structure scalability and complexity required for customized functional products. Recently, additive manufacturing (AM), also called 3D printing, has been developed as a major fabrication technology for nanocomposites with aligned reinforcements. AM has the ability to control the orientation of nanoparticles and offers a great way to produce the composites with cost-efficiency, high productivity, scalability, and design flexibility. Herein, we propose a manufacturing process using AM for the architected structure of polymer nanocomposites with oriented nanomaterials using a polylactic acid polymer as the matrix and graphite and CNTs as fillers. AM can achieve the aligned orientation of the nanofillers along the printing direction. Thus, it enables the fabrication of multifunctional nanocomposites with complex shapes and higher precision, from micron to macro scale. This method will offer great opportunities in the advanced applications that require complex multiscale structures such as energy storage devices (e.g., batteries and supercapacitors) and structural electronic devices (e.g., circuits and sensors).

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Solution Blow Spun High Performance Co-Polyimide Nanofibers

Materials Science Forum ◽

10.4028/www.scientific.net/msf.898.2181 ◽

2017 ◽

Vol 898 ◽

pp. 2181-2186

Author(s):

Jing Li ◽

Jun Rong Yu ◽

Jing Zhu ◽

Yan Wang ◽

Zu Ming Hu ◽

...

Keyword(s):

Thermal Stability ◽

Tensile Property ◽

High Performance ◽

Nanofiber Membrane ◽

High Productivity ◽

Thermal Imidization ◽

Solution Blow Spinning ◽

Ft Ir ◽

Biphenyltetracarboxylic Dianhydride ◽

Thermal Stability Of

Solution blow spinning (SBS) is an innovative nanofiber fabricating method with high productivity. 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) / p-phenylenediamine (PDA) / 4,4'-oxydianiline (ODA) co-polyimide nanofiber membrane was efficiently produced by SBS followed by imidization from precursor polyamic acid (PAA) nanofiber membrane in the paper. The morphologies and structures of the obtained PAA and PI nanofiber membrane were examined by SEM and FT-IR. The effect of thermal imidization temperature on the tensile property was investigated. The thermal stability of polyimide nanofiber membrane was also characterized by TGA.

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Study on the Coating of Lost Foam Casting for Steel Casting

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.680.267 ◽

2013 ◽

Vol 680 ◽

pp. 267-270

Author(s):

Zhi Ming Liu ◽

Yan Liu ◽

De Hui Liu

Keyword(s):

Steel Casting ◽

High Performance ◽

Lost Foam Casting ◽

Sodium Bentonite ◽

Key Technology ◽

High Performance Coating ◽

Refractory Aggregate ◽

Lost Foam ◽

Optimal Formula

The coating is one key technology of lost foam casting (LFC). This paper discussed the influences of refractory aggregate contents on strength, viscosity and other performances of LFC coating, and develops a high performance coating which can meet the requirement of LFC for steel casting. The results shown that with the content of the high bauxite increasing and the content of zircon powders decreasing, the strength, permeability and attached quantity of the coating increased. The best ratio of refractory aggregate is 70% high bauxite and 30% zircon powders. The optimal formula in the experiments is 70% high bauxite, 30% zircon powders, 3% sodium bentonite, 0.5% CMC and 5% ludox. This coating has good comprehensive performances to meet the requirements of LFC steel casting.

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Hearing Reaction Time Measurement Concentration Level Tool Integrated Android Smartphone

Procedia of Engineering and Life Science ◽

10.21070/pels.v1i1.643 ◽

2021 ◽

Vol 1 (1) ◽

Author(s):

Muhamad Arif Indiarto ◽

Syamsudduha Syahrorini

Keyword(s):

Reaction Time ◽

Power Supply ◽

High Performance ◽

Concentration Level ◽

Time Measurement ◽

Push Button ◽

High Productivity ◽

Measurement Results ◽

Reaction Time Measurement ◽

Execution Speed

Performance in a job is very important because it will have an impact on the assessment and productivity of an employee, one of the indicators for evaluating high performance is related to concentration, execution speed and high productivity of the employee. Concentration is needed in working to prevent fatal accidents. In this study, it is possible to monitor measurement results via a smartphone, namely by using the Bluetooth HC-05 sensor as an integration to a smartphone. With 8 pushbutton, Arduino UNO microncontroller, Bluetooth HC-05, 16x2 LCD, and Buzzer. This tool works alternately when the push button Start is pressed, the power from the power supply will provide an electric current to the microncontroller, and continue to be connected to the Bluetooth HC-05, then by providing pushbuttons pressing input. Each pressing instruction on the pushbutton provides a different sound output, consisting of sound output, High, Mid, and Low. And continue on the LCD, and can display the results of the input that has been processed by the microcontroller. The output results are in the form of the amount of time displayed on the LCD, the sound from the buzzer, and from a series of work tools and the output results can be monitored via android smartphone. The results of this study are the accuracy of the tool in each variable low 99%, mid 90%, high 92%. The average tool ranges from 2.44. The error is low 7,4%, mid 7,4%, high 7,6%.

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Advanced UAV–WSN System for Intelligent Monitoring in Precision Agriculture

Sensors ◽

10.3390/s20030817 ◽

2020 ◽

Vol 20 (3) ◽

pp. 817 ◽

Cited By ~ 9

Author(s):

Dan Popescu ◽

Florin Stoican ◽

Grigore Stamatescu ◽

Loretta Ichim ◽

Cristian Dragana

Keyword(s):

Data Collection ◽

Data Processing ◽

Precision Agriculture ◽

High Performance ◽

New Technologies ◽

Control Analysis ◽

Online Data ◽

Monitoring Point ◽

High Productivity ◽

In Situ Data

The growing need for food worldwide requires the development of a high-performance, high-productivity, and sustainable agriculture, which implies the introduction of new technologies into monitoring activities related to control and decision-making. In this regard, this paper presents a hierarchical structure based on the collaboration between unmanned aerial vehicles (UAVs) and federated wireless sensor networks (WSNs) for crop monitoring in precision agriculture. The integration of UAVs with intelligent, ground WSNs, and IoT proved to be a robust and efficient solution for data collection, control, analysis, and decisions in such specialized applications. Key advantages lay in online data collection and relaying to a central monitoring point, while effectively managing network load and latency through optimized UAV trajectories and in situ data processing. Two important aspects of the collaboration were considered: designing the UAV trajectories for efficient data collection and implementing effective data processing algorithms (consensus and symbolic aggregate approximation) at the network level for the transmission of the relevant data. The experiments were carried out at a Romanian research institute where different crops and methods are developed. The results demonstrate that the collaborative UAV–WSN–IoT approach increases the performances in both precision agriculture and ecological agriculture.

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Novel process and catalytic materials for converting CO2 and H2 containing mixtures to liquid fuels and chemicals

Faraday Discussions ◽

10.1039/c5fd00039d ◽

2015 ◽

Vol 183 ◽

pp. 197-215 ◽

Cited By ~ 17

Author(s):

Nora Meiri ◽

Yakov Dinburg ◽

Meital Amoyal ◽

Viatcheslav Koukouliev ◽

Roxana Vidruk Nehemya ◽

...

Keyword(s):

Carbon Dioxide ◽

High Performance ◽

Reaction Rates ◽

Operating Conditions ◽

Reactor System ◽

Liquid Fuels ◽

High Productivity ◽

Carbide Phases ◽

Production Of Hydrogen ◽

Higher Hydrocarbons

Carbon dioxide and water are renewable and the most abundant feedstocks for the production of chemicals and fungible fuels. However, the current technologies for production of hydrogen from water are not competitive. Therefore, reacting carbon dioxide with hydrogen is not economically viable in the near future. Other alternatives include natural gas, biogas or biomass for the production of carbon dioxide, hydrogen and carbon monoxide mixtures that react to yield chemicals and fungible fuels. The latter process requires a high performance catalyst that enhances the reverse water-gas-shift (RWGS) reaction and Fischer–Tropsch synthesis (FTS) to higher hydrocarbons combined with an optimal reactor system. Important aspects of a novel catalyst, based on a Fe spinel and three-reactor system developed for this purpose published in our recent paper and patent, were investigated in this study. Potassium was found to be a key promoter that improves the reaction rates of the RWGS and FTS and increases the selectivity of higher hydrocarbons while producing mostly olefins. It changed the texture of the catalyst, stabilized the Fe–Al–O spinel, thus preventing decomposition into Fe3O4 and Al2O3. Potassium also increased the content of Fe5C2 while shifting Fe in the oxide and carbide phases to a more reduced state. In addition, it increased the relative exposure of carbide iron on the catalysts surface, the CO2 adsorption and the adsorption strength. A detailed kinetic model of the RWGS, FTS and methanation reactions was developed for the Fe spinel catalyst based on extensive experimental data measured over a range of operating conditions. Significant oligomerization activity of the catalyst was found. Testing the pelletized catalyst with CO2, CO and H2 mixtures over a range of operating conditions demonstrated its high productivity to higher hydrocarbons. The composition of the liquid (C5+) was found to be a function of the potassium content and the composition of the feedstock.

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