scholarly journals Laser sintering and post-processing of a walnut shell/Co-PES composite

RSC Advances ◽  
2017 ◽  
Vol 7 (37) ◽  
pp. 23176-23181 ◽  
Author(s):  
Yueqiang Yu ◽  
Yanling Guo ◽  
Ting Jiang ◽  
Kaiyi Jiang ◽  
Jian Li ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Low Cost ◽  
Laser Sintering ◽  
Walnut Shell ◽  
Sintering Process ◽  
Post Processing ◽  
Cost Of Materials ◽  
The Cost

In order to recycle agricultural and forestry waste and reduce the cost of materials and energy consumption of the laser sintering process, herein, a sustainable and low-cost walnut shell/Co-PES composite (WSPC) is developed.

Research on Surface Quality Enhancement of Wood-Plastic Composite Powder SLS Parts by Post Processing

2010 ◽  
Vol 113-116 ◽  
pp. 508-511 ◽  
Author(s):  
Wei Liang Zeng ◽  
Yan Ling Guo
Keyword(s):  
Surface Quality ◽  
Low Cost ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Wood Plastic Composite ◽  
Post Processing ◽  
Plastic Composite ◽  
Rp Process ◽  
Sintering Properties

According to its advantages, such as low-cost and green biological etc., Wood-Plastic Composite(WPC) is more suitable for make parts by Selective Laser Sintering(SLS) rapid prototyping (RP) process. With optimal design of components, the parts made by WPC have good mechanical properties as well as with good laser sintering properties. In order to further improve the surface quality of the parts, the post-processing–infiltrating with wax–is introduced. After post-processing, the void fraction is decreased from 51% to 7%, surface quality has been greatly improved, Ra belows 13µm on average, after polishing the surface is more smooth and Ra belows 5µm averagely，compared to those without post processing, surface roughness decrease 22% and 73% respectively.

scholarly journals Selective Laser Sintering (SLS) and Post-Processing of Prosopis Chilensis/Polyethersulfone Composite (PCPC)

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3034
Author(s):  
Aboubaker I. B. Idriss ◽  
Jian Li ◽  
Yangwei Wang ◽  
Yanling Guo ◽  
Elkhawad A. Elfaki ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Particle Distribution ◽  
Low Cost ◽  
Selective Laser Sintering ◽  
Single Layer ◽  
Dimensional Accuracy ◽  
Laser Sintering ◽  
Raw Material ◽  
Post Processing ◽  
Prosopis Chilensis

The range of selective laser sintering (SLS) materials is currently limited, and the available materials are often of high cost. Moreover, the mechanical strength of wood–plastic SLS parts is low, which restricts the application of a SLS technology. A new composite material has been proposed to address these issues, while simultaneously valorizing agricultural and forestry waste. This composite presents several advantages, including reduced pollution associated with waste disposal and reduced CO2 emission with the SLS process in addition to good mechanical strength. In this article, a novel and low-cost Prosopis chilensis/polyethersulfone composite (PCPC) was used as a primary material for SLS. The formability of PCPC with various raw material ratios was investigated via single-layer experiments, while the mechanical properties and dimensional accuracy of the parts produced using the various PCPC ratios were evaluated. Further, the microstructure and particle distribution in the PCPC pieces were examined using scanning electron microscopy. The result showed that the SLS part produced via 10/90 (wt/wt) PCPC exhibited the best mechanical strength and forming quality compared to other ratios and pure polyethersulfone (PES), where bending and tensile strengths of 10.78 and 4.94 MPa were measured. To improve the mechanical strength, post-processing infiltration was used and the PCPC-waxed parts were enhanced to 12.38 MPa and 5.73 MPa for bending and tensile strength.

Application of Polymer Plaster Composites in Additive Manufacturing of High-Strength Components

2015 ◽  
Vol 825-826 ◽  
pp. 763-770 ◽  
Author(s):  
Stefan Junk ◽  
Rebecca Matt
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Low Cost ◽  
New Technology ◽  
High Strength ◽  
Testing Specimen ◽  
Whole Process ◽  
Infiltration Technique ◽  
Cost Of Materials ◽  
The Cost

Today, 3D-printing with polymer plaster composites is a common method in Additive Manufacturing. This technique has proven to be especially suitable for the production of presentation models, due to the low cost of materials and the possibility to produce color-models. But nowadays it requires refinishing through the manual application of a layer of resin. However, the strength of these printed components is very limited, as the applied resin only penetrates a thin edge layer on the surface. This paper develops a new infiltration technique that allows for a significant increase in the strength of the 3D-printed component. For this process, the components are first dehydrated in a controlled two-tier procedure, before they are then penetrated with high-strength resin. The infiltrate used in this process differs significantly from materials traditionally used for infiltration. The result is an almost complete penetration of the components with high-strength infiltrate. As the whole process is computer-integrated, the results are also easier to reproduce, compared to manual infiltration. On the basis of extensive material testing with different testing specimen and testing methods, it can be demonstrated that a significant increase in strength and hardness can be achieved. Finally, this paper also considers the cost and energy consumption of this new infiltration method. As a result of this new technology, the scope of applicability of 3D-printing can be extended to cases that require significantly more strength, like the production of tools for the shaping of metals or used for the molding of plastics. Furthermore, both the process itself and the parameters used are monitored and can be optimized to individual requirements and different fields of application.

Pretreatment of Herbicides Production Wastewater by Spherical Micro-Electrolysis Media

2013 ◽  
Vol 295-298 ◽  
pp. 1079-1083 ◽  
Author(s):  
Ling Zhang ◽  
Jing Liang Xie
Keyword(s):  
Reaction Time ◽  
Biological Treatment ◽  
Low Cost ◽  
Good Effect ◽  
Post Processing ◽  
Reaction Conditions ◽  
Effects Of Ph ◽  
Optimum Reaction ◽  
The Cost ◽  
Operation Cost

[Objective] The aim is to study the pretreatment effect of herbicides production wastewater by spherical micro-electrolysis media. [Method] Spherical micro-electrolysis media is preferred for the pretreatment of herbicides production wastewater and effects of PH, amount of media and reaction time on the pretreatment was investigated. The change of pre- and post-processing herbicides production wastewater was determined; the operation cost was also analyzed. [Result]The optimum reaction conditions are as follows: the PH was 3; the amount of media was 1.0kg/L wastewater; and the reaction time was 3.0h. Under the optimum reaction conditions, the removal of COD, Chromaticity and TP reached 26.3%, 86.4% and 95.6% respectively; BOD5/COD varied from 0.10 to 0.35, and the biodegradability was improved greatly; the cost of pretreatment was 1.0yuan/t, and it was lower than that of electrolysis. [Conclusion] The pretreatment of herbicides production wastewater by spherical micro-electrolysis media has good effect, low cost and no soiling hardening, so it provides a good foundation for subsequent biological treatment.

scholarly journals Automated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements

2021 ◽  
Vol 13 (22) ◽  
pp. 4585
Author(s):  
Cristobal Garrido ◽  
Felipe Toledo ◽  
Marcos Diaz ◽  
Roberto Rondanelli
Keyword(s):  
Temporal Resolution ◽  
Low Cost ◽  
Calibration Transfer ◽  
Calibration Uncertainty ◽  
Global Coverage ◽  
Sun Photometer ◽  
Cost Of Materials ◽  
The Cost ◽  
The City ◽  
Lower Temporal Resolution

We propose a monochromatic low-cost automatic sun photometer (LoCo-ASP) to perform distributed aerosol optical depth (AOD) measurements at the city scale. This kind of network could fill the gap between current automatic ground instruments—with good temporal resolution and accuracy, but few devices per city and satellite products—with global coverage, but lower temporal resolution and accuracy-. As a first approach, we consider a single equivalent wavelength around 408 nm. The cost of materials for the instrument is around 220 dollars. Moreover, we propose a calibration transfer for a pattern instrument, and estimate the uncertainties for several units and due to the internal differences and the calibration process. We achieve a max MAE of 0.026 for 38 sensors at 408 nm compared with AERONET Cimel; a mean standard deviation of 0.0062 among our entire sensor for measurement and a calibration uncertainty of 0.01. Finally, we perform city-scale measurements to show the dynamics of AOD. Our instrument can measure unsupervised, with an expected error for AOD between 0.02 and 0.03.

scholarly journals Battery-Powered Portable Rotary Real-Time Fluorescent qPCR with Low Energy Consumption, Low Cost, and High Throughput

Biosensors ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 49
Author(s):  
Limin He ◽  
Benliang Sang ◽  
Wenming Wu
Keyword(s):  
Energy Consumption ◽  
Real Time ◽  
Low Cost ◽  
Average Power ◽  
Pcr Amplification ◽  
Melting Curves ◽  
Average Power Consumption ◽  
The Stability ◽  
Rotary Structure ◽  
The Cost

The traditional qPCR instrument is bulky, expensive, and inconvenient to carry, so we report a portable rotary real-time fluorescent PCR (polymerase chain reaction) that completes the PCR amplification of DNA in the field, and the reaction can be observed in real-time. Through the analysis of a target gene, namely pGEM-3Zf (+), the gradient amplification and melting curves are compared to commercial devices. The results confirm the stability of our device. This is the first use of a mechanical rotary structure to achieve gradient amplification curves and melting curves comparable to commercial instruments. The average power consumption of our system is about 7.6 W, which is the lowest energy consumption for real-time fluorescence quantification in shunting PCR and enables the use of our device in the field thanks to its self-contained power supply based on a lithium battery. In addition, all of the equipment costs only about 710 dollars, which is far lower than the cost of a commercial PCR instrument because the control system through mechanical displacement replaces the traditional TEC (thermoelectric cooler) temperature control. Moreover, the equipment has a low technical barrier, which can suit the needs of non-professional settings, with strong repeatability.

Study on Mechanical Properties Enhancement of Post Processing WPC Powder Selective Laser Sintering Parts

2010 ◽  
Vol 113-116 ◽  
pp. 1845-1848 ◽  
Author(s):  
Wei Liang Zeng ◽  
Yan Ling Guo ◽  
Zong Sheng Xin ◽  
Kai Yi Jiang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Strength ◽  
Bending Strength ◽  
Low Cost ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Post Processing ◽  
Plastic Composite ◽  
Rp Process

In this paper, Wood-Plastic Composite(WPC) is successfully developed to make parts by Selective Laser Sintering(SLS) rapid prototyping (RP) process according to its advantages, such as green biological, wood texture and recycled, but the most important advantage is low-cost. With optimal design of components, the parts made by WPC have good mechanical properties as well as with good laser sintering properties. In order to further improve the mechanical properties of the parts, the post-processing–infiltrating with wax–is introduced. Through post-processing, the void fraction is decreased from from 51% to 7%, the mechanical properties are significantly improved, the average tensile strength, bending strength, impact strength are 1.214 MPa, 2.73 MPa and 1.4125 kJ/m2, compared with those without post processing, the tensile strength is 87 times, the bending strength is 4.7 times and impact strength is 2.5 times, respectively.

scholarly journals Solar concentrators manufacture and automation

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 93-103
Author(s):  
Ernst Kussul ◽  
Tetyana Baydyk ◽  
Alberto Escalante Estrada ◽  
Maria Teresa Rodríguez González ◽  
Donald Wunsch II
Keyword(s):  
Solar Energy ◽  
Production Systems ◽  
Low Cost ◽  
Solar Concentrators ◽  
Energy Devices ◽  
Automated Technology ◽  
Parabolic Dish ◽  
Cost Of Materials ◽  
The Cost ◽  
Energy Plants

Abstract Solar energy is one of the most promising types of renewable energy. Flat facet solar concentrators were proposed to decrease the cost of materials needed for production. They used small flat mirrors for approximation of parabolic dish surface. The first prototype of flat facet solar concentrators was made in Australia in 1982. Later various prototypes of flat facet solar concentrators were proposed. It was shown that the cost of materials for these prototypes is much lower than the material cost of conventional parabolic dish solar concentrators. To obtain the overall low cost of flat facet concentrators it is necessary to develop fully automated technology of manufacturing and assembling processes. Unfortunately, the design of known flat facet concentrators is too complex for automation process. At present we develop the automatic manufacturing and assembling system for flat facet solar concentrators. For this purpose, we propose the design of flat facet solar concentrator that is convenient for automatization. We describe this design in the paper. At present, almost all solar-energy plants in the world occupy specific areas that are not used for agricultural production. This leads to a competition between the solar-energy plants and agriculture production systems. To avoid this competition, it is possible to co-locate solar-energy devices in agricultural fields. The energy obtained via such co-location can be used for agricultural needs (e.g., water extraction for irrigation) and other purposes (e.g., sent to an electrical grid). In this study, we also describe the results of an investigation on co-location methods for the minimal loss of agricultural harvest too.

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