Cost‐effective dual‐polarised leaky‐wave antennas enabled by three‐dimensional printing

2017 ◽  
Vol 11 (14) ◽  
pp. 1985-1991 ◽  
Author(s):  
Maria García‐Vigueras ◽  
Esteban Menargues ◽  
Tomislav Debogovic ◽  
Emile Rijk ◽  
Juan Ramon Mosig
Keyword(s):  
Three Dimensional ◽  
Cost Effective ◽  
Leaky Wave ◽  
Three Dimensional Printing ◽  
Dimensional Printing

scholarly journals Advances and innovations in total hip arthroplasty

SICOT-J ◽  
2021 ◽  
Vol 7 ◽  
pp. 26
Author(s):  
Andreas Fontalis ◽  
Jean-Alain Epinette ◽  
Martin Thaler ◽  
Luigi Zagra ◽  
Vikas Khanduja ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Three Dimensional ◽  
Young Patients ◽  
Cost Effective ◽  
Patient Specific ◽  
Three Dimensional Printing ◽  
Total Hip ◽  
Patient Specific Instrumentation ◽  
Dimensional Printing

Total hip arthroplasty (THA) has been quoted as one of the most successful and cost-effective procedures in Orthopaedics. The last decade has seen an exponential rise in the number of THAs performed globally and a sharp increase in the percentage of young patients hoping to improve their quality of life and return to physically demanding activities. Hence, it is imperative to review the various applications of technology in total hip arthroplasty for improving outcomes. The development of state-of-the-art robotic technology has enabled more reproducible and accurate acetabular positioning, while long-term data are needed to assess its cost-effectiveness. This opinion piece aims to outline and present the advances and innovations in total hip arthroplasty, from virtual reality and three-dimensional printing to patient-specific instrumentation and dual mobility bearings. This illustrates and reflects the debate that will be at the centre of hip surgery for the next decade.

scholarly journals OPTIMISATION OF A RESIN-COATED CHROMITE SAND FOR RAPID SAND CASTING APPLICATIONS

2021 ◽  
Vol 32 (3) ◽  
pp. 290-298
Author(s):  
Neo Tshabalala ◽  
Kasongo Nyembwe ◽  
Malan Van Tonder
Keyword(s):  
Three Dimensional ◽  
Chemical Properties ◽  
Cost Effective ◽  
Sand Casting ◽  
Raw Material ◽  
Silica Sand ◽  
Three Dimensional Printing ◽  
Physical And Chemical ◽  
Dimensional Printing ◽  
And Chemical Properties

Applications of three-dimensional printing (3DP) to sand casting have been well-established in the last two decades. The preferred raw material is silica (quartz) sand, as it is the most readily available and cost effective sand. However, silica sand as a refractory material has some technical limitations, including high thermal linear expansion, low refractoriness, and thermal conductivity. Therefore, it is not suitable for all castings. Other refractory sand types are available, including chromite sand, which is abundantly available in South Africa. Analysis of the physical and chemical properties of in-laboratory coating of a locally available chromite sand was conducted through known metal foundry tests that provide an understanding of the quality and suitability of the use of chromite sand as a potential substitute for silica material for rapid sand-casting applications. The results of this study will inform the industry about the optimisation of parameters for the manufacturing of a resin-coated chromite sand and its use in additive manufacturing using a Voxeljet VX 1000 printer.

Classification of challenges in 3D printing for combined electrochemical and microfluidic applications: a review

2019 ◽  
Vol 25 (7) ◽  
pp. 1328-1346 ◽  
Author(s):  
Arivarasi A. ◽  
Anand Kumar
Keyword(s):  
Manufacturing Sector ◽  
Three Dimensional ◽  
Cost Effective ◽  
Scientific Output ◽  
Integrated Process ◽  
Content Type ◽  
Three Dimensional Printing ◽  
Cost Effective Approach ◽  
Dimensional Printing ◽  
Process Material

Purpose The purpose of this paper is to describe, review, classify and analyze the current challenges in three-dimensional printing processes for combined electrochemical and microfluidic fabrication areas, which include printing devices and sensors in specified areas. Design/methodology/approach A systematic review of the literature focusing on existing challenges is carried out. Focused toward sensors and devices in electrochemical and microfluidic areas, the challenges are oriented for a discussion exploring the suitability of printing varied geometries in an accurate manner. Classifications on challenges are based on four key categories such as process, material, size and application as the printer designs are mostly based on these parameters. Findings A key three-dimensional printing process methodologies have their unique advantages compared to conventional printing methods, still having the challenges to be addressed, in terms of parameters such as cost, performance, speed, quality, accuracy and resolution. Three-dimensional printing is yet to be applied for consumer usable products, which will boost the manufacturing sector. To be specific, the resolution of printing in desktop printers needs improvement. Printing scientific products are halted with prototyping stages. Challenges in three-dimensional printing sensors and devices have to be addressed by forming integrated processes. Research limitations/implications The research is underway to define an integrated process-based on three-dimensional Printing. The detailed technical details are not shared for scientific output. The literature is focused to define the challenges. Practical implications The research can provide ideas to business on innovative designs. Research studies have scope for improvement ideas. Social implications Review is focused on to have an integrated three-dimensional printer combining processes. This is a cost-oriented approach saving much of space reducing complexity. Originality/value To date, no other publication reviews the varied three-dimensional printing challenges by classifying according to process, material, size and application aspects. Study on resolution based data is performed and analyzed for improvements. Addressing the challenges will be the solution to identify an integrated process methodology with a cost-effective approach for printing macro/micro/nano objects and devices.

Using Three-Dimensional Printing to Enhance Cross-Sectional Anatomy Instruction

2018 ◽  
Vol 108 (4) ◽  
pp. 304-310 ◽  
Author(s):  
Dominick J. Casciato ◽  
Natalie A. Builes ◽  
Bibi N. Singh
Keyword(s):  
Lower Extremity ◽  
Cross Sections ◽  
Clinical Skills ◽  
Three Dimensional ◽  
Cost Effective ◽  
Cross Sectional ◽  
Cadaveric Specimen ◽  
Three Dimensional Printing ◽  
Anatomical Dissection ◽  
Dimensional Printing

Background:The increased use of external interventions to diagnose and treat podiatric medical pathologies has warranted a greater understanding of the lower extremity in the transverse plane. Films, prosections, and plastinated cross sections have long been used alongside traditional instruction to assist students in anatomical studies. These methods, however, often fail to provide the tactile component of anatomical dissection and may obscure or exclude the requisite structures for identification by medical students. Such teaching techniques prove costly, time sensitive, and dated compared with the relatively less expensive and customizable nature of three-dimensional (3-D) printing.Methods:Limb length was measured on a cadaveric specimen, and eight cross sections of equal width were excised. Manual sketches of these sections were then digitized and 3-D printed.Results:Three-dimensional printing provides a safe and reproducible means to construct customizable cross sections of the lower extremity. Moreover, this method proves to be relatively inexpensive.Conclusions:Advancing traditional didactic teaching with the use of cost-effective 3-D printing can facilitate the visuospatial comprehension of lower-extremity anatomy. The evolution of 3-D printing enhances the clinical skills essential for the interpretation of imaging studies as well as planning for surgical procedures such as external fixation application.

scholarly journals The Application of three-dimensional modelling in acetabular surgery

2021 ◽  
Author(s):  
The Annals of Research
Keyword(s):  
3D Printing ◽  
Three Dimensional ◽  
Cost Effective ◽  
3D Modelling ◽  
Imaging Data ◽  
Three Dimensional Printing ◽  
3 Dimensional ◽  
Orthopedic Surgeons ◽  
Dimensional Printing

Background: The emerging Three-dimensional (3D) modelling improves intraoperative visualization, management, and analysis of available imaging data, the 3D form of available image, provides the surgeon with a better comprehension of the geometry, size, and exact relationship between target and normal tissue. The role of 3D modelling in orthopedic pelvic and hip surgical planning is brought to focus.Methods: The Medline database was searched using the keywords 3D printing, three dimensional printing, 3 dimensional printing and the results were screened for pelvis and hip surgery related full text articles. The duplicates and non-related articles were removed.Results: The articles were used to build a review with focus on Acetabulum, Pelvis, Hip and sacrum. We found that the role of 3D printing is non-negligible. The advances made with the help of 3D printing are wonderful and promising. The use of 3D saw its application in many fields. But the orthopedic surgery to our observance has benefitted the most till now.Conclusions: With the advances in the technology it is needed to make the 3D modelling easier, quicker, accurate, cost effective and reliable to help implement its deeper use in orthopedics. The authors believe that the 3D printing is an enormous help for the orthopedic surgeons which will only lead to positive outcomes.

Development of novel 3D-printed robotic prosthetic for transradial amputees

2015 ◽  
Vol 40 (3) ◽  
pp. 400-403 ◽  
Author(s):  
Kendall F Gretsch ◽  
Henry D Lather ◽  
Kranti V Peddada ◽  
Corey R Deeken ◽  
Lindley B Wall ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Cost Effective ◽  
Limb Amputation ◽  
Three Dimensional Printing ◽  
Myoelectric Prostheses ◽  
Thumb Movement ◽  
3D Printed ◽  
The Cost ◽  
Robotic Prosthesis ◽  
Dimensional Printing

Background and aim: Upper extremity myoelectric prostheses are expensive. The Robohand demonstrated that three-dimensional printing reduces the cost of a prosthetic extremity. The goal of this project was to develop a novel, inexpensive three-dimensional printed prosthesis to address limitations of the Robohand. Technique: The prosthesis was designed for patients with transradial limb amputation. It is shoulder-controlled and externally powered with an anthropomorphic terminal device. The user can open and close all five fingers, and move the thumb independently. The estimated cost is US$300. Discussion: After testing on a patient with a traumatic transradial amputation, several advantages were noted. The independent thumb movement facilitated object grasp, the device weighed less than most externally powered prostheses, and the size was easily scalable. Limitations of the new prosthetic include low grip strength and decreased durability compared to passive prosthetics. Clinical relevance Most children with a transradial congenital or traumatic amputation do not use a prosthetic. A three-dimensional printed shoulder-controlled robotic prosthesis provides a cost effective, easily sized and highly functional option which has been previously unavailable.

Three-dimensional printed embedded channel–based resistive strain sensor: Fabrication and experimental characterization

2019 ◽  
Vol 30 (10) ◽  
pp. 1518-1526 ◽  
Author(s):  
Austin Smith ◽  
SM Mahdi Mofidian ◽  
Hamzeh Bardaweel
Keyword(s):  
Fused Deposition Modeling ◽  
Flexible Substrate ◽  
Three Dimensional ◽  
Cost Effective ◽  
Cross Sectional ◽  
Three Dimensional Printing ◽  
Fused Deposition ◽  
Elastic Filament ◽  
Deposition Modeling ◽  
Dimensional Printing

This work explores the feasibility of commercially available elastic filament and desktop fused deposition modeling three-dimensional printing as a simple and cost-effective route to develop flexible sensors. The fabricated sensor consists of a three-dimensional printed flexible substrate with embedded U-shaped channels that are filled with Galinstan (Ga 68.5% In 21.5% Sn 10%) liquid metal conductor. When the sensor is strained, the cross-sectional area of the channels decreases causing a reduction in the conducting area and, therefore, a change in resistance. First, sensors measuring approximately 2100 μm by 200 μm are fabricated. Results demonstrate gauge factors of approximately 2.1 at 38.8% strain with high linearity and little hysteresis. In addition, smaller strain sensors, measuring approximately 696 µm by 203 µm, are fabricated with gauge factors of nearly 1.0 at 13.2% strain. Results show that substrate relaxation plays an essential role in determining the functionality of these sensors. The Mullins effect largely influences the recovery properties of the rubber-like sensor substrate. This leads to a noticeable relaxation in the substrate during cyclic loading. The results demonstrate the potential of commercially available fused deposition modeling three-dimensional printing technology and filaments to produce complex designs and sensor platforms.

Cost-Effective Three-Dimensional Printing of Visibly Transparent Microchips within Minutes

2014 ◽  
Vol 86 (6) ◽  
pp. 3124-3130 ◽  
Author(s):  
Aliaa I. Shallan ◽  
Petr Smejkal ◽  
Monika Corban ◽  
Rosanne M. Guijt ◽  
Michael C. Breadmore
Keyword(s):  
Three Dimensional ◽  
Cost Effective ◽  
Three Dimensional Printing ◽  
Dimensional Printing
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