scholarly journals Casting Octahedra for Reproducible Multi-Anvil Experiments by 3D-Printed Molds

Minerals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 4
Author(s):  
Yingxin Liu ◽  
Haijian Li ◽  
Xiaojing Lai ◽  
Feng Zhu ◽  
Robert P. Rapp ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Thermal Insulation ◽  
Low Cost ◽  
Cell Assembly ◽  
High Pressure Cell ◽  
New Approach ◽  
Materials Properties ◽  
Cast Product ◽  
3D Printed

Making consistent and precise octahedral pressure media is crucial for reproducible high-pressure experiments in the multi-anvil press. Here we report a new approach of casting octahedra using 3D-printed molds, and pressure calibrations for octahedra both with and without pre-existing gaskets (“fins”). The 3D-printed molds for casting octahedra from either Ceramacast 584-OF or 646 cement improve the reproducibility of the octahedra and allow for a pre-existing central hole (for the high-pressure cell assembly) in the final cast product. Pressure and temperature calibrations of the octahedra have been performed based on phase transitions in bismuth (Bi) and silica (SiO2), respectively, in order to determine the efficiency and reproducibility of pressure generation and thermal insulation for cast octahedra designed for use with 18/12, 14/8, and 10/5 multi-anvil assemblies. The pressure-generating efficiency of the 14/8 and 10/5 octahedra with pre-existing gaskets, cast from the 584-OF cement, is similar to that of the corresponding COMPRES (Consortium for Materials Properties Research in Earth Sciences) octahedra, and more efficient than pre-cast octahedra made from the same material but lacking pre-existing gaskets. The efficiency of pre-gasketed 18/12 octahedra made of the 646 cement is markedly lower than those of the 584 cement. However, the 18/12 large-volume octahedra, cast (with fins) from the ZrO2-based 646 cement, also provides efficient thermal insulation. Casting octahedral solid pressure media for multi-anvil experiments using 3D-printed “injection” molds is a low-cost and low failure-rate alternative for conducting reproducible experiments at high pressure in the multi-anvil apparatus.

A Variable-Temperature Hydrostatic Pressure Cell for Raman Scattering Experiments

1986 ◽  
Vol 40 (2) ◽  
pp. 217-223 ◽  
Author(s):  
J. J. Martin ◽  
R. Cavagnat ◽  
J. C. Cornut ◽  
M. Couzi ◽  
G. Daleau ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Raman Scattering ◽  
Variable Temperature ◽  
Structural Phase ◽  
The Other ◽  
Structural Phase Transitions ◽  
High Pressure Cell ◽  
Pressure Cell ◽  
The One

A variable-temperature hydrostatic high-pressure cell for Raman scattering experiments is presented; it can be commonly used for pressures up to about 6 kbars, in the temperature range between 340 and 80 K. Examples of applications are given, concerning conformational equilibriums in liquid tridecane on the one hand, and structural phase transitions in crystalline (CH3)4NMnCl3(TMMC) and (CH3)4NCdCl3 (TMCC), on the other hand.

scholarly journals High Pressure Cell for Small-Angle Neutron and Light Scattering Studies of Phase Transitions in Complex Liquids

1997 ◽  
Vol 29 (11) ◽  
pp. 931-939 ◽  
Author(s):  
Hiroyuki Takeno ◽  
Michihiro Nagao ◽  
Yoshiaki Nakayama ◽  
Hirokazu Hasegawa ◽  
Takeji Hashimoto ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Light Scattering ◽  
Small Angle ◽  
High Pressure Cell ◽  
Pressure Cell ◽  
Complex Liquids

Electronic properties and phase transitions in Si, ZnSe, and GaAs under pressure cycling up to 20-30 GPa in a high-pressure cell

2009 ◽  
Vol 246 (3) ◽  
pp. 604-611 ◽  
Author(s):  
Sergey V. Ovsyannikov ◽  
Vladimir V. Shchennikov ◽  
Andrzej Misiuk ◽  
Ivan A. Komarovsky
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Electronic Properties ◽  
High Pressure Cell ◽  
Pressure Cycling ◽  
Pressure Cell

scholarly journals Open-source, partially 3D-printed, high-pressure (50-bar) liquid-nitrogen-cooled parahydrogen generator

2021 ◽  
Vol 2 (1) ◽  
pp. 49-62
Author(s):  
Frowin Ellermann ◽  
Andrey Pravdivtsev ◽  
Jan-Bernd Hövener
Keyword(s):  
Magnetic Resonance Imaging ◽  
High Pressure ◽  
Open Source ◽  
Liquid Nitrogen ◽  
Nuclear Polarization ◽  
Low Cost ◽  
3D Models ◽  
Resonance Imaging ◽  
3D Printed ◽  
Magnetic Resonance Imaging Mri

Abstract. The signal of magnetic resonance imaging (MRI) can be enhanced by several orders of magnitude using hyperpolarization. In comparison to a broadly used dynamic nuclear polarization (DNP) technique that is already used in clinical trials, the parahydrogen (pH2)-based hyperpolarization approaches are less cost-intensive, are scalable, and offer high throughput. However, a pH2 generator is necessary. Available commercial pH2 generators are relatively expensive (EUR 10 000–150 000). To facilitate the spread of pH2-based hyperpolarization studies, here we provide the blueprints and 3D models as open-source for a low-cost (EUR <3000) 50-bar liquid-nitrogen-cooled pH2 generator.

Janus – A New Approach to Air Combat Pilot Training

2019 ◽  
Vol 2019 (4) ◽  
pp. 7-22
Author(s):  
Georges Bridel ◽  
Zdobyslaw Goraj ◽  
Lukasz Kiszkowiak ◽  
Jean-Georges Brévot ◽  
Jean-Pierre Devaux ◽  
...  
Keyword(s):  
Low Cost ◽  
Cost Effective ◽  
High Energy ◽  
Training System ◽  
Embedded Sensors ◽  
Pilot Training ◽  
New Approach ◽  
Combat Aircraft ◽  
Air Combat ◽  
The Cost

Abstract Advanced jet training still relies on old concepts and solutions that are no longer efficient when considering the current and forthcoming changes in air combat. The cost of those old solutions to develop and maintain combat pilot skills are important, adding even more constraints to the training limitations. The requirement of having a trainer aircraft able to perform also light combat aircraft operational mission is adding unnecessary complexity and cost without any real operational advantages to air combat mission training. Thanks to emerging technologies, the JANUS project will study the feasibility of a brand-new concept of agile manoeuvrable training aircraft and an integrated training system, able to provide a live, virtual and constructive environment. The JANUS concept is based on a lightweight, low-cost, high energy aircraft associated to a ground based Integrated Training System providing simulated and emulated signals, simulated and real opponents, combined with real-time feedback on pilot’s physiological characteristics: traditionally embedded sensors are replaced with emulated signals, simulated opponents are proposed to the pilot, enabling out of sight engagement. JANUS is also providing new cost effective and more realistic solutions for “Red air aircraft” missions, organised in so-called “Aggressor Squadrons”.

Pioneering Low-Cost 3D-Printed Transtibial Prosthetics to Serve a Rural Population in Sierra Leone

2020 ◽  
Author(s):  
Merel van der Stelt ◽  
Martin P. Grobusch ◽  
Abdul R. Koroma ◽  
Marco Papenburg ◽  
Ismaila Kebbie ◽  
...  
Keyword(s):  
Sierra Leone ◽  
Rural Population ◽  
Low Cost ◽  
3D Printed

scholarly journals High-Pressure Spectroscopy Study of Zn(IO3)2 Using Far-Infrared Synchrotron Radiation

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Akun Liang ◽  
Robin Turnbull ◽  
Enrico Bandiello ◽  
Ibraheem Yousef ◽  
Catalin Popescu ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Synchrotron Radiation ◽  
Infrared Radiation ◽  
Room Temperature ◽  
Far Infrared ◽  
Low Pressure ◽  
Pressure Response ◽  
Spectroscopy Study ◽  
Far Infrared Radiation

We report the first high-pressure spectroscopy study on Zn(IO3)2 using synchrotron far-infrared radiation. Spectroscopy was conducted up to pressures of 17 GPa at room temperature. Twenty-five phonons were identified below 600 cm−1 for the initial monoclinic low-pressure polymorph of Zn(IO3)2. The pressure response of the modes with wavenumbers above 150 cm−1 has been characterized, with modes exhibiting non-linear responses and frequency discontinuities that have been proposed to be related to the existence of phase transitions. Analysis of the high-pressure spectra acquired on compression indicates that Zn(IO3)2 undergoes subtle phase transitions around 3 and 8 GPa, followed by a more drastic transition around 13 GPa.

scholarly journals UV Inscription and Pressure Induced Long-Period Gratings through 3D Printed Amplitude Masks

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 1977
Author(s):  
Ricardo Oliveira ◽  
Liliana M. Sousa ◽  
Ana M. Rocha ◽  
Rogério Nogueira ◽  
Lúcia Bilro
Keyword(s):  
State Of The Art ◽  
Low Cost ◽  
Resonance Wavelength ◽  
Complex Structures ◽  
Pressing Method ◽  
Long Period ◽  
Long Period Gratings ◽  
3D Printed ◽  
Mechanical Pressing ◽  
First Time

In this work, we demonstrate for the first time the capability to inscribe long-period gratings (LPGs) with UV radiation using simple and low cost amplitude masks fabricated with a consumer grade 3D printer. The spectrum obtained for a grating with 690 µm period and 38 mm length presented good quality, showing sharp resonances (i.e., 3 dB bandwidth < 3 nm), low out-of-band loss (~0.2 dB), and dip losses up to 18 dB. Furthermore, the capability to select the resonance wavelength has been demonstrated using different amplitude mask periods. The customization of the masks makes it possible to fabricate gratings with complex structures. Additionally, the simplicity in 3D printing an amplitude mask solves the problem of the lack of amplitude masks on the market and avoids the use of high resolution motorized stages, as is the case of the point-by-point technique. Finally, the 3D printed masks were also used to induce LPGs using the mechanical pressing method. Due to the better resolution of these masks compared to ones described on the state of the art, we were able to induce gratings with higher quality, such as low out-of-band loss (0.6 dB), reduced spectral ripples, and narrow bandwidths (~3 nm).

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