scholarly journals Three-Dimensional (3D) Laser-Induced Graphene: Structure, Properties, and Application to Chemical Sensing

2021 ◽  
Author(s):  
Federico Maria Vivaldi ◽  
Alexander Dallinger ◽  
Andrea Bonini ◽  
Noemi Poma ◽  
Lorenzo Sembranti ◽  
...  
Keyword(s):  
Chemical Sensing ◽  
Three Dimensional ◽  
Structure Properties

scholarly journals Worldwide Protein Data Bank validation information: usage and trends

2018 ◽  
Vol 74 (3) ◽  
pp. 237-244 ◽  
Author(s):  
Oliver S. Smart ◽  
Vladimír Horský ◽  
Swanand Gore ◽  
Radka Svobodová Vařeková ◽  
Veronika Bendová ◽  
...  
Keyword(s):  
Protein Data Bank ◽  
Three Dimensional ◽  
Data Bank ◽  
Resonance Spectroscopy ◽  
X Ray ◽  
Validation Metrics ◽  
Task Forces ◽  
X Ray Crystallography ◽  
Structure Properties

Realising the importance of assessing the quality of the biomolecular structures deposited in the Protein Data Bank (PDB), the Worldwide Protein Data Bank (wwPDB) partners established Validation Task Forces to obtain advice on the methods and standards to be used to validate structures determined by X-ray crystallography, nuclear magnetic resonance spectroscopy and three-dimensional electron cryo-microscopy. The resulting wwPDB validation pipeline is an integral part of the wwPDB OneDep deposition, biocuration and validation system. The wwPDB Validation Service webserver (https://validate.wwpdb.org) can be used to perform checks prior to deposition. Here, it is shown how validation metrics can be combined to produce an overall score that allows the ranking of macromolecular structures and domains in search results. The ValTrendsDBdatabase provides users with a convenient way to access and analyse validation information and other properties of X-ray crystal structures in the PDB, including investigating trends in and correlations between different structure properties and validation metrics.

scholarly journals Low-Cost and Lightweight 3D-Printed Split-Ring Resonator for Chemical Sensing Applications

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3049 ◽  
Author(s):  
Ahmed Salim ◽  
Saptarshi Ghosh ◽  
Sungjoon Lim
Keyword(s):  
Chemical Sensing ◽  
Ring Resonator ◽  
Low Cost ◽  
Three Dimensional ◽  
External Cavity ◽  
Cavity Resonator ◽  
Split Ring Resonator ◽  
Microwave Cavity ◽  
Split Ring ◽  
Sensing Applications

In this paper, a microwave cavity resonator is presented for chemical sensing applications. The proposed resonator is comprised of a three dimensional (3D) split-ring resonator (SRR) residing in an external cavity and capacitively coupled by a pair of coaxial probes. 3D-printing technology with polylactic acid (PLA) filament is used to build the 3D SRR and cavity. Then, the surfaces of the SRR and the inside walls of cavity are silver-coated. The novelty of our proposed structure is its light weight and inexpensive design, owing to the utilization of low density and low-cost PLA. A Teflon tube is passed through the split-gap of the SRR so that it is parallel to the applied electric field. With an empty tube, the resonance frequency of the structure is measured at 2.56 GHz with an insertion loss of 13.6 dB and quality factor (Q) of 75. A frequency shift of 205 MHz with respect to the empty channel was measured when deionized water (DIW) was injected into the tube. Using volume occupied by the structure, the weight of the proposed microwave resonator is estimated as 22.8 g which is significantly lighter than any metallic structure of comparable size.

A method to perform modulated structure studies using the programZMC

2017 ◽  
Vol 50 (6) ◽  
pp. 1834-1843
Author(s):  
E. J. Chan ◽  
D. J. Goossens
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Atomistic Simulation ◽  
Complex Structure ◽  
Three Dimensional ◽  
Molecular Crystals ◽  
Modulated Structure ◽  
Simulation Techniques ◽  
General Method ◽  
Structure Properties

The Monte Carlo simulation toolkitZMCprovides a general method for Monte Carlo simulation of disordered molecular displacements, orientations and site occupations. It is part of a suite of programs that allows convenient calculation of three-dimensional reciprocal space diffraction intensities. Such intensities are useful for extensive structure interpretations from diffraction experiments. Some physical properties can also be calculated from the simulation. This article reports the implementation of an integratedZMCmodule that facilitates the construction of modulated molecular crystals and allows the corresponding calculation of modulation satellites. Use of the module is explained and examples illustrated. The method is ideally suited for novice treatment of modulated structure features and also as a basic platform to explore complex structure/properties relationships using atomistic simulation techniques.

Enantiopure, Supramolecular Helices Containing Three-Dimensional Tetranuclear Lanthanide(III) Arrays: Synthesis, Structure, Properties, and Solvent-Driven Trinuclear/Tetranuclear Interconversion

2008 ◽  
Vol 47 (18) ◽  
pp. 8000-8015 ◽  
Author(s):  
Marco Lama ◽  
Olimpia Mamula ◽  
Gregg S. Kottas ◽  
Luisa De Cola ◽  
Helen Stoeckli-Evans ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Structure Properties

Three-dimensional macro-structures of two-dimensional nanomaterials

2016 ◽  
Vol 45 (20) ◽  
pp. 5541-5588 ◽  
Author(s):  
Khurram Shehzad ◽  
Yang Xu ◽  
Chao Gao ◽  
Xiangfeng Duan
Keyword(s):  
Recent Progress ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Structure Properties

This review summarizes the recent progress and efforts in the synthesis, structure, properties, and applications of three-dimensional macro-structures of two-dimensional nanomaterials.

Stop band shift based chemical sensing with three-dimensional opal and inverse opal structures

2007 ◽  
Vol 124 (2) ◽  
pp. 452-458 ◽  
Author(s):  
Cheng-Yu Kuo ◽  
Shih-Yuan Lu ◽  
Shengfu Chen ◽  
Matt Bernards ◽  
Shaoyi Jiang
Keyword(s):  
Chemical Sensing ◽  
Stop Band ◽  
Three Dimensional ◽  
Inverse Opal ◽  
Band Shift

scholarly journals THREE DIMENSIONAL CHARACTERIZATION OF SOIL MACROPOROSITY BY X-RAY MICROTOMOGRAPHY

2015 ◽  
Vol 39 (2) ◽  
pp. 448-457 ◽  
Author(s):  
Sabrina Passoni ◽  
Luiz Fernando Pires ◽  
Richard Heck ◽  
Jadir Aparecido Rosa
Keyword(s):  
Generation X ◽  
Soil Structure ◽  
Three Dimensional ◽  
Pore System ◽  
X Ray ◽  
Different Depths ◽  
Type Detector ◽  
Do So ◽  
Structure Properties

Analysis of the soil pore system represents an important way of characterizing soil structure. Properties such as the shape and number of pores can be determined through soil pore evaluations. This study presents a three-dimensional (3D) characterization of the shape and number of pores of a sub-tropical soil. To do so, a second generation X-ray microtomograph equipped with a plain type detector was employed. A voltage of 120 kV and current of 80 mA was applied to the X-ray tube. The soil samples analyzed were collected at three different depths (0-10, 10-20, and 20-30 cm). The results obtained allowed qualitative (images) and quantitative (3D) analyses of the soil structure, revealing the potential of the microtomographic technique, as well as the study of differences in soil macroporosity at different depths. Macroporosity was 5.14 % in the 0-10 cm layer, 5.10 % in the 10-20 cm layer, and 6.64 % in the 20-30 cm layer. The macroporosity of unclassified pores (UN) was 0.30 % (0-10 and 10-20 cm) and 0.40 % (20-30 cm), while equant pores (EQ) had values of 0.01 % at the three depths under analysis.

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

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