Review for layer-packing

2016 ◽  
Author(s):  
Anonymous
Keyword(s):  
Layer Packing

Staggered pillaring: a strategy to control layer–layer packing and enhance porosity in MOFs

2016 ◽  
Vol 69 (11-13) ◽  
pp. 1802-1811 ◽  
Author(s):  
Oliver M. Linder-Patton ◽  
Christian J. Doonan ◽  
Christopher J. Sumby
Keyword(s):  
Control Layer ◽  
Layer Packing

scholarly journals Thin-film materials based on phthalocyanine derivatives: structure and physico-chemical properties

2019 ◽  
Vol 30 ◽  
pp. 08006
Author(s):  
Alexandr Kazak ◽  
Margarita Marchenkova ◽  
Antonina Smirnova ◽  
Tatiana Dubinina ◽  
Alexey Seregin ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Thin Film ◽  
Water Surface ◽  
Chemical Properties ◽  
Lattice Parameter ◽  
Complexing Agent ◽  
Supramolecular Organization ◽  
Structure Parameters ◽  
Physico Chemical ◽  
Layer Packing

In order to establish the effect of the molecular structure of mix-substituted phthalocyanine derivatives on its supramolecular organization in thin-films, the floating layers of three A3B-type phthalocyanine derivatives were obtained. Their supramolecular organization was determined and it was found that the studied compounds form homogeneous stable floating layers on the water surface. Structure parameters of floating layers depend both on the length of aliphatic substituents (R = CnH2n+1) and the metal complexing agent. Ligands I and II form stable monolayer structures, which the layer packing periods increase with the elongation of aliphatic substituents: the lattice parameter (d) is 1.93 and 2.3 nm for ligands I (n = 6) and II (n = 8), correspondingly. During further compression of the formed monolayers, ligands I and II form stable bilayers, in which the arrangement of molecules remains similar to the structure of the previous monolayers. These bilayers contain minor inclusions of 3D aggregates. Metal complex III forms only stable monolayer (d = 2.06 nm), upon further compression of which 3D- aggregates included in the monolayer are formed.

Internal Heteroatom Substitution and the Layer Packing of Polymethylene Chains

2000 ◽  
Vol 104 (3) ◽  
pp. 532-537 ◽  
Author(s):  
Douglas L. Dorset ◽  
Dolores Clavell-Grunbaum ◽  
Robert G. Snyder
Keyword(s):  
Heteroatom Substitution ◽  
Layer Packing

scholarly journals A DEM study of powder spreading in additive layer manufacturing

2019 ◽  
Vol 22 (1) ◽  
Author(s):  
Yahia M. Fouda ◽  
Andrew E. Bayly
Keyword(s):  
Shear Layer ◽  
Powder Coating ◽  
Packing Fraction ◽  
Powder Layer ◽  
Process Conditions ◽  
Additive Layer Manufacturing ◽  
Layer Manufacturing ◽  
The Mean ◽  
Manufacturing Applications ◽  
Layer Packing

AbstractIn this paper, discrete element method simulations were used to study the spreading of an idealised, blade based, powder coating system representative of the spreading of spherical, mono-sized, non-cohesive titanium alloy (Ti6AlV4) particles in additive layer manufacturing applications. A vertical spreader blade was used to accelerate a powder heap across a horizontal surface, with a thin gap between the blade and the surface, resulting in the deposition of a thin powder layer. The results showed that it is inevitable to deposit a powder layer with a lower packing fraction than the initial powder heap due to three mechanisms: shear-induced dilation during the initiation of powder motion by the spreader; dilation and rearrangement due to powder motion through the gap; and the inertia of the particles in the deposited powder layer. It was shown that the process conditions control the contribution of these three mechanisms, and that the velocity profile in the shear layer in front of the gap is critical to the final deposited layer packing fraction. The higher the mean normalised velocity in the shear layer the lower the deposited layer packing fraction. The gap thickness and the spreader blade velocity affect the properties of the deposited layer; with the former increasing its packing fraction and the latter decreasing it. The analysis presented in this study could be adapted to powders of different materials, morphologies and surface properties.

scholarly journals The compression–error trade-off for large gridded data sets

2017 ◽  
Vol 10 (1) ◽  
pp. 413-423 ◽  
Author(s):  
Jeremy D. Silver ◽  
Charles S. Zender
Keyword(s):  
Lossless Compression ◽  
Original Data ◽  
Scientific Data ◽  
Linear Scaling ◽  
Data Sets ◽  
Single Pair ◽  
Trade Off ◽  
Significant Figures ◽  
Compression Layer ◽  
Layer Packing

Abstract. The netCDF-4 format is widely used for large gridded scientific data sets and includes several compression methods: lossy linear scaling and the non-lossy deflate and shuffle algorithms. Many multidimensional geoscientific data sets exhibit considerable variation over one or several spatial dimensions (e.g., vertically) with less variation in the remaining dimensions (e.g., horizontally). On such data sets, linear scaling with a single pair of scale and offset parameters often entails considerable loss of precision. We introduce an alternative compression method called "layer-packing" that simultaneously exploits lossy linear scaling and lossless compression. Layer-packing stores arrays (instead of a scalar pair) of scale and offset parameters. An implementation of this method is compared with lossless compression, storing data at fixed relative precision (bit-grooming) and scalar linear packing in terms of compression ratio, accuracy and speed. When viewed as a trade-off between compression and error, layer-packing yields similar results to bit-grooming (storing between 3 and 4 significant figures). Bit-grooming and layer-packing offer significantly better control of precision than scalar linear packing. Relative performance, in terms of compression and errors, of bit-groomed and layer-packed data were strongly predicted by the entropy of the exponent array, and lossless compression was well predicted by entropy of the original data array. Layer-packed data files must be "unpacked" to be readily usable. The compression and precision characteristics make layer-packing a competitive archive format for many scientific data sets.

Control of active semiconducting layer packing in organic thin film transistors through synthetic tailoring of dielectric materials

RSC Advances ◽  
2014 ◽  
Vol 4 (56) ◽  
pp. 29383-29392 ◽  
Author(s):  
Ranjodh Singh ◽  
Jagan Singh Meena ◽  
Yu-Cheng Chang ◽  
Chung-Shu Wu ◽  
Fu-Hsiang Ko
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Dielectric Materials ◽  
Organic Thin Film Transistors ◽  
Organic Thin Film ◽  
State Structure ◽  
Cage Structure ◽  
Structure Packing ◽  
New Family ◽  
Layer Packing

The influence of dielectric material's property on the solid state structure packing of active semiconducting layer in OTFTs has been carefully studied by employing a whole new family of dielectric materials based on the rigid, tetrahedral bulky moleculei.e.adamantane, a smallest cage structure of diamond.

scholarly journals On the three-phase mass transfer with solid particles adhered to the gas-liquid interface

2003 ◽  
Vol 1 (2) ◽  
pp. 160-177
Author(s):  
Endre Nagy
Keyword(s):  
Mass Transfer ◽  
Particle Size ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Mass Transfer Rate ◽  
Liquid Interface ◽  
Solid Particles ◽  
Transfer Model ◽  
Transfer Rates ◽  
Layer Packing

AbstractA heterogeneous, multi-layer mass transfer model is proposed for prediction of the effect of multi-layer packing of catalyst particles adhered to the gas-liquid interface. The behavior of the mass transfer rate with respect to the multi-layer packing, to the particle size and mass transfer coefficient without particles is discussed. It is shown that enhancement can be considerably increased by multi-layer packing compared to that of mono-layer packing, depending on the values of particle size and mass transfer coefficient. The predicted mass transfer rates using the proposed model was verified with experimental data taken from the literature. The model presented should be superior to that of published in the literature.

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