scholarly journals Possible Chromatographie Effect of Liquid-Crystalline Permeation

1973 ◽  
Vol 28 (12) ◽  
pp. 1967-1968 ◽  
Author(s):  
W. Helfrich
Keyword(s):  
Material Flow ◽  
Liquid Crystalline ◽  
Permeation Rate ◽  
Flow Through

Permeation, i. e. material flow through cholesteric and smectic layers, may vary in speed for the components of a mixture. We derive qualitative formulas for the permeation rate of solute molecules in cholesterics as a function of their size. The possibility of a new kind of chromatography based on permeation in cholesterics or smectics is discussed.

Parallel Extrusion of Aluminum Alloy Heat Sink with Round-Fin

2013 ◽  
Vol 739 ◽  
pp. 131-135
Author(s):  
Li Han Zhang ◽  
Ke Sheng Wang ◽  
Yu Han ◽  
Jia Yu Ying
Keyword(s):  
Heat Sink ◽  
Material Flow ◽  
Extrusion Process ◽  
Element Analysis ◽  
Automotive Lighting ◽  
Metal Sheets ◽  
The Finite Element Analysis ◽  
Alloy Heat ◽  
Flow Through ◽  
Good Agreement

Parallel extrusion is a combined extrusion process for forming round-fin heat sink on thick metal sheets. In this paper, the parallel extrusion has been applied to manufacture the round-fin heat sink in the automotive lighting. Numerical simulations on the round-fin heat sink forming using the software DEFORM were carried out. The tooling structure with counterpressure on the heat sink formation was investigated. The results show that the tooling structure with counterpressure is helpful to the formation of round-fin heat sink, which not only ensures the height of each round-fin on the heat sink is uniform but also retards the initiation of flow-through on the reverse side of round-fin. In addition, the experiments of press forging process were conducted to validate the finite element analysis, it is shown that the friction at the punch-blank interface has more significant effect on preventing the initiation of flow-through compared with the friction at the die-blank interface, which implies that the punch-blank interface has more significant effect on the material flow in the formation of round-fin, and the simulation results are in good agreement with the experimental data.

Applying Lean Manufacturing Principles to Revolutionize Cubrside Equipment and Collection Processes

2007 ◽  
Author(s):  
Edward W. Smith ◽  
P. Judson Johnston ◽  
Joshua D. Summers
Keyword(s):  
Material Flow ◽  
Lean Manufacturing ◽  
Value Added ◽  
Manufacturing Companies ◽  
Production Flow ◽  
Environmentally Conscious ◽  
Collection Process ◽  
Flow Through ◽  
Similar Vein ◽  
Environmentally Conscious Design

The application of lean manufacturing principles has improved the production flow of manufacturing companies across the globe. In a similar vein, environmentally conscious design has been an increasingly important avenue of research which similarly seeks to reduce waste and thereby mitigate environmental impact. An analysis of the curbside municipal solid waste (MSW) and recycling collection process from a lean manufacturing standpoint reveals numerous non-value added activities which can be eliminated or reduced and value-added activities which can be made more efficient. Environmental America Inc. (EAI) has proposed a collection process which will improve the overall material flow through the use of a collection vehicle specializing in the combined collection of raw waste and recyclable waste. This collection vehicle, combined with localized, low-impact material offloading facilities has the potential to revolutionize the curbside collection process. Our research supports this vision by configuring the truck layout and process operations, as discussed in this paper.

scholarly journals Investigating the Mechanics of Hybrid Metal Extrusion and Bonding Additive Manufacturing by FEA

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 811 ◽  
Author(s):  
Jørgen Blindheim ◽  
Torgeir Welo ◽  
Martin Steinert
Keyword(s):  
Additive Manufacturing ◽  
Material Flow ◽  
Deposition Process ◽  
Feed Speed ◽  
Element Analysis ◽  
Reduced Pressure ◽  
Metal Structures ◽  
Material Deposition ◽  
Flow Through ◽  
Metal Extrusion

Hybrid Metal Extrusion & Bonding Additive Manufacturing (HYB-AM) is a hybrid manufacturing technology for the deposition of layered metal structures. This new deposition process is a complex metal forming operation, yet there is significant lack of knowledge regarding the governing mechanisms. In this work, we have used finite element analysis (FEA) to study material flow in the extruder, as well as the conditions at the interfaces of the deposited extrudate and the substrate, aiming to identify and characterize the process parameters involved. Analysis of the material flow shows that the extrusion pressure is virtually independent of the deposition rate. Furthermore, from the simulations of the material deposition sequence, it is clearly visible how the contact pressure at the interface will drop below the bonding threshold if the feed speed is too high relative to the material flow through the die. The reduced pressure also leads to the formation of a ‘gas-pocket’ inside the die, thus further degrading the conditions for bonding. The analyses of the process have provided valuable insights for the further development and industrialization of the process.

Press Forging Forming of the Round-Fin on Heat Sink

2013 ◽  
Vol 706-708 ◽  
pp. 448-451
Author(s):  
Chong Chao Lin ◽  
Ke Sheng Wang ◽  
Yu Han ◽  
Li Han Zhang
Keyword(s):  
Friction Coefficient ◽  
Friction Factor ◽  
Heat Sink ◽  
Material Flow ◽  
Extrusion Process ◽  
Metal Sheets ◽  
Flow Through ◽  
Good For

Press forging forming is a combined extrusion process for forming round-fin on heat sink on thick metal sheets. A series of simulations on the round-fin forming using the program DEFORM were carried out. The blank thickness and friction coefficient on the formation of round-fin were studied. The results show that the blank thickness is very good for the round-fin formation, and the thicker the blank is, the better the round-fin can be formed; and also when both the punch-blank interface and the die-blank interface have the same value of friction factor, the larger value of friction factor is in favor of round-fin forming, the further investigation reveals that the friction at the punch-blank interface has more significant effect on preventing the initiation of flow-through compared with the friction at the die-blank interface, which implies that the punch-blank interface has more significant effect on the material flow in the formation of round-fin.

scholarly journals Eulerian Description of Rail Straightening Process

2014 ◽  
Vol 624 ◽  
pp. 213-217 ◽  
Author(s):  
Tomas Návrat ◽  
Jindrich Petruška
Keyword(s):  
Numerical Analysis ◽  
Material Flow ◽  
Beam Element ◽  
Fe Analysis ◽  
Lagrangian Description ◽  
Element Formulation ◽  
Deformation Effect ◽  
Plastic Bending ◽  
Eulerian Description ◽  
Flow Through

The paper deals with numerical analysis of the process of roller straightening of rails. The problem of repeated elasto-plastic bending is solved by a program in MATLAB based on FEM algorithm with Eulerian description of material flow through the straightening machine. Beam element formulation with a shear deformation effect is used for the rail discretization. The results are compared with literature and standard FE analysis with Lagrangian description of material flow. Effectiveness of presented formulation is discussed and its applicability for fast iterative optimization of the straightening process is illustrated.

scholarly journals Investigation of the dispersion processes of composite colloidal capillary-porous materials

2019 ◽  
pp. 21-25
Author(s):  
Zh.O. Petrova ◽  
V.M. Vyshnievskyi ◽  
Yu.P. Novikova ◽  
A.I. Petrov
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Porous Materials ◽  
Material Flow ◽  
Maximum Yield ◽  
Flow Through ◽  
The Impact ◽  
First Time ◽  
Brittle State

The technology of drying colloidal capillary-porous materials to a final humidity of 6-8%, developed at the Institute of Technical Thermophysics of the NAS of Ukraine, allowed to obtain a brittle state, in which it is possible to grind this product to small particles. The most suitable for industrial grinding of the dried composite colloidal capillary-porous materials is the impact method, because when wiping and crushing the material has accumulated, stuck to the working surface. Powders are characterized by one pronounced maximum corresponding to the particle size of the powder of 0,16 mm. As the rotation speed of the shredder rotor changes, the particle size distribution of 0,16 mm increases by reducing the larger particles. The amount of powder thus obtained is directly proportional to the speed of rotation of the rotor. The study of the dispersion and classification of functional powders showed that all powders have the largest particle size of 0,16 mm. The maximum yield of this fraction is 70% and the lowest is 40%. The structural-mechanical characteristics of powders from composite colloidal capillary-porous materials were investigated for the first time.  Characteristics of different fractions were determined by such parameters as bulk density, vibration density, angle of natural slope, speed of material flow through the funnel and others. Studies to determine the structural and mechanical properties of functional powders have shown that they can be attributed to more bulk powders, as opposed to highly bound monopowders.  Creating compositions improves their structural and mechanical properties.

Corruption in interaction: the role of social capital in private–public relationships

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Julia V. Bondeli ◽  
Malena I. Havenvid ◽  
Hans Solli-Sæther
Keyword(s):  
Social Capital ◽  
Material Flow ◽  
Business Networks ◽  
Administrative Authority ◽  
Content Type ◽  
Public Network ◽  
Industrial Marketing ◽  
The Social ◽  
Flow Through

Purpose This paper aims to explore corrupt exchange as a type of socioeconomic interaction in private–public relationships and its effects on material flow in connected private-private relationships. Design/methodology/approach The paper is based on a case study of a private–public network of an import firm in Russia. It focusses on corrupt exchange in routine interactions between the firm’s managers and officials in three regulatory authorities. Findings The study reveals how different types of corrupt exchange between firm managers, officials and intermediaries serve as a problem-solving tool that facilitates material flow through bureaucratic gates. Research limitations/implications The paper contributes to the industrial marketing and purchasing research by showing how the social capital concept is useful for explicating mechanisms of socioeconomic interaction in business networks and how the interaction context conditions actors’ roles and interdependencies. Practical implications The paper raises practitioners’ awareness of corrupt exchange in business networks and enables them to anticipate and manage upcoming challenges in bureaucratic procedures. Social implications The study shows how networks’ non-transparent and manipulative tendencies may provide favourable conditions for corruption in the business landscape. Originality/value The study provides a unique empirical insight into the socioeconomic mechanisms of corrupt exchange in business networks. It contributes theoretically by conceptualising corrupt officials as taking on the role of quasi-business actors in the personal possession of administrative authority as a resource and by using a novel conceptualisation of social capital to study private–public interaction in business networks.

scholarly journals Plastic deformation treated as material flow through adjustable crystal lattice

2014 ◽  
Vol 63 ◽  
pp. 012130 ◽  
Author(s):  
P Minakowski ◽  
J Hron ◽  
J Kratochvíl ◽  
M Kružík ◽  
J Málek
Keyword(s):  
Plastic Deformation ◽  
Crystal Lattice ◽  
Material Flow ◽  
Flow Through
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