scholarly journals Porous granules formation from oil crops by extrusion process: a theoretical perspective

OCL ◽  
2021 ◽  
Vol 28 ◽  
pp. 47
Author(s):  
Zaur A. Meretukov ◽  
Evgeny P. Koshevoy ◽  
Ivan A. Shorstkii ◽  
Charles Odilichukwu R. Okpala
Keyword(s):  
Carbon Dioxide ◽  
Theoretical Perspective ◽  
Extrusion Process ◽  
Hard Phase ◽  
Oil Crop ◽  
Oil Crops ◽  
Extrusion Processing ◽  
Initial Stage ◽  
Definition Of ◽  
Extrusion Technology

The introduction of extruders, in particular how it works and its principles, must be started from the definition of the extrusion process, the description of its development and types, as well as its functions and advantages. In order to understand the process of extrusion technology, it is necessary to go into detailed descriptions and discussions together with theoretical insights of the subject. In the present article, we discuss a theoretical perspective of production of porous granules from oil crops by extrusion technology. Let’s divide this theoretical perspective into three steps. At first, we study the modeling of statics of oil crop mix compressibility together with carbon dioxide. At second, we study the heat exchange and phase transformation during the stroke of oil crop extruder filled with CO2. At third, we observe the deformation of the oil crops during the extrusion process. There is a probability that extrusion process of oil crop mix with the hard phase of carbon dioxide provides technological way that does not overheat the cellular structure. Potentially, the equation of Van der Waals is able to describe the change in volume of oil crops, which may be related with range of factors associated with volume expansion, calculated by equations as the expansion of granule material takes place at the outlet of extruder matrix. The extrusion processing of a mix of oil crops and carbon dioxide in hard phase at initial stage may likely occur as temperature declines. The resulting values show good compliance of theoretical results to experimental data on the example of coriander seeds.

The methodology of experimental research of the feed components extrusion process in order to improve its energy performance

2020 ◽  
pp. 147-152
Author(s):  
E. M. Ratnikov ◽  
D. O. Milko
Keyword(s):  
Experimental Studies ◽  
Energy Performance ◽  
Extrusion Process ◽  
Mathematical Methods ◽  
Screw Extruder ◽  
Mathematical Planning ◽  
Factors Affecting ◽  
Extrusion Processing ◽  
Definition Of

Annotation Purpose. Development of a program and methods for conducting experimental studies of the extrusion process with the definition of parameters and modes of operation of the extruder to improve its energy performance. Methods. Methods of mathematical statistics, synthesis, analysis, description and modeling were used. Results. The application of mathematical methods, in particular mathematical planning, reduces the number of experiments several times, and allows to evaluate the role of influencing factors, obtain a mathematical model of the process and determine the optimal conditions for its parameters and modes, etc. Conclusions. The methodology for experimental studies of a screw extruder is presented with the necessary equipment and methodology for processing the obtained experimental data. A mathematical method of planning, which reduces the number of experiments several times, allows us to evaluate the role of factors affecting productivity and energy intensity is presented. Keywords: extruder, auger, nutrients, research methodology, extrusion, processing, feed.

Definition of a JA-2 Equivalent Propellant to be Produced by Continuous Solventless Extrusion

2013 ◽  
Vol 80 (3) ◽  
Author(s):  
Thelma G. Manning ◽  
Joseph Leone ◽  
Martijn Zebregs ◽  
Dinesh R. Ramlal ◽  
Chris A. van Driel
Keyword(s):  
Extrusion Process ◽  
Continuous Manufacturing ◽  
Twin Screw Extrusion ◽  
Extrusion Processing ◽  
Roll Mill ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Ballistic Properties ◽  
Definition Of ◽  
Double Base

In order to eliminate residual solvents in ammunition and to reduce the emissions of volatile organic compounds to the atmosphere, the U.S. Army ARDEC has teamed with TNO in developing a new process for the production of solventless propellant for tank ammunition. To reduce the costs of solventless propellants production, shear roll mill and continuous extrusion processing was investigated. As described in this paper JA-2 a double base propellant cannot be processed without solvent by the extrusion process. An alternative JA-2 equivalent propellant was defined. The aim of this work is to demonstrate the manufacturing of this propellant by solventless continuous twin screw extrusion processing while maintaining gun performance characteristics of conventional JA-2 propellant. This is elucidated by explicitly researching the relationship between interior ballistic properties of the gun propellant and utilizing a continuous manufacturing process. Processing conditions were established, and the propellant was manufactured accordingly. The extruded propellant has the desired properties, which resulted in a comparable gun performance as the conventional JA-2 propellant.

Enhancement of aluminum billets extrusion technology

2020 ◽  
pp. 353-358
Author(s):  
A.I. Dmitryuk ◽  
A.A. Grigor’ev
Keyword(s):  
Extrusion Process ◽  
Aluminium Powder ◽  
Material Characteristics ◽  
Initial Stage ◽  
Automation Systems ◽  
Negative Effect ◽  
Extrusion Technology

Аlgorithm for the calculating of the power parameters (force, power, speed) of the extrusion process of semifi nished products from aluminium powder is proposed. The initial parameters for the calculations are material characteristics, geometric and speed parameters of the extrusion process. The developed algorithm allows to calculate and reduce the negative effect of process instability, especially at the initial stage of extrusion, and to reduce properties inhomogeneous of the producing bars through the use of automation systems.

scholarly journals Application of supercritical carbon dioxide extrusion in food processing technology

2017 ◽  
Vol 71 (2) ◽  
pp. 127-134 ◽  
Author(s):  
Jelena Panak-Balentic ◽  
Djurdjica Ackar ◽  
Antun Jozinovic ◽  
Jurislav Babic ◽  
Borislav Milicevic ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Food Processing ◽  
Supercritical Co2 ◽  
Food Production ◽  
Extrusion Process ◽  
Processing Technology ◽  
Carbon Dioxide Co2 ◽  
Extrusion Technology ◽  
Supercritical Carbon

Extrusion process is one of the most important innovations of the 20th century applied in many industries. Extrusion is a technology that is increasingly used for the production of various food products, especially snacks and breakfast cereals. Supercritical carbon dioxide (CO2) as a non-toxic, non-flammable and inexpensive, is applied in many processes, including the extrusion technology. Supercritical CO2 extrusion process (SCFX) found its application primarily in the processing and manufacturing plastic, but recently more and more begins to be applied in food production and processing. Scientific researches in this area are based in production of extrudates with improved properties compared to conventional extrusion process without the addition of CO2. A number of applications of SCFX in food processing technology will be reviewed and numerous advantages over the conventional process will be described in this paper.

THE CHARACTERISTICS OF ARTIFICIAL RICE WITH SEAWEED Eucheuma cottonii ADDITION AS A DIETARY FIBER SOURCE

2014 ◽  
Vol 6 (1) ◽  
Author(s):  
Natalia Prodiana Setiawati ◽  
Joko Santoso ◽  
Sri Purwaningsih
Keyword(s):  
Blood Glucose ◽  
Dietary Fiber ◽  
Dietary Fibre ◽  
Extrusion Process ◽  
The Body ◽  
Starch Digestibility ◽  
Food Commodities ◽  
The Stability ◽  
Extrusion Technology ◽  
Eucheuma Cottonii

The utilization of local food commodities such as corn and cassava with seaweed addition as a dietary fiber source for producing artificial rice through extrusion technology is an  alternative for food diversification. The research was carried out to find out the best composition (rice, corn, cassava, and seaweed) and temperature of extrusion process on making artificial rice and the influence of dietary fibre on sensory properties and physicochemical. The composition of rice, corn, and cassava in proportion  of 1:3:1 with 20% seaweed, Eucheuma cottonii, addition and temperature extruder of 90 °C were selected as the best product for artificial rice. The  sensory evaluation was 8.02±0.21 (people’s preference). In physicochemical properties, dietary fiber significantly affected on low bulk density and starch digestibility. This condition is very good for health especially in maintaining the stability of blood glucose in the body. Keywords: artificial rice, composition, extrusion, seaweed, dietary fibre, temperature

On Linkhood, Topicalization and Clitic Left Dislocation

2002 ◽  
Vol 38 (2) ◽  
pp. 193-245 ◽  
Author(s):  
THEODORA ALEXOPOULOU ◽  
DIMITRA KOLLIAKOU
Keyword(s):  
Theoretical Perspective ◽  
Point Of View ◽  
Clitic Doubling ◽  
Left Dislocation ◽  
Information Packaging ◽  
Card System ◽  
Clitic Left Dislocation ◽  
Empirical Point ◽  
Definition Of ◽  
Structural Definition

This paper focuses on the Information Packaging notion of linkhood and provides a structural definition of this notion for Greek. We show that a combination of structural resources – syntactic (left dislocation), morphological (clitic duplication) and phonological (absence of nuclear accent) – are simultaneously exploited to realize linkhood in Greek, a generalization that can be captured in a constraint-based grammar such as HPSG, which permits the expression of interface constraints. We assume Vallduví's (1992) approach to Information Packaging, and Engdahl & Vallduví's (1996) implementation of the latter in HPSG, but deviate from Vallduví's work in adopting Hendriks & Dekker's (1996) revised definition of linkhood that relies on non-monotone anaphora. From an empirical point of view, our approach directly accounts for the invariable association of Clitic Left Dislocated NPs with wide scope readings, as well as a number of systematic differences in felicity conditions between Clitic Left Dislocation and other apparently related phenomena (Topicalization and Clitic Doubling). From a theoretical perspective, our analysis departs from syntax-based notions of topichood or discourse-linking and supports a definition that unifies linkhood with other anaphora phenomena. As such, it arguably overcomes previously noted problems for Vallduví's treatment of links as the current-locus-of-update in a Heim-style file-card system.

Microcellular Polymeric Foams (MPFs) Generated Continuously in Supercritical Carbon Dioxide

2000 ◽  
Vol 629 ◽  
Author(s):  
Srinivas Siripurapu ◽  
Yvon J. Gay ◽  
Joseph R. Royer ◽  
Joseph M. DeSimone ◽  
Saad A. Khan ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Vinylidene Fluoride ◽  
Amorphous Polymer ◽  
Extrusion Process ◽  
Operating Conditions ◽  
Polymeric Foams ◽  
Poly Vinylidene Fluoride ◽  
Cell Densities ◽  
Supercritical Carbon

ABSTRACTMicrocellular polymeric foams (MPFs) hold tremendous promise for engineering applications as substitutes to their solid analogs in light of reduced manufacturing/materials costs and improved properties. We present a two-part study addressing the generation of such materials in the presence of supercritical carbon dioxide (scCO2). The first part describes the production of polystyrene MPFs in a continuous extrusion process, as well as the effect of operating conditions such as temperature and CO2 concentration on foam morphology. The second part discusses microcellular foaming of poly (vinylidene fluoride) (PVDF), a semicrystalline polymer, via blending with the amorphous polymer poly (methyl methacrylate) PMMA. Foams of pure PVDF possess ill-defined morphologies, whereas those of PVDF-PMMA blends show an improvement with cell sizes on the order of 10 mm or less and cell densities in excess of 109 cells/cm3.

scholarly journals On the Mechanism of Methane Conversion in the Nonсatalytic Processes of Its Thermal Pyrolysis and Steam and Carbon Dioxide Reforming

2021 ◽  
Author(s):  
E. Busillo ◽  
V. I. Savchenko ◽  
V. S. Arutyunov
Keyword(s):  
Carbon Dioxide ◽  
Methane Conversion ◽  
Carbon Dioxide Reforming ◽  
Temperature Range ◽  
Thermal Pyrolysis ◽  
First Order Kinetics ◽  
Initial Stage ◽  
Conversion Of Methane ◽  
Exponential Factors ◽  
Kinetics Of

Abstract A detailed kinetic modeling of the noncatalytic processes of thermal pyrolysis and steam and carbon dioxide reforming of methane revealed almost completely identical kinetics of the methane conversion in these processes. This suggests that, in the temperature range 1400–1800 K, the initial stage of conversion of methane in all these processes is its thermal pyrolysis. The modeling results agree well with the experimental data on methane pyrolysis. For the temperature range examined, the Arrhenius expressions (pre-exponential factors and activation energy) were obtained in the first-order kinetics approximation for the rate of methane conversion in the processes studied. The expressions derived may be useful for making preliminary estimates and carrying out engineering calculations.

scholarly journals Theoretical aspects of public administration electronic services

2017 ◽  
Vol 1 (2) ◽  
pp. 119-128
Author(s):  
Jozef Andraško
Keyword(s):  
Public Administration ◽  
Theoretical Perspective ◽  
Legal Order ◽  
Different Types ◽  
Definition Of

The author deals with the issue of public administration electronic services from the theoretical perspective. In particular, author is analysing all elements of the term in question. Furthermore, the author focuses on different types of categorization of public administration electronic services. Moreover, author is dealing with the definition of the term in question from the perspective of Slovak legal order.

scholarly journals SMART POWER AS THE FACTOR IN THE SINO-U.S. RELATIONS

2020 ◽  
Vol 5 (2(71)) ◽  
pp. 4-7
Author(s):  
Cheng Guo ◽  
Yin Qun
Keyword(s):  
International Relations ◽  
Public Diplomacy ◽  
Theoretical Perspective ◽  
Research Work ◽  
The United States ◽  
World Politics ◽  
Smart Power ◽  
Power Construction ◽  
Key Factor ◽  
Definition Of

This research work analyzes the characteristics of American public diplomacy from the perspectives of smart power theory, comparing China and the United States’ smart power strategy. The article revealed that globalization and the process of technological evolution have led profound changes in the contempopary world politics and international relations, the smart power factors such as culture, science, technology, and information have become increasingly prominent in political science. These factors have not only created the fundamental theory of smart power, but also affected the form and definition of diplomacy. The research methodology is based on a complex combination of scientific methods, mainly comparative, analytical, systematic. The obtained conclusions can be referred that smart power as a key factor, has become a new theoretical perspective for understanding changes in contempopary international relations and foreign policy. It has naturally become the theoretical support for public diplomacy, meanwhile public diplomacy itself is also an important content and strategic path for smart power construction.

Sign in / Sign up

Export Citation Format

Share Document