Influence Of Production Technology Research Articles

The Influence of Production Technology on the Structure and Mechanical Properties of Niobium–Silicon–Aluminum Alloys

Cast Nb–14 at % Si–9 at % Al alloys fabricated by self-propagating high-temperature synthesis (SHS) and by SHS followed by electric arc remelting have been investigated. A structure consisting of a solid solution of silicon and aluminum in niobium (NbSS), a Nb3Al intermetallic compound, and a β-Nb5(Si,Al)3silicide formed in the alloy fabricated by SHS. Electric arc remelting suppressed the formation of the Nb3Alphase and resulted in the formation of a dispersed two-phase NbSS and β-Nb5(Si, Al)3 structure in the alloy.The increased volume fraction of NbSS and the dispersed structure formed after electric arc remelting in thealloy increase its fracture toughness to 14.8 ± 0.8 MPa m1/2 compared to 7.7 ± 0.8 MPa m1/2 for the SHSpreparedalloy.

The Influence of Production Technology on the Structure and Mechanical Properties of Niobium–Silicon–Aluminum Alloys

The Influence of Production Technology on the Structure and Mechanical Properties of Niobium–Silicon–Aluminum Alloys

Influence of Production Technology on Selected Polymer Properties

In the article, the study of polymer properties is dealt with as a result of production technology on pat-terns, which were made by injecting, machining of the extruded profile and 3D printing. All samples were made from iglidur® J260 material, and they were subsequently tested in order to find out properties of roughness, breaking strength, hardness according to Shore, friction coefficient and swelling. Further-more, the samples were exposed to light microscopy, where material structure was studied, especially from the view of structure defects, distribution and shape of solid lubricants. Based on the performed experiment, it can be stated that production technology affects some properties of the sliding bushing. Above all, properties of the sliding bushing were affected by 3D printing technol-ogy. The measured samples had the worst results with regard to roughness and swelling values. Con-versely, the values acquired by measuring hardness were surprising as the 3D priting samples reached better results than the samples made by machining. The samples created by injection had the best re-sults compared to others in all tests. The measured values corresponded to the values listed by the man-ufacturer. Machined sample of the extruded profile is mainly affected by the type of machining, but with consideration to the structure, it can be claimed that the extruded material has the same structure as an injected piece and its properties, with the exception of surface roughness, are on the same level.

Research on the Influence of Production Technologies on the Positioning Accuracy of a Robotic Arm for Low-Handling Weights

The subject of the paper is the research of production technologies’ influence on positioning accuracy of a robotic arm. The aim was to find out whether different production technologies (additive and conventional) and the related design differences of the robotic arm affect its operational functionality. In the research, positioning accuracy of a robotic arm formed by three partial arms was specifically investigated, while the first partial arm, Arm I, was manufactured by two different technologies. On the robotic arm, the research was carried out in such a way that the first partial arm, Arm I, was being continuously changed and was available for research purposes in two variants. Each of the Arm I variants was manufactured using a different technology (additive and conventional) while, at the same time, the individual variants also differed in construction. The design differences of both variants were related to the production technology used. The measurement of positioning accuracy was performed with the use of two methods. Specifically, a contact and a non-contact method were used. The contact method was implemented on a 3D-measuring machine, RAPID, and the second contactless method was performed using an inductive sensor.

Influence of production technology on the structure and properties of powder high-speed steels

Powder high-speed steels are a new group of tool materials with enhanced operational capabilities compared to steels made using traditional technology. The paper presents an assessment of the impact of powder steel production technology on their structure and properties. The studies are carried out on the example of two grades of experimental powder steels - R7M5F2-MP and M5F5-MP in three directions: the influence of compacting technology on the structure and properties of powder steels; development of optimum modes of hardening heat treatment; improving the quality control methodology of powder high-speed steels at the main stages of their production technology. A comparative analysis on the quality of the experimental powder high-speed steels depending on the chemical composition and various schemes for compacting workpieces from atomized powder is carried out. As a result of studies, the influence of hardening heat treatment modes on the phase composition, structure and basic properties of powder high-speed steels is established. Recommendations on hardening thermal working regimes to ensure the optimum ratio between hardness and heat resistance of steels are developed. Studies have shown feasibility of using powder high-speed steels (including domestic ones).

Influence of the production technology on kefir characteristics: Evaluation of microbiological aspects and profiling of phosphopeptides by LC-ESI-QTOF-MS/MS.

The influence of production technology, namely, temperature, pH and 2-step fermentation (back-slopping approach), on the microbiological characteristics and on the phosphopeptide profile of kefir obtained with kefir grains was investigated. The growth of yeasts, lactic acid bacteria (LAB) and acetic acetic bacteria (AAB) in both grains and kefir was affected by the incubation temperature and by the use of back-slopping. In particular, at 25°C the microbiota of kefir grains was mainly composed by LAB and yeasts, while at 18°C yeasts represented the dominant group in kefir. Back-slopping at 25°C determined a significant increase of AAB. A comprehensive characterization of potentially bioactive peptides, including caseino-phosphopeptides (CPPs), was performed, for the first time, in kefir obtained with kefir grains, using preliminary enrichment on hydroxyapatite followed by dephosphorylation and analysis by Liquid Chromatography-ElectroSpray Ionization-Quadrupole-Time of Flight-tandem mass spectrometry (LC-ESI-QTOF-MS/MS). As a result, seventy-three phosphopeptides, mostly arising from caseins (79% β-casein, 8% αs1-casein and 9% αs2-casein) and all including from three to five serine residues in their sequences, were identified. Seventy-one of them showed the typical motif "SerP-SerP-SerP-Glu-Glu", which is crucial for the ability of caseins to bind to minerals. Several peptides were observed, for the first time, from the 1-40 region of β-casein. As for the effect of production technology, phosphopeptide profiles of kefirs obtained at 25°C and 18°C were very similar, whereas kefir produced under acidic conditions showed a predominance of smaller peptides, suggesting a higher level of proteolysis. Conversely, kefir obtained through back-slopping at 25°C contained longer peptides, thus indicating a lower proteolytic activity and a poor reproducibility in the kefir phosphopeptide profile occurring when grains are reused.

Buckling Problems of Structurally-Anisotropic Composite Panels of Aircraft with Influence of Production Technology

The different approaches were analyzed to investigate the buckling problems of structurally-anisotropic panels made from composite materials. Aircraft composite structure design in the field of production technology is the outlook research trend. New mathematical model relations for the buckling investigation of structurally-anisotropic panels comprising composite materials are presented in this study. The primary scientific novelty of this research is the further development of the theory of thin-walled elastic ribs related to the contact problem for the skin and the rib with an improved rib model. One considers the residual thermal stresses and the preliminary tension of the reinforcing fibers with respect to panel production technology. The mathematical model relations for the pre-critical stressed state investigation of structurally-anisotropic panels made of composite materials are presented. Furthermore, the mathematical model relations for the buckling problem investigation of structurally-anisotropic panels made of composite materials are presented in view of the pre-critical stressed state. The critical force definition of the general bending form of the thin-walled system buckling and the critical force definition of the many-waved torsion buckling are of the most interest in accordance with traditional design practices. In both cases, bending is integral with the plane stress state. Thus, the buckling problem results in the boundary value problem when solving for the eighth order partial derivative equation in the rectangular field. The schematization of the panel as structurally-anisotropic has been proposed as a design model when and the critical forces of total bending form of buckling are determined. For a many-waved torsion buckling study, one should use the generalized functions set. The solution is designed by a double trigonometric series and by unitary trigonometric series. A computer program package is developed using the MATLAB operating environment. The computer program package has been utilized for multi-criteria optimization of the design of structurally-anisotropic aircraft composite panels. The influence of the structure parameters on the level of critical buckling forces for bending and for torsion modes has been analyzed. The results of testing series are presented.

On the Influence of Production Technologies and Savings Propensities on Economic Growth. Findings Considering a Solow's Type Growth Model

This review analyses the influence of technologies and saving propensities of workers and shareholders on economic growth, considering the \cite{bk2000} model. We show how investing behaviours and production peculiarities condition the evolution of capital over time. We highlight that fluctuations and multiple equilibria arise only when the elasticity of substitution between capital and labour is lower than one. Moreover, only production functions with variable elasticity of substitution between inputs are able to describe the poverty trap phenomenon. Complex dynamics emerge when the difference between the saving propensity of the two income groups is sufficiently high.

Statics and buckling problems of aircraft structurally-anisotropic composite panels with the influence of production technology

The mathematical model relations for stress-strain state and for buckling investigation of structurally-anisotropic panels made of composite materials are presented. The mathematical model of stiffening rib being torsioned under one-side contact with the skin is refined. One takes into account the influence of panel production technology: residual thermal stresses and reinforcing fibers preliminary tension. The resolved eight order equation and natural boundary conditions are obtained with variation Lagrange procedure. Exact analytical solutions for edge problems are considered. Computer program package is developed using operating MATLAB environment. The influence of the structure parameters on the level of stresses, displacements, of critical buckling forces for bending and for torsion modes has analyzed.

Влияние технологии производства на структурообразование и свойства бетона виброцентрифугированных колонн

Влияние технологии производства на структурообразование и свойства бетона виброцентрифугированных колонн

Influence of production technology on magnetic properties of nanocrystalline stacked and block magnetic cores

Influence of production technology on magnetic properties of nanocrystalline stacked and block magnetic cores

Understanding the rapid growth of China's energy consumption: A comprehensive decomposition framework

This paper uses a comprehensive decomposition framework, which combines production-theoretical decomposition analysis and index decomposition analysis, to explain the rapid growth of China's energy consumption from 2003 to 2010. The proposed approach provides information about the influence of production technology as well as the effects of inputs substitution. The main findings are as follows. First, Economic expansion was the major driver of China's energy consumption growth which increased energy consumption by 236%. Second, industrial structure change, labor-energy substitution, and technical efficiency change also play significant roles in the increasing energy consumption. Third, technological progress and capital-energy substitution reduced China's energy consumption by 22.4% and 15.3%, respectively.

The Influence of the Production Process on Mechanical Properties of Rubber Testing Samples

The article deals with the influence of production technology on mechanical properties of rubber testing samples. In practice, rubber testing samples are cut out from a compression molded sheet, also in case of testing of rubber compounds appointed for injection molding. However, the different way of the preparation of testing samples and the production itself may have a negative effect on the mechanical properties of the final product. Thus the article judges, to what extent the mechanical properties (tensile strength, extension, tear strength and microhardness) of testing samples from selected rubber materials are influenced by injection molding, and evaluates the possible divergence.

Influence of production technology on characteristics of methyl esters of higher fatty acids

The results of experimental investigations of the composition and qualitative characteristics of methyl esters of higher fatty acids produced in Belarus by various technologies are reported. The differences in their characteristics and the causes thereof are ascertained.

Influence of production technology on surface properties of Cd 0.85Mn 0.15Te intrinsic and gallium doped

Two types of Cd 0.85Mn 0.15Te single crystal samples, intrinsic and gallium doped, were investigated using the surface photovoltage spectroscopy and photoconductivity methods. It has been stated that technology of production influences to some extent the properties of the surface layers. The intrinsic samples differ in the existence or not of the acceptor levels and shallow surface states. In the case of the gallium doped samples the shapes of the surface spectroscopy curves are different, but the energetic schemes are the same.

The Influence of Production Technology on Risk and the Cost of Capital

This paper uses a time-state-preference valuation model to examine how the firm's choice of technology and production method affects its equilibrium level of risk and, as a result, the firm's cost of capital. A fixed and flexible method of production is analyzed for a firm using a Cobb-Douglas production function. In both cases, it is found that risk and the cost of capital decrease with the level of capital intensity. Implications are drawn for the specification of empirical tests of the determinants of risk.