Influence Of Technological Parameters Research Articles

Effect of electrospinning solution parameters on the properties of nonvolven fibrous material based on polyhydroxibutyrate

In the present work, the influence of technological parameters of poly-3-hydroxybutyrate solution on the process of electrospinning of ultrathin fibers has been studied. It was established that the electrical conductivity and viscosity of the polymer solution largely determine the geometry and morphology of ultrathin fibers. Modification of solutions with ionic electrolyte and hydrolytic agent reduces the initial molecular weight of the polymer and leads to an increase in the viscosity of the system. It’s shown that the inputting of CNT leads to theorientation of the polymer macrochains in the amorphous phase. As a result, there are increases in mechanical, sorption properties and resistance to oxidative, thermal-oxidative and hydrolytic degradation. The fibers obtained will find application in biomedicine.

Assessment of Influence of Technological Parameters on Peat Extraction

The article evaluates the weather and hydrological impact on geotechnology when fragmented peat is milled and dried at a peat deposit. The amount of moisture feeding the fragmented peat of a deposit was studied and was determined to depend on the ground water level. The influence of drainage on the water regime of a high-more peat deposit and that of weather conditions on ground water level fluctuations over time have been evaluated at production sites with an open drainage network. When a peat deposit is drained, under the action of gravitation (the pressure differential in the ground and a drain), ground water seeps into the drains and is transported along them, down-grade, to the collection network and diverted from the drained area. The processes of moisture movement at a peat deposit help evaluate and justify measures to improve its water-air regime which is used in the development of intensive draining methods for a peat deposit and the maintenance of the necessary water regime in peat deposits.

Experimental investigation and modeling of temperature influence on vertical and radial growth rate of tin dioxide nanowires synthesized by catalyst-free thermal evaporation method

Structures based on tin dioxide nanowires were grown on silicon substrates by catalyst-free physical vapor deposition. The effect of growth conditions on properties of SnO2 nanowire (NW) was studied. Analytical model of the formation functional tin dioxide nanowires by physical vapor deposition was developed. Known mathematical models of nanowires formation are based on the catalytic mechanism of growth and they have a significant disadvantage as there is a large number of experimental parameters which are difficult to determine. In addition, the model equations have only numerical solution and this makes the comparison of theoretical and experimental results difficult. Therefore the development of analytical model which describes influence of technological parameters on geometric characteristics of formed 1D structures is extremely important. Such a model could be useful for optimization of technological parameters of growth of nanowires with the given properties. The key feature of the proposed model is self-consistent relationship between the radial, vertical growth rate and shape of growing nanowires.

Influence of blend composition and annealing temperature on optical properties of organic photovoltaic cell based on P3HT:PCBM interpenetrating blend

ABSTRACTIn this paper, the influence of blend composition and annealing temperature on optical properties of organic photovoltaic (OPV) cells based on P3HT:PCBM interpenetrating blend is presented. Optical optimization of the OPV cell is first performed to determine the optimal geometry of the stack. The studied device structure is: glass/ITO/PEDOT:PSS/P3HT:PCBM/Ca/Al. Simulation results give as optimized thicknesses: dPEDOT:PSS = 27 nm and dActive layer = 91 nm. The optimized OVP cell gives a short-circuit current JSC = 12.48 mA/cm2. The influence of technological parameters on the performance of the optimized P3HT:PCBM blend OPV cell is then clearly defined. Simulation results show that among the mass ratio of P3HT:PCBM blend active layers studied (1:1, 1:2, 2:1, 2:3 and 3:2), the active layer with the higher blend mass ratio (2:1) gives the best optical properties. Also, increasing the annealing temperature of the active layer leads to increase absorption. The blend active layer annealed at 140°C presents the best optical properties of the OPV cell.

Influence of technological parameters on the degree of enzymatic hydrolysis of high-protein products

Influence of technological parameters on the degree of enzymatic hydrolysis of high-protein products

The influence of technological parameters on the efficiency of the hydrate formation reaction in the system methane — SDS aqueous solutions

The article deals with methane hydrate synthesis in the presence of sodium dodecyl sulfate. The search for optimal conditions for this synthesis in a cylindrical continuous stirred tank reactor was provided. The limit after which the increasing of pressure in the reactor does not make a significant contribution to an increase in the gas content of the product was experimentally detected. The analysis of the impact of cooling rate on intensity of the hydrate formation had been carried out. The mode of gas supply to the reactor, cooling rate and working pressure, ensuring the highest efficiency of the methane hydrate synthesis under the specified conditions, are found.

Дослідження впливу технологічних параметрів процесу вакуумного азотування алюмінієвих сплавів на властивості дифузійних іонноазотованих шарів

Дослідження впливу технологічних параметрів процесу вакуумного азотування алюмінієвих сплавів на властивості дифузійних іонноазотованих шарів

DETERMINATION OF FORMATION REGIMES FOR BILAYER COBALT DYSPROSIUM INTERMETALIC SURFACE ALLOY

High tech industrial fields on modern development stage are in need of construction materials with an optimal ratio of volume and surface properties, along with low cost of material itself. As evidenced by studies, in order to give a set complex of properties to a workpiece that operates under specific conditions, it is often sufficient to only modify its surface area. Over the course of studies, by means of gravimetric, influence of technological parameters (temperature and time samples are kept in the melt) on specific mass change of cobalt samples, that act as substrate, during electroless diffusive saturation with dysprosium in eutectic melt of lithium and potassium chlorides have been studied. A mathematical dependency was established for specific mass change of cobalt samples on time spent in melt for temperature range of 873–973 K. Composition of intermetallic coats obtained on surface of cobalt samples was studied means of EDX and SEM analyses. It was discovered, that for chosen temperature range, diffusion layers formed on surface of cobalt samples consists of two structural zones that correspond to Co-Dy and Cp2Dy phases.

The influences of technological parameters on the ultraviolet photocatalytic reaction rate and photocatalysis-assisted polishing effect for SiC

Abstract At first, aiming at ultraviolet (UV) photocatalysis-assisted polishing of single-crystal 6H-SiC (silicon carbide), the particle size and zeta potential of colloidal silica abrasives on photocatalytic reaction conditions were detected. By doing so, it was guaranteed that colloidal silica abrasives retained their stability with the assistance of photocatalysis. Afterward, the effects of various factors (including light intensity, H2O2 concentration, TiO2 concentration, and pH) on the reaction rate of UV photocatalysis were explored and an orthogonal experiment was conducted on the four factors. The test results showed that H2O2 concentration and light intensity delivered the most significant and the least influences on the rate of photocatalytic reaction, respectively. As the rate of photocatalytic reaction increased, the material removal rate (MRR) increased while the surface roughness Ra generally decreased. In terms of the influence on MRR, the four factors were, in descending order: H2O2 concentration, pH, light intensity, and TiO2 concentration; as for the influence on surface roughness Ra, the four factors were, in descending order: pH, H2O2 concentration, TiO2 concentration, and light intensity. The difference in rank of the four factors arose because MRR was mainly affected by the rate of photocatalytic reaction while surface quality (roughness) was synchronously influenced by the reaction rate and the stability of abrasives. At a light intensity at 1000 mW/cm2, H2O2 concentration of 4.5 vol%, TiO2 concentration of 3 g/L, and a pH of 11, the optimal polished surface can be attained, with a surface roughness Ra of 0.423 nm.

The influence of technological parameters on the bead geometry in the manufacture of parts by laser metal deposition

The dependences of geometric characteristics of single tracks obtained by laser deposition of austenitic steel powder on the shift of the laser beam focus and the distance from the nozzle to the substrate at different values of mass flow and scanning speed are investigated. It is shown that the characteristic value of the track height decreases from 900 to 700 microns with a decrease in the beam size by half at a powder flow rate of 8.4 g/min and a speed of 350 mm/min, decreases from 1100 to 900 microns at a flow rate of 15.6 g/min, and increases by 30-50% with an increase in flow rate by 2.3 times. The ratio of height to width (shape factor) decreases with the growth of the scanning speed from about 0.7 to 0.4 at a flow rate of 15.6 g/min and to 0.25 at a flow rate of 8.5 g/min. Process performance scaling parameters are defined. The results obtained make it possible to optimize the technological parameters of the laser metal deposition process.

Methods for obtaining grain bases for food

The use of the full potential of grain and leguminous crops laid down in them by nature is an important task in addressing the issues of balanced nutrition of the population, because food products based on these crops satisfy up to 70% of the daily human need for proteins, fats and carbohydrates, micro and macro elements, biologically active substances and remain the most affordable for all categories of consumers. Moreover, the preservation of all macro-, micronutrients, biologically active substances of the source grain remains a serious problem, because in the traditional approach to grain processing, the content of these components inevitably decreases. In the future, this process continues under the influence of technological parameters at all stages of production and storage of products. An analysis of the production technology of grain foundations showed a number of stages specific to each type of production. At the same time, micronization, extrusion and germination are recognized as the most productive. In preliminary studies, 4 types of grain and leguminous crops were identified as the most promising for the production of grain bases, which were subjected to micronization and extrusion according to the optimal conditions established by water absorption capacity and thermodynamic characteristics. Used the device DSC. Samples of selected cultures were germinated. In micronized, extruded and germinated grain bases, the chemical and vitamin composition is determined. A comparative characteristic revealed a promising method for the production of grain bases, which will be further used in food.

The Influence of Technological Parameters of Cold Gas Dynamic Spraying on Wear Resistance of Aluminum–Carbon Nanofibers Coatings

The Influence of Technological Parameters of Cold Gas Dynamic Spraying on Wear Resistance of Aluminum–Carbon Nanofibers Coatings

The influence of technological parameters of smelting on the durability of the lining of an arc steel-smelting furnace under the conditions of Ural Steel JSC

The results of the study of the influence of the main technological parameters of steel smelting (composition of charge materials, duration of smelting and furnace downtime, oxidation refining intensity and metal temperature at the outlet) on the lining resistance of a small arch of a steel-smelting arc furnace in the Ural Steel JSC are presented. Recommendations have been developed for optimizing the technological and energetic regimes of steel smelting, which make it possible to prolong the service life of the lining of a small vault and reduce the cost of steel production. Ill. 5. Ref. 20. Tab. 1.

Influence of technological parameters on sensorial quality of refrigerated poultry meat

Influence of technological parameters on sensorial quality of refrigerated poultry meat

The influence of technological parameters for the production of plasticized polyvinylbutyral films on their optical and physico-mechanical properties

The effect of pressure, temperature and time during direct pressing on the strength and optical characteristics of adhesive plasticized polyvinyl butyral films is studied. A mathematical analysis of the results of a full factorial experiment is carried out and the regression equations are derived.

Laser Welding in Different Spatial Positions of T-joints of Austenitic Steel

It has been selected the most industry perspective laser welding technological implementations of the welded T-joints made of fine-sheeted heat resisting steel AISI 321 by identifying the influence of technological parameters on formation quality, level of mechanical properties and structural peculiarities of the welded T-joints obtained by laser welding in different spatial positions.

ДОСЛІДЖЕННЯ ВПЛИВУ МІЦНОСТІ ЗАРЯДІВ ПІРОТЕХНІЧНИХ НІТРАТНО-МЕТАЛЕВИХ СУМІШЕЙ НА ПОЖЕЖНУ БЕЗПЕКУ ВИРОБІВ НА ЇХ ОСНОВІ

As a result of the conducted experimental researches it is established that the breaking of the strength of surface layers of pyrotechnic nitrate-metal mixtures leads to premature fire and explosive action of products on their basis in the conditions of external thermal influences. New data on the influence of technological parameters of mixture samples (the ratio and dispersion of components, the coefficient of their compaction, the nature of nitrate-containing oxidizer and organic additive, the pressure and compression direction, cure time, height and diameter of samples) on the limit of their strength are obtained. The tensile strength of the specimens is lower in the compression direction and their compressive strength is higher in this direction. The coefficient of compaction of the mixtures and their strength are independent characteristics: less dense pressed mixture may be more durable, and vice versa. As the content of the metal powder in the mixture increases, the strength of its samples increases monotonically, moving to the same limit value. With increasing the temperature of the mix-ture from 213 K to 333 K, regardless of the content of titanium, the nature of the oxidizer and the coef-ficient of compaction, the strength of its samples decreases; the degree of influence of the heating temperature decreases as the oxidant content decreases. The degree of the increase in the strength of samples of mixtures with a change in the dispersion of titanium powder practically does not depend on the nature of the oxidizer: for mixtures of Ti + NaNO3 and Ti + Ba (NO3)2 with increasing the disper-sion of titanium powder from 45 μm to 250 μm, the strength of their samples decreases in 1,4 … 1,6 times. Increasing the strength of the samples of these mixtures while reducing the dispersion of the oxidizer from 250 μm to 45 μm is also almost the same: for the mixture of Ti + NaNO3 – 1,3 times, and for the mixture of Ti + Ba (NO3)2 – 1,4 times.

Zn-Acetate-Containing ionic liquid as highly active catalyst for fast and mild methanolysis of Poly(lactic acid)

Zn-acetate-containing ionic liquid (IL), 1-butyl-3-methylimidazolium acetate-promoted zinc acetate (2[Bmim][OAc]-Zn(OAc)2) was synthesized and used to catalyze the methanolysis of poly(lactic acid) (PLA). In this study, it was found that not only the methanolysis condition was milder compared with reported literatures, but also the high conversion of PLA and the yield of product methyl lactate were obtained when this Zn-acetate-containing IL was used as catalyst. The influences of technological parameters on PLA methanolysis were investigated and the optimum reaction conditions were obtained. Under the following conditions of catalyst (n[Bmim][OAc]:nZn(OAc)2 = 2.0:1, 0.04 g), n(CH3OH):n(PLA) = 5.0:1 and PLA (4.0 g) at 110 °C for 2.0 h, the PLA conversion and the methyl lactate yield were over 97% and 92%, respectively. Compared with the conventional ILs and other traditional catalysts, this Zn-acetate-containing IL exhibited excellent catalytic performance and the advantage of small dosage. The IL could be reused for 5 times, both FT-IR and TGA results indicated that the spectra of the reused IL were almost similar to those of the fresh one. Moreover, a possible mechanism of PLA methanolysis catalyzed by [Bmim][OAc]-Zn(OAc)2 was proposed through the experiments. The reaction kinetics was also investigated, and the results showed that it was a pseudo-first order kinetic reaction with an activation energy of 20.96 kJ/mol.

The influence of technological parameters for the manufacture of precision seamless tubes for automotive industry

The influence of technological parameters for the manufacture of precision seamless tubes for automotive industry

A study on a deep-drawing process with two shaping states for a fuel-filter cup using combined simulation and experiment

In this article, a deep-drawing process using a double-action hydraulic press is examined for its ability to machine the shaping deformation of a fuel-filter cup made from SPCC steel. Many researchers have studied the geometric, physical, and technological parameters of the deep-drawing process. However, most of those studies ignored the optimization parameters of the two shaping deformation states to ensure uniformity of thickness and the disappearance of wrinkling and tearing during machining. In this study, geometric and technological parameters (e.g. blank-holder force, die-shoulder radius, and radial clearance between punch and die) are optimized in both states. The deep-drawing process for a fuel-filter cup is simulated using ABAQUS software, and optimal parameters are determined by applying the Taguchi orthogonal array computation and combining it with an analysis of variance method. The numerical results are then verified with corresponding experiments. The obtained numerical and experimental results show that the die-shoulder radius is one of the most influential parameters affecting the shaping of the cup during the deep-drawing process. Moreover, the influences of technological parameters on the formability of sheet metal are finally analyzed and selected for designing and improving deep-drawing molds.