Rational Conditions Research Articles

Ecofriendly Dyeing Strategy Based on Dyeing Kinetics and Thermodynamic Analysis for Melt-Spun Polyurethane Fibers.

Melt-spun polyurethane fibers (MSPUFs) have garnered popularity owing to efficient production methods and exceptional stability. However, the development of the MSPUF has been restricted by challenges such as poor dyeability as well as energy and cost concerns associated with the dyeing process. Herein, we devised a highly efficient dyeing technique that operates at a lower temperature and a shorter duration. In comparison to conventional dyeing methods, our novel approach reduces the temperature from 98 to 75 °C, while reducing the amount of dye utilized by 25% and the dyeing time by 50%. In this method, the modifier increases both the positive charge and the amorphous zone of the fiber, while rational dyeing conditions are designed based on thermodynamic and kinetic analyses. This strategy enabled a 76.3% increase in E% and a 45.9% increase in K/S values at reduced temperatures and a shorter time while simultaneously improving the dye-fiber bonding fastness. This research methodology not only enhances the dyeing performance of MSPUF but also reduces energy consumption and dyeing costs, presenting an ecofriendly and economically novel approach for the development of dyeable MSPUF.

Determination of rational parameters of chemical transesterification technology of sunflower oil

The object of the study is the process of chemical transesterification of sunflower oil. Liquid vegetable oils are an important component in the products of chemical, cosmetic, paint, food and other industries. Among other oils, sunflower oil is of exceptional industrial importance. Chemical transesterification technology is used to obtain oils, fats and their mixtures with specified properties required for various industries. An important task is to develop rational conditions for the oil transesterification process using a highly efficient and safe catalyst. The process of chemical transesterification of refined deodorized frozen sunflower oil according to DSTU 4492 (CAS Number 8001-21-6) using potassium glyceroxide was studied. The original oil has the following parameters: peroxide value 0.2 ½ O mmol/kg, acid value 0.1 mg KOH/g, moisture mass fraction 0.03 %, crystallization temperature –18.38 °С. The effect of transesterification parameters on the oil crystallization temperature was examined. The catalyst concentration in all experiments was 0.45 % by weight of the oil. The oil crystallization temperature was determined by differential scanning calorimetry. Rational parameters of oil transesterification were defined: temperature 110 °C, duration 1.5 hours. Under these conditions, there is a maximum increase in the oil crystallization temperature (up to –4.1 °С). The effectiveness of the rational oil transesterification parameters was confirmed by changes in the triglyceride composition by chromatography analysis. The obtained rational conditions for the chemical transesterification of sunflower oil in the presence of the potassium glyceroxide catalyst can also be used in the processes of oil transesterification with other raw materials using this catalyst.

Effects of Ultrasound on Reactive Crystallization and Particle Properties of an Aromatic Amine in Batch and Continuous modes

Ultrasound has shown its benefits in the manufacturing processes of many pharmaceuticals and fine chemicals. This study focused on the reactive crystallization system of an aromatic amine and explored the potential uses of ultrasound in both batch and continuous modes. In batch experiments, we studied the effects of different sonication conditions including power, duration, and starting point on final particle properties. Under ultrasound, the crystal form and crystal morphology remained well maintained. The results of particle size and size distribution suggested that ultrasound reduced the mean sizes by improving the nucleation process and breaking up large particles. Additionally, the presence of ultrasound in continuous experiments was capable of inducing nucleation and the crystal products collected had a suitable distribution. Integrating ultrasound into the beginning of the continuous crystallization process can be an alternative to the seeding technique. The increasing sonication power did not reduce the induction time substantially. This indicated that a rational sonication condition should balance the overall process efficiency and energy consumption. The findings from batch and continuous experiments indicate that ultrasound could intensify industrial crystallization of the aromatic amine. Incorporating energy-efficient ultrasound with the continuous process will potentially lead to increased production efficiency and a well-controlled product quality.

Микронизация в технологии минорного компонента консервирующего действия

Natural preservatives are a global trend in the food industry. As a rule, they are traditional herbs or spices. Flavonoids inhibit microbial activity. However, they are effective only when their distribution in the food matrix is uniform. This uniformity is achieved by increasing their solubility, e.g., by micronization. The research assessed the feasibility and effectiveness of micronization of a plant preservative using a purified flavonoi d fraction obtained from defatted sea-buckthorn meal. The study featured samples of purified flavonoid fraction of sea-buckthorn meal with different dispersions. Their solubility, antioxidant properties, antimicrobial activity, and fungicidal effect were assessed by standard methods. Micronization under ultrasonic conditions and cryogenic grinding increased the solubility in water, ethyl, and oil. Ultrasonic micronization proved efficient as it produced particles of 1,400 nm under rational conditions, i.e., 50 W ultrasonic vibration in a 0.5% suspension for 10 min. The sample obtained in this way increased the rate of catalase reaction by 19% relative to the control sample while maintaining a constant rate of glutathione reduction. Its antioxidant activity increased fourfold. The samples demonstrated bacteriostatic activity against Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus, as well as fungistatic activity against Candida albicans. Purified flavonoid fraction of sea-buckthorn meal micronized under ultrasonic conditions can be recommended as a natural preservative in various food systems.

Determining the efficient mass ratio of the extractant and the object of extraction and the equilibrium concentrations of the target components in them

The caviar and lecithin complex of freshwater fish can be widely used for the production of various food products, including those of functional orientation. The main technological operations in lecithin technology should include the processes of extraction of the initial caviar raw material and raffinate obtained after the first stage of selective extraction. The purpose of the study is to identify the rational mass ratio of extractant and raw material (module), on which the extraction efficiency depends, as well as the final concentration of extracted substances in the extract to determine its current value in the process of mass transfer to study the kinetics of extraction. The object of the study is the caviar-anchovy complex of fathead carp, carp, pikeperch and catfish, as well as the extract and raffinate from it. Summarizing the experimental data on revealing the rational module, as well as the final concentration of extracted substances in the extracts obtained, we can conclude that for caviar of the fish species under study, the rational hydromodule for its extraction with acetone is the ratio of dry caviar : extractant 1 : 4, and for its extraction with ethyl alcohol is the ratio of dry caviar : extractant 1 : 8. If the mass ratio refers to the fresh caviar of the studied fish species, then its rational indicator at its extraction with acetone is the ratio of fresh caviar : extractant 1 : 1.5, and at its extraction with ethyl alcohol is the ratio of fresh caviar : extractant 1 : 3. The average final concentration of extracted substances from dry caviar of the studied fish species in the extracts obtained, if acetone was used as a solvent under rational conditions of mass transfer, corresponds to the value of 1.3 %, and if ethyl alcohol was used as a solvent under rational conditions of mass transfer, corresponds to the value of 1.0 %.

Optimization of the pumpkin pectin paste production process

Taking into account the mentioned advantages, the use of vegetable and fruit pastes with increased pectin content has great potential in therapeutic and preventive nutrition. They not only contribute to the removal of radionuclides, heavy metals and toxins from the body but also provide additional enrichment of the body with a complex of natural vitamins, tannins and sugars. These natural substances help to improve the work of the gastrointestinal tract, increase the general tone of the body and help strengthen the immune system. Optimized technological production processes, in particular the hydromodule of hydrolysis of raw materials, correctly selected temperature regimes and evaporation methods that ensure maximum efficiency of pectin extraction from raw materials. This makes it possible to achieve high quality of the finished product with full preservation of the beneficial properties of pectin substances. Modern technological methods guarantee the preservation of the maximum number of active components, which makes the product even more valuable for consumers. For the production of pectin pastes, Gleisdorfer Olkurbis, Hamlet, Pivdenny, Miranda and Dana Styrian Bare-seeded pumpkins were selected. The hydrolysis process was carried out using lactic acid and whey, which contributed to a faster process and acted as preservatives. According to the results of experimental studies, rational hydrolysis conditions were established: hydro modulus (1:14–1:17), concentration of hydrolyzers, temperature regime, hydrolysis time, and evaporation method. The evaluation of the product included the analysis of dry matter content, colour, pectin content and gel-forming properties. According to the results of the experiments, it was determined that the rational conditions for the hydrolysis of pumpkin raw materials are a temperature within 80°C, a duration of the process of 65 minutes and a hydromodule of 15–16. Rational conditions for evaporation in a vacuum are established, which allow obtaining high-quality pectin paste with a pectin content of 1.5% and a dry matter content within 70%. A specialized technology for the production of pectin pastes from pumpkin and other vegetable raw materials has been developed, which allows you to effectively preserve the natural properties and nutrients characteristic of local fruits and vegetables. Technological and hardware-technological production schemes have been developed, which will contribute to the organization of production in the areas where raw materials are grown, reducing transportation costs and contributing to regions' sustainable development. Localization of production contributes to the creation of new jobs and support of the local economy Thus, the use of vegetable and fruit pastes with increased pectin content has a great potential for strengthening the health of the population. They are a rich source of natural vitamins and microelements, which contribute to the improvement of the general condition of the body, increase immunity and protect against harmful effects of the environment. The growing demand for natural and healthy food products makes pectin pastes a promising direction for investment and development of new technologies in the food industry.

Development of a method for inactivating lipoxygenases in linseed using chemical reagents

The object of the study is the oxidative stability of the lipid component of linseed treated with a citric acid and sodium chloride solution. The rational composition of chemical reagents for inactivating linseed lipoxygenases was determined in the work. The obtained results make it possible to develop an effective linseed treatment method for increasing stability to oxidative spoilage. The proposed composition of the linseed treatment solution (citric acid – 1.0...1.3 %; sodium chloride – 0.6...0.8 %) significantly reduces the peroxide and anisidine numbers of the lipid component. This helps reduce oxidative spoilage during accelerated oxidation and storage under normal conditions. Rational treatment conditions were determined based on the approximate dependency of these indicators on the concentrations of chemical reagents. The data obtained in the work are explained by chemical interactions between the solution components and the enzyme complex of linseed, leading to enzyme denaturation and, accordingly, increased oxidative stability of the lipid component. A feature of the obtained results is the competitiveness of treated linseed, characterized by increased nutritional value due to improved technological properties. The results of the study allow minimizing the loss of nutritional value and increasing the shelf life of linseed products. The results are important for developing new oilseed processing technologies. This makes it possible not only to increase the stability of products against oxidative spoilage, but also to preserve their high nutritional value. Further research in this area will contribute to improving oilseed processing technologies, in particular linseed, which is an important contribution to the development of the food industry

Cost allocation for set covering: The happy nucleolus

We consider cost allocation for set covering problems. We allocate as much cost to the elements (players) as possible without violating the group rationality condition, and so that the excess vector is lexicographically maximized. This happy nucleolus has several nice properties. In particular, we show that it can be computed considering a small subset of “simple” coalitions only. While computing the nucleolus for set covering is NP-hard, our results imply that the happy nucleolus can be computed in polynomial time.

Small amendment arguments: how they work and what they do and do not show

AbstractThe small improvement argument has been said to establish that the standard weak preference or value relation can be incomplete. We first show that the argument is one of three possible ‘small amendment arguments’, each of which would yield the same conclusion. Generalizing the analysis thus, we subsequently present a strong and a weak version of small amendment arguments and derive the exact rationality conditions under which they reveal incompleteness. The results show that the arguments (in any of their variants) need not reveal a problem for the possibility of rational choice. In fact, it can be argued that they only reveal such a problem if the underlying relation is complete rather than incomplete.

“You must succeed!”: The role of leader irrational language on follower irrationality.

Extant literature has shown the impact of leadership styles on followers’ cognitive, behavioural, and emotional outcomes. Irrational beliefs are a set of thoughts about oneself, others, and the world, that are rigid, extreme, illogical, and non-empirical. Literature has demonstrated that holding irrational beliefs can be detrimental to one’s well-being and performance (Ellis, David, & Lynn (2010). Rational and Irrational Beliefs: A historical and Conceptual Perspective. In Ellis, David, & Lynn (Eds). Rational and Irrational Beliefs: Research, Theory, and Clinical Practice (pp. 3-22). Oxford, UK: Oxford University Press.). However, the extent to which the use of irrational language by leaders can influence the irrational thoughts of followers remains unexplored. Using a performance context, this study investigated the leader-follower belief transaction and its impact on participants’ cognition and performance in a Stroop test competition. We explored the differential effects of rational vs irrational leadership language styles on psychological outcomes and performance. This is the first study to examine the effects of manipulating language styles (rational vs irrational) on followers’ irrational beliefs. We hypothesised that participants in the irrational leader condition would: (1) endorse greater performance-related irrational beliefs, (2) demonstrate a greater performance decline from baseline to competition, (3) report a greater increase in performance anxiety compared to the rational condition, (4) report a greater increase in negative appraisal towards the performance compared to the rational condition, (5) report a greater decrease in performance-related self-efficacy compared to the rational condition. We recruited 73 participants (24 ± 5 years) from undergraduate (N=49), postgraduate (N=18), and doctorate level (N=6) cohorts. Participants were recruited using convenience and snowball sampling via university platform (Moodle), SONA-system and Prolific. The participants came from MMU (N=10), Staffordshire (N=1), Salford University (N=2) and other universities (N=60). The study was granted institutional ethical approval and all participants completed informed consent before data collection. All data were collected using an online questionnaire (Qualtrics), a performance task (PsychoPy), and data were analysed using SPSS. Results demonstrate no significant between-groups differences in performance-related irrational beliefs (P = 0.158), performance-related appraisal (P = 0.640), performance anxiety (P = 0.587), self-efficacy (P = 0.392), or performance scores (P = 0.448). In other words, participants’ approach to performance was not impacted by leaders’ language style. Our null findings have several implications. First, the manipulation was not strong enough and maybe too subtle. Hence, we should consider making the language style more explicit in the next study. Secondly, it is possible that a single interaction with the leader is not enough. After all, we were observing acute responses to leadership behaviour and should consider observing the long-term effect of exposure to irrational language. Finally, the performance task was maybe deemed as not relevant or purposeful enough for the participants.

Some common fixed point results on ( psi, phi)-contraction

The aim of the paper is to obtain common fixed point theorems for ( psi, phi)-contraction under the generalized rational type condition in a complete metric space. Moreover, these theorems generalize recent well known results in the literature.

Technological Parameters of Microfiltration in the Production of Micellar Casein Concentrate

Background:: There are many different factors that influence the process of microfiltration, including membrane pore size, pressure, temperature, and membrane origin. Studying the joint influence of technological parameters in order to justify rational modes of microfiltration is relevant. Objective:: This research aimed to define the rational technological parameters of microfiltration, which allow to achieve the target parameters of retentate in the process of obtaining micellar casein concentrate. Methods:: Standard and modified methods and techniques have been used in the process of experimental research. The mathematical processing was carried out by methods of mathematical statistics according to several trials data at three stage sequence. Results:: As a result of experimental investigations, the applicability of ceramic membranes for microfiltration of skim milk has been shown. The rational pore size has been established as 0,1 μm. To obtain the micellar casein concentrate, it is advisably to carry out the microfiltration of skim milk to the mass fraction of dry solids in concentrate (13 ± 3) %, followed by two-phase diafiltration with a double volume of reverse osmosis water. The rational operating conditions, allowing to get the target value of protein fractions correlation, have been established, as described as follows: input pressure as 0,2 – 0,3 MPa, and temperature as 10 – 15°С. Conclusion:: The analysis of microfiltration concentrates and permeates composition of raw milk, including vitamins and minerals content, showed both their high nutritional and biological value and the viability of further processing into food ingredients, including the ingredients for the specialized food products.

Perfection of an Energy-Economic and Environmental Parameters of the Ground Source Heat Pump Systems with Preventing Freezing of the Soil around Ground Pipes

This article is devoted to the methods for perfection of energy, economic factors, environ-mental factors and work modes of the ground source heat pump systems with the account of climate conditions. The purpose of the work is to predict and prevent freezing of the soil during long term of exploitation of the low-power and high-power ground source heat pump systems for justifying rational conditions of implementation GSHP in Ukraine and South-East Regions of Europe. This goal is achieved by solving the following problems: determining the energy-economic and environmental factors based on considering the work modes of the ground source heat pumps; evaluation of the operating efficiency of ground source heat pump systems based on minimizing fuel consumption and green-house gas emissions; perfection of solutions enable implementation of ground source heat pumps friendly to the environment and justifying rational conditions of implementation the ground source heat pumps for residential sector. The important results of the work are the obtained and analyzed data on the influence of energy and economic factors both environmental criteria on the work modes and scheme-constructive solutions of ground source heat pumps. Modeling of heat exchange processes in the soil around the soil tube shows that in order to avoid freezing of the soil, the minimum permissible specific number of vertical tubes should be at least 0.12–0.15 pieces/m2 of heated area. The significance of the results consists in the possibility of using the results of numerical simulation for preventing freezing of the soil around ground pipes of the ground source heat pump systems.

Optimal Mechanism in a Dynamic Stochastic Knapsack Environment

This study introduces an optimal mechanism in a dynamic stochastic knapsack environment. The model features a single seller who has a fixed quantity of a perfectly divisible item. Impatient buyers with a piece-wise linear utility function arrive randomly and they report the two-dimensional private information: marginal value and demanded quantity. We derive a revenue-maximizing dynamic mechanism in a finite discrete time framework that satisfies incentive compatibility, individual rationality, and feasibility conditions. This is achieved by characterizing buyers' utility and utilizing the Bellman equation. Moreover, we establish the essential penalty scheme for incentive compatibility, as well as the allocation and payment policies. Lastly, we propose algorithms to approximate the optimal policy, based on the Monte Carlo simulation-based regression method and reinforcement learning.

Development of rational conditions for cold rolling of AD33 alloy tapes on an industrial 175 × 300 mill using the results of computer simulation

Development of rational conditions for cold rolling of AD33 alloy tapes on an industrial 175 × 300 mill using the results of computer simulation

Degradation of diazine dye safranin T using potassium persulfate activated by ultrasonic treatment and MnFe2O4 spinel nanoparticles

An advanced oxidation process of ultrasound/MnFe2O4/K2S2O8 was developed for the degradation of diazine dye safranin T, according to which potassium persulfate was co-activated by ultrasonic (US) cavitation and MnFe2O4 spinel nanoparticles synthesized via co-precipitation in the ultrasonic field. A synthesis product annealed at a temperature of 4000C, with an average size of MnFe2O4 crystallites of about 7 nm, was used as a catalyst for the decomposition of potassium persulfate. Based on the results of experimental studies on the influence of various factors on the degree and rate constant of safranin T oxidative degradation, as well as considering energy and resource-saving principles, the rational conditions of oxidative degradation were determined as follows: the reaction medium temperature of 600C, the molar ratio of safranin T:K2S2O8=1:100, the catalyst loading of 0.1 g/l, and the specific power of the ultrasonic cavitation treatment of 51.0 W/l. It was established that under such conditions the oxidative degradation degree of safranin T was equal to 98.3%, and the rate constant was 1.510–3 s–1. The changes in the UV-Vis spectra of safranin T, namely a decrease in the intensity of absorption bands, both in the visible (at a wavelength of 520 nm) and in the UV (at a wavelength of 275 nm) regions of the spectrum, confirmed the degradation of safranin T. In addition, the absence of the appearance of new peaks in the visible and UV regions of the spectrum indicated mineralization of the dye.

Normative powers without conventions

ABSTRACT What exactly do we need to do in order to make a promise, or to exercise some other normative power? On a view relied on by many philosophers writing on promising, consent, and related phenomena, the answer is that we must communicate a suitable kind of intention. On this view, power-conferring principles assert that specific normative consequences, determined in part by the content of the communicated intention, attach to such communicative acts, and these principles need not be socially practised or accepted to be true. The paper offers a defense of this convention-independent view against the forceful challenge developed by Jed Lewinsohn in ‘The “Natural Unintelligibility” of Normative Powers’. Lewinsohn appeals to action-theoretic considerations to show that the relevant type of communicative act could not be performed under conditions of rationality and full information, and that therefore promissory power and other normative powers require the existence of social rules conferring such powers. The defense of the view targeted by Lewinsohn turns partly on the exact content of plausible constraints on the intelligibility of actions done with a particular aim, and partly on the question just how the social acceptance of power-conferring rules should be thought to matter.

Теоретические исследования использования сельскохозяйственной техники

The article briefly outlines the theoretical foundations of agricultural machine use. An assessment of energy costs in the performance of agricultural processes is given on the basis of the rational formula of academician V. P. Goryachkin. The recommendation is given for the use of various research methods (inductive, deductive) of working processes of agricultural machines and implements in rational conditions. The processes of changing the resistance of the plow depending on the speed (plowing depth is constant) have been studied experimentally. The nature of the influence of speed on power consumption during plow operation at great depth has been established.

МЕТОДЫ УПРАВЛЕНИЯ ЭФФЕКТОМ НЕПРИНЯТИЯ ПОТЕРЬ НА ФИНАНСОВЫХ РЫНКАХ

The article reveals the concept of loss aversion as an economic entity. In the behavioral economy, the concept of loss aversion can be considered from the point of view of psychological and behavioral aspects affecting decision -making decisions. The behavioral economy is studying how people make decisions in conditions of limited rationality, emotional factors and insufficient information. In the context of the behavioral economy, loss aversion can be explained using concepts such as loss of losses, cognitive distortions, the effect of drowned value, etc. The article contains a description of the influence of the principle of failure to accept losses on the participants in the financial market. The author reveals the signs and behaviors of the participants in the financial market when the phenomenon of failure of loss is influenced by them. In the conclusion, a list of principles that serve to overcome the impact of the effect of failure of losses in situations of decision -making by economic entities is revealed.

New fixed point theorems in dynamic property under rational contractive condition with application

New fixed point theorems in dynamic property under rational contractive condition with application