Production Technology Research Articles

Methodology for determining the heat distribution in disc brakes of mine hoisting machines

Purpose. To study the course of heat phenomena in disc brakes using modern computing systems in order to determine and substantiate the operating parameters for the hoisting machine components. Methodology. The research uses software packages, with the help of which a computational-theoretical apparatus is developed for heat mode modeling processes. In particular, the mentioned function is used in the SolidWorks Simulation software with the ability to evaluate the errors of the calculation results. Findings. In the course of the research, the dependence of the hoisting machine disc brake performance on the operating parameters of its components was determined. The research has led to a better understanding of the heat transfer processes in disc braking devices, as well as the ability to study the friction response of various materials and determine optimal parameters that help improve the performance of braking systems. The effectiveness has been proven of the proposed method for analyzing the heat distribution processes of the mine hoisting machine drum components under the influence of operating and emergency braking modes. Originality. For the first time, a methodology for calculating the heating temperature distribution along the brake rim plane during a safety stop has been developed and substantiated. A method has also been developed for determining the temperature field arising under steady-state heating conditions, which occur after repeated operating braking and cooling of the device. In this case, when using the formula for determining the temperature on the brake rim surface, the sample length, the relative velocity between the friction components and the heat flow distribution coefficient are taken into account. The brake disc geometric model developed in the SolidWorks software package makes it possible to study the temperature change on the device rim in real time. Practical value. The proposed design improvement based on the research results of heating processes should improve vehicle safety. The cost of braking systems is expected to be reduced through the use of optimal materials and production technologies. The software methods for modeling and analyzing the temperature influence on brake discs of the Mine Hoisting Machine (MHM) have been improved. Based on the research results, recommendations have been developed for the optimum braking process of machines in various operating conditions.

Pipe production cost management model based on graph theory

The pipe production process is a complex dynamical system with a significant number of production operations and interconnected cost localization centres. Purpose. To develop a mathematical model of the process of handling analytical information of a pipe enterprise using graph theory for the needs of cost management at each production stage. Methodology. Technological flow charts of the production job, where the list of mandatory activities and routing of the operating process are indicated, were used to organize cost accounting by operational centres of their localization with the help of computer modelling elements, namely the graph theory. The work used a complex of research methods, including analysis and scientific synthesis of scientific and technical information; theoretical studies; methods of mathematical and computer modelling, engineering developments. Findings. The cost accounting process is represented by a directed hypergraph. Each production operation is associated with a graph vertex. Each vertex is assigned to a series of interrelated marks: type of technological operation; weight factor; the value of direct costs for the operation; the value of indirect costs for the operation; the expense factor. The initial state of the hypergraph is specified by means of its initial marking, which corresponds to the set cipher of the batch of pipes and its weight. Further execution of the marked hypergraph is performed by running the allowed vertices. Marking of the graph ends if all the information from the technological flow charts of pipe products has been used. Originality. A model of cost management by operational centres is proposed which will allow dividing the prime cost of pipes which differ according to the production technology. It is recommended to rank pipe products within each technologically similar group for an economically feasible allocation of costs between batches of pipes. The proposed process model of processing analytical information of the pipe enterprise using graph theory will allow providing data governance as for the prime cost of each individual batch of pipe products, will contribute to the improvement in the order generation procedure taking into account the acquired information, and will allow making the appropriate adjustments when making management decisions. Practical value. Calculation of expenses for production operations allows one to identify the most cost-intensive of them. Relying on the results of the calculation, the enterprise management has the opportunity to manage costs at any stage of the production process. Moreover, the model allows determining the amount of consumed metal for each production operation, which is relevant for pipe enterprises. It is appropriate to focus further scientific developments in this direction on the possibility of managing non-manufacturing cost with the help of mathematical models in economics to optimize the supply and sales activities of the enterprise.

Progress on Si‐based photoelectrodes for industrial production of green hydrogen by solar‐driven water splitting

AbstractSolar power has been regarded as the ultimate green‐energy source because of its inexhaustibility and eco‐friendliness. The solar‐driven water‐splitting technology for green hydrogen production is considered to be one of effective ways for solar energy harvesting and storage, which may provide solutions for the energy crisis and environmental issues. In the past decades, great progress has been achieved in this area. Photoelectrochemical (PEC) water splitting is especially promising for the production of solar fuels because of expected large‐scale industrial application. Silicon (Si), as an ideal candidate for the photoelectrode, is the most suitable material for the PEC device in industrial photocatalytic water splitting because of its abundance, mature fabrication technology, and suitable band gap. Here, we give a systematic review on the recent progress for Si‐based photoelectrodes for water splitting with a focus on the industrial application. Particularly, the strategies, such as band‐alignment control, morphology design, and surface engineering, are summarized to enhance the PEC performance and durability for practical application. Furthermore, the perspective for the design of commercial Si‐based PEC devices with high PEC performance, long‐term stability, large‐size, and low cost are given at the end, which shall guide the development of PEC water splitting for industrial application.

Design and Implementation of Digital Twin Factory Synchronized in Real-Time Using MQTT

As information technology progresses, the need for digital transformation within the industrial sector has become increasingly apparent, and digital twin technology has emerged as a significant trend in manufacturing. Digital twins synchronize physical and digital environments, overcoming spatial and temporal limitations to create various added values that are unattainable in reality. This paper presents a model that integrates digital twin technology with production and operational technologies at manufacturing sites, enabling remote, centrally controlled manufacturing services that transcend physical constraints. Specifically, by utilizing Message Queuing Telemetry Transport (MQTT) for real-time synchronization, this approach ensures efficient and timely data transfer between physical and digital environments. While traditional approaches often encounter challenges due to high investment costs and design complexities, this paper proposes a cost-effective and practical solution that reflects actual factory conditions.

Financial Determinants of Adoption of Agricultural Technologies in Irish Potato Production in Ol Kalou Sub County, Kenya: Application of Multinomial Logistic Regression

Irish potato is a significant source of food and income for many households worldwide. The demand for the crop has steadily increased around the globe. Kenyan Irish potato farmers have the potential to produce about 30 tonnes per Ha. However, small-scale Irish farmers in the country realize low output ranging from 4-8 tonnes per Ha due to limited uptake of agricultural technologies. This study aimed to analyze the financial factors influencing the uptake of agricultural technologies in Irish potato production in Ol Kalou Sub County. The agricultural technologies under investigation were chemical fertilizer, certified seeds, fungicides, and farm machinery. Production and innovation diffusion theories guided the study. Descriptive cross-sectional research design was used to obtain data from a study population of 21,942 smallholder Irish potato farmers in Ol Kalou Sub County. A multiple-stage sampling technique was employed to give a sample size of 385 respondents small scale Irish potato farmers, where data was collected through a semi-structured questionnaire. Data collected was analyzed using multinomial logistic regression through SPSS version 28 and STATA version 17. The model indicated that off-farm income, access to credit, and production risk had a positive and significant influence on adopting agricultural technologies. Conversely, production cost had a negative and significant influence on the adoption of agricultural technologies, while the availability of subsidies had no significant influence. The Marginal effect analysis showed that the availability of off-farm income increased adoption by 22.00%, the increase in credit increased adoption by 2.00%, the availability of mitigation measures of production risk increased adoption by 19.00%, while the increase in production cost decreased adoption by 7.00%. The study concluded that off-farm income, credit facilities, production risk and cost of production influence the adoption of agricultural technologies. The study recommended that the government should develop policy regulations such as diversification of income, grants that reduce production costs, credit incentives, and crop insurance.

Control Structures for Combined H2/Electricity from Offshore Wind Turbines

Wind energy proves to be a highly favourable choice for electricity generation due to its clean and renewable nature, and is playing a significant role in reducing global greenhouse gas emissions. Offshore wind turbine systems have gained widespread popularity as they can capitalise on elevated and consistent wind speeds surpassing those found in onshore locations, resulting in increased energy efficiency. Furthermore, offshore wind power possesses the potential to emerge as a significant electricity source for the production of green hydrogen. As water electrolysis technology for hydrogen production continues to advance, utilizing offshore wind power for hydrogen generation is becoming more economically viable and practical. Offshore wind power with higher wind speeds in combination with efficient control structures presents an attractive option for electricity generation and hydrogen co-production. This paper aims to present and evaluate four different production structures for combined H2/energy generation from offshore wind turbines. Previous research studies in this area often overlook control structures and lack information on power converter operations. In contrast, this article studies control structures that enable proper functionality and ensure adequate interoperability, enhancing the reliability of renewable energy integration. Each structure, including both wind turbines and electrolyser, is described in detail, along with the corresponding controllers. Simulation results are presented for each structure and controller to demonstrate their effective operation.

Comparative Analysis of Milling Technologies in Dark and Milk Cocoa Topping Production for Ice Cream

Chocolate and cocoa toppings are widely used for confectionery products. Toppings used for ice creams contain higher fat content (about 40-60%) to ensure a greater flow to cover the whole product. The dark cocoa topping consists of cocoa and sugar powder distributed in vegetable fat, while cocoa topping with the added 7% non-fat milk fraction is regarded as a milk cocoa topping. This research aimed to determine and compare the impact of the ball mill, and five-roll mill and conching used for the production of dark and milk cocoa toppings regarding the particle size distribution, rheology properties and content of moisture, sucrose, fat and lactose. The obtained results showed that the volume-weighted mean parameter D (4,3) was lower in the samples produced in a ball mill. Additionally, the viscosity, linear and Casson, slightly increased in samples produced in a ball mill except for the milk cocoa topping which had 0.55 fold higher value of linear viscosity compared to the sample produced using a five-roll mill and conching. Regarding the results of NIR spectroscopy, it was found that the samples produced in a ball mill showed higher values of moisture, but lower values of sucrose, lactose and fat.

State-of-the-art review on advancement in foam concrete production technology using mineral admixtures

State-of-the-art review on advancement in foam concrete production technology using mineral admixtures

Root Characteristics and Its Correlation with Yield of Some Maize (Zea mays L.) Genotypes in Bangladesh

The growth capacity and yield characteristics of crop plants are significantly influenced by their roots. To determine the influence of root characteristics and its correlation with yield of maize genotypes, an experiment was conducted at the experimental field of Department of Crop Botany and Tea Production Technology, Sylhet Agricultural University (SAU), Bangladesh during December 2014 to May 2015. The experimental materials were ZM 0001, ZM 0002, ZM 0003, ZM 0004, ZM 0005, ZM 0006, ZM 0007 and BARI Maize 6. Three replications and a Randomized Complete Block Design (RCBD) were used to set up the experiment. Necessary cultural practices were followed as and when require during the growing period. Data were recorded on number of roots plant-1, root length, root spreading until grain filling stage (90 days after germination) and dry matter accumulation of roots at 30 days interval until harvest. The results indicated that root number of maize genotypes increased from 30 to 90 DAG at a constant rate and in the grain filling stage and it was limited within 32.33 to 42.67. Root length was also increased from 30 to 90 DAG at a constant rate and in the grain filling stage it was limited within 25.33 to 31.1 cm. Root spreading was continued to increase from germination stage to 90 DAG and it was varied from 22 to 27.73 cm. Dry matter accumulation of roots increased gradually from 30 to 60 and 90 DAG up to harvest. In this study, root shoot ratio (RSR) and root weight ratio (RWR) had significant correlation with maize yield. From the root length and root spreading data, it is suggested that moderate tillage and a plant to plant distance spacing of 25-30 cm can be maintained for better yield of maize.

ASSESSING POTATO CULTIVATION TECHNIQUES IN PAKISTAN: AN ANALYSIS OF EXISTING METHODS AND IDENTIFIED GAPS

The potato is an important crop in vegetables. It is grown in sandy to clay-loamy soil in the winter season. Potassium and vitamin C are abundant in potatoes. Both governmental and private agriculture extension services actively educate farmers about suggested techniques for producing potatoes and offer guidance on how to implement these practices. This study aimed to investigate the discrepancy between accepted and advised potato production technology techniques. Pakistan's primary potato hub is Okara. Tehsil Okara was selected randomly from 3 tehsils (Okara, Depalpur, Renala Khurd) of district Okara. A random sampling was carried out for 120 Okara potato growers, the study's key data were gathered through a field survey. According to the survey, most farmers were aware of the suggested potato production technology and many had already embraced it. However, a sizable portion did not follow the advised guidelines. Therefore, to get a high yield of potatoes per acre, it is necessary to strengthen the efforts of extension services and implement more advanced advice. Extension activities must be adjusted to farmers' needs.

COMPLEXIDADE GEOECONÔMICA E AS ANÁLISES GEOGRÁFICAS REGIONAIS

The goal of the paper is to unravel the geo-economic complexity of regional agglomeration economies. For this one, the spatial focus is on the western region of Santa Catarina. The main result of cross-referencing the literature with empirical research data was to break the stereotype that the region under analysis is specialized purely and simply in agro-industrial production. In fact, it is a complex, specialized and diversified geo-economic dynamic; given the overflow of agro-industrial capital into other productive sectors, such as machinery and equipment, mechanical metal, renewable energy, meat production technologies, real estate investments and others. This led to the identification of four agglomeration economies with differences and similarities from a production point of view: Chapecó and Xanxerê, Concórdia and Joaçaba, Videira and Caçador and, finally, São Miguel do Oeste. Methodologically, the research considers three steps: 1) bibliographic and data collection; 2) fieldwork and technical visits; 3) organization, cross-referencing and qualification of the data collected. Keywords: Geo-Economics Complexity; Agglomeration of Economy; West of Santa Catarina.

Complementarities in R&D and Innovation Decisions: An Enquiry on an Extensive Sample of Latin American Companies

This study uses an extensive sample of company data referring to seven Latin American countries to analyze the potential influence of simultaneity and heterogeneity in determining decisions to commit to R&D and innovation outputs. First, the analysis focuses on the decisions about spending on in-house and external research. Second, the outcomes of three different innovations: process, product, and organizational. Choices were considered simultaneously by employing a multivariate probit estimation model. In so doing, the enquiry considered the possible systematic interdependencies among the decisions. The results indicate that the two R&D decisions are interdependent. However, a different picture emerged in relation to innovation outputs, in which the correlations coefficients were small with unexpected signs. This may indicate a structural weakness of the technological production system in Latin America, wherein the synergies, complementarities, and complex relationships usually involved in the process of innovation are not fully developed.

Microalgae–Nanoparticle Systems as an Alternative for Biogas Upgrading: A Review

Anaerobic digestion is a well-established technology for the sustainable production of biogas. However, to be used as a substitute for natural gas or as vehicle fuel, it is necessary to remove carbon dioxide (CO2) and other contaminants from biogas that can compromise the useful life of combustion engines. Upgraded biogas is known as biomethane (>95% methane content). This work reviews the different technologies used for upgrading biogas, emphasizing microalgae–nanoparticle systems, representing a more sustainable and environmentally friendly system. Parameters affecting these systems performance are discussed, and the trends and areas of opportunity for subsequent work are evaluated through a bibliometric analysis.

The Role of Technology and Automation in Streamlining Business Processes and Productivity for SMEs

Purpose: This research investigates the vital role of automation in enhancing business process efficiency and overall productivity within SMEs. It also discusses how technology can help overcome bottlenecks arising from human operation, resource limitation, and operational inefficiency, which have commonly been experienced by SMEs. Materials and Methods: The study combines an extensive review of existing literature with case studies from various industries to evaluate the effects of automation tools on SME operations. These tools range from cloud-based solutions to AI-powered systems, providing insights into their impact across different business processes. Findings: Research has shown that automation improves productivity in SMEs by up to 30%, reduces manual errors by 25%, and enhances data accuracy by improving employee focus on strategic tasks. In addition, the standardization of processes through automation ensures less variability in output. Automation also impacts customer experience positively by ensuring speed in service delivery and quality improvement in products. High upfront costs, however, combined with a shortage in skilled personnel and integrating new technologies with existing systems, remain barriers to wider adoption by SMEs. Implications to Theory, Practice and Policy: Accordingly, the study recommends that the following measures be taken to counteract the problems posed: phase in automation, cooperate with technology providers who will devise cost-effective solutions, and invest in comprehensive training programs to fill the skills gap. Government incentives, such as tax breaks and subsidies, could also push SMEs toward broader automation. Thereafter, successful integration of automation will enhance the competitiveness of SMEs and create a sustainable growth path in the digital economy.

Dynamic interactions among exchange rate, natural gas demand, production in manufacturing and battery industry export – evidence from Hungary

In the context of the current global economic transformation, the rapid rise of the electric vehicle industry has made the battery industry a new focus of competition among countries. Despite its relatively small economic and demographic size, Hungary has garnered significant academic interest by emerging as the world’s third-largest battery producer in 2021. The study employed a dynamic vector autoregressive (VAR) model to determine that fluctuations in the Hungarian exchange rate have a notable immediate influ-ence on exports in the battery business，which suggests that changes in exc-hange rates directly affect international competitiveness. The battery sector is experiencing a progressive increase in the influence of fluctuations in na-tural gas demand, particularly in terms of their impact on production costs and supply chains. The battery industry has had substantial advancements in technological innovation and production efficiency as a direct result of the expansion in manufacturing production. And Hungary’s total industrial deve-lopment is significantly influenced by the long-term effects of export expan-sion in the battery industry. JEL Codes: L62, E44, O14, C22

A Study on the Potential for the Application of Peanut Shells as a Reducer in the Process of Metal Recovery from Metallurgical Slags

Copper production technology is a complex process consisting of many stages. The combination of pyrometallurgical and hydrometallurgical stages, on the one hand, complicates production while, on the other hand, allowing for a relatively selective separation of intermediate or waste materials that can be subjected to the process of recovery of useful components. Materials of this type are characterised by a much higher copper content relative to the ore material. On the other hand, due to the oxide form, reduction processes are used in which coke is mainly applied. Reduction of the unfavourable phenomenon of CO2 emissions, in this case, can be performed through the use of bioreducers, which are characterised by an inert carbon footprint since the generation of carbon dioxides is the same as its absorption at the stage of vegetation and growth. In this paper, the topic of determining the feasibility of using selected bioreducers, such as peanut shells, to verify their suitability in the process of reducing copper oxides as well as the impact on the working components of the laboratory reactor in which the process is carried out are discussed. In this case, raw materials with a composition similar to the that of slags produced at the copper production stage in a flash furnace were tested for reduction. The results referring to reducing lead and copper contents above 88% Pb and 98% Cu indicate the great potential of this type of bioreducer. An additional advantage is the relatively wide availability of peanut resources. The effects of the copper reduction time on the degree of decopperisation performed with a constant reducer addition at 1300 °C were studied in this paper. Following 1 h of the process, the copper content in the slag was 0.78 wt%, while the longer process duration resulted in a copper fraction of 0.19 wt%. Considering lead, its content was 0.33 wt% after the reduction process.

EVALUATION OF INTERNET ACCESS BY STUDENTS AT A FEDERAL EDUCATIONAL INSTITUTION IN NORTHERN BRAZIL

Objective: This study presents the results of assessing Internet access by students at a federal educational institution in northern Brazil. Theoretical Framework: The study's theoretical framework relates information technologies through Internet access to learning. It shows that the more adequate Internet access is in educational institutions' daily routines, the better the students' performance in learning and its developments in technical, scientific, and technological production. Method: The method used was a survey, the population of which consisted of students who attended classes during the three shifts during which the institution operated. The students were consulted through a questionnaire with multiple-choice questions, the results of which were generated using descriptive statistics and presented in frequency tables. Results and Discussion: The findings showed deficiencies in a) the connection attributes, b) insufficient connection about the types of use by students, c) the connection provided is of low quality, and d) there is excess demand about the low institutional supply, especially in the evening shift. Research Implications: This study shows that internet services must be the object of multidisciplinary treatment and cannot represent the exclusive view of ICT professionals or education specialists. Unidisciplinary views prevent several fundamental nuances of institutional core activities from being overlooked. Originality/Value: The research's originality lies in the empirical observation that educational institutions must strategically plan long-term internet provision jointly by ICT professionals, education specialists, teachers, and students.

Trust and Safety work: internal governance of technology risks and harms

Abstract Trust and Safety work mitigates certain social risks and harms of digital technologies. In a landscape that is only slowly establishing regulatory oversight mechanisms, Trust and Safety work performs a type of internal governance by attempting to mitigate disinformation, online harassment, extremism, and other harms accelerated or amplified by technology products and services. With origins in content moderation, Trust and Safety work now also includes product advice for online services and IRL (in real life) products. Attention to Trust and Safety work can complicate a monolithic view of what tech work is and who does it, as well as point to locations for intervention as we seek to promote Public Interest Technology in globally impactful sociotechnical systems.

Technique of functional simulation as a tool for providing the required quality of fortified bakery products

Relevance. The problem of irrational and unbalanced nutrition is relevant for almost all regions of Russia. There is a need to enrich everyday products with micronutrients that are of particular importance in the diet. Fortified bread and bakery products with specified consumer properties in the diet can be one of such valuable products.Methods. The methodology of structural analysis and design of systems (Structured Analysis and Design Technique, SADT) is often used in life cycle management of complex high-tech products and has not found wide application in the food industry. The authors substantiate the need to introduce tools for functional and graphical modeling of business processes that implement the SADT methodology in life cycle management to ensure the quality of finished bakery products.Results. An original generalized functional and logical model of the process “To produce enriched bread (bakery products) with regionally significant micronutrients” has been developed. The analysis of the technology of enriched bakery products, carried out at various levels of decomposition of the process, revealed that the quality of the finished product is significantly influenced by the choice of the technological stage of applying the components of the mixture proposed for the enriching composition. It has been established that preference should be given to organic forms of additives — components of the enriching composition. To preserve the nutritional properties of bakery products, an enriching composition is proposed to be applied to the surface of the finished product. The proposed method has been tested in experimental production conditions. Its manufacturability and controllability of the proposed technical solutions are proved. The approach to functional and graphical modeling of food technologies developed by the authors on the example of bakery products opens up prospects for improving the quality of finished products and can be widely used in food engineering.

Mild polarization electric field in ultra-thin BN-Fe-graphene sandwich structure for efficient nitrogen reduction

The electrocatalytic N2 reduction reaction (NRR) is expected to supersede the traditional Haber-Bosch technology for NH3 production under ambient conditions. The activity and selectivity of electrochemical NRR are restricted to a strong polarized electric field induced by the catalyst, correct electron transfer direction, and electron tunneling distance between bare electrode and active sites. By coupling the chemical vapor deposition method with the poly(methyl methacylate)-transfer method, an ultrathin sandwich catalyst, i.e., Fe atoms (polarized electric field layer) sandwiched between ultrathin (within electron tunneling distance) BN (catalyst layer) and graphene film (conducting layer), is fabricated for electrocatalytic NRR. The sandwich catalyst not only controls the transfer of electrons to the BN surface in the correct direction under applied voltage but also suppresses hydrogen evolution reaction by constructing a neutral polarization electric field without metal exposure. The sandwich electrocatalyst NRR system achieve NH3 yield of 8.9 μg h−1 cm−2 and Faradaic Efficiency of 21.7%. The N2 adsorption, activation, and polarization electric field changes of three sandwich catalysts (BN-Fe-G, BN-Fe-BN, and G-Fe-G) during the electrocatalytic NRR are investigated by experiments and density functional theory simulations. Driven by applied voltage, the neutral polarized electric field induced by BN-Fe-G leads to the high activity of electrocatalytic NRR.