Power Product Research Articles

Rolling schedule design for the ESP rolling process based on NSGA-II-DE.

Multiple processes connected closely during the endless strip production (ESP) rolling, it is difficult to obtain the global optimal solution by multi-objective modelling of a single process, and the parameters to be optimized coupled with each other. To obtain the optimal solution, a multi-objective optimization model combining the power consumption, product quality, and loading balance was proposed for the design of an ESP rolling schedule. The thickness and heating temperature were simultaneously taken as the decision variables for coupling the temperature and loading in the rolling process, and the non-dominated sorting genetic algorithm-II (NSGA-II) based on differential evolution (NSGA-II-DE) was applied to obtain the Pareto solutions. To select an optimal solution, a satisfaction function was designed and applied to fully utilize the Pareto solutions. Furthermore, to prove the precision and efficiency of the method, the online schedule and that obtained by the NSGA-II method were compared. The results proved that the final selected solution had better quality and a more balanced loading force than the other two types, which could provide guidance for the actual production process.

Turning the non-pathogenic yeast Starmerella bombicola into a powerful long-chain dicarboxylic acid production host.

Bio-based long-chain dicarboxylic acids (LCDAs) are in high demand in the polymer industry. These compounds have diverse applications as building blocks for polymers with distinct features, which lead to a fast-growing global LCDA market. However, bio-based LCDA production is currently limited in Europe as established processes are using the pathogenic yeast Candida tropicalis. Therefore, this study aimed to establish safe and sustainable LCDA production using an industrially relevant non-pathogenic yeast, Starmerella bombicola. The metabolic network was successfully controlled to channel fatty acids from rapeseed oil into the ω-oxidation for the high production of LCDAs. Importantly, the engineered yeast strain produced 5.5 g/l of total LCDAs in shake flasks. Furthermore, pH optimization of the bioprocess resulted in a significant improvement of the total LCDA titer up to 117.8 g/l. The outcomes strongly demonstrate that S. bombicola can serve as a safe and efficient platform microorganism for industrial LCDA production.

Methane production related to microbiota in dairy cattle feces.

Methane (CH4) emission from livestock feces, led by ruminants, shows a profound impact on global warming. Despite this, we have almost no information on the syntrophy of the intact microbiome metabolisms, from carbohydrates to the one-carbon units, covering multiple stages of ruminant development. In this study, syntrophic effects of polysaccharide degradation and acetate-producing bacteria, and methanogenic archaea were revealed through metagenome-assembled genomes from water saturated dairy cattle feces. Although CH4 is thought to be produced by archaea, more edges, nodes, and balanced interaction types revealed by network analysis provided a closed bacteria-archaea network. The CH4 production potential and pathways were further evaluated through dynamic, thermodynamic and 13C stable isotope analysis. The powerful CH4 production potential benefited from the metabolic flux: classical polysaccharides, soluble sugar (glucose, galactose, lactose), acetate, and CH4 produced via typical acetoclastic methanogenesis. In comparison, a cooperative model dominated by hydrogenotrophic methanogenic archaea presented a weak ability to generate CH4. Our findings comprehensively link carbon and CH4 metabolism paradigm to specific microbial lineages which are shaped related to developmental stages of the dairy cattle, directing influencing global warming from livestock and waste treatment.

Development of a Large-Scale Integrated Solar-Biomass Thermal Facility for Green Production of Useful Outputs

The present paper develops a new multigeneration plant to produce multiple commodities from two combined renewable energy sources, solar thermal and biomass and considers a specific case study administered for the city of Al Lith in the Kingdom of Saudi Arabia. The plant generates power, heating, refrigeration, hydrogen, chlorine, concentrated sodium hydroxide, ammonia, urea, and fresh water, which are commodities at high demand in the area. The energy efficiency is determined to be 53% with an annual generation of over 1036 GWh of power and cogenerated 858 GWh of heating, nearly 23 GWh of refrigeration effect, over 11,300 tons of ammonia, almost 1800 tons of urea, over 113,000 tons of concentrated sodium hydroxide and over 905,000 m3 of fresh water. The exergy contents of heating, refrigeration, power and commodity products represent a total of 45% of the sources, which leads to a multigeneration platform's exergy efficiency. The system includes an integrated biomass gasification combined cycle with a biomass oxy-gasifier. The Aspen Plus simulations of the oxy-gasifier determined that the oxygen-to-biomass weight fraction should be set to 0.15, whereas the steam-to-biomass weight fraction is around 0.1. The exhaust gas recirculation is applied to enhance power generation rate and efficiency. The recirculation ratio of exhaust gas is found to be 0.21 if power generation efficiency is to be maximized and 0.28 if the power generation rate is to be maximized. The fluctuating and intermittent nature of the solar energy resource causes poor economics when this energy is to be captured in isolation or itself only. The current paper demonstrates that the hybridization of solar and biomass energy together with integrated processes for multiproduct generation enhances the overall competitivity of the renewable energy system. To address this aspect, the objective of the paper is to develop and assess a new integrated flowsheet for hybrid renewable resource multigeneration.

포스트 아포칼립스 영화 속 공간의 정치학

Post-apocalypse describes a human society that has become lawless due to the collapse of the social system destroyed after the destruction, and examines various elements of modern society such as human nature, desire, social system, and power. Recently, Korean post-apocalyptic content has gained public sympathy by depicting political and social anxiety that has long dominated Korean society, such as class inequality, corrupt power, and moral dilemmas. This study analyzed the space in Korean post-apocalyptic content based on Henri Lefebvre's spatial theory. As a result, it was confirmed that the apartment in <Concrete Utopia> functions as a space for survival and a place where hierarchical power structures are reproduced, which has the typical characteristics of the represented space described by Lefebvre. The space in the content is not simply a tool that reflects reality, but can also function as a space for social criticism and resistance. Through space, the content makes the audience face the inequality of modern society, the government's incompetence, and the contradictions of capitalism, and implies that space is a tool that reinforces power and class. This shows that, as Lefebvre argued, space functions as a product of power and a place that contains the possibility of resistance. In other words, the space in Korean post-apocalyptic content is an important device that visually reproduces social structures and power relations. Through this space, we can see that Korean post-apocalyptic content reflects the anxiety and conflict of modern society, and plays an important role in forming and criticizing social discourse by visualizing the reproduction of power and hierarchical conflict.

Business Strategy and Finance research of Honda Motor Company, Ltd

This article presents a comprehensive analysis of Honda Motor Company, Ltd, examining its business segments, financial performance, and strategic positioning to identify key areas for improvement. It highlights the automobile segment as the main revenue driver and employs Porter's Five Forces and the 9Ms model to assess Honda's competitive strengths and resources. The article also categorizes stakeholders using the Mendelow matrix and explores strategic options with Ansoff's matrix and the Boston Consulting Group model. A financial comparison with Toyota from 2018 to 2020 reveals areas where Honda's profitability and liquidity could be enhanced. The article concludes with recommendations to reduce operational costs, optimize asset investments, improve inventory turnover, extend payable terms, mitigate losses in the power products segment, and increase investment in new power vehicles, all while emphasizing corporate social responsibility. Despite existing weaknesses, the article confirms Honda's strategic direction and competitive strength in the global automotive market.

Research on the Theory of Power in Foucaults Mid-term Thoughts

Abstract: The concept of power is deeply rooted in everyday life, making it difficult to escape the dominant status assigned by the world. The issue of power is central to Foucaults field of study, where he innovatively proposed a productive view of power and explored its internal relationship with knowledge and subjectivity from a micro-power perspective. On one hand, Foucault posits that the subject is a product of power and primarily analyzes three ways in which power produces subjects, introducing the theory of the death of the subject in modernity. On the other hand, Foucault elucidates the relationship between power and knowledge, asserting that power produces knowledge, but it must also rely on the creation of discourse for its implementation and circulation. This paper then focuses on Foucaults theory of disciplinary power, analyzing how the technologies of discipline in the operation of modern micro-power tame the bodies of modern subjects, thereby forming a disciplinary society. The model of power over the body shifts from the harsh penal practices of the classical period to modern disciplinary training. Foucaults theory of power marks an important turning point in the history of Western philosophy, and his theory of biopolitics provides an innovative understanding of the concept of power from macro to micro levels.

The Relationship Between CEO Power, Labor Productivity, and Company Value in the Iraqi Stock Exchange

The current study investigates the relationship between the CEO’s power, the workforce’s productivity, and the company’s value in Iraqi stock exchange companies. A sample of 34 companies listed on the Iraqi Stock Exchange from 2016 to 2021 was tested using a multiple regression model, a panel data approach, and a fixed effects model. CEO power is measured by the busing factor analysis approach, which integrates four indices: CEO salary, CEO ownership, CEO tenure, and CEO control over board members. The findings indicate a positive and significant relationship between CEO power and labor productivity. Also, there is a negative and significant relationship between CEO power and the stickiness of labor costs. On the other hand, we found a positive and significant relationship between the CEO power and firm value. In addition, labor cost stickiness has a positive effect on firm value. By highlighting the CEOs’ power, this research tries to increase companies’ attention to this issue and its effect on improving employment productivity, cost management, and firm value.

Innovative heat sink design for enhanced cooling efficiency in Dual Active Bridge (DAB) topology

Abstract After in-depth research and analysis, aiming at the heat generation mechanism and limitations of the current heat dissipation method, this paper proposes an innovative heat dissipation design scheme. By optimizing the structural design of the heat sink, the heat dissipation surface area is increased, thus achieving more efficient heat emission and maintaining the optimal operating temperature of the equipment. Experimental data show that this new heat dissipation design significantly improves the cooling efficiency, an increase of about 60%, and provides support for the performance improvement of high-power power products, which brings a reliable and efficient cooling solution for related industries.

Remanufacturing construction and demolition waste and incineration ashes into eco-blocks: Quantitative sustainability assessment

This study performed a sustainability evaluation of a proposed business for remanufacturing concrete materials from construction and demolition waste (CDW) and ash from the combustion of municipal solid waste (MSW) to produce eco-blocks for construction applications. Six possible industrial remanufacturing alternatives are proposed based on commercially available industrial machinery and their economic sustainability was compared by a cost and profit feasibility study. Furthermore, the technical feasibility was evaluated by considering the maturity of the selected machinery based on the relationships among the cost–productivity, power–productivity, and number of workers–productivity pairs. The proposed remanufacturing business achieves a maximum profit of 17,643 USD/day with a minimum remanufacturing cost of 30.65 USD/t for the production of 529 t of eco-blocks in an 8-h factory shift. A quantitative environmental sustainability assessment was performed using the remanufacturing cost, profit, concrete savings, energy savings, CO2 emission savings, and eco-cost savings as criteria based on demographic statistics from the literature for current and predicted CDW and MSW generation. CDW and incineration ash are widely available, so the proposed process is viable worldwide. Based on the technical, economic, and environmental sustainability results, a final sustainability index of 0.874 was calculated, which exceeds literature thresholds for a sustainable business, indicating that the proposed eco-block remanufacturing process has the potential to generate substantial profits, while positively contributing to reducing waste and energy usage by recovering valuable resources and producing value-added products. The remanufactured eco-blocks are prepared in the same way as typical concrete blocks and can be used for all of the same residential, commercial, and industrial construction and landscaping applications. The remanufactured eco-blocks have several advantages over typical concrete blocks, including a much lower manufacturing cost (∼50 % lower), significant environmental and resource savings by avoiding the use of new sand and gravel resources, and improved mechanical properties.

Extending Non-Perturbative Simulation Techniques for Open-Quantum Systems to Excited-State Proton Transfer and Ultrafast Non-Adiabatic Dynamics.

Excited state proton transfer is an ubiquitous phenomenon in biology and chemistry, spanning from the ultrafast reactions of photobases and acids to light-driven, enzymatic catalysis and photosynthesis. However, the simulation of such dynamics involves multiple challenges, since high-dimensional, out-of-equilibrium vibronic states play a crucial role, while a fully quantum description of the proton's dissipative, real-space dynamics is also required. In this work, we extend the powerful matrix product state approach to open quantum systems (TEDOPA) to study these demanding dynamics, and also more general nonadiabatic processes that can appear in complex photochemistry subject to strong laser driving. As an illustration, we initially consider an open model of a four-level electronic system interacting with hundreds of intramolecular vibrations that drive ultrafast excited state proton transfer, as well as an explicit photonic environment that allows us to directly monitor the resulting dual fluorescence in this system. We then demonstrate how to include a continuous "reaction coordinate" of the proton transfer that allows numerically exact simulations that can be understood, visualized and interpreted in the familiar language of diabatic and adiabatic dynamics on potential surfaces, while also retaining an exact quantum treatment of dissipation and driving effects that could be used to study diverse problems in ultrafast photochemistry.

Exploring advanced antimicrobial effects of Pediococcus pentosaceus and Lactococcus lactis derived from Bufo gargarizans: In vitro analysis and in vivo evaluation in mice

With the context of increasing global concern about antibiotic resistance, the study presented the antibacterial properties of two novel edible bacterial strains, Pediococcus pentosaceus TE0302 and Lactococcus lactis TE0801, derived from the unique ecosystem of Bufo gargarizans. Significant antibacterial efficacy of these strains, with inhibitory zones of 14.77 mm and 15.26 mm, were confirmed through a multi-omics approach involving agar diffusion assays, mouse models, metabolomics, and genomics. These strains also mitigate pathogen-induced colitis and improve gut microbiota by increasing beneficial bacteria and reducing harmful ones. A crucial investigation is that the bacteria's substantial production of N-butyric acid is linked to antimicrobial effectiveness with a correlation coefficient ≥0.972. Genomic analysis shown that these strains feature diverse biosynthetic pathways similar to established antibiotics like Tetracycline and Vancomycin and contain genes for powerful bacteriocin production, especially Enterolysin_A. Pan-genome analysis indicated the unique gene counts of 124 and 179, greatly enhanced the genomic diversity compared to typical reference strains to emphasize the novelty. This study can facilitate a clear understanding of probiotics' genetic and biochemical properties. It highlighted the pivotal role in providing sustainable solutions to combat antibiotic resistance and improve gastrointestinal health, foreshadowing a new era of food science biotechnology.

Misconceptions and Errors Among Grade 12 Students When Learning Differentiation Rules: A Case Study

t is an established fact that some grade 12 students learning differentiation in calculus are found struggling with the rule of differentiation and these rules include power rule, quotient rule, chain rule and product rule. Because of these, some students came up with some misconceptions which eventually resulted to the students having multiple errors when learning rules of differentiation. The reason associated with these common errors are not far from their failure to model some prerequisite knowledge in the laws of logarithm into their learning of the laws of differentiation. And this has resulted to the poor performance of some students in mathematics (calculus) since calculus carries about 40% in the overall grade in mathematics as a subject at grade 12 level. On this note, this paper presents an analysis of students’ errors and misconceptions in learning differentiation rule. The study was conducted among grade 12 students preparing for NSC examination in a high school in Limpopo province in South Africa. And the data was initially collected using 35 test scripts of grade 12 on the topic of differentiation and differentiation rule. A qualitative approach was considered, and the data collected was analysed, focusing on product rules, quotient rules and chain rules and the errors committed. The result of the study indicated that some grade 12 students make some errors and misconceptions in differentiation rules. And these were because of poor conceptual understanding, poor mathematics language understanding, and some other error. It was confirmed that the results of this study highlight the common mistakes and errors students make when learning differentiation rules, and these errors are; conceptual, systemic, language, and generalization errors.

Analysis of Temperature effect on Power Productivity of Solar Panels in Residence Area

Analysis of Temperature effect on Power Productivity of Solar Panels in Residence Area

Protective effect of propolis in protecting against radiation-induced oxidative stress in the liver as a distant organ

Stresses caused by ionizing radiation can also damage tissues and organs through the circulatory system. In this study, we aimed to determine the radioprotective effect of propolis, a natural and powerful antioxidant product, against oxidative liver damage caused by cranial irradiation. Thirty-two male albino Sprague–Dawley rats, divided into four groups, were designed as sham group, irradiation (IR) group, propolis plus IR, control group of propolis. Biochemical parameters were measured in liver tissue of rats. While Total enzymatic superoxide scavenging activity (TSSA) and non-enzymatic superoxide scavenging activity (NSSA), glutathione peroxidase (GSH-Px) activities of all groups were statistically significantly higher than rats receiving only-irradiation, Glutathione-S-transferase (GST) activity in the IR group was significantly lower than in the sham control group and IR + propolis group. Superoxide dismutase (SOD) activity in the IR group was found to be significantly higher than both the sham control group and the propolis control group, but lower than the IR + propolis group. Malondialdehyde level and xanthine oxidase activity were higher in the IR group than in the other groups. Compared to the sham control group, in the group treated with propolis, a significant elevation in antioxidant parameters, specifically TSSA, NSSA, SOD, and GST activities, was noted, with corresponding increases of 32.3%, 23.2%, 47.6%, and 22.6%, respectively. Our findings show that propolis can be a radioprotective agent against ionized radiation damage by increasing antioxidant activity and reducing oxidant stress in liver tissue.

إنتاج الليبازالبارد – النشط بواسطة فيوزاريوم سولاني

The current study aimed to the production and partial purification of a cold-active lipase by some fungi isolated from the olive oil processing wastes in Al-Gabal Al-Gharby, Libya. 31 fungal species from 12 genera were isolated. F.solani was the most prevalent comprising 94% of total Fusarium and 28.7% of total fungi, 102 fungal isolates were tested for their lipolytic activity on lipase production agar medium at 10 and 20°C. The most active isolates were Alternaria (2 isolates), Fusarium, and Penicillium (1isolate for each one). Molecular identification of the most active four isolates was carried out by their sequencing (ITS). The four powerful fungal strains' production of cold-active lipase was maximized by optimizing some nutritional and environmental factors. F. solani AUMC 16063 was able to produce the maximum amount of lipase activity (46.66U/mL/min) with specific activity (202.8U/mg), utilizing ammonium sulphate as a nitrogen source after 8 days of incubation at pH 3.0 and 15°C. However, at same condition after 6 days when yeast extract was employed as a nitrogen source, the generated cold-active lipase displayed the highest specific activity of (1550U/mg) and lipase activity (36.74U/ml/min). This is the first study in which the production, partial purification, maximized and characterization of a cold-active lipase enzyme by Fusarium solani.

Circular economy: Extending end-of-life strategies

The transition from linear economy to circular economy (CE) has gained mainstream status in recent times, not only at product and process levels, but also at component level. In order to adopt the CE as common practice, there is a need to reimagine the product end-of-life (EoL) phase to include assessment of individual component health status. Implementation of EoL strategies on products designed based on wear and tear, robustness, and safety concerns is, however, complex. The purpose of this study is to explore the potential of designing for CE by applying a visual health-based analysis (VHA) at the component level at the EoL stage. The application of this diagnostic tool is exemplified in a case at a large Swedish outdoor power product manufacturer by analyzing components for reuse, remanufacture, refurbishment, recycling, and recovery strategies. The VHA results in the calculation of a CE potential at the component-product level based on individual component's cost, complexity, health, and diagnostic approach. This study presents a diagnostic tool for practitioners to understand circularity at the component-level in the effort to identify EoL strategies. Furthermore, in supporting the CE principle of maximizing resource recovery, the study potentially contributes to the EU's CE action plan and the UN-SDGs 8, 9, 12, and 13.

Enhanced formula-based method to estimate burnup, initial enrichment, and cooling time using limited gamma-ray source data of reference PWR spent nuclear fuel assemblies

This study proposes a framework to develop a model for estimating burnup (BU), initial enrichment (IE), and cooling time (CT) of spent nuclear fuel (SNF) overcoming the limitations of existing models in determining IE. Database (DB) of gamma-ray sources for PWR SNF was generated using ORIGAMI. Target gamma radionuclides were selected based on the ease and credibility of measurement. The concept of Product of Powers of Radioactivity (PPR) was suggested, and PPRs for modeling were selected through evaluation of all possible PPRs. Functions established for PPRs were applied to estimate BU, IE, and CT (BIC) of PWR SNF assemblies. Optimized PPR combinations for estimating BU, IE, and CT respectively, as well as three variables simultaneously with the highest accuracy, were suggested. The estimation model proposed in this study enhanced IE estimations, maintaining the reliability of BU and CT estimations. The above framework enables construction of intuitive BIC estimation models using only a small amount of data. This can help hasten the development of estimation models for SNF from various reactor types. Consequently, it is expected to contribute to the safety and safeguards of SNF management by improving the verification that SNF meets acceptance criteria and conforms to the declared information.

Automated Feedback on Student Attempts to Produce a Set of Dimensionless Power Products from a Set of Physical Quantities that Describe a Physical Problem

Formative feedback is important in learning. Automating the provision of specific, objective, constructive feedback to large cohorts requires complex algorithms that most teachers do not have time to develop, suggesting that a community effort is needed to create a library of specialised algorithms. We present an exemplar algorithm for a class of tasks in ‘dimensional analysis’ relating to the Buckingham Pi theorem. The challenge arises because there are infinitely many valid and invalid answers, but any valid answer is sufficient to complete a task. We present an algorithm that, given one valid reference answer, can evaluate any response to a task. The algorithm uses a vector-space formulation of the Pi theorem. Deployment across seven tasks for 380 students provided feedback 3,090 times, including stating why a response is invalid. The most common reason was that a student-proposed set was not dimensionless, but other educationally relevant reasons were also identified.

Comprehensive study and design optimization of a hybrid solar-biomass system for enhanced hydrogen production and carbon dioxide reduction

This study introduces an innovative multi-generation system powered by biomass, which aims to tackle the urgent problem of climate change by reducing CO2 emissions and increasing sustainability. The main problem being tackled is the ineffectiveness and environmental consequences of conventional biomass systems, which do not have methods for generating and injecting hydrogen. The proposed method combines solar panels with proton exchange membrane electrolyzers to generate green hydrogen, hence improving the quality of combustion byproducts. The methods utilized consist of integrating a supercritical carbon dioxide cycle with a thermoelectric generator to enhance the efficiency and cost-effectiveness of power generation. Additionally, flue gas condensation, a multi-effect desalination unit, and efficient waste heat recovery are employed to maximize the utilization of passive energy. The study concludes that under the optimal design, the proposed system outperforms the standard model that exclusively depends on biomass. The key results demonstrates that these characteristics are clearly demonstrated by its superior net power productivity of 3927 kW, exergy efficiency of 32.9 %, and drinkable water production rate of 9.4 kg/s. In addition, the suggested system has a lower levelized energy cost of 17.6 dollars per megawatt-hour and an emission index of 75.5 kg per MWh. However, upon comparing the rates at which exergy is being destroyed, it becomes evident that the majority of the components in the proposed model, such as photovoltaic panels and the electrolyzer unit, have a higher rate of exergy destruction. Ultimately, it can be noted that the fluctuations in combustion and turbine inlet temperature are crucial design parameters that substantially influence the power cycle and the system’s overall performance.