Separation Strategy Research Articles

Experimental study on Q-learning control of airfoil trailing-edge flow separation using plasma synthetic jets

In this paper, a continuous Q-learning algorithm is deployed to optimize the control strategy of a trailing-edge airfoil flow separation at a chord-based Reynolds number of 2×105. With plasma synthetic jets issued at the middle chord and a hot wire placed in the separated shear layer acting as the actuator and sensor, respectively, a high-speed reinforcement learning control at an interaction frequency of 500 Hz is realized by a field-programmable gate array. The results show that in the Q-learning control, the controller only needs several seconds to elevate the instantaneous reward to a level close to the final mean reward, and convergence of the control law typically takes less than 100 s. Although the relative drag reduction achieved by Q-learning control (10.2%) is only slightly higher than the best open-loop periodical control at F∗=4 (9.6%), the maximum power saving ratio is improved noticeably by 62.5%. Physically, Q-learning control creates more turbulent fluctuations, earning more rewards by increasing the transition possibilities toward high-value states. With increasing penalty strength of plasma actuation, the final control laws obtained from Q-learning exhibit a decreasing number of active states. Detailed comparisons between the open-loop and Q-learning control strategies show that the statistics of the controlled velocity fields remain similar, yet the turbulent fluctuations contributed by the vortex shedding mode are reduced by constant-frequency plasma actuation.

The route for commercial photoelectrochemical water splitting: a review of large-area devices and key upscaling challenges.

Green-hydrogen is considered a "key player" in the energy market for the upcoming decades. Among currently available hydrogen (H2) production processes, photoelectrochemical (PEC) water splitting has one of the lowest environmental impacts. However, it still presents prohibitively high production costs compared to more mature technologies, such as steam methane reforming. Therefore, the competitiveness of PEC water splitting must rely on its environmental and functional advantages, which are strongly linked to the reactor design, to the intrinsic properties of its components, and to their successful upscaling. This review gives special attention to the engineering aspects and categorizes PEC devices into four main types, according to the configuration of electrodes and strategies for gas separation: wired back-to-back, wireless back-to-back, wired side-by-side, and wired separated electrode membrane-free. Independently of the device architecture, the use of concentrated sunlight was found to be mandatory for achieving competitive green-H2 production. Additionally, feasible strategies for upscaling the key components of PEC devices, especially photoelectrodes, are urgently needed. In a pragmatic context, the way to move forward is to accept that PEC devices will operate close to their thermodynamic limits at large-scale, which requires a solid convergence between academics and industry. Research efforts must be redirected to: (i) build and demonstrate modular devices with a low-cost and highly recyclable embodiment; (ii) optimize thermal and power management; (iii) reduce ohmic losses; (iv) enhance the chemical stability towards a thousand hours; (v) couple solar concentrators with PEC devices; (vi) boost PEC-H2 production through the use of organic compounds; and (vii) reach consensual standardized methods for evaluating PEC devices, at both environmental and techno-economic levels. If these targets are not met in the next few years, the feasibility of PEC-H2 production and its acceptance by industry and by the general public will be seriously compromised.

Preparation of chiral metal–organic framework l-his-MIL-53-NH2@SiO2 composite by in situ growth and chiral post-modification strategies for HPLC enantiomeric separation

l-his-MIL-53-NH2@SiO2 core–shell composite microspheres were prepared by in situ growth and chiral post-modification strategies for chiral separation.

Rapid analysis of the chemical constituents in Qiangli Dingxuan tablets using ultra-performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry.

Qiangli Dingxuan (QLDX) tablet is a widely recognized traditional Chinese medicine formula that has been extensively used in China for decades to treat vertigo, tinnitus, and dizziness owing to its outstanding therapeutic outcomes. However, the complexity of the chemical components in this tablet makes it challenging to separate and identify these components. This study presented an effective and sensitive strategy for the rapid separation and simultaneous structural identification of QLDX tablet components using ultra-performance liquid chromatography with quadrupole time-of-flight tandem mass spectrometry and the UNIFI platform. Based on retention times, accurate masses, fragment ions, related literature, and authentic standards, 119 compounds were identified or tentatively characterized; these included 9 iridoids, 12 lignans, 21 phenylpropanoids, 27 flavonoids, 7 phthalides, and 43 others. Among them, 36 were confirmed using reference standards. The representative compounds with various chemical structures were studied by analyzing their fragmentation patterns and characteristic ions. In conclusion, this study established a rapid approach for characterizing the chemical constituents in QLDX tablet. The proposed approach provides a basis for qualitative analysis and quality control in the manufacturing process and is beneficial for advancing investigations into the efficacy and mechanism of action of this tablet.

Green and efficient separation of vanadium and chromium from high-chromium vanadium slag: a review of recent developments

Strategies for efficient extraction and separation of vanadium and chromium from high-chromium vanadium slag with green chemistry principles are summarized.

A highly efficient in situ redox stabilization strategy for Am-Cm separation using AgBiO3.

AgBiO3 is reported for the exclusive oxidation of Am3+ → AmO2+ at near-neutral pH conditions. Literature methods of AmO2+ generation are generally two-step processes; i.e., Am3+ → AmO22+ oxidation followed by AmO22+ → AmO2+ reduction. These methods for Am3+ → AmO2+ oxidation use high temperatures (80-100 °C) and/or several reagents, causing the in situ presence of the AmO2+-complex rather than the AmO2+aq ions. This not only interferes with the much-needed Am-Cm selectivity but also limits the use of AmO2+aq in any other experimental study. The single-step Am3+ → AmO2+ oxidation in the present work using AgBiO3 is done at 25 °C in a non-complexing medium at pH ∼4, making it a first-of-its-kind report. Am-Eu and Am-Cm separation in a single contact, with a separation factor >104, was achieved using the present method, which is unprecedented among aqueous feed solutions. The AmO2+ generated using the present method under non-complexing pH conditions makes it also suitable for exploring the fundamental chemistry of the higher valent americyl ion. A complexation study using the thus-generated AmO2+ ion with acetate ion supports the concept.

ОСОБЛИВОСТІ ДЕРЖАВНОГО РЕГУЛЮВАННЯ ЕКОЛОГІЗАЦІЇ АГРАРНОГО ВИРОБНИЦТВА

The article considers the ecologization of agricultural production as a key factor for the sustainable development of the agricultural sector, which ensures the production of environmentally friendly agricultural products. The necessity of adapting the agricultural sector to the new market conditions of management, where state regulation and support for the ecologization of agricultural production is important, which is aimed at reducing the negative impact of agricultural activities on the environment, is substantiated. The importance of the process of state regulation of the agricultural sector, aimed at ensuring the food security of the country and the priority increase in the efficiency of agricultural production, is investigated. The reasons for the negative impacts of the use of agricultural land due to hostilities on the territory of the country, which have worsened their ecological condition, are revealed. The main factors affecting the environmental situation in the agricultural sector of our country are highlighted. The basics of state policy in the field of environmental development of the agricultural sector of Ukraine are determined, which are represented by separate goals, concepts and strategies for its development in the domestic regulatory and legal legislation for the future. The main measures of ecologization of agricultural production are highlighted, which will contribute to the conservation of natural resources, increase environmental safety and sustainable development of the agricultural sector. The mechanism of state support for the ecologization of agricultural production, which acts as the legislative embodiment of the means of state regulation to ensure the development of agriculture on an environmental basis, is described. In order to ensure the process of ecologization of agricultural production, the components of such a mechanism are disclosed. The importance of forming a state strategy for the ecologization of agricultural production within the framework of the functioning of the mechanism of its state support is indicated. The main tasks of the authorities in the process of creating a system for managing the harmonization of agriculture and livestock relations are highlighted. It was found that effective state regulation and support for the ecologization of agricultural production ensures the creation of conditions for the formation of a developed and modern market of domestic high-quality environmental products, the rational use of natural resources and their preservation for future generations.

Research Model Analysis of Muscle Power and Measuring Methods

Momentum is one of the most common sources of power for collecting. This article is important in the development of human power as it is a motivational investigation into the wood chipping process. An effective computational framework was established for the following variables: the power required to accelerate the spinning wheel, arterial pressure rise, and time needed for achieving spinning wheel speed. Five people with different physical characteristics pedaled. The energy production unit and output necessary for every individual are to be evaluated. The method of cycling and engaging the power transmitter can be considered a different subject of inquiry in this study. A separate experimental strategy was devised to measure human energy, and many factors were identified for further investigation for the first time, an effort was made to calculate the amount of human power necessary to operate any machine. The originality of the present study is regarded as of the utmost significance since it is transferable to any mathematical framework developed.

Strategie akulturacyjne wśród międzynarodowych studentów anglojęzycznych programów zarządzania w Polsce

The primary objective of this study was to identify the acculturation strategies employed by international students enrolled in English-speaking management programs in Poland. The study employed two research models: the Tridimensional Acculturation Model developed by Ferguson et al. (2012) and the Relative Acculturation Extended Model (RAEM) proposed by Navas et al. (2005). Both models conceptualize acculturation as a multifaceted and context-dependent process. International students pursuing full-time management study programs exemplify a group susceptible to remote acculturation conditions (Ferguson and Bornstein, 2012). The study was based on in-depth interviews with 19 individuals and was carried out with the use of the Cultural Identity Mapping technique (Ferguson, 2018). Three acculturation strategies employed by students have been identified: separation (an orientation towards the culture of origin while rejecting elements of other cultures), integration (a simultaneous orientation towards two cultures), and multicultural strategy (an orientation towards more than two cultures). The identification of the third strategy contributes to ongoing discussions regarding the limitations of twodimensional acculturation models which fail to encapsulate the increasing complexity and diversity of individuals’ acculturation experiences (e.g., Sam & Ward, 2021; Rudmin, 2006). Finally, remote acculturation turned out to play an important role in the processes associated with the acquisition of the third culture.

Interlayer confinement mediated oxidation of americium by sodium bismuthate and stability of its higher redox states in acidic solution.

Mutual separation of trans-plutonium actinides (Ans) from lanthanides (Lns) or adjacent Ans is challenging as they exhibit great chemical similarity. Selective Am oxidation-based Am-Lns or Am-Cm separation strategies give very high separation factors. There exist several reports on different aspects of Am3+ oxidation by NaBiO3·xH2O (x = 2-3), which suggests that the oxidation mechanism is still not well understood. We, therefore, carefully performed several experiments taking advantage of the difference in the redox chemistry of Eu3+ and Am3+. The ion exchange of Eu3+ with the interlayer Na+ in NaBiO3 was confirmed by an ionic strength variation experiment. The shift in the 001 peak of NaBiO3 in XRD and the appearance of peaks corresponding to the trivalent Ln ions in XRF after Ln3+ loading give direct evidence for Na+ exchange with Ln3+. The stability of the higher oxidation state of Am was monitored spectrophotometrically. The experimental investigations also suggested the role of Am3+ → AmO22+ transformation in NaBiO3·xH2O (x = 2-3) dissolution even at pH ∼ 1, which otherwise is difficult to achieve even with >1 M HNO3. The role of colloidal NaBiO3 particles and dissolved BiO3- in controlling or stabilizing different oxidation states of Am was also discussed.

Bioinspired superwetting oil–water separation strategy: toward the era of openness

Bioinspired superwetting oil–water separation strategy is summarized from confined-space to open-space, from static to dynamic devices. Strategies are evaluated and compared and current challenges and feasible solutions are emphasized.

Multi-step PDMS curing and a controlled separation method for mass manufacturing of high-performance and user-friendly micro-devices: valved micropumps.

Although valved micropumps have powerful performance, their popularized application is limited by high technical barriers and high costs brought by complex microstructures. Herein, we propose a multi-step PDMS curing method and a local PDMS separation strategy to achieve mass, standardized, and low-cost manufacturing of valved micropumps, solving their popularized problems by promoting role separation between manufacturers and users. The multi-step curing and the centralized structural layout enable a volume 20 times smaller than other valved micropumps. The lithography mold quality is the main reason for only 74% yield, and using metal molds would be a better alternative. Theoretical analysis shows that the thickness and diameter of the pump membrane are the main factors in designing different driving capabilities of the micropump. By driving the micropump through periodic fluid pressure, the results show that the flow rate is positively related to the input pressure and exhibits two flow rate formation mechanisms at high and low frequencies. Its powerful back pressure generating ability also indicates that the micropump has wide application prospects as injection pumps. The micropump also demonstrates tremendous flexibility and convenience in integration, driving, and application. The multi-step PDMS curing and controlled separating ideas show popularization value for other microfluidic components, such as one-way valves, hoping to innovate the microfluidics field.

Passive fractionating mechanism for oil spill using shear-wettability modulation.

Oil spillage and organic solvent leakage have been a frequent occurrence in recent years, which pose a significant threat not only to the aquatic ecosystems but also result in substantial economic burdens. This has necessitated the search for materials capable of separating oil from water at enhanced efficiency with superior mechanical and thermal properties. In this study, we conduct a set of systematic molecular dynamics simulations to investigate the potential of two-dimensional graphene-like channels under extreme confinement to achieve efficient oil-water separation. Effective modulation of the wetting characteristics of graphene-like surfaces juxtaposed with unconventional flow behavior at the nanoscale unveils differential interaction of water and oil molecules towards the wall, thereby resulting in distinct separation zones for varying compositions of the oil-water mixture. Such separation zones have been observed to be highly correlated with mixture temperature, which provides effective separation pathways across diverse environmental conditions. Our study offers a paradigm shift in oil-water separation strategies, which not only provides deeper insights into the equilibrium and dynamic behavior of a two-phase mixture but also holds immense implications for the development of smart, wettability-based oil separation devices.

An Improved Ambiguity Echo Separation Strategy for Multi-Channel SAR Based on Independent Component Analysis

An Improved Ambiguity Echo Separation Strategy for Multi-Channel SAR Based on Independent Component Analysis

Accounting Perspectives on Valuation of Intellectual Capital Versus Artificial Intelligence

In today’s developing economy, it is clear that technology and human knowledge are creating new opportunities. The issue is not whether we use Artificial Intelligence (AI) systems, but how we value the assets generated by AI, how it interacts with the firm’s Intellectual Capital (IC) and how we know which are the most important resources that increase productivity and add value. The efforts of accountants, academics, regulators, theorists and practitioners need to be directed towards resolving the uncertainties and issues related to the valuation and financial reporting of intangible assets generated by IA and IC. In this context, the exploration of the terms intellectual capital and artificial intelligence requires finding separate strategies for evolution, but with common principles. The most visible result is that there is an increased interest in artificial intelligence, but focused more on the technical, engineering parts, but not on the financial valuation of intangible assets. The academic community appreciates the advantages of technology to intellectual capital, but they draw attention to the need to recognize the intangibles that will create more and more species.

The dividing question as a hedging tool in the dialogues of the British working class

The subject of the study is the dividing issues-hedges in the speech of the British working class. The purpose of the work is to determine the features of their functioning as a means of speech fencing (hedging). The main communicative tasks for which representatives of the British working class resort to using the structure of the dividing question in order to hedge their statements are identified: expression of opinion, criticism, statement of fact, assumption, proposal, demand, request for information and intention. A number of patterns have also been identified when using ascending or descending nuclear tones in the second half of the dividing questions used as hedges. The material of the study is the dialogues of the characters, representatives of the modern London working class, of the movie "Sorry We Missed You" (2019, directed by K. Loach) in the original language. The work uses linguistic and contextual analysis in order to classify the research material. Audit and electroacoustic analysis of statements were also carried out using the Praat program. The novelty of the study lies in the choice of material and subject of the study: the film "Sorry We Missed You" has not been considered by linguists as a material for analyzing the rhythmic dynamics of English speech, and the features of hedging in communication of the British working class remain extremely poorly studied. The study showed that hedging, allowing communicants to maintain each other's personal boundaries, is not always a means of making a statement polite, as it is often used even in conflict situations. The emotional state of the addressee does not reduce the need to apply a speech separation strategy (including using the structure of the dividing question), but it affects its rhythmic and melodic design. Other important factors in choosing the intonation of hedges are the desire to continue or end the conversation, as well as the gender of the speaker.

Selective separation of rare earth, Sr, Mo, and Zr from simulated raffinate of uranium/plutonium co-purification process

Spent fuel contains many elements including those that are radioactive. Separation and recovery of these substances have been challenging. This paper presents an efficient strategy for stepwise separation of the rare earth, strontium, molybdenum, and zirconium from the simulated raffinate of a uranium/plutonium co-purification process. This strategy employed three extractants with different metal ion selectivity, and cyclohexanediamine tetraacetic acid (CDTA) was introduced as a complexing agent to inhibit the extraction of Zr(IV) and precious metals. The recovery efficiency of all the rare earth elements was more than 97 % through the three-stage extraction, with N,N,N′,N′-tetranoctyl-diglycolamide (TODGA) as the extractant and N,N-dibutyloctanamide (DBOA) as the phase modifiers. Sr(II) was selectively recovered using N,N,N′,N′-tetracyclohexyl-diglycolamide (TCHDGA). A bisphosphonic acid extractant, N,N-hexadecylamine bis (methylene phenylphosphonic acid) (HADMPPA), was designed and synthesized for the selective separation of Zr(IV) and Mo(VI). The separation conditions of the recovered elements from other elements in each step were systematically examined. Moreover, the mechanism of the extraction reaction was investigated using FTIR spectroscopy, the slope method, and the equimolar series method. To our knowledge, this is the first time that four groups of major elements have been sequencially separated from the simulated high-level waste liquid in one process. This work could contribute to nuclear fuel reprocessing as well as the sustainable development of nuclear energy.

Effectiveness of Chicken Manure Flower Extract (Tagetes ercta L.) Against Mortality and Antifeedant in Chili Aphid Pests Myzus persicae sulz

This research was motivated by the chicken dung flower plant (Tagetes erecta L.) which is one of the plants that is often found in several areas in North Sulawesi, containing active chemical compounds such as alkaloids, terpenoids, saponins, tannins and flavonoids which can improve health. improve health. improve health. improve health. improve health. improve health. used as a vegetable protector. This study aims to determine the effectiveness of chicken manure flower extract on the mortality and antifeedant effect of chili aphids Myzus persicae sulz. This examination utilized an exploratory technique utilizing the leaf separate strategy utilizing a Totally Randomized Plan (CRD) design comprising of 4 treatments and 4 replications. Each treatment was given chicken manure flower extract with respective concentrations, namely P0 (0%), P1 (5%), P2 (10%), and P3 (15%). The results showed that the administration of chicken manure flower extract had a significant effect on the death of the chili aphid Myzus persicae sulz. The higher the extract from chicken manure flowers the higher the death rate of chili aphids Myzus persicae sulz and chicken manure flowers have an antifeedant effect at a concentration of 15%. So it can be concluded that giving chicken manure flower extract is effective in increasing the mortality of Myzus persicae sulz at a concentration of 15%, namely an average of 4.75 birds and has an antifeedant effect at a concentration of 15.%, namely an average of 0.350 grams.

ПРАВОВЫЕ ОСОБЕННОСТИ ИСПОЛЬЗОВАНИЯ ИСКУССТВЕННОГО ИНТЕЛЛЕКТА ДЛЯ ОБЕСПЕЧЕНИЯ КИБЕРБЕЗОПАСНОСТИ В МАЛАЙЗИИ И ИНДОНЕЗИИ

The article provides a comparative legal analysis of approaches to the regulation and use of artificial intelligence in the field of cybersecurity using the example of the countries of the Asia-Pacific region – Malaysia and Indonesia. The main legal acts in the field of personal data protection, copyright, banking and financial sector, security of telecommunication networks, information infrastructure, cybercrimes, as well as issues of bringing to administrative and criminal liability for cybercrimes are considered. State bodies coordinating and implementing cybersecurity issues are listed. Particular attention was paid to the characteristics of the basic concepts disclosed in the acts under study. It is noted that the legal framework of Indonesia contains clearer interpretations of the definitions of a number of concepts in the field of cyber defense compared to Malaysia. However, Malaysian legislation covers a wider range of regulation of public life in the implementation of cybersecurity issues – from medicine to transport. In Indonesia, not all areas are so well regulated to deal with such issues. At the same time, the arsenal of means of protection against cyber-attacks or other illegal actions that encroach on the information and digital environment in Malaysia and Indonesia is approximately the same and differs only in the methods and quality (efficiency) of implementation. The serious and diverse approach of these countries for the further development, changes and improvement of legislation in matters of the use of artificial intelligence in activities to combat cybercrime is emphasized. Despite the contradictions on certain issues, each country seeks to strengthen its tools to combat cyber threats by developing separate national security strategies.

Quantitative real-time PCR and magnetic separation strategy for specific detection of group B streptococcus in perinatal Women's urine

IntroductionGroup B streptococcus(GBS)often causes adverse outcomes such as urinary system infection, intrauterine infection, premature birth, and stillbirth in perinatal women. Perinatal screening of GBS is conducive to guiding clinical scientific intervention and improving delivery outcomes.This study quantitative real-time PCR (RT-qPCR) combined with magnetic separation was used for GBS detection. Materials and methodsSample pre-treatment in this study involved the utilization of magnetic separation (MS) technology, aiming to expedite the detection process and enhance detection sensitivity, and the cfb gene of group B streptococcus was used as the target gene to establish quantitative real-time PCR (RT-qPCR) to detect group B streptococcus. ResultsIt was found that penicillin-functionalized magnetic beads had a good ability to enrich and capture group B Streptococcus.The findings revealed an exceptional detection sensitivity, with the ability to detect B streptococcus in urine samples at levels as low as 102 CFU/mL. ConclusionsThe utilization of MS technology in conjunction with the RT-qPCR (MS-RT-qPCR) assay, as demonstrated in this study, offers a viable approach for prenatal screening of group B streptococcus among perinatal women.