Field Of Control Research Articles

Comprehensive analysis on three-phase imbalance management technology of low-voltage distribution network

Energy production and use is one of the major sources of global greenhouse gas emissions. To combat climate change, many countries and organizations are pushing to reduce the use of fossil fuels, and the use of renewable energy sources such as solar, wind, and hydro is growing rapidly. The conversion of these renewable energy into electricity requires a large amount of power electronics. Power electronics have higher energy conversion efficiency, greater adjustability and control, and smaller size and weight than traditional generators. These characteristics make power electronic equipment have a wide range of application prospects in the field of energy conversion and power control. There may be cost, reliability, debugging, and three-phase imbalance issues. Based on the harm of three-phase imbalance to the economic operation and safe and stable operation of distribution network, the importance of three-phase imbalance in low-voltage distribution network is expounded, and the relationship between three-phase unbalance current and power factor is elaborated on the construction of three-phase imbalance. Reduce the harm of three-phase imbalance to the distribution network and reduce the loss of distribution network lines.

Extraction, characterization, and utilization of mung bean starch as an edible coating material for papaya fruit shelf‐life enhancement

AbstractThis research was aimed to investigate the utilization of mung bean starch as an innovative edible coating material to enhance the shelf‐life of cut papaya fruits. The study focused on the extraction process of mung bean starch and its subsequent characterization through various analyses. Particle size (142.3 ± 1.24 nm), zeta potential (−25.52 ± 1.02 mV), morphological images, Fourier transform infrared (FTIR) spectra, and thermal stability (68.36 ± 0.15°C) were assessed to determine the mung bean starch properties. The functional properties, such as bulk density (0.51 ± 0.004 g/cm3) and tapped density (0.62 ± 0.010 g/cm3), angle of repose (21.61°), swelling power (12.26 ± 0.25%), and minimum gelation concentration (4.01 ± 1.25%), were examined to detect its potential as a coating base material. Subsequently, the prepared mung bean starch coating solution (1%, 2%, 3%, 4%, and 5%) was applied to papaya fruits and the coated fruits' physicochemical characteristics evaluated during storage. These characteristics encompassed color, weight loss, pH shifts, total soluble solids, titratable acidity, vitamin C content, fruit firmness, microbial analysis, and sensory attributes. The results revealed that starch coating on papaya maintained its color, reduced weight loss, preserved vitamin C, and delayed firmness loss, enhancing shelf‐life when compared to control sample. These findings demonstrated the effectiveness of mung bean starch coatings in preserving papaya fruits. The research made a significant contribution to the use of mung bean starch as a potential coating material for improving the shelf‐life of papaya fruits. This finding has great promise for the field of food preservation and quality control.

Development of standard operating procedure "Quality control of sodium chloride solution 0.9% (350 ml) for infusion (intra-pharmacy preparation) in pharmacy organizations manufacturing pharmaceuticals"

To develop a standard operating procedure (SOP) for quality control of 0.9% sodium chloride solution (350 ml) for infusion (intra-pharmacy preparation) in accordance with the requirements of the current regulatory documentation. Materials and Methods. Sodium chloride 0.9% sodium chloride solution (350 ml) for infusion (intra-pharmacy preparation) served as the object of the study. The SOP was developed taking into account the requirements of updated regulatory documents used in the field of quality control of medicines: Federal Law No. 61 dated 12.04.2010 "On Circulation of Medicines", Order of the Ministry of Health of the Russian Federation dated 22.05.2023 No. 249n, Order of the Ministry of Health of the Russian Federation dated 22.05.2023 No. 647n dated 31.08.2016, State Pharmacopoeia XV ed. and GOST R 52249-2009. Results. The main stages of the SOP in accordance with the current regulatory documentation are given, reagents, instruments and equipment required for testing are listed, mandatory and sample types of control are indicated. For this dosage form the mandatory controls will be organoleptic, written, control at release, physical and full chemical control. The methods of pH and authenticity tests are described, and the chemistry of qualitative reactions is given. For quantitative determination by the method of argentometry according to Mohr, the method of analysis is given, chemical reactions occurring during titration, the necessary calculations are made: the titer of silver nitrate solution of sodium chloride, the preliminary volume of titrant, the content of sodium chloride in the dosage form in grams. Permissible content limits are given in accordance with OFS.1.8.0001 "Medicinal preparations of pharmacy manufacture". Based on the results of the SOP development, a working instruction for quality control of sodium chloride solution 0.9% (350 ml) for infusion was drawn up. Conclusion. The presented SOP for quality control of sodium chloride solution 0.9% (350 ml) for infusion (intra-pharmacy preparation) describes the requirements for the organization and conditions of testing in assessing the quality of this dosage form and can be implemented in the work of manufacturing pharmacies as a detailed instruction for intra-pharmacy control.

Organization and Implementation of Public Tax Control in Russia: Modern Problems and Ways to Solve Them

Annotation. This scientific research addresses the issues of the functioning and development of public tax control, which is the most important component in the system of guarantees of both the system of constitutional principles (especially democracy and the participation of Russian citizens in the functioning of the public administration system), and the system of rights, freedoms, legitimate interests of individuals and legal entities in Russia. The necessity of incorporating the institution of public tax control into the Russian legal system is substantiated. The article examines various approaches to defining the concept of public tax control and substantiates its author's definition. The work analyzes modern problems that hinder the development of public tax control in Russia, including: the lack of enshrinement of this institution of civil society in the Constitution; not developing specific forms, methods and types of public tax control measures in the Russian scientific legal doctrine; the lack of real powers among subjects of public control to exercise effective public tax control; lack of specialized subjects of public control in this area; poor use of modern information and communication technologies by these entities in their activities; insufficient funding for their activities from state and municipal budgets; weak use of foreign positive experience in organizing and functioning of control of civil society in this area; the absence of specific measures of responsibility for counteracting the legitimate activities of representatives of subjects of public control in criminal and administrative legislation. The article develops and substantiates a system of measures to resolve these problems by: incorporating public tax control into the Constitution of Russia; its details in Russian legislation; expanding the powers of subjects of public control; creation of special entities in the field of public tax control, independent of tax authorities; using in their activities positive foreign experience in exercising public control in the field of tax legal relations; developing a system of federal programs to develop the organizational, technical and financial base of subjects of public control, increasing their use of modern digital technologies; tightening measures of criminal and administrative liability for opposing the legitimate activities of subjects of public tax control.

On the Need to Develop a Federal Program to Optimize the Economic Base of Public Control in Russia

Annotation. This article is devoted to the analysis of the prospects for the development and adoption of a federal program aimed at optimizing the economic basis of public control in the Russian Federation. The authors substantiate the position that one of the main problems hindering the development of public control in the country is its weak economic base. Due to the fact that public authorities play an important role in the process of formation and functioning of subjects of public control in Russia, the basis for financing the organization and activities of public control are funds from state and municipal budgets. In this regard, the authors substantiate the need for the development and adoption by the Government of the Russian Federation of a comprehensive federal program dedicated to strengthening organizational, technological, material and property independence and independence of subjects of public control. The work substantiates the need to include in the draft of the above-mentioned federal program sections devoted to: ensuring the material and technical independence of subjects of public control from public authorities; ensuring their financing primarily from protected items of public budgets; development of processes for the use of modern information and communication technologies by these entities; consolidation of a system of criteria for assessing the effectiveness and efficiency of the work of subjects of public control as the main condition for increasing the volume of their funding; consolidating a system of control on the part of public authorities regarding budget financing of the activities of these entities; systems for organizing public-private partnerships in the field of public control. In addition, the work substantiates the system of proposals for participation in the development of the above-mentioned federal program of the country's Public Chamber.

Adaptive neural network iterative learning control of long-stroke hybrid robots with initial errors and full state constraints

Research on initial errors and constraint restrictions is one of the main research directions in the field of control of uncertain robotic systems. An adaptive iterative learning control (AILC) method based on radial basis function (RBF) neural network is proposed to address the trajectory tracking problem of the long-stroke hybrid robot system with random initial errors and full state constraints. The RBF neural network is used to approximate the unknown nonlinear terms, and the network weights are updated using an iterative learning law that incorporates a projection mechanism. Additionally, a robust learning strategy is used to compensate for both the approximation error of the neural network and the external disturbances that vary with each iteration. To relax the requirement of traditional iterative learning control (ILC) for identical initial condition, an equivalent error function is constructed based on the time-varying boundary layer. The tangent-type barrier Lyapunov function (BLF) is designed to ensure that the joint position and speed of the robot system are bounded within a predetermined range. Through stability analysis based on barrier composite energy function (BCEF), it can be proved that the boundedness of all signals in the closed-loop system and the tracking error of the robot system will converge to an adjustable residual set asymptotically. Finally, through simulation experiments conducted on the MATLAB platform, the results demonstrate that the method overcomes the random initial errors of the system effectively, ensures that the system satisfies the full-state constraints, and realizes high-precision trajectory tracking.

Optimizing control fields for diabatic protocols in the presence of noise

Optimizing control fields for diabatic protocols in the presence of noise

Permission for concentration of business entities as a component of the state competition policy

The article examines aspects of current Ukrainian legislation, including regulations of the Antimonopoly Committee of Ukraine on concentration of business entities. The author analyses and compares them, and as a result reveals the legal mechanisms of state control over concentration processes of business entities, which consist in granting permission or prohibition of concentration by the controlling authority. The cases in which concentration is subject to a thorough examination by the supervisory authority and can be carried out only with its consent, as well as cases in which such consent is not required, are considered. The article describes the procedure for business entities to apply to the Antimonopoly Committee of Ukraine with an application for a merger clearance, and also highlights the requirements that must be met by the applicant in such an application for its consideration by the supervisory authority. The article outlines the process of consideration of cases by the Antimonopoly Committee of Ukraine on granting permits to business entities for economic concentration. The rights and obligations of applicants, third parties, interested parties and the supervisory authority during the consideration of cases are described. The list of decisions made by the committee based on the results of consideration of applications, as well as the grounds for their adoption, is considered. The author clarifies the main principles of appealing against such decisions in court or by appealing to the Cabinet of Ministers of Ukraine. The author examines the criteria and types of liability for conducting concentration without obtaining a permit, as well as for providing false information to the controlling authority in the process of obtaining a permit for concentration actions. The article examines the positive and negative factors of the State’s competition policy and legal support for control over concentration processes. The author identifies specific aspects that may have a positive impact on the effective reform of Ukrainian competition law and, as a result, ensure that Ukraine pursues an effective competition policy in the field of control over economic concentrations, which will lead to the prosperity of competition as a driving force for economic and social progress.

Multiparameter critical quantum metrology with impurity probes

Quantum systems can be used as probes in the context of metrology for enhanced parameter estimation. In particular, the delicacy of critical systems to perturbations can make them ideal sensors. Arguably the simplest realistic probe system is a spin- 12 impurity, which can be manipulated and measured in-situ when embedded in a fermionic environment. Although entanglement between a single impurity probe and its environment produces nontrivial many-body effects, criticality cannot be leveraged for sensing. Here we introduce instead the two-impurity Kondo model as a novel paradigm for critical quantum metrology, and examine the multiparameter estimation scenario at finite temperature. We explore the full metrological phase diagram numerically and obtain exact analytic results near criticality. Enhanced sensitivity to the inter-impurity coupling driving a second-order phase transition is evidenced by diverging quantum Fisher information (QFI) and quantum signal-to-noise ratio (QSNR). However, with uncertainty in both coupling strength and temperature, the multiparameter QFI matrix becomes singular—even though the parameters to be estimated are independent—resulting in vanishing QSNRs. We demonstrate that by applying a known control field, the singularity can be removed and measurement sensitivity restored. For general systems, we show that the degradation in the QSNR due to uncertainties in another parameter is controlled by the degree of correlation between the unknown parameters.

An Image-Based Interactive Training Method of an Upper Limb Rehabilitation Robot

Aimed at the problem of human–machine interaction between patients and robots in the process of using rehabilitation robots for rehabilitation training, this paper proposes a human–machine interactive control method based on an independently developed upper limb rehabilitation robot. In this method, the camera is used as a sensor, the human skeleton model is used to analyse the moving image, and the key points of the human body are extracted. Then, the three-dimensional coordinates of the key points of the human arm are extracted by depth estimation and spatial geometry, and then the real-time motion data are obtained, and the control instructions of the robot are generated from it to realise the real-time interactive control of the robot. This method can not only improve the adaptability of the system to individual patient differences, but also improve the robustness of the system, which is less affected by environmental changes. The experimental results show that this method can realise real-time control of the rehabilitation robot, and that the robot assists the patient to complete the action with high accuracy. The results show that this control method is effective and can be applied to the fields of robot control and robot-assisted rehabilitation training.

Establishment of RNAi-Mediated Pest Control Method for Red Imported Fire Ant, Solenopsis invicta.

RNAi plays a crucial role in insect gene function research and pest control field. Nonetheless, the variable efficiency of RNAi across diverse insects and off-target effects also limited its further application. In this study, we cloned six essential housekeeping genes from Solenopsis invicta and conducted RNAi experiments by orally administering dsRNA. Then, we found that mixing with liposomes significantly enhanced the RNAi efficiency by targeting for SiV-ATPaseE. Additionally, we observed a certain lethal effect of this dsRNA on queens by our established RNAi system. Furthermore, no strict sequence-related off-target effects were detected. Finally, the RNAi effect of large-scale bacteria expressing dsRNA was successfully confirmed for controlling S. invicta. In summary, this study established an RNAi system for S. invicta and provided a research template for the future development of nucleic acid drugs based on RNAi.

Hot spots and trends in microbial disease research on cultural heritage: a bibliometric analysis.

This study is to understand and analyze the development history, research hotspots, and research trends in the study of microbial diseases of cultural heritage through bibliometric analyses in order to fill the current gap of no literature review in this research field and to make certain contributions to the research in this field and the protection of cultural heritage. Bibliometric and visual analyses of the literature on cultural heritage microbial diseases in the Web of Science (WoS) core collection were carried out using VOSviewer and R-bibliometrix, choosing the two main literature types of papers and reviews. The emphasis was placed on analyzing and summarizing core research strengths, hotspots, and trends. Six hundred sixty-seven documents (573 articles and 94 reviews) were retrieved. αIn the WoS core collection, the first literature on cultural heritage microbial disease research was published in January 2000, and the annual number of publications from 2000 to 2009 did not exceed one; the annual number of publications from 2010 onwards increased rapidly, and after 2018, the number of publications per year exceeded 60, reaching 94 in 2020, which indicates that cultural heritage microbial disease research is booming. Our research showed that Italy, the USA, and China were the leading research countries, and Univ Milan was the institution with the most publications. International Biodeterioration &Biodegradation was the most published and co-cited journal, and Gu JD was the most prolific author. The research hotspots in the study of microbial diseases of cultural heritage mainly include biological degradation of cultural heritage; identification of diseased microorganisms and disease mechanisms; cultural heritage microbial disease prevention and control methods; monitoring, prevention, and control of diseased microorganisms in indoor air; antibacterial agents, especially essential oils, nanoparticles, and other safe and efficient antibacterial products research and development; and exploration of the mechanisms of biofilm protection of cultural heritage on cultural heritage surfaces. Monitoring and identifying cultural heritage microbial communities, identifying disease mechanisms, and researching safe and efficient bacteriostatic products such as essential oils and nanoparticles will be the main research directions in the field of cultural heritage microbial disease prevention and control in the future.

Vaccines for all stages

There are many vaccines to select from when developing proto­cols for beef cattle operations, and no single vaccine protocol is appropriate for all operations. Thus, vaccine protocol develop­ment requires understanding of the management of each op­eration. Unfortunately, current field trials confirming efficacy of vaccines to prevent disease in “real life” settings are not com­mon, and not all protocols have been tested. Thus, development of protocols for farm or ranch use often relies on experimental challenge studies or expert opinion. When vaccination of calves in the first 3 to 4 months of life is possible, vaccines for clostrid­ial infections and respiratory viral infections are most likely to be used to limit preweaning disease. On some operations, pre­weaning vaccination may be delayed until close to weaning if the aim is to limit postweaning disease. Vaccines likely appro­priate to limit postweaning disease include those for clostridial agents, agents that cause bovine respiratory disease, and agents likely to impact fertility in replacement heifers. Other vaccines may be appropriate on a case-by-case basis. Health records in­cluding vaccine timing and occurrence of disease in vaccinated animals can be a major help to confirm efficacy of vaccine pro­tocols. Veterinarians should periodically check for new sys­tematic reviews, meta-analyses, or randomized controlled field trials testing vaccines they used, to have the best information to use when planning vaccination protocols.

Speed Control of Switched Reluctance Motor using Adaptive Fuzzy Backstepping Sliding Mode Control

Speed Control of Switched Reluctance Motor using Adaptive Fuzzy Backstepping Sliding Mode Control

Optically controlled variable damping system based on PLZT ceramic/ERF in rectangular microchannel

Variable damping control technology based on intelligent materials of electromagnetic excitation has been widely used in the field of (semi-) active vibration control and fluid control. Unfortunately, a major drawback is the electromagnetic noise interference and low response speed. In this paper, a new optically controlled variable damping system based on PLZT ceramic/electrorheological fluid (ERF) is proposed. The mathematical models of the photovoltage generated by PLZT ceramics and the pressure difference between the two ends of the microchannel are established and verified by numerical simulation in COMSOL Multiphysics. Meanwhile, with the increase of light intensity, liquid flow rate and decrease of microchannel height and width, the pressure difference shows an uptrend. Optically controlled variable damping system based on PLZT ceramic/ERF is a control method with the advantages of a clean excitation source, remote control, no electromagnetic interference, and fast response speed, and has a good application prospect in the field of vibration control and fluid control.

Model Virtues in Computational Cognitive Neuroscience.

There is an abundance of computational models in cognitive neuroscience. A framework for what is desirable in a model, what justifies the introduction of a new one, or what makes one better than another is lacking, however. In this article, we examine key qualities ("virtues") that are desirable in computational models, and how these are interrelated. To keep the scope of the article manageable, we focus on the field of cognitive control, where we identified six "model virtues": empirical accuracy, empirical scope, functional analysis, causal detail, biological plausibility, and psychological plausibility. We first illustrate their use in published work on Stroop modeling and then discuss what expert modelers in the field of cognitive control said about them in a series of qualitative interviews. We found that virtues are interrelated and that their value depends on the modeler's goals, in ways that are not typically acknowledged in the literature. We recommend that researchers make the reasons for their modeling choices more explicit in published work. Our work is meant as a first step. Although our focus here is on cognitive control, we hope that our findings will spark discussion of virtues in other fields as well.

Controllable concentric electric field line distribution for simultaneous separation of DNA

An approach for the controllable separation and concentration of nucleic acid using a circular nonuniform electric field was proposed and developed. Using six different lengths of DNA molecules as standard samples, the distribution of the gradient electric field was increased from the outer circular electrode to the inner rod-shaped electrode, contributing to the migration of DNA molecules at a velocity gradient towards the region with the strongest inner electric field. The DNA molecules were arranged in a distribution of concentric circles that aligned with the distribution of concentric equipotential lines. The concentration of DNA multiplied with the alternation of radius. As a result, this platform allowed simultaneous DNA separation, achieving a resolution range of 1.17–3.03 through an extended electrophoresis time, resulting in enhanced concentration factors of 1.08–6.27. Moreover, the manipulation of the relative height of the inner and outer electrodes enabled precise control over the distribution and the deflection degree of electric field lines, leading to accurate control over DNA deflection.

Experimental study and multi‐scale refinement model of high damping acrylic polymer matrix VEDs for civil structural seismic retrofit

AbstractThe viscoelastic dampers (VEDs), which can provide both stiffness and damping, have been recently introduced into the field of structural vibration control for seismic enhancement of civil engineering structures. In this study, a kind of high damping acrylic polymer matrix VEDs (HDPVED) is developed independently, and this innovative HDPVED can solve the significant problem of service performance under medium‐high temperature environments, as well as low‐frequency vibration control under earthquake actions for civil engineering structures. To systematically investigate the influencing rules of frequency, temperature, and displacement amplitude on the mechanical properties and damping dissipation performance of HDPVEDs, a series of dynamic mechanical performance tests of the developed HDPVEDs are carried out at different frequencies, temperatures, and displacement amplitudes. The research results show that HDPVED exhibits excellent damping dissipation capability and adaptability under medium‐high temperature environments and low‐frequency excitations. The mechanical properties and energy dissipation performance present a strong correlation with frequency, temperature and displacement amplitude, and there is an obvious coupling effect between the three influencing factors. Based on the macroscopic mechanical property research of HDPVED, the microscopic damping mechanism and microscopic mechanical properties of HDPVED are then investigated. High‐order fractional derivative fraction Voigt and Maxwell model in parallel (FVMP) models are preferred to characterize the combined hyper‐elasticity and viscoelasticity owned by networked molecular chains and free molecular chains. The breaking and reconstruction theory of microphysical bonds is used to assess the effect of packing particles, and the time‐temperature equivalence principle is introduced to assess the effect of temperature. The multi‐scale refinement model is proposed, and the validity and accuracy of this model are verified by testing data of HDPVED. The study results show that the proposed model can accurately describe the effects of frequency, temperature, displacement amplitude, and microstructure on the multi‐scale mechanical properties of HDPVED. It provides a theoretical basis for the multi‐scale design and development of high damping VEDs.

Switching of magnetization in quantum antiferromagnets with time-dependent control fields

Switching of magnetization in quantum antiferromagnets with time-dependent control fields

The Effectiveness of Mixed Food Attractant for Managing Helicoverpa armigera (Hübner) and Agrotis ipsilon (Hufnagel) in Peanut Fields

Peanut is one of the widely cultivated oil-bearing and nut crops worldwide, so its stable production is crucial for oil supply and nuts, as well as socioeconomic development. Noctuid pests, such as Helicoverpa armigera (Hübner) and Agrotis ipsilon (Hufnagel), are the major pests in peanut. With growing resistance to chemical pesticides, there is an urgent need for advanced biocontrol solutions for peanut productions. We evaluated the control effect of Bioattract®, combined with the insecticide Coragen, a ‘mixed food attractant’, on noctuid pests through large-scale applications in four main peanut-producing provinces, Henan, Hebei, Shandong and Liaoning, of China from 2019 to 2023 in succession. The main types of insects attracted and killed by the mixed food attractant were noctuid pests, of which H. armigera, A. ipsilon and other pests were 84.2%, 10.4% and 5.4%, respectively. The female/male ratio of H. armigera was 1.04. In the mixed food attractant treatment fields, the average adjusted decrease rates of H. armigera were 68.74% ± 1.43% for the eggs and 66.84% ± 1.59% for the larvae; meanwhile, those of A. ipsilon were 59.24% ± 1.56% for the eggs and 51.06% ± 1.89% for the larvae. In addition, the damage rate of the new leaves of the peanut plants in the mixed food attractant treatment fields was significantly lower than that in the control fields, with an adjusted declined rate of 78.26% ± 0.80%. Compared with using conventional chemicals, applying biological food attractants could reduce costs by USD 43.85 ± 1.14 per hectare. These findings provide a basis for the large-scale promotion and application of Bioattract® for peanut pest management.