Principle Of Induction Research Articles

Design and Multi-Objective Optimization of a Composite Cage Rotor Bearingless Induction Motor

To improve the quality of starting torque and suspension force, a composite cage rotor bearingless induction motor (CCR-BIM) is designed, which adopts a composite cage rotor structure that combines an inner rotor and an outer rotor. First, the overall structure of the CCR-BIM is designed, the composite cage rotor of the CCR-BIM is specially designed and analyzed for the induction principle, and the mathematical model of suspension force and torque is deduced. Second, the initial structural parameters are determined, and motor qualities, such as starting torque quality and suspension force quality, are compared and analyzed between the proposed motor and BIM using a finite element model (FEM). Third, based on the response surface model (RSM), a multi-objective improved NSGA-II is constructed, and the three optimization objectives of starting torque, suspension force, and suspension force pulsation are optimized. Finally, the results of the experimental setup prove that the starting torque increases by 6.98%, the suspension force increases by 5.45%, and the suspension force pulsation decreases by 18.54%. The effectiveness of the proposed motor and the correctness of the multi-objective optimization strategy are verified.

A Velocity Measurement Method Based on Charge Induction.

In this paper, based on the principle of charge induction, a new velocity measurement method is proposed. A moving target generates a low-frequency electric field, which can be induced with an electrode and detection frontend. Velocity measurements are achieved by placing two electrodes at a fixed distance to detect the characteristic times. Firstly, the electric field generated by the moving target is modeled, and the theoretical output of the detection frontend is obtained via a simulation of the target passing by a single electrode. Then, according to the theoretical output, the velocity measurement simulation results of double electrodes are given for various driving conditions, such as a single vehicle driving in a single lane, a single vehicle changing lanes, two vehicles driving close together, and a multiple-vehicle situation. Finally, the above driving conditions are experimentally verified in sunny weather, windy and rainy weather, and a night environment.

Variable inductive shape memory spring based multifunctional module for high sensitivity measurements

Shape memory elements as sensing units have promising potential; the prospect of using shape memory alloy coil as a multi-functional module using the inductive principle is assessed in this work. The self-sensing phenomenon in SMA is dominantly explored from the change in electrical resistance, however, the same can be realized from the variation in inductance in its coiled form. This article introduces a unique, variable inductive sensing system using an SMA spring for high sensitivity measurements, performance of which greatly relies on its coil geometry and permeability. The configuration enables the sensing operation at an isothermal condition for testing force, displacement, and as a proximity sensor. Experimental verification of the proof-of-concept for sensitivity enhancement reveals that adding an iron core results in a sensitivity of 0.1 μH/0.1 N and 0.16 μH/mm, for force and displacement sensing respectively which is a twofold increase over the system's sensitivity with an air core.

THE ROBOTIC FEED DISTRIBUTORS’ POSITIONING SYSTEMS FOR CATTLE FARMS’ ANIMALS SERVICING

According to foreign scientists, a few years ago, the market’s basis was occupied by robotic feed dispensers’ suspended models, that are easy operating, but suspended tracks’ installation is required. Currently, there is a global trend the wheeled robots using. The purpose of this study is implementation systems’ modern approaches that the robotic feed dispensers autonomous on cattle farms ensuring to analyze. The suspended robotic feed dispenser DeLaval RA 135, that at its working by the of special metal elements position is guided, which are fixed on the suspended path and read by an inductive sensor operation principle is considered. Wheeled robots that move along suspended tracks setting the movement direction and supply electricity serving are presented. The Lely Vector wheeled robot’s description, which is equipped with inductive and ultrasonic sensors, a gyroscope, a laser rangefinder, encoders, impact sensors is given. It is established that the wheeled robots’ most technically complex and expensive models satellite navigation systems, camerabased vision systems, lidars can use. At such implementing system’s positioning, appropriate component base’s composition selection must be carried out on the basis of the robotic feed dispenser’s operating conditions, automatic feeding system composition, its functional features etc. For a robot moving within livestock premises, it is sufficient an ultrasonic sensor and/or a combination of an inductive sensor and metal plates using.

Efficacy and Safety of Autologous Serum Therapy in Chronic Spontaneous Urticaria in the Pediatric Population: A Prospective Pilot Study.

Chronic spontaneous urticaria (CSU) in children is mostly spontaneous in onset (57%). Treatment comprises long-term antihistaminic therapy without need for elaborate investigations. A subset of such patients don't respond to conventional treatment and novel therapies to help reduce pill burden is the need of the hour. To determine the efficacy and safety of autologous serum therapy (AST) in pediatric patients with chronic spontaneous urticaria. All pediatric patients, aged between 6-16 years, attended to our OPD from March 2019 to March 2020 were recruited. Clinico-demographic data and baseline investigations of all patients were performed. Two-weekly AST therapy was given for 8 visits with levocetrizine tablet 5mg on an on-demand basis. Urticaria activity score (UAS) sheet was provided to record and return every 2 weeks. Statistical analysis was done using the IBM SPSS 26 software package. Autologous serum skin test (ASST) was positive in 63% patients. Both the ASST positive and ASST negative group showed significant reduction in UAS7 score at week 14 compared to baseline. The reduction in mean UAS7 score was associated with a decreased pill burden and positive response in the patient and physician global assessment scale. No statistically significant difference between the two groups in terms of mean UAS7 reduction was found. This study has explored the efficacy and safety of autologous serum therapy in the pediatric CSU patients. Both ASST positive and ASST negative group respond to AST therapy.

THE EMERGING ROLE OF REPETITIVE TRANSCRANIAL MAGNETIC STIMULATION IN TREATING THE MENTAL CONDITION

repetitive Transcranial Magnetic Stimulation (rTMS) is a form of brain stimulation therapy which is approved by FDA (USA) and CE (Europe). In rTMS treatment, an instrument called a stimulator supplies electrical energy to a magnetic coil that generates a magnetic field in the brain for a short period of time. rTMS is based on the principle of electromagnetic induction that can either stimulate or inhibit the neuronal activity of specific brain areas as per need. This drug free treatment is helpful in many neurological and psychological disorders such as depression, OCD, migraines, autism, ADHD, epilepsy, Bipolar and sexual disorders. The treatment is so safe that it could be conducted on one year old child to an old age. It is an outpatient procedure which does not require hospitalization or anesthesia and entails no memory loss. After the session, patients require no recovery period and are able to go about their daily activities immediately following treatment. Other than some precautions, it is often ideal for patients, because it has none of the side effects of traditional medications and other treatments. It can be said rtms is a focal, non-invasive and very well-tolerated form of brain stimulation in clinical use which is safe for almost all patients suffering from mental or psychological disturbance.

Cs(Pb,Mn)Br3 Quantum Dots Glasses with Superior Thermal Stability for Contactless Electroluminescence Green-Emitting LEDs.

CsPbX3 (X = Cl, Br or I) perovskite quantum dots (PQDs) have gained increasing interest due to their superior performance in photoelectric applications. In our work, a series of Mn2+ doped CsPbBr3 PQDs were successfully prepared in glasses by melt quenching and in situ crystallization technique. Due to the 4T1 (4G)→6A1 (6S) transition of Mn2+, a slight red shift from 510 nm to 516 nm was found, with the FWHM expansion from 18 nm to 26 nm. The PQDs@glasses showed excellent thermal stability, and the exciton binding energy reached a high level of 412 meV. The changes of the electronic structure after Mn doping CsPbBr3 can be demonstrated by first principles. Finally, a contactless electroluminescence device with the PQDs@glasses was designed based on the principle of electromagnetic induction, which is a potential application for detecting distance in sterile and dust-free environments.

Spore-based innovative paper-strip biosensor for the rapid detection of ß-lactam group in milk

The study's goal was to develop a spore-based paper strip biosensor for detecting ß-lactam antibiotics in milk using the enzyme induction principle. A new spore-based paper strip biosensor has been developed after important operating parameters such as spore volume, substrate volume, exposure time and temperature, and incubation time and temperature were optimised. The limit of detection for various ß-lactam antibiotics, including amoxicillin, penicillin, ampicillin, carbenicillin, cloxacillin, nafcillin, oxacillin, cephalothin, cefalexin, cefoxitin, cefazolin, and cefuroxime, was determined in milk with detection sensitivity of 1 ppb, 2 ppb, 2 ppb, 10 ppb, 10 ppb, 10 ppb, 20 ppb, 10 ppb 1000 ppb, 10 ppb 300 ppb and 100 ppb, respectively. It was also tested with other contaminants such non-ß-lactam antibiotics, pesticides, aflatoxin, heavy metals, and other chemical contaminants, and no interference was found, indicating that the created biosensor had a low rate of false positive and negative results. In comparison to the AOAC-approved CHARM-ROSA ß-lactam strip test, which identified 7 raw milk and zero pasteurised milk samples positive for ß-lactam antibiotics, the sensor was further analysed and verified using 200 raw milk and 105 pasteurised milk samples. This indicates a perfect match between our biosensor and the AOAC-approved CHARM-ROSA ß-lactam strip test. The developed spore-based paper strip biosensors are expected to be useful in the rapid and cost-effective detection of ß-lactam antibiotic residues in milk samples at the dairy farm, reception dock, and production units, respectively.

An induction principle for the Bombieri-Vinogradov theorem over [formula omitted] and a variant of the Titchmarsh divisor problem

Let Fq[t] be the polynomial ring over the finite field Fq. For arithmetic functions ψ1,ψ2:Fq[t]→C, we establish that if a Bombieri-Vinogradov type equidistribution result holds for ψ1 and ψ2, then it also holds for their Dirichlet convolution ψ1⁎ψ2. As an application of this, we resolve a version of the Titchmarsh divisor problem in Fq[t]. More precisely, we obtain an asymptotic for the average behaviour of the divisor function over shifted products of two primes in Fq[t].

Determination of inductor parameters of induction charging device for contactless method of charging electric transport

THE PURPOSE. The lack of charging infrastructure is one of the main reasons for the refusal to use electric vehicles in Russia. The solution could be the development of mobile electric vehicle charge units (MCSEU). To implement a truly competitive product, it is necessary to take into account all possible types of electric vehicle charging, and not only standard ones, CHAdeMO, CCS, etc., but also wireless charging based on an induction charger (IC). Therefore, the purpose of this work is to model the two main types of IC implementation, compare the results obtained, and develop a physical modeling model for the selected scheme.MATERIALS. IC is based on the principle of magnetic induction, so the simulation was carried out for two options for implementing contactless charging, the frequency and value of the inductances of the coupled coils were calculated, and based on the results obtained, conclusions were drawn about the optimal distance at which the required efficiency value is maintained. For physical modeling of the process of non-contact charging of electric vehicles, a calibrator model has been developed, and ferrite plates have been calculated.RESULTS. Based on the simulation, a scheme for the implementation of the IC with adjustable capacitor capacitance was chosen, the topologies of antennas and the geometry of ferrite plates and a design documentation of a 6-axis calibrator for testing were developed. R&D was carried out at the Federal State Budgetary Educational Institution of Higher Education "KSPEU".CONCLUSION. The use of IC provides great opportunities for the development of mobile charging stations, as it increases the number of possible connections. However, efficiency and charging distance are critical for this equipment, therefore, already at the modeling stage, it is necessary to select the parameters of the coils as accurately as possible, and the circuit used. For the developed MCSEU, within the framework of Resolution 218, optimal solutions were identified in the field of modeling and testing of IC.

Hybrid spectrum conjugate gradient algorithm in electromagnetic tomography

Electromagnetic tomography is a process detection technology based upon the principles of electromagnetic induction. The forward problem model and sensitivity distribution matrix of electromagnetic tomography are introduced as the basis of the inverse problem. The search direction and iterative parameters of the conjugate gradient algorithm are modified to improve the quality and convergence of image reconstruction. A new spectral parameter conjugate gradient algorithm is described to modify the search direction, which is used to control the angle between the old and new search directions. The search direction is determined according to the iteration of each step in order to find the optimal solution. Combining the advantages of the Fletcher-Reeves and Polak-Ribiere-Polyak algorithms in the nonlinear conjugate gradient algorithm, they are mixed in a specific proportion to obtain a new hybrid conjugate gradient algorithm. In order to verify the effectiveness of the modified conjugate gradient algorithm, three physical models of electromagnetic tomography system are constructed, and the modified conjugate gradient algorithm is compared with the traditional algorithm. The experimental results show that the reconstructed image quality of the modified spectral conjugate gradient algorithm is higher and has better numerical performance. The hybrid conjugate gradient algorithm highlights the advantages of the Fletcher-Reeves and Polak-Ribiere-Polyaks algorithms. The convergence speed is faster than the Polak-Ribiere-Polyak method, and the imaging quality is higher than the other algorithms.

Unshielded portable optically pumped magnetometer for the remote detection of conductive objects using eddy current measurements.

Electrically conductive objects can be detected using the principle of electromagnetic induction, where a primary oscillating magnetic field induces eddy currents in the object, which in turn produce a secondary magnetic field that can be measured with a magnetometer. We have developed a portable radio-frequency optically pumped magnetometer (RF OPM) working in unshielded conditions with sub-pT/Hz magnetic field sensitivity when used for the detection of small oscillating magnetic fields, setting a new benchmark for the sensitivity of a portable RF OPM in unshielded conditions. Using this OPM, we have detected the induced magnetic field from aluminum disks with diameters as small as 1.5cm and with the disks being ∼25 cm from both the excitation coil and the magnetometer. When used for eddy current detection, our magnetometer achieves a sensitivity of a 2-6 pT/Hz. We have also detected a moving aluminum disk using our RF OPM and analyzed the magnetometer signals, which depend on the position of the disk, illustrating the potential of high sensitivity RF OPMs for remote sensing applications.

Study on AC interference law of high voltage AC cable to submarine pipeline and safe distance

AbstractIn recent years, due to the large‐scale construction of wind power and shore power projects, the amount of submarine high‐voltage AC cables has been increasing year by year, and they often form a “common corridor” in parallel with adjacent submarine pipelines, resulting in AC interference on pipelines. A lot of research has been carried out on the AC interference law of buried pipelines onshore. However, there is a lack of discussion on the AC interference suffered by submarine pipelines from high‐voltage AC cables. How to understand the AC interference law of high‐voltage AC cables to submarine pipelines and determining the safe distance has become an urgent demand in practical production. Based on this, this paper established a calculation model for AC interference suffered by submarine pipelines from high‐voltage AC cables on through CDGES software. Through simulation calculation, the influence laws of many factors such as parallel distance between AC cables and pipelines, parallel length, cable load current, anticorrosive coating resistivity, and longitudinal pipeline resistance per unit length on AC interference parameters of pipelines were investigated. It was found that the degree of AC interference increases with the increase of the anticorrosive coating resistivity, the load current, and the longitudinal pipeline resistance per unit length, as well as the decrease of the parallel interval. However, with the increase of the parallel length, the AC interference voltage and current density of the pipeline increase firstly, then decrease, and at the end remains unchanged, and it was found that there existed the parallel length with the maximum AC interference and the saturation parallel length with unchanged AC interference. Based on the principles of electromagnetic induction and AC circuits, the main reasons for the parallel length with maximum AC interference and the saturation parallel length were analyzed in this paper. The safe distances avoiding AC corrosion under different parallel lengths and load currents were discussed, which can provide a reference for the evaluation of AC interference of submarine pipelines and the selection of submarine routing.

Optimization and research of coil based on marine heavy oil electromagnetic heater

Based on the theory of electromagnetic field, the Marine heavy oil electromagnetic induction heater uses the principle of electromagnetic induction to realize the energy conversion and transfer, so as to heat the heavy oil to the inlet temperature to achieve the purpose of heating.By means of electromagnetic induction, eddy currents are generated on the tubing wall under the action of a magnetic field. The wall of the heated oil pipe conducts heat energy to the heavy oil in the pipe. In this heating mode, the coil is directly around the oil supply unit pipeline of the ship for heating, and the heating effect depends on the heating electromagnetic field.Therefore, to study the electromagnetic field and its influencing factors of heavy oil electromagnetic induction heating is the premise of designing heavy oil electromagnetic induction heater.In this paper, the magnetic induction intensity generated by the electromagnetic induction heater with different pitch is analyzed theoretically, and simulated and optimized by COMSOL Multiphysics software.

Making Sense of Normalization

Abstract This article examines current practices of normalization of names in Norse philology and computational linguistics that to a large extent build on deductive reasoning and external authoritative sources such as grammars, dictionaries and gazetteers. Instead, a survey of manuscript evidence and quantification of name forms at several levels of abstraction is proposed as an alternative inductive principle of normalization. A case study of name-form distributions in a dataset of 6,633 spatial attestations in East Norse literature from the Norse World resource serves as a point of departure for a discussion of the advantages and disadvantages of the approach. The comparison between attestations linked to the five most frequent place-names in Old Swedish and Old Danish shows the existence of typical spellings. However, there are still examples of norm negotiations and competitive distributions. Thus, the first inductive step of normalization can be complemented by further processing based on correspondences between phonology and spelling. Finally, stratified normalization of place-names pioneered by Norse World is seen as more versatile compared to traditional methods; the approach has a potential to facilitate both more nuanced philological and linguistic research as well as the further development of named-entity recognition tools.

Interim results of the PML-16, PML-19 protocols for primary mediastinal large B-cell lymphoma therapy

Introduction. Primary mediastinal lymphoma (PML) is an aggressive lymphoid tumor treatment success of which is determined by induction therapy. To date, none of the standard chemotherapy regimens (CT) have demonstrated an advantage in efficacy. Intensive therapy programs are associated with high toxicity.Aim — to evaluate the efficacy and toxicity of two pilot prospective treatment protocols PML-16 and PML-19 as well as the possibility of using the analysis of freely circulating tumor DNA (ctDNA) to assess MRD in patients with PML.Materials and methods. From January 2016 to January 2022, 34 previously untreated PML patients were included in the study; average age — 32; stage > I — in 60 %; extramediastinal lesions — in 14.7 %; bulky disease — in 73.5 % of patients. Positron emission tomography combined with computed tomography (PET-CT) was performed; ctDNA was determined to assess the completeness of remission.Results. Eighteen patients received treatment according to the PML-16 protocol (6 courses of chemotherapy; 2 blocks of RmNHL-BFM-90 + 4 courses of R-EPOCH). After the end of therapy, all 18 patients achieved PET-negative remission. The next 16 patients received treatment according to the PML-19 protocol (4 courses of chemotherapy; 2 blocks of R-mNHL-BFM-90 + 2 courses of R-EPOCH) in combination with lenalidomide. After the end of therapy, 9 (56 %) patients achieved PET-negative remission; 7 (44 %) retained pathological activity (D4–5 points). After 3 and 6 months 15 (94 %) patients achieved normalization of metabolic activity. Considering the high frequency of false-positive results in patients with PML, a ctDNA study was performed to determine the depth of remission in 15 patients. After the end of therapy, all 15 patients had complete elimination of ctDNA. Of these, 5 (33 %) remained PET-positive at the end of treatment. During further observation, after 3–6 months, in 4 patients the level of metabolic activity decreased to physiological without the use of consolidating therapy. After the end of therapy, one patient suffered the new coronavirus infection, COVID-19. A month later, residual formation of SUVmax 14.2 remained in the mediastinum. The patient is currently under observation. With a median follow-up of 36 months (9 to 76 months) all 34 patients are in remission.Conclusion. The effectiveness of PML-16 made it possible to abandon the consolidation therapy and refuted the idea of the need for 6 courses of CT. The combination of programs based on the application of the principle of high-dose shortpulse induction of remission (R-mNHL-BFM-90) in combination with the prolonged administration of medium doses (R-EPOCH) was crucial in achieving a successful result. The inclusion of lenalidomide in the “PML-19” program made it possible to achieve complete remission in 100 % of cases after 4 courses. The possibility of using DNA analysis to assess MRD in patients with PML was shown.

Popper’s Demarcation Criterion Between Science and Metaphysics: A Critical Analysis

Karl Raimund Popper, (1902-1994) a leading apostle of antiinductivism, holds that the main problem of philosophy of science is the problem of demarcation. Accordingly, the demarcation principle distinguishes science from non-science. To Popper, logic, metaphysics and psychoanalysis are likely to fall into the non-science group. Principle of induction has been accepted even though resentfully as the chief tool of scientific investigation by the positivists as well as the scientists in general. Popper rejects the positivistic approach and on the contrary proposes falsifiablity to furnish his iconoclastic project. This paper intends to indentify the problem of his very approaches in order to hold that in spite of some difficulties in the problem of induction itself, as the identifier of science, we do not have any alternative to save science from metaphysics. Finally, Popper’s so-called demarcation criterion is extensively examined here with a view to defend material aspect of inductive generalization. Philosophy and Progress, Vol#67-68; No#1-2; Jan-Dec 2020 P 33-48

A SMART DATA APPROACH TO ANALYZE VEHICLE FLOWS

Abstract. In the logic of Smart Cities it is of fundamental importance to analyze the traffic situation through dedicated sensors and networks. According to this approach and through the potential of smart data is based this study. Improve prediction of traffic patterns by analyzing and counting vehicles in a virtualized scene in real time. In the past, the technique of hardware inductive coils was used that were dropped in the asphalt to exploit the principle of magnetic induction in order to verify the transit of vehicles. This technique is not able to classify vehicles or estimate their speed, unless using multiple inductive coils. The proposed system provides for the virtualization of an area of interest which requires a selection and mapping of the areas where the control areas are to be included. The “image detection” techniques allow us to classify the vehicles in transit. With the techniques of “machine learning” can to able to verify the flow, count the vehicles present in the scene and classify them by vehicle type in real time. The vehicle counting and classification data available in the cloud platform allow to model and update the main nodes of the network in order to improve the prediction and estimates of the best routes of the road network according to the degree of saturation of the flows and the length of the line of the graph. The model can also indicate additional information of an environmental nature in an ITS system present in the cloud.

Stimulus diversity increases category-based fear generalization and the effect of intolerance of uncertainty

Fear generalization refers to conditioned fear responses extending to related stimuli and fear overgeneralization is a key feature of pathological anxiety. Along with perception similarity, conceptual relations affect fear generalization. We investigated whether stimulus diversity–an important principle of category-based induction–influences fear generalization. Induction studies have shown that generalization from a premise involving diverse instances is stronger than that from non-diverse instances. We adopted this framework for fear learning and established two groups. The diverse group developed fear in response to diverse instances from one category, while the non-diverse group acquired fear of non-diverse instances from the same category. An effect of stimulus diversity was observed in shock-expectancy ratings, with the diverse group displaying higher fear generalization than the non-diverse group. We also tested whether intolerance of uncertainty (IU) might affect the difference in fear generalization between the two conditions. Individuals with higher IU showed reduced difference in fear generalization between two conditions, mainly driven by heightened fear generalization to novel stimulus with ambiguous threat levels in the non-diverse condition. This study helps illustrate the mechanisms behind differential category-based fear generalization and provides a potential explanation for why higher IU individuals may develop anxiety disorders following trauma.

Cellulose hydrogel-based biodegradable and recyclable magnetoelectric composites for electromechanical conversion

Flexible electromechanical conversion devices have attracted enormous attention as energy harvesters and self-powered sensors in the fields of wearable electronics and robotics. However, current flexible devices composed of plastic polymers and metals suffer from non-degradability and limited recyclability. Herein, a biodegradable and recyclable hydrogel-based magnetoelectric (ME) composite is fabricated via introducing NdFeB magnetic particles and copper wires into the regenerated bacterial cellulose (rBC) hydrogel. The developed hydrogel-based ME composites can effectively convert the mechanical kinetic energy into electrical energy based on the principle of electromagnetic induction, which maximum voltage reaches 15 μV. In addition, degradation experiments are conducted in this work to demonstrate the hydrogel can be rapidly degraded within 3 h under the condition of enzyme and completely natural degraded within 49 days in water, respectively. Moreover, the left NdFeB particles and copper wires can be recyclable and reused for the same devices, leaving no environmentally hazardous electronic waste.