bluuebunny/crossref_metadata_2025_split huggingface dataset:
ROTOR SPEED OBSERVER OF ASYNCHRONOUS GATE CASCADE
Authors: Klyuyev O. , Sadovoi O. , Sokhina Y. 
Published: June 2022

The vector control system of an asynchronous motor, which is closed in terms of the rotor speed, assumes the presence of a sensor on the shaft of the electric machine. However, in practice, often there are problems of regulating the speed of rotation of asynchronous electric drives, in the solution of which the use of mechanical movement coordinate sensors is technically irrational or impossible. In this case, it is necessary to use one of the sensorless vector control algorithms, which involve direct measurement of only electrical quantities. In rotor vector control systems, when the stator is connected to the network at the same time, the need to measure the angle of rotation of the rotor relative to the stator is added, which complicates the structure of the observer.
For the synthesis of speed observers in asynchronous electric drives, the approach known in control theory is widely used, in which, based on the second Lyapunov method, an adaptation function is formed that provides asymptotic convergence of the adaptive model to the reference one.
In this paper, the synthesis of the rotor speed observer of an asynchronous gate cascade (AGC) was carried out for its application in a sensorless relay-vector control system. Equations of electromagnetic processes in an asynchronous machine, formulas for coordinate transformations and an identifier for the position angle of the rotor AGC were used as initial mathematical models. The observer synthesis is based on the second Lyapunov method, which allows to determine the structure of the adaptation function, which adjusts the adaptive model in such a way that the difference between the outputs of the adaptive and reference models tends to zero. Thus, the adaptation function, which uses the stator flux vector, ensures the asymptotic stability of the perturbed motion. The proposed speed observer AGC differs from the known observers for stator control in that, along with the speed calculation, the trigonometric functions of the rotor rotation angle are determined, and the structure of the observer includes coordinate transducers that are absent in stator vector control systems, since they do not need to calculate the projections of the voltage vector of one part of the machine onto the orthogonal axes of its other part.
FUZZY REGULATOR OF THE ROD SUPPLY SYSTEM OF ARDUINO-BASED CROSS-WEDGE ROLLING MILL IN LABVIEW ENVIRONMENT
Authors: Bagriy V. , Voloshyn R. , Voloshina K. 
Published: June 2022

The main purpose of scientific work is to develop a regulator based on fuzzy logic for an electronic control system for the supply of bar billets in automated cross-wedge rolling complexes.
Cross-wedge rolling belongs to the advanced energy-saving technologies where technological processes based on metal cutting are replaced by economic processes of plastic forming of details. The analysis showed that coefficient increase of metal utilization requires loss decrease arising from the supply inaccuracy of the bar workpiece to the length of the part. The task is to reproduce the given law of motion of the actuator, i.e. to ensure maximum speed, smooth acceleration and braking with the possibility of a shockless stop at the end of the stroke. The solution of this problem is proposed to be carried out by entering the fuzzy control unit into the structure of the system for controlling the supply..
The hardware basis of the control system in this work is the Arduino hardware and software complex based on the Atmel AVR microcontroller. The software model of the control system is developed in the graphical programming environment LabVIEW, which is widely used as a standard tool for data collection and control of devices in industry, education and research laboratories. The construction of a fuzzy regulator and its implementation are considered using Fuzzy Logic Designer.
On the basis of systematized knowledge about the object of research, its characteristics and features, linguistic input and output variables were selected, as well as membership functions and a fuzzy production model of knowledge was formulated. The configuration of the control system depends on the number of controlled outputs and controlled input data and in this case the MISO information structure is applied. The paper presents the front panel of the virtual device developed by LabVIEW, which is designed to display information about the current state of the system. The purpose of the developed fuzzy regulator model is to output the value of the initial air pressure in the cavity of the actuating pneumatic cylinder, which will create an air cushion in the process of advancing the piston, which has properties similar to those of a normal spring. Smooth stopping of the piston is provided by the coordinated choice of rigidity of a pneumatic spring taking into account length of a detail and weight of a rod and allows us to reduce kinetic energy in an end point of positioning that increases accuracy of supply.
The analysis of research results confirmed the efficiency and adequacy of the model used and the developed set of operation rules of the fuzzy regulator. Testing of the control system on parts of different lengths confirmed a reduction in total losses and an increase in the utilization of the metal.
MODEL OF ROLLING RODS IN THE ROLL PASS OF THE OVAL-ROUND
Authors: Samokhval V. , Maksimenko O. , Nikulin O. , Pryimak A. 
Published: June 2022

For modern high-speed rolling mills, stable and efficient operation is possible only with the use of automatic process control systems. Such systems involve the use of certain process models, both for control and technology development. Therefore, research aimed at improving existing models of the process of rolling rods and developing new ones remains relevant.
The aim is to improve the model of the process of rolling rods of round cross-section using a system of passes "oval-round", suitable for the development of technology (determining the size of pass and power parameters) and as software for automatic process control systems.
A characteristic difference of the proposed improved model is the application of the condition of volume constancy to determine not only the speed but also the deformation parameters of rolling. Features of the model also include the appointment of the ratio of the axes of oval passes and the use of the rate of mismatch in the interstand spaces to control and minimize tension.The sequence of calculations in the model includes an iterative procedure with three mandatory approximations, which involves adjusting the coefficients of elongation using the condition of constant volume, and adjusting the size of the workpieces using speed mismatch as a factor characterizing the corresponding tension or compressive.
The model uses known expression and geometric relationships, the combination and sequence of which provides the definition of technological parameters and sizes of roll passes with the required accuracy. The program can be implemented in various forms depending on the needs, from the most common applications to environments of professional computer systems. The model can be used as a basis for the development of systems for automatic control of the rolling process for the conditions of the existing mills.
Novel MRI-based vertebral bone quality score as a predictor of cage subsidence following transforaminal lumbar interbody fusion
Authors: Hu Yung-Hsueh , Yeh Yu-Cheng , Niu Chi-Chien , Hsieh Ming-Kai , Tsai Tsung-Ting , Chen Wen-Jer , Lai Po-Liang 
Published: June 2022

OBJECTIVE
Decreased bone mineral density as measured by dual-energy x-ray absorptiometry (DEXA) has been reported to be associated with cage subsidence following transforaminal lumbar interbody fusion (TLIF). However, DEXA is not often available or routinely performed before surgery. A novel MRI-based vertebral bone quality (VBQ) score has been developed and reported to be correlated with DEXA T-scores. The authors investigated the ability of the VBQ score to predict cage subsidence and other risk factors associated with this complication.

METHODS
In this retrospective study, the authors reviewed the records of patients who had undergone single-level TLIF from March 2014 to October 2015 and had a follow-up of more than 2 years. Cage subsidence was measured as postoperative disc height loss and was graded according to the system proposed by Marchi et al. The MRI-based VBQ score was measured on T1-weighted images. Univariable analysis and multivariable binary logistic regression analysis were performed. Ad hoc analysis with receiver operating characteristic curve analysis was performed to assess the predictive ability of the significant continuous variables. Additional analyses were used to determine the correlations between the VBQ score and T-scores and between the significant continuous variables and the amount of cage subsidence.

RESULTS
Among 242 patients eligible for study inclusion, 111 (45.87%) had cage subsidence after the index operation. Multivariable logistic regression analyses demonstrated that an increased VBQ score (OR 14.615 ± 0.377, p < 0.001), decreased depth ratio (OR 0.011 ± 1.796, p = 0.013), and the use of kidney-shaped cages instead of bullet-shaped cages (OR 2.766 ± 0.358, p = 0.008) were associated with increased cage subsidence. The VBQ score was shown to significantly predict cage subsidence with an accuracy of 85.6%. The VBQ score was found to be moderately correlated with DEXA T-scores of the total hip (r = −0.540, p < 0.001) and the lumbar spine (r = −0.546, p < 0.001). The amount of cage subsidence was moderately correlated with the VBQ score (r = 0.512, p < 0.001).

CONCLUSIONS
Increased VBQ scores, posteriorly placed cages, and kidney-shaped cages were risk factors for cage subsidence. The VBQ score was shown to be a good predictor of cage subsidence, was moderately correlated with DEXA T-scores for the total hip and lumbar spine, and also had a moderate correlation with the amount of cage subsidence.
Comparison of supratentorial meningioma resection outcomes by dural reconstruction technique
Authors: Chotai Silky , Tang Alan R. , McDermott Jake R. , Guidry Bradley S. , Grisham Candace J. , Yengo-Kahn Aaron M. , Morone Peter J. , Thompson Reid C. , Chambless Lola B. 
Published: June 2022

OBJECTIVE
Excision of intracranial meningiomas often requires resection or coagulation of the dura mater. The choice of dural closure technique is individualized and based on surgeon preference. The objective of this study was to determine outcomes following various dural closure techniques for supratentorial meningiomas.

METHODS
A retrospective, single-center cohort study was performed for patients who underwent excision of supratentorial meningiomas from 2000 to 2019. Outcomes including operative time, postoperative in-hospital complications, readmission, causes of readmission including surgical site infection, pseudomeningocele, need for shunt surgery, and imaging appearance of pseudomeningocele on long-term follow-up imaging were compared. Univariate and multivariable analyses were conducted.

RESULTS
A total of 353 patients who had complete clinical and operative data available for review were included. Of these patients, 227 (64.3%) had nonsutured dural graft reconstruction and 126 (35.7%) had sutured dural repair, including primary closure, artificial dura, or pericranial graft. There was significant variability in using nonsutured dural reconstruction compared with sutured dural repair technique among surgeons (p < 0.001). Tumors with sagittal sinus involvement were more likely to undergo nonsutured closure (n = 79, 34.8%) than dural repair (n = 26, 20.6%) (p = 0.003). There were no other differences in preoperative imaging findings or WHO grade. Frequency of surgical site infection and pseudomeningocele, need for shunt surgery, and recurrence were similar between those undergoing nonsutured and those undergoing sutured dural repair. The mean operative time for the study cohort was 234.9 (SD 106.6) minutes. The nonsutured dural reconstruction group had a significantly shorter mean operative time (223.9 [SD 99.7] minutes) than the sutured dural repair group (254.5 [SD 115.8] minutes) (p = 0.015). In a multivariable linear regression analysis, after controlling for tumor size and sinus involvement, nonsutured dural graft reconstruction was associated with a 36.8-minute reduction (95% CI −60.3 to −13.2 minutes; p = 0.002) in operative time.

CONCLUSIONS
Dural reconstruction using a nonsutured graft and sutured dural repair exhibit similar postoperative outcomes for patients undergoing resection for supratentorial meningiomas. Although sutured grafts may sometimes be necessary, nonsutured graft reconstruction for most supratentorial meningioma resections may suffice. The decreased operative time associated with nonsutured grafts may ultimately result in cost savings. These findings should be taken into consideration when selecting a dural reconstruction technique for supratentorial meningioma.
Effect of endovascular treatment within 6 hours for acute basilar artery occlusion
Authors: Yang Jie , Li Fengli , Qiu Zhongming , Wang Yan , Luo Jun , Wu Youlin , Zeng Guoyong , Wan Yue , Liu Shuai , Yue Chengsong , Song Jiaxing , Luo Weidong , Liu Chang , Li Linyu , Sun Ruidi , Huang Jiacheng , Sang Hongfei , Zhao Chenhao , Yang Qingwu , Zi Wenjie 
Published: June 2022

OBJECTIVE
The aim of this study was to investigate the efficacy and safety of endovascular treatment (EVT) plus standard medical treatment (SMT) in patients with acute basilar artery occlusion (BAO) within 6 hours of the estimated occlusion time, based on a Chinese population.

METHODS
The authors selected patients from the Endovascular Treatment of Acute Basilar Artery Occlusion Study (BASILAR) registry, which was a nationwide prospective registry, within 6 hours after the estimated time of onset of a stroke in acute BAO. Patients were divided into the SMT-alone group or the EVT+SMT group according to treatment modalities. The primary outcome was a favorable functional outcome, defined as a modified Rankin Scale score between 0 and 3 at 90 days. Safety outcomes included death at 90 days and symptomatic intracerebral hemorrhage.

RESULTS
The authors assessed 590 patients for eligibility. Of these patients, 127 received SMT alone and 463 were treated with EVT plus SMT. EVT was associated with a higher rate of a favorable functional outcome (adjusted OR 3.804, 95% CI 1.890–7.658; p < 0.001) and a lower proportion of deaths at 90 days (adjusted OR 0.364, 95% CI 0.223–0.594; p < 0.001). Lower age (adjusted OR 0.978, 95% CI 0.960–0.997; p = 0.022); lower baseline National Institutes of Health Stroke Scale score (adjusted OR 0.926, 95% CI 0.902–0.950; p < 0.001); higher baseline posterior circulation Alberta Stroke Program Early CT Score (adjusted OR 1.681, 95% CI 1.424–1.984; p < 0.001); absence of diabetes mellitus (adjusted OR 0.482, 95% CI 0.267–0.871; p = 0.016); and modified Thrombolysis in Cerebral Infarction scores 2b–3 (adjusted OR 5.117, 95% CI 2.304–11.367; p < 0.001) were independent factors for a favorable outcome in the EVT+SMT group.

CONCLUSIONS
Based on the study design, patients with acute BAO who received EVT within 6 hours were associated with improved favorable outcome and decreased deaths compared with patients who received SMT. Predictors of desirable outcome in patients undergoing EVT included lower age, lower baseline National Institutes of Health Stroke Scale score, higher baseline posterior circulation Alberta Stroke Program Early CT Score, absence of diabetes mellitus, and modified Thrombolysis in Cerebral Infarction scores 2b–3.
Prognostic impact of the multimodal treatment approach in patients with C19MC-altered embryonal tumor with multilayered rosettes
Authors: Sugawa Masahiro , Fukuoka Kohei , Mori Makiko , Arakawa Yuki , Tanami Yutaka , Nobusawa Sumihito , Hirato Junko , Nakazawa Atsuko , Kurihara Jun , Koh Katsuyoshi 
Published: June 2022

OBJECTIVE
Embryonal tumor with multilayered rosettes (ETMR) is one of the childhood central nervous system tumors with the poorest prognosis; thus, establishing an optimal treatment strategy is essential, However, because of the low incidence and molecular heterogeneity of the tumor, the optimal treatment has not yet been determined. In this study the authors evaluated the prognostic impact of a multimodal treatment approach in patients with ETMR.

METHODS
The authors evaluated 4 patients with ETMR at their institution who showed varied clinical features and also conducted clinical characterization and prognostic analysis of previously reported cases of the ETMR-presenting locus 19q13.42 with a chromosome 19 microRNA cluster (C19MC) amplification, which is known to be a diagnostic hallmark of the tumor.

RESULTS
Of the 4 patients with ETMR in the authors’ institution, in 1 case the patient’s tumor showed a neuroblastoma-like appearance without multilayered rosettes; however, the diagnosis was confirmed by the presence of amplified C19MC. From a clinical standpoint, 2 patients who underwent gross-total resection (GTR) of the tumor and chemotherapy followed by high-dose chemotherapy (HDC) had long-term complete remission with or without local irradiation. In the multivariate analysis of 43 cases with C19MC-altered ETMR reported in the literature, HDC and local irradiation were significantly correlated with better event-free survival (HR 0.17, p = 0.0087; HR 0.17, p = 0.010) and overall survival (OS) (HR 0.29, p = 0.023; HR 0.28, p = 0.019), respectively. GTR was also correlated with better OS (HR 0.40, p = 0.039).

CONCLUSIONS
This case series demonstrated pathological and clinical heterogeneity among ETMR cases and the diagnostic importance of the molecular genetic approach among embryonal tumors, particularly during infancy. Based on the results of the analysis of molecularly uniformed ETMR cases, multimodal treatment may play a significant role in the prognosis of these tumors.
ELASTIC BENDING OF A STRIP WITH A SIGNIFICANT DEFLECTION UNDER THE ACTION OF APPLIED FORCES AND MOMENT
Authors: Kresan Тetiana , Pylypaka Serhiy , Hropost Vyacheslav , Babka Vitaliy 
Published: June 2022

The elastic bending of a strip of rectangular cross-section in the form of a cantilevered rod is considered. In the course of resistance of materials problems of deformation of beams under the influence of the applied forces and the moments allowing insignificant deflections are usually considered. Due to the small angular displacements of the elastic line, a simplified expression of its curvature is adopted, and the theory of bending in this case is linear. At considerable deflections of cores the linear theory of a bend cannot be used, it is necessary to use exact expression of curvature of a longitudinal elastic axis of a core.
The article considers the folding of a strip with its small thickness in comparison with the width, which can be exemplified by a ruler. It is assumed that the strip material works resiliently according to Hooke's law and after the cessation of the deforming forces completely restores its shape. Due to the small thickness of the strip in the plane of the bend in comparison with the length of this strip, the displacement of the end of the point of the strip are significant. At the same time, in any small volume of this band with linear dimensions of the order of its thickness, all deformations remain small. Thus, with small internal elastic deformations, large displacements of the end of the cantilever strip are achieved during its bending.
Under the action of applied forces and moments, the elastic axis of the strip acquires a curvilinear shape, which is determined by the dependence of its curvature on the length of the arc. According to the theory of elastic bending, the curvature of the strip is directly proportional to the applied moment and inversely proportional to its stiffness. This dependence of the curvature is a natural equation of the curve. In differential geometry, there are formulas for the transition from the natural equation of the curve to the parametric equations on which the curve can be constructed. However, this transition to the final result is almost impossible due to the double integration of expressions, even for the simplest cases of band load. For example, under the action of a concentrated force at the end of the console, the moment has a linear relationship. The curve with a linear natural equation is known and is called clothoid. However, its construction must be carried out by numerical methods. The paper considers this case in combination with the action of the applied moment and constructs the elastic axis of the strip.
TO THE QUESTION OF GEOMETRIC MODELING OF ORGANIZATIONAL CLUSTER STRUCTURES IN ORTHODOXY
Authors: Tereschuk Mykola 
Published: June 2022

The current stage of development of our state is characterized by a return to the Christian worldview after many years of forced atheism. Therefore, in many cities and villages of Ukraine, temples and monasteries are being revived, religious buildings and monuments are being intensively repaired, reconstructed and built, and places of pilgrimage are being arranged, and so on. At the same time, there are significant socio-economic changes, in particular, new market conditions, land, medical and educational reforms, decentralization of public administration, etc. These facts emphasize the high spiritual and material dynamism of today's life. Its complexity is increasing due to the COVID-19 pandemic, the armed conflict with Russia and other common points. In addition, everyone usually has personal problems.
The Orthodox Christian religion has always proclaimed love for one's neighbor as a great moral value. Various human activities, including the above, are characterized by the widespread use of information technologies. In many cases, one of the foundations of which is computer graphics. The advantage of geometric models compared to analytical ones is their simplicity, clarity, ease of use. The development of new mathematical tools, which are aimed at the effective practical implementation of spiritual activities among the population, is a godly task. On this basis, the selected topic can be considered quite relevant.
The main purpose of this publication is to highlight the proposed methodology for the automated reproduction of organizational cluster structures in Orthodoxy. The obtained scientific applied achievements represent a developed approach to modeling church management and related religious territorial Christian communities in the form of dioceses and parishes. On the basis of the given strategy new complex geometrical models for optimization of activity of orthodox churches are constructed. This concerns the more rational placement of temples and chapels, the definition of the proper boundaries of parishes and dioceses, the determination of the need for their unification or liquidation, the establishment of new ones, and so on. The paper outlines the prospects for the necessary further research.