bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Dynamic Programming Model for Calculating the Maximum Number of Gathering Passengers in High-Speed Railway Station Based on Gaussian distribution
Authors: Xia Xiong , Hou Wei , Li Xin 
Published: April 2023

Abstract
in this paper, based on the actual train operation plan and evacuation plan of the high-speed railway station, taking the train capacity and occupancy rate as the basic data, the Gaussian function is used to describe the passenger arrival law and the uniform distribution is used to describe the passenger evacuation law. Also, the calculation model of the number of gathering passengers at the high-speed railway station is established by MATLAB. Taking Guangzhou South Railway Station as an actual case, the maximum number of gathering passengers in the whole day and the change curve of the number of gathering passengers with time are obtained. The calculation results are consistent with the actual situation, which can provide a reference for the passenger flow organization and management of the high-speed railway station and the new construction and reconstruction of the high-speed railway station.
Tunneling Time of the Triangular Barrier and the Rectangular Barrier
Authors: Li Qingling , Zheng Shuang 
Published: April 2023

Abstract
In this paper, we calculate the phase time and dwell time of the triangular barrier and the rectangular barrier. The phase time and dwell time firstly increase and then decrease with wave number. In the tunneling region, the phase time decreases with the increase of barrier height, and firstly decreases and then increases with the increase of barrier width. Dwell time decreases with the increase of barrier height and increases with the increase of barrier width.
Conceptual options for solving the problem of icing rollers and drums of belt conveyors
Authors: Minin Ivan , Nedyalkov Petko , Hristova Teodora , Kraychev Evgeni , Dimov Emil 
Published: April 2023

Abstract
In the current development, the object is the icing of drums of belt conveyors that work in open mines located at high altitudes and in winter conditions. A literature review was made of publications related to the problems at low temperatures and the presence of moisture, including the icing of rollers and drums of belt conveyors. Conceptual options are suggested to prevent freezing and related accidents. The options are accompanied by short methods for determining the main technical parameters. Finally, the advantages and disadvantages of the described options are indicated and, in conclusion, the best among them for the specific working conditions. A stationary or a mobile heater is chosen as a better option.
Complex diagnostics of concrete lining technical condition
Authors: Skipochka Serhii , Serhiienko Viktor , Amelin Volodymyr , Amelina Larysa 
Published: April 2023

Abstract
The main use of concrete lining is mine and hydraulic engineering construction. The options of its use in underground structures and mining operations have been considered. The advantages of this lining during construction and operation have been reflected. A long service life of underground facilities with concrete lining in Ukraine has been noted. The typical defect types have been identified. The main reasons for defect formation have been reflected. The impact of natural factors on the deterioration of the lining has been researched. The possible consequences of the flaw growth have been reported. Limited opportunities for visual inspection of the concrete surface have been noted. The main areas of non-destructive test of linings have been analyzed. The basic set of methods and control devices have been established. Special features of monitoring with various methods have been indicated. The main requirements for the registration of primary data have been defined. Typical options of office data processing have been outlined. According to the processing results, the category of the technical condition of the lining is determined. Criteria for assessing the technical condition have been presented. Specific examples of complex examination of concrete lining have been provided.
Numerical analysis of aerodynamic regime near tailings storage facility
Authors: Semenenko Evhen , Medvedieva Olha , Biliaiev Mykola , Rusakova Tetiana , Blyuss Konstantin 
Published: April 2023

Abstract
Tailings formed during the mining and beneficiation of iron ore are sources of intensive dust generation. In order to assess the intensity of dust formation and determine the effectiveness of methods of its reduction, it is necessary to know the local velocity of the air flow near the various surfaces of the tailings storage facility. For the theoretical solution of this problem, a CFD model was developed, which allows determining the velocity field of the air flow when flowing around the tailings storage facility. The model allows you to obtain the value of the wind speed near the surfaces of the structure and, based on this information, to make a forecast of possible dust formation. The constructed CFD model is based on the use of an aerodynamic model of potential motion. The modeling equation is the Laplace equation for the velocity potential. To build a numerical model, the idea of establishing a solution in time is used, therefore numerical integration of the “unsteady equation” for the velocity potential is carried out. Numerical integration is carried out using the finite-difference method of total approximation. The results of the computational experiment are presented.
Influence of waste rock dump placement on the geomechanical state of underground mine workings
Authors: Petlovanyi Mykhailo , Sai Kateryna , Malashkevych Dmytro , Popovych Vasyl , Khorolskyi Andrii 
Published: April 2023

Abstract
This paper is devoted to assessing the influence of waste rock surface dumps on the geomechanical state of underground mine workings. The conditions of the Pivdenno-Bilozerskyi high-grade iron ore field are chosen as the research object. To study the influence of dump placement and the depth of mine working on the mass stress state on the contour of sublevel drifts, a numerical modeling methodology based on the SolidWorks software package has been developed. This methodology involves the substantiation of the elements and properties of the geomechanical model, as well as the calculation scheme. Polynomial patterns of changing stress value in the hanging wall drift sides have been determined in the depth intervals of 440–740 m depending on the distance of the dump to the geometric center of the stope chamber. It has been revealed that the degree of the waste rock dump influence on the stress state gradually decreases with depth. It has been found that the maximum degree of the waste rock dump influence is observed on the upper horizons. When the waste rock dump is located above the geometric center of the future stope chamber that the stress value on the contour of the hanging wall drift can increase up to 10% compared to the absence of a dump on the earth’s surface. The research results are important for designing stable parameters for supporting sublevel drifts in difficult conditions of occurrence of the hanging wall rocks.
Substantiating the parameters for a non-circular structure of the mine shaft under construction in a heterogeneous rock massif
Authors: Alkhdour Ahmad , Tiutkin Oleksii , Bannikov Dmytro , Heletiuk Ihor 
Published: April 2023

Abstract
Mine shafts are those workings without which the normal operation of coal enterprises and underground construction facilities is impossible. The new experience in the construction of mine shafts for the Dnipro Metro is based on the rejection of prefabricated structures. In addition, the ellipse structure of the mine shaft 15 bis of the Dnipro Metro is uncharacteristic for construction in Soviet and post-Soviet Ukraine. That is why technological advancements in the design of vertical workings for the non-circular structure require scientific justification. The complexity of operating such underground facilities under the engineering and geological conditions in the city of Dnipro is the interaction with a heterogeneous massif. Therefore, the design of the mine shaft frame involves its division into parts (the so-called pile system and shotcrete system). The finite-element models of both systems have been developed. A search for the force factors in a non-circular structure of the shaft has been carried out; the parameters for both systems have been substantiated. The results of the analysis have made it possible to scientifically substantiate the structural solutions. They enable the prediction of high strength indicators of the mine shaft under construction in a heterogeneous rock massif.
Regularities of the stress state of the rock massif around the single-vault station under construction by NATM
Authors: Radkevych Anatolii , Tiutkin Oleksii , Kuprii Volodymyr , Tkach Taisiia 
Published: April 2023

Abstract
Subway stations are underground facilities of high responsibility. The use of new construction technologies requires their scientific justification. The single-vault station “Teatralna” of the Dnipro Metro is designed as one that is under construction by the New Austrian tunneling method. Since this type of station is a working of a large cross-section, it is necessary to determine the stress state of the rock massif, which affects the temporary fastening. The finite-element model is developed, which shows the stages of cross-section opening. The developed model reproduces the layout of the subway station in the rock massif and the characteristics of the temporary fastening. The numerical analysis for six stages of station construction is carried out. The distributive features of horizontal stresses and the asymmetry of the stress state of the rock massif are clarified. For the first time, the regularities of the rock massif around the single-vault station under construction by the New Austrian tunneling method are obtained. It is established that the maximum of horizontal stresses appears at the stage of opening the lower left part of the cross-section.
Analytical determination of transient current flowing through a human in contact with conductive objects under high voltage power lines
Authors: Petrov Petar , Velev Georgi , Ivanov Krasimir 
Published: April 2023

Abstract
The paper inhere presents an approach for calculation of transient currents flowing through a human in contact with conductive objects under high voltage (HV) power lines by means of analytical expressions derived for that purpose. Three different case studies have been investigated and their respective equivalent circuit’s parameters have been specified and implemented: contact of an insulated from earth person with the steel-tower pole of an outdoor high voltage power line; contact of a non-insulated from earth person with a vehicle under a high voltage power line; contact of an insulated from earth person with a vehicle under a high voltage power line. The derived mathematical models and expressions have been obtained using the Mirror images method and Maxwell’s potential coefficients and the transient current trough the human body has been calculated using the Classical method for analysis of transient processes in linear electrical circuits. Conclusions have been made in regard with the degree of danger of electric shock for the three discussed case studies depending on the rated voltage and the geometrical properties of the most often met high voltage power lines in EU.
Study of vertically mounted photovoltaic modules and their influence on the production of electrical energy in free-standing photovoltaic systems using PVGIS-CMSAF
Authors: Varbov Tsvyatko , Velev Georgi , Ivanov Krasimir 
Published: April 2023

Abstract
The paper inhere explores the impact of the azimuth angle of vertically mounted bifacial photovoltaic modules on annual electricity generation. At the recent years bifacial photovoltaic modules are introduced to the market, opening new opportunities for increasing efficiency of electricity production and decreasing of the space needed for installation. The purpose of the current study is to obtain and evaluate the annual electricity production of bifacial vertically mounted photovoltaic modules in dependence on the orientation. Comparative analysis has been made between the efficiency and annual energy yield of bifacial vertically mounted PV modules and classically installed PV modules. All the calculations and analyses have been made with the aid of the software product PVGIS-CMSAF. Despite of the controversial increase of efficiency of bifacial vertically mounted photovoltaic modules compared to classically installed photovoltaic modules, the study had confirmed some of their advantages: they require less space for installation; can be used also as PV fences or noise barriers; in some cases the land of installation can be cultivated, used for agriculture or animal husbandry.
The concept of risk-based technical solutions for the protection of coal mine workings
Authors: Skipochka Serhii , Palamarchuk Tetiana , Prokhorets Liliya 
Published: April 2023

Annotation
The concept of risk-based technical solutions for the protection of coal mines workings is outlined. The initial data of effective risk management methods are substantiated. A mixed method of risks assessment has been used. The method involves building a matrix of consequences and probabilities by ranking them in the form of tables. The following data have been used as initial data: location, method and parameters of the workings protection, additional measures to manage the state of the rock mass around the workings, cost of certain types of work and material costs, purpose and term operation of the workings. Technical solutions for the protection of underground workings in coal mines to increase labor safety and reduce environmental and financial risks are substantiated. Initial data for effective methods of risks management in the protection of workings in difficult mining and technical conditions have been prepared. It is recommended to use these data as the basis of the new regulatory framework.
Zircon processing in sodium carbonate melt
Authors: Mukhachev Anatoliy , Shevchenko Volodymyr , Yelatontsev Dmytro 
Published: April 2023

Abstract
The process of alkaline zircon processing with soda and a mixture of soda with intensifying additives carbon and NaOH was studied. As a result, a complete exclusion of acid-soluble sodium zirconosilicate formation was ensured. The introduction of carbon into soda melt increased the agent’s reactivity due to the formation of highly reactive Na2O. At 1100 °C, the optimal amount of introduced carbon is 4 wt.%, while the duration of the process is reduced to 10 minutes. Zircon processing in two stages – at 1150 °C and 1000 °C with the soda addition from 2.5 to 4.0 wt.% provided the production of metazirconate and sodium silicate, excluding the transition of silicon to the solid phase, providing an opening degree > 99%. The novel bakor-lined electric furnace of high operational reliability has been successfully tested. Carbonization of the sodium silicate solution in the presence of water vapor ensures complete precipitation of hydrated silicon dioxide, with a bulk density of 150 g/L. The optimal concentration of CO2 is ~ 8%, which allows using off-gases from thermal power plants for carbonization. The presence of water vapor in the gaseous phase increases the utilization of CO2 and Na2CO3 regeneration.
Fossil fuel-related CO2 emissions modelling in Ukraine using Multiple Linear Regression and Artificial Neural Networks
Authors: Batur Maryna , Babii Kateryna 
Published: April 2023

Abstract
The constant growth of carbon emissions is one of the main causes of global warming, which in turn leads to the adverse environmental effects involving a risk of droughts, wildfires, flooding, glacier melting, etc. Ukraine is not among priority countries for greenhouse gases emitters. However, from both, an economic and environmental points of view, monitoring and on-time analysis of CO2 emissions will help beforehand to determine the main drivers of CO2 emissions and, thus, will serve as a base for government to set a number of programs on reducing of greenhouse gases (GHG) or adapting to it. The aim of this paper is to offer the mathematical model for fossil fuel-related CO2 emissions forecasting using statistical technique of Multiple Linear Regression (MLR) and computing method of Artificial Neural Networks (ANN). Three different models are obtained to predict CO2 emissions from coal, oil, and natural gas consumptions taking into account the main carbon drivers. Based on the accuracy assessment analysis, models derived with ANN reveals in more accurate prediction than those obtained with MLR. Therefore, ANN models can be applied while planning several steps ahead and planning out every conceivable worst-case scenario, protecting against it.
Spall fracture forms of high rock samples under uniaxial compression
Authors: Vasyliev Leonid , Bulich Yurii , Vasyliev Dmytro , Malich Mykola , Rizo Zakhar , Polishchuk Alla , Kress Denis , Kuttiubaev Aidar 
Published: April 2023

Abstract
Prof. L.I. Baron identified five forms of destruction during uniaxial compression of samples of regular geometry of rocks including truncated wedge, wedge, diagonal, longitudinal, and explosive forms. All of them are commonly characterized by the destruction of samples in their central parts showing two or more cracks, while the trajectories of crack development align with the corner points of the samples. Recently, was unexpectedly discovered a spall fracture in the form of a single crack emerged from the side wall of the specimen and propagating into it under uniaxial compression. Based on the discovery, the method for creating stress-strain diagrams for high rock samples was developed using four rock properties such as rock shear resistance limit, contact friction ratio, internal friction ratio, and modulus of elasticity. The stress-strain diagram of the spall fracture of high samples is described by a descending curve, which is typical for the diagrams of fracture created by two adjacent cracks of regular geometry samples. The maximum stresses required for the destruction of high rock samples are lower than those for the destruction of regular geometry samples of rocks with similar physical and mechanical properties.
PROSER: A Web-Based Peripheral Blood Smear Interpretation Support Tool Utilizing Electronic Health Record Data
Authors: Iscoe Mark S , Loza Andrew J , Turbiville Donald , Campbell Sheldon M , Peaper David R , Balbuena-Merle Raisa I , Hauser Ronald G 
Published: April 2023

Abstract

Objectives
Peripheral blood smear (PBS) interpretation represents a cornerstone of pathology practice and resident training but has remained largely static for decades. Here, we describe a novel PBS interpretation support tool.

Methods
In a mixed-methods quality improvement study, a web-based clinical decision support (CDS) tool to assist pathologists in PBS interpretation, PROSER, was deployed in an academic hospital over a 2-month period in 2022. PROSER interfaced with the hospital system’s electronic health record and data warehouse to obtain and display relevant demographic, laboratory, and medication information for patients with pending PBS consults. PROSER used these data along with morphologic findings entered by the pathologist to draft a PBS interpretation using rule-based logic. We evaluated users’ perceptions of PROSER with a Likert-type survey.

Results
PROSER displayed 46 laboratory values with corresponding reference ranges and abnormal flags, allowed for entry of 14 microscopy findings, and computed 2 calculations based on laboratory values; it composed automated PBS reports using a library of 92 prewritten phrases. Overall, PROSER was well received by residents.

Conclusions
In this quality improvement study, we successfully deployed a web-based CDS tool for PBS interpretation. Future work is needed to quantitatively evaluate this intervention’s effects on clinical outcomes and resident training.
Esophageal Granular Cell Tumor in Children: A Clinicopathologic Study of 11 Cases and Review of the Literature
Authors: Malik Faizan , Bernieh Anas , Saad Ali G 
Published: April 2023

AbstractObjectivesGranular cell tumor (GCT) commonly presents in the subcutaneous tissue and head and neck region, and it is uncommon in the gastrointestinal tract. Experience with esophageal GCTs in the pediatric population is limited, with only 7 cases reported in the literature, 3 with eosinophilic esophagitis (EoE).MethodsCase information from 11 pediatric patients with GCTs of the esophagus was retrieved. H&E and immunohistochemical slides were reviewed with clinical, endoscopic, and follow-up data from all patients.ResultsIn total, 7 male and 4 female patients were included, with ages ranging from 3 to 14 years. Indications for esophagogastroduodenoscopy (EGD) included EoE (n = 3), follow-up for Crohn disease, and other nonspecific complaints. Endoscopically, all patients had a single submucosal, firm mass protruding into the lumen, with normal overlying mucosa. The nodules were removed endoscopically in multiple fragments in all cases. Histologically, the tumors showed sheets and trabeculae of cells containing bland nuclei, inconspicuous nucleoli, and abundant pink granular cytoplasm without atypical features. All tumors were immunoreactive for S100, CD68, and SOX10. Follow-up showed that all patients were disease-free (median, 2 years).ConclusionsWe report the largest series of pediatric esophageal GCTs with coincidental association with EoE. These EGD findings are characteristic, and removal by biopsy is both diagnostic and therapeutic.
Prenylated acetophenones from the roots of Calendula officinalis and their anti-inflammatory activity
Authors: Kadowaki Wataru , Miyata Ryo , Mizuno Sayaka , Fujinami Misa , Sato Yoshizumi , Kumazawa Shigenori 
Published: April 2023

ABSTRACT
Calendula officinalis is a medicinal plant in the Asteraceae family, and it has a broad range of biological activities. In this study, we focused on the roots of C. officinalis, which have remarkable anti-inflammatory properties. By using a bioassay-guided fractionation approach, prenylated acetophenones 1 and 2—of which 1 was previously unknown—were isolated, and their structures were determined by spectroscopic analysis. Both compounds decreased lipopolysaccharide-stimulated NO production in J774.1 cells. This study could lead to the use of the Calendula roots as a natural source of inflammatory mediators.
Early aging and premature vascular aging in chronic kidney disease
Authors: Tanriover Cem , Copur Sidar , Mutlu Ali , Peltek Ibrahim Batuhan , Galassi Andrea , Ciceri Paola , Cozzolino Mario , Kanbay Mehmet 
Published: April 2023

ABSTRACT
Aging is the progressive decline of body functions and a number of chronic conditions can lead to premature aging characterized by frailty, a diseased vasculature, osteoporosis, and muscle wasting. One of the major conditions associated with premature and accelerated aging is chronic kidney disease (CKD), which can also result in early vascular aging and the stiffening of the arteries. Premature vascular aging in CKD patients has been considered as a marker of prognosis of mortality and cardiovascular morbidity and therefore requires further attention. Oxidative stress, inflammation, advanced glycation end products, fructose, and an aberrant gut microbiota can contribute to the development of early aging in CKD patients. There are several key molecular pathways and molecules which play a role in aging and vascular aging including nuclear factor erythroid 2-related factor 2 (Nrf-2), AMP-activated protein kinase (AMPK), sirtuin 1 (SIRT1), and klotho. Potential therapeutic strategies can target these pathways. Future studies are needed to better understand the importance of premature aging and early vascular aging and to develop therapeutic alternatives for these conditions.