bluuebunny/crossref_metadata_2025 huggingface dataset:
GESTIÓN TURÍSTICA COMO HERRAMIENTA DE DESARROLLO SOSTENIBLE DE LA MICROCUENCA DEL RÍO CHIMBORAZO, CANTÓN RIOBAMBA
Authors: Ilbay Betty Paulina Aucancela , Samaniego Víctor Medardo Velasco
Published: December 2020

La gestión turística, herramienta para el desarrollo de la microcuenca del río Chimborazo, ubicada en las parroquias rurales de San Juan y Santiago de Calpi, cantón Riobamba, está compuesta por un abanico de parámetros referentes a planificación turística, desarrollo de productos turísticos y estrategias de promoción y comunicación, que, empleados de manera integral y sistemática, procuran alcanzar el desarrollo sostenible del sistema turístico local. En tal virtud, el objetivo principal del presente artículo es analizar la gestión turística y el desarrollo sostenible desde dos perspectivas: el grado de importancia y la realidad actual de cada variable, a fin de tener un criterio fundamentado para tomar decisiones acertadas a futuro. La investigación siguió el paradigma mixto, desarrollado como un estudio descriptivo y correlacional, con un diseño no experimental y transeccional, donde se integró lo cuantitativo y cualitativo para el análisis y procesamiento de la información. El criterio emitido por las unidades de análisis: actores turísticos y centros de turismo comunitario, sobre las variables estudiadas, permitió fundamentar teóricamente y establecer una relación estadística, que para el enfoque importancia, es equivalente a una relación fuerte y para el enfoque realidad actual, corresponde a una reacción escasa o nula.
Análisis psicométrico del cuestionario de memoria prospectiva y retrospectiva
Authors: Cores Evangelina Valeria , Crespi Melina , Eizaguirre María Bárbara , Merino Angeles , Yastremis Cecilia , Vanotti Sandra , Politis Daniel Gustavo
Published: December 2020

Para poder cuantificar e investigar científicamente las quejas mnésicas de los pacientes, se hace necesario contar con un instrumento adaptado y que presente análisis psicométricos adecuados. El objetivo del presente trabajo fue estudiar propiedades psicométricas de una versión argentina del Cuestionario de Memoria Prospectiva y Retrospectiva. Para ello se administró el Cuestionario de Memoria Prospectiva y Retrospectiva de forma individual a 192 participantes sanos con más de 27 puntos en el Mini Mental State Examination. La media de edad fue de 39.67 años (DE = 12.3). La media de escolaridad fue de 14.5 años (DE = 2.72). A un subgrupo de participantes (n = 45) denominado Subgrupo A, también se les administraron pruebas de memoria prospectiva y retrospectiva. El Índice Global del Cuestionario presentó una distribución normal. Según el análisis factorial exploratorio se estableció la extracción de un factor que explicó el 35.19 % de la varianza. El coeficiente α de Cronbach fue de .87. La confiabilidad estimada por el método de la división por mitades fue de .73 y de .84 luego de la corrección con la fórmula de Spearman-Brown. No hubo correlación significativa entre las respuestas del cuestionario y los test de memoria retro y prospectiva en el subgrupo A. Estos resultados permiten concluir que el Cuestionario de Memoria Prospectiva y Retrospectiva presenta adecuados índices de confiabilidad y una estructura de un solo factor. Si bien no se asocia con el rendimiento objetivo en pruebas de memoria, muestra ser apropiado para el registro de las quejas subjetivas de los pacientes en la región de estudio.
Perspectivas investigativas en torno a las parejas sin hijos y su relación con el concepto de “familia”
Authors: Baena Vallejo Germán Arley , García Quintero Clara Stella , Duque Restrepo María Cristina , Velásquez Muñoz Daniel Stivan
Published: December 2020

El objetivo del trabajo que se informa fue mostrar cuáles son las transformaciones que las investigaciones manifiestan sobre la familia e identificar si las parejas sin hijos son consideradas como una tipología emergente de configuración familiar. A partir de una investigación documental al modo de estado del arte, se recolectaron 35 artículos entre 1992 y 2017, que se analizaron desde una perspectiva hermenéutica a partir de los núcleos temáticos “definición y transformación del concepto de ‘familia’” y “perspectivas investigativas en torno a la relación entre parejas sin hijos y familia”. La mayoría concuerda con que la consanguinidad y la procreación ya no son criterios indispensables para conformar una familia, y así, las parejas sin hijos se constituyen como una nueva tipología familiar que se caracteriza por modos más equitativos, consensuales y democráticos de tomar decisiones; todo esto, bajo el contexto social de una profunda transformación de los roles de género desde el siglo XX.
Los estudios bibliométricos en el campo de la psicología iberoamericana
Authors: Gallegos Miguel , Pérez-Acosta Andrés M. , Klappenbach Hugo , López-López Wilson , Bregman Claudia
Published: December 2020

La bibliometría consiste en el tratamiento matemático y estadístico de la información científica y, por ello, se la concibe como la cuantificación de la información bibliográfica susceptible de ser analizada. Más allá de que algunos autores la conciban como una metodología y otros como una técnica, la bibliometría facilita la organización, selección y categorización de la información para un tratamiento cuantitativo y cualitativo. Desde hace más de tres décadas, los estudios bibliométricos han comenzado a proliferar con diferentes usos, orientaciones y aplicaciones en el campo de la psicología iberoamericana. En este trabajo se analizan los estudios bibliométricos en el campo de la psicología iberoamericana recuperados de tres bases de datos: Dialnet (España), Redalyc (México) y SciELO (Brasil). A partir de una muestra de 81 trabajos seleccionados, se realizó una categorización según las diferentes líneas de investigación, los autores más frecuentes, los países de los autores, el rango de años de las publicaciones, el idioma de las publicaciones, el género en la redacción de los trabajos, las revistas que más estudios bibliométricos publicaron y las más analizadas desde la perspectiva bibliométrica. También se analizó el contexto histórico de aparición de los estudios bibliométricos en el campo de la psicología de Iberoamérica. Se concluye que los estudios bibliométricos son un importante recurso metodológico para la evaluación de la disciplina y profesión psicológica, siempre que logren ir más allá de la mera descripción de datos cuantitativos y puedan complementarse con análisis cualitativos, lo que brindaría mayor potencialidad interpretativa y explicativa.
Prevalence of artichoke head rot (Botrytis cinerea Pers.) disease and determining its effect on production in the Western Mediterranean Region of Turkey
Authors: Aydoğdu Mehmet , Kurbetli İlker , Canpolat Sirel
Published: December 2020

Globe artichoke (Cynara scolymus L.) is an herbaceous, edible plant and is cultivated for its immature head (bud) part. In 2016 and 2017, significant damages due to rots on the heads of globe artichoke plants were observed in the farmer fields in the Western Mediterranean Region of Turkey. To determine the cause of the rots, samples were taken from necrotic tissues. Fungal isolates were obtained by the agar-plate method and examined in detail. Based on the morphological and ITS region of the rDNA of the isolates, the causal agent of the disease was determined as Botrytis cinerea Pers. that was previously reported in the USA and Argentina. To our knowledge, this is the first publication that reports the occurrence and prevalence of B. cinerea that causes head rots and economic losses in globe artichoke production in the Western Mediterranean region of Turkey. Although B. cinerea is a common plant pathogenic fungus with a wide range of hosts and little is known Botrytis rot of globe artichoke in Turkey. With this study, the causal agent of the disease was identified, and the status of the disease in globe artichoke growing areas and the influence of the disease on the production were investigated. Surveys were conducted in seven locations (Muratpasa, Kepez, Aksu, Serik, Manavgat, Gazipasa, and Kumluca) in the Western Mediterranean Region in 2016 and 2017. A simple random sampling method was used in the surveys and a total of 95 samples were selected from 79 fields in both years. Mean disease incidence and prevalence were 14.7 and 37.0% in 2016, and while they were 17.5 and 51.1% in 2017, respectively. This study revealed that B. cinerea has a significant impact on globe artichoke production by inducing head rots and accordingly 16.1% annual yield loss in pre-harvest period.
Questions on Optimization of Izomorphic-Holonomic Information-Measuring Systems
Authors:   National Aerospace Agency, Asadov Hikmat , Abdullayeva Sevindj ,   Azerbaijan State University of Oil and Industry, Tarverdiyeva Ulviya ,   Scientific-industrial center «OZONE»
Published: December 2020

Questions on optimization of isomorphic-holonomic information –measuring systems, characterized by in-ternal holomorphic relation are considered. It is shown that isomorphic-holonomic property of information measuring and mechatronic systems make it possible to carry out optimization of them transforming of this task to Lagrange task where the target functional (Lagrange functional) is sum of initial target functional and integral of function of holonomic relation function with limitation imposed on it multiplied by Lagrange multi-plier. It is proved that if searched for function of holonomic relation with imposed limitation condition pro-vides for minimum (maximum) of target functional and if inegrant of initial target functional can be linearized so the function is always exists and is featured as inversed to link function upon which maximum (minimum) can be achieved.
On the Problem of Selecting and Replacing Current Transformers for Relay Protection Devices
Authors:   Platov South-Russian State Polytechnic University (NPI), Kuzhekov Stanislav , Degtyarev Andrey ,   NPF Kvazar, Doni Nikolay ,   EKRA Research and Production Ltd, Shurupov Aleksey ,   EKRA Research and Production Ltd
Published: December 2020

In connection with cases of incorrect operation of high-speed relay protection devices (RPD) in case of short circuits outside their range, the issue of replacing current transformers (CT) of class P with more ad-vanced current converters is relevant. The article shows that the decision to replace existing class P CTs with CTs with a non-magnetic gap should be made taking into account the probability of saturation of the magnetic cores of the latter in a transient short-circuit mode, as well as an increase in their dimensions compared to class P CTs. The issue of using optoelectronic current converters should be resolved after the latter are put into mass production, taking into account the difficulty of integrating the latter with the RPDs implemented using an Electromechanical base. In many cases, the correct functioning of high-speed RPDs without replacing existing CTs of class P can provide the following measures: the use of algorithms that increase the stability of the oper-ation of high-speed RPDs when the CT is saturated; taking into account in the calculations of the settings the rectangular characteristic of the CT magnetization in transient modes and the permissible deceleration of pro-tections under the condition of the dynamic stability of electric power systems; refusal to use CT connection groups (physical sum of currents, delta and star).
Nonsynchronous Connection of High-Power Unit to 400 kV Power Grid
Authors:   Instytut Energetyki w Warszawie, WROBLEWSKA Sylwia
Published: December 2020

One cause of failures in power plants may be traced back to faulty, nonsynchronous synchronisation of a power unit with power grid [1]. This usually results in damage to a generator or a unit transformer. The case of misguided connection of non-excited generator to network has been described in publications [2], [3], [4], this produced very serious damage to the generator
Lightning Protection for Metal Air Vents and Similar Objects Installed on the Roof of Building
Authors:   SEP Oddzial Gdansk, BORYN Henryk
Published: December 2020

Lightning hazard occurring when metal air vents connected with installations inside building are installed on the roof without consulting an expert on lightning protection has been analysed in this paper. The application of accepted designs eliminating this hazard has been described (these designs may be found in rules for formal construction of LPS). In the case of technical project which might significantly impact the safety of operation of constructed systems, thorough expert consultation and harmonisation has been suggested.
Machine Safety in Terms of Electrical Engineering – in the Light of Machinery and the LV Directives
Authors:   Klub Paragraf 34 SBT, TRAJDOS Marek
Published: December 2020

Selected issues related to machine safety in terms of electrical engineering have been discussed in the paper. The author has focused on the relationship between machine directive and low voltage directive, since it proves somewhat difficult to interpret. This is due to the fact that basic requirements for machinery cover all safety issues (including electrical ones), while electrical devices and equipment during design, manufacture and marketing are subjected to low voltage directive (if they are designed for use within certain L V. limits).
How to Believe?
Authors: Lourié Basil
Published: December 2020

Discussion: Butakov, P. A. 2020. “Vo chto i kak nado verit’: otvet sobesednikam [What to Believe and How to Believe It: A Response to My Interlocutors]” [in Russian]. Filosofiya. Zhurnal Vysshey shkoly ekonomiki [Philosophy. Journal of the Higher School of Economics] 4(4), 167-184.
Epistemology and Practice of Believing
Authors: Moiseeva Anna
Published: December 2020

Discussion: Butakov, P. A. 2020. “Vo chto i kak nado verit’: otvet sobesednikam [What to Believe and How to Believe It: A Response to My Interlocutors]” [in Russian]. Filosofiya. Zhurnal Vysshey shkoly ekonomiki [Philosophy. Journal of the Higher School of Economics] 4(4), 167-184.
What to Believe and How to Believe It: A Response to My Interlocutors
Authors: Butakov Pavel
Published: December 2020

Discussion: Butakov, P. A. 2020. “Vo chto i kak nado verit’: otvet sobesednikam [What to Believe and How to Believe It: A Response to My Interlocutors]” [in Russian]. Filosofiya. Zhurnal Vysshey shkoly ekonomiki [Philosophy. Journal of the Higher School of Economics] 4(4), 167-184.
Item test analysis to assess the difficulty index for biostatistics, epidemiology, and demography module of undergraduate medical students of Raipur, Chhattisgarh, India
Authors:   Professor, Department of Community Medicine, Pt. J. N. M. Medical College, Raipur, Chhattisgarh, India, Verma Dr. Nirmal , Shinkar Mr. Swapnil ,   Statistician Cum Lecturer, Department of Community Medicine, Pt. J. N. M. Medical College, Raipur, Chhattisgarh, India, Jain Dr. Kamlesh ,   Professor, Department of Community Medicine, Pt. J. N. M. Medical College, Raipur, Chhattisgarh, India
Published: December 2020

Background: Continuous quality improvement is linked to the use of timely and useful feedbackfrom clients. Patients constitute the hospital’s direct clientele. The overall satisfaction is an importantaspect of the service itself and it is considered to be an important outcome measure for healthservices. Patient care is not considered to be of high quality unless the patient is satisfied.Objective: To assess the level of satisfaction with available health services among inpatientsattending secondary level hospital. Methods: A cross-sectional study was conducted usingpretested, semi-structured questionnaire among 100 inpatients attending Government HospitalChidambaram, Tamil Nadu. Systematic random sampling was used. Results: 96% participants weresatisfied with the attitude of doctors and nurses, 80 % were highly satisfied with the cleanliness ofhospital campus,82 % were highly satisfied with lab services, 83% satisfied with food services. 92%were satisfied with the speedy admission to the ward, 74% satisfied with the ward facilities. 86 %gave a neutral response for other amenities,26 % satisfied with a drinking water facility. Overallsatisfaction among inpatients was a mean of 3.9 out of 5 (78%). Socio-demographic characteristicswere not significantly related to overall satisfaction scores. Conclusion: Patients were generallysatisfied with the hospital facilities. Patients input on various deficiencies needs to be addressed bythe hospital leadership to achieve consumer delight.
Closed loop supply chain mathematical modeling considering lean agile resilient and green strategies
Authors: Mohammadzadeh Masoud , Sobhanallahi Mohammadali , Khamseh Alireza Arshadi
Published: December 2020

The supply chain management is planning, implementation and effective control of supply chain operations considered as a key factor for the competitiveness of the organizations. To make these targets, four management strategies of lean, agile, resilient and green have been separately proposed. Recently, studies have been performed with a consideration of these four strategies simultaneously named LARG (Lean, Agile, Resilient and Green). However, due to the novelty of this subject, the mathematical modeling of SCND (Supply Chain Network Design) has not been addressed in LARG strategy. SCND is one of the most essential parts of supply chain management that strategic decisions of it have heavily effects in both overall and partial applicability of the supply chain. The goal of this paper is to design a closed loop supply chain network considering LARG strategy using multi-objective modeling with uncertain demand. The objective functions are total profit, customer satisfaction and total pollution. The model is formulated to determine which facility sites should be selected (strategic decisions), and find out the optimal number of parts and products in the network (tactical decisions). Finally, a real industrial case study is provided to illustrate the performance and applicability of the LARG strategy in SCND in practice.
Assessing the relative efficiency of commercial banks in the Republic of North Macedonia: DEA window analysis
Authors: Cvetkoska Violeta , Fotova Cikovic Katarina
Published: December 2020

The aim of this paper is to assess the relative efficiency of commercial banks in one developing country, i.e. the Republic of North Macedonia by using the data envelopment analysis (DEA) technique-window analysis. The selection of inputs and outputs plays a key role when applying DEA for assessing the efficiency of decision-making units (DMUs). In the conducted research two inputs and two outputs have been selected. The sample consists of 14 commercial banks and the period that is being observed is an eleven year span from 2007 to 2017. According to the average efficiency score for the whole observed period, the most efficient bank belongs to the group of large banks, which simultaneously shows the highest efficiency. The banking sector in the Republic of North Macedonia, as a whole, showed the highest efficiency in 2007, and the lowest efficiency in 2011.
The influence of integrated information systems on firm financial performance
Authors: Pervan Ivica , Dropulic Ivana
Published: December 2020

This study investigates the influence of integrated information systems (IIS) features on firm financial performance, more precisely return on asset (ROA). Research results, based on data obtained from 83 firms in 2018, confirmed the positive effect between IIS analytical capabilities on ROA, while IIS scope had negative effect on ROA. Estimated regression model revealed that IIS age and IIS implementation quality did not have any effect over firm financial performance. Findings from the study indicated that firms and IIS vendors should be careful in IIS design phase, taking into account that IIS design incorporates appropriate analytical capabilities required by business processes. Also, scope of selected IIS modules should be rational in order to avoid unnecessary IIS investment costs.
Visual Perceptual Skills (non-motor) among Adults in Selangor of Malaysia
Authors:   Optometry & Vision Sciences Programme, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia, Abd Rahman Mohd Harimi
Published: December 2020

Visual perceptual skills are important skills for an adult to carry out their daily activities such as reading, writing and driving, successfully. This study was conducted to determine the visual perceptual skills (non-motor) of a group of adults in Selangor, Malaysia. A total of 120 subjects from Selangor with the age ranging from 20 to 59 years were randomly recruited in this cross-sectional study. This study involved distance and near visual acuity measurements using Snellen chart and Universiti Kebangsaan Malaysia (UKM) near vision chart, cognitive screening tests using the Mini Mental State Examination questionnaire (MMSE) as well as visual perceptual skills assessment (non-motor) using the Test of Visual Perceptual Skills (Non-Motor)- Revised (TVPS-R). The mean age of the subjects was 39.41+11.81 years old. Results showed that the mean standard scored obtained for Visual Discrimination (VD), Visual Memory (VM), Visual-Spatial Relationships (VSR), Visual Form Constancy (VFC), Visual Sequential Memory (VSM), Visual Figure-Ground (VFG) and Visual Closure (VC) subtests were 14.12+1.10, 13.42+1.58, 14.53+1.26, 12.47+1.03, 12.35+2.26, 13.67+1.64 and 13.73+2.23, respectively. Analysis of ANOVA shows that the VD, VM, and VSM scores are influenced by educational level (p<0.05). Pearson correlation showed a significant negative correlation between all the sub-tests of TVPS-R scores with age variation (p<0.05) except the VFC. Linear regression showed significant negative relationship between VD, VM, VSR and VSM with age. This research provided normative data of TVPS-R test on Malaysian adults for future reference and study.
Knowledge and Preventive Behaviour among Pregnant Women with Latent Toxoplasmosis in Malaysia
Authors:   Department of Parasitology & Medical Entomology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, 56000 Cheras, Kuala Lumpur, Malaysia., Osman Emelia
Published: December 2020

Latent toxoplasmosis could induce various hormonal and behavioural perturbations in infected hosts. We aimed to study the latent seroprevalence of Toxoplasma gondii (T. gondii) and the relationship between infection, knowledge and behaviour among 400 pregnant mothers. Plasma samples were tested for the presence of T. gondii IgG antibodies while a structured questionnaire was used to record respondents’ socio-demographic characteristics, general information and knowledge on plausible risk factors, symptoms, timing of infection, and preventive knowledge and behaviour regarding toxoplasmosis. The seroprevalence of latent toxoplasmosis among respondents was at 31.8%. This study indicated that 69.5% of them had poor knowledge of toxoplasmosis but most of them (99.8%) practised preventive behaviours. Multiple logistic regression analysis showed that pregnant women with low education levels (aOR: 1.91, 95% CI 1.18, 3.10; p = 0.008) and past medical history (aOR: 2.32, 95% CI 1.32, 4.06; p = 0.003) were both twice as likely to have anti-T. gondii IgG seropositivity. Besides, women who were unsure regarding the transmission mode of the disease via blood transfusion were four times more likely (aOR: 3.93, 95% CI 1.54, 10.01; p = 0.004) to have chronic toxoplasmosis seroprevalence. Women who were unsure regarding the necessities of avoiding stray cats had aOR of 0.42 (95% CI 0.24, 0.71, p = 0.001) for chronic toxoplasmosis seroprevalence. Translating the knowledge on toxoplasmosis into the practice of preventive behaviour via a health education programme is crucial in reducing the risk of disease transmission especially among pregnant women.
Impact of Epiphora on Modified Ocular Surface Disease Index Questionnaire
Authors:   Hitit University Corum Education and Training Hospital, 19000, Corum, Turkey, Eylül Ercan Zeynep
Published: December 2020

Epiphora (excessive tear production) is a major ocular disturbance, especially among middle aged and older patients. It can be due to lacrimal drainage malfunction of any kind. The aim of this study was to evaluate the effects of epiphora with good passage on lacrimal irrigation on a modified Ocular Surface Disease Index (OSDI) questionnaire. A total of 101 patients (53 males/ 48 females) were included in the study. The modified OSDI questionnaire had 11 items concerning ocular symptoms that affects daily activities. The relationships between the questionnaire score for each question and the clinical features included age, gender and previous cataract surgery. The most affected activities according to modified OSDI were watching television, windy conditions and cold weather (average means of 3.36 + 0.82, 3.42 +±0.86 and 3.40 +±0.88, respectively). Epiphora was found to have a statistically significant effect on daily life, all except with regard to interpersonal relations (p=0.493) with increasing age. Women were found to be experiencing more eye grittiness (p=0.0001), getting more affected during reading (p=0.027), at hot/dry climates (p=0.0001) and believed epiphora has an important impact on interpersonal relations and general happiness (p<0.0001). Pseudophakic patients also showed statistically significant increase of discomfort in daily life questions in 7 of the 11 questions (p<0.0001). This study showed the subjective epiphora related symptoms impact on a modified OSDI. This questionnaire was easy to manage and quick to complete while showing similar results to those that were specifically designed for epiphora with nasolacrimal obstruction. We believe that the results could help to improve overall therapeutic management of patients with epiphora
Development of Knowledge, Attitudes, and Practices (KAP) Towards COVID-19 Pandemic in Malaysia
Authors:   Department of Psychological Medicine, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia, Chong Guan Ng
Published: December 2020

During this COVID-19 pandemic, massive unverified information has flooded the social media platforms, causing heightened levels of anxiety and depressive symptoms among public. This study aimed to investigate the relationship between the COVID-19 related knowledge, attitude, and practice (KAP) and its psychological impact, such as anxiety and depressive symptoms in Malaysia population. A crosssectional online survey was conducted from 8th to 22nd April 2020, involving 227 respondents. The set of questionnaire included sociodemographic characteristics, the KAP questionnaire – 11 items on knowledge (K1-K11), 3 items on attitude (A1- A3), 4 items on practice (P1-P4), together with Patient Health Questionnaire (PHQ-9) and Generalised Anxiety Disorder (GAD-7) Scale. To evaluate the data, descriptive analysis, Chi-square test and item response theory analysis were implemented. The percentage of respondents who answered the true statements items from Knowledge component (K1-K3) correctly was almost 100%. However, that of items testing on COVID-19 myths (K4-K11) ranged from 38.8% to 95.2%. The only item from Attitude component which had less than 95% being answered correctly was A1 (78.9%), regarding face masks usage. From the Practice component, over 80% of respondents identified that they used social media to obtain updates on COVID-19 all the time. This is alarming as most of the information circulating on social media have not been verified by relevant authorities, which might lead to, and continuously reinforce anxiety-inducing myths. This study showed that lower overall KAP scores, particularly for Knowledge component items, are related to higher anxiety levels and more depressive symptoms.
Assessment of the actual shape of the hot-rolled strip cross-section contour. Part 2. Profile Classifier
Authors:   Lipetsk State Technical University (Lipetsk, Russia), Belskiy S. M. , Shkarin A. N. ,   Lipetsk State Technical University (Lipetsk, Russia), Pimenov V. A. ,   Novolipetsk Steel – NLMK (Lipetsk, Russia)
Published: December 2020

The geometric parameters describing the features of the crosssectional profile of a hot-rolled strips do not give a complete picture of the flatness acquired by the cold-rolled strips rolled from these strips. An additional analysis, the results of which are presented in Message 1, showed that there are four characteristic classes of cross-sectional profiles of hot rolled strips that have a significant effect on the shape of the strips during cold rolling, three of which negatively affect the flatness of the cold rolled strips. The cross-sectional profiles of hot-rolled strips with a concave middle part and / or marginal thickenings lead to the appearance of edge waviness, peak-like cross-sectional profiles cause central warping. Therefore, the actual task is to determine the factual shape of cross-sectional profile. 6th order polynomials were used to digitalize and parameterize hot-rolled profile. As a result, we developed analytic function of the transverse profile, which keeps important information about its near-edge areas and features in the middle part. To assign a specific crosssectional profile of a hot-rolled strip to one of four characteristic classes of cross-sections, mathematical software was developed, called a classifier, and implemented with the programming environment R. To classify the profiles of the hot-rolled cross-section according to characteristic classes, a linear discriminant method was used as a machine learning method analysis. The result is an adequate mathematical model for recognizing the shape of the cross-sectional profile. The study was carried out with the financial support of the Russian Foundation for Basic Research within the framework of scientific project No. 19-38-90257.
The structure formation mechanism in wet coal fines briquetting with an active binder
Authors:   State Marine Technical University of Saint-Petersburg (Saint-Petersburg, Russia), Nifontov Yu. A.
Published: December 2020

This paper presents the results of studies of the structure formation mechanism for briquettes made from coal fines (sludge, coal dust, and fines), with the use of powdered technical lignosulfonate (100 % Na base) as the binder. It has been established that, when briquetting fine coal fines with active finely-dispersed binders in an air-dry state, the structure formation mechanism of the briquette does not fully align with any of the existing hypotheses. As a result of the research, a theoretical substantiation is proposed for the hypothesis of wet coal sludge briquetting with the use of active finelydispersed binders in an air-dry state. It has been shown that the walls of capillaries and pores in the central part of the briquette experience precipitation from the fluid systems, dissolved by internal moisture, and of coarse particles and a certain amount of the binder entrained in the fluid. Further, a lean fluid advances to the surface of the briquette, consisting mainly of moisture and an excess amount of the active binder, dissolved in it. In the near-surface compacted area of the briquette, the binder is adsorbed on coal particles and the moisture released in the process of thermal destruction and adsorption evaporates. The practical use of the concepts obtained allows controlling the structure formation processes to improve strength without increasing the binder content through layer-by-layer reinforcement of the briquette mass with a closed surface, which significantly improves the process results.
Application of SWOT analysis to select pyrometallurgical techniques for copper-nickel sulphide concentrates. Part 1. Selecting pyrometallurgical techniques for copper-nickel sulphide concentrates with the help of SWOT analysis
Authors:   Gipronikel Institute LLC, Saint Petersburg, Russia, Parkhomenko I. Yu. , Tsymbulov L. B. ,   Gipronikel Institute LLC, Saint Petersburg, Russia, Zlotnikov K. P. ,   Chernogorskaya Mining Company LLC, Moscow, Russia, Sidorova E. Yu. ,   National University of Science and Technology MISiS, Moscow, Russia
Published: December 2020

This paper looks at substantiating the choice of a pyrometallurgical technique for processing of copper-nickel sulphide concentrates with a high concentration of platinum group metals. For this, it is proposed to use a modified SWOT analysis, which was also tested. The paper considers a classical SWOT analysis and its stages and gives examples of its application in different industries. Constraints have been identified for the pyrometallurgical processes recommended for analysis. Internal and external factors have been defined for the recommended pyrometallurgical processes. Each of the factors has been assigned relevance and impact coefficients with regard to an appropriate process. The obtained results have been included in an integrated estimator matrix. The obtained results have been evaluated on the basis of such indicators as overall, internal and external SWOT coefficients expressed as figures. The resultant data served as the basis for recommending the relatively most effective processes that would enable to achieve the project goals. This study can be used to issue recommendations on choosing the most advanced pyrometallurgical techniques for copper-nickel sulphide concentrates that will help reduce the number of processes involved and conduct a further detailed feasibility study. The given indicators may change considerably depending on the factor linked to the production hazards. That’s why a stability calculation was performed additionally for the overall SWOT estimates in relation to this criterion. The change dynamics of the overall coefficients is reflected in the graphs. Depending on the selected level of production hazards some processes may swap on the efficiency scale. The authors offer their recommendations on optimum processes that will enable to achieve the project goals considering the above mentioned factor.
Non-destructive ultrasonic method of testing the strength of backfill concrete at deep Talnakh mines
Authors:   Gipronikel Institute LLC, Saint Petersburg, Russia, Trofimov A. V. , Rumyantsev A. E. ,   Gipronikel Institute LLC, Saint Petersburg, Russia, Gospodarikov A. P. ,   Saint Petersburg Mining University, Saint Petersburg, Russia, Kirkin A. P. ,   Gipronikel Institute LLC, Saint Petersburg, Russia,   Saint Petersburg Mining University, Saint Petersburg, Russia
Published: December 2020

In underground mining with backfilling of mined-out areas, it is necessary to analyze the filling mass quality. Since coring and testing would make a complex process, the method of express analysis comes in handy. As the mechanical methods of express quality analysis are not very accurate, the best option would be to use an acoustic method. But before the latter can be used, it is necessary to conduct a series of laboratory tests in order to under stand the empirical correlation between strength and acoustic pro perties. This paper describes the results of laboratory tests that were carried out for samples of backfill concrete after 7, 28, 45, 70, 90 days of curing to test their strength and acoustic properties. A correlation has been found between the uniaxial compressive strength of the fill and the ultrasonic wave propagation rates. Some field measurements have been taken to determine the propagation rates of longitudinal and transverse waves in the filling mass. Calibration curves have been built for both longitudinal and transverse waves. It was established that for the filling mass that hasn’t cured for 90 days it is the propagation rate of transverse waves that correlates most accurately with the strength; whereas for the filling mass that is older than 90 days it is the propagation rate of longitudinal waves.
Looking at the changing composition of blister copper obtained through continuous converting
Authors:   Gipronikel Institute LLC, Saint Petersburg, Russia, Ozerov S. S. , Tsymbulov L. B. ,   Gipronikel Institute LLC, Saint Petersburg, Russia, Eroshevich S. Yu. ,   PJSC MMC Norilsk Nickel, Moscow, Russia, Gritskikh V. B. ,   PJSC MMC Norilsk Nickel, Moscow, Russia
Published: December 2020

Conventional converting of nickel-bearing copper mattes in horizontal Peirce – Smith converters does not conform with the current environmental regulations. A general global trend includes a transition from conventional batch converting to a continuous converting process producing running slags. The main purpose of the continuous matte converting process is to obtain commercial blister copper that would not require oxidation during further anode refining. To achieve this, rational process parameters should be strictly maintained. The existing method of monitoring the Vanyukov furnace process that is based on the product analysis is a prerequisite but cannot ensure real-time process control. The blister copper obtained through continuous converting differs from the one obtained through the conventional technology in terms of oxygen and nickel concentrations. That’s why its composition should be constantly monitored. The authors looked at how the composition of blister copper obtained through continuous converting of matte tends to change. Samples of blister copper of different compositions were synthesized that are typical of the start-up mode. When the process temperature rises, the required product characteristics can only be obtained if the oxidation potential is higher. This results in a higher concentration of oxygen in blister copper. Mathematical dependencies were derived between the concentrations of nickel and sulphur in the product at various temperatures and the concentration of oxygen. A technique is proposed that enables a real-time monitoring of impurities in blister copper.
Production of raw copper through continuous converting of copper-nickel sulphide materials
Authors:   Gipronikel Institute LLC, Saint Petersburg, Russia, Ozerov S. S. , Pakhomov R. A. ,   Gipronikel Institute LLC, Saint Petersburg, Russia, Tozik V. M. ,   PJSC MMC Norilsk Nickel, Moscow, Russia, Tsemekhman L. Sh.
Published: December 2020

The conventional technology of converting copper mattes in horizontal converters has its drawbacks and fails to conform with the current environmental norms and regulations applicable to metallurgical processes. Therefore, it should be replaced with an environmentally sustainable technology. This paper considers the results of a lab and pilot scale study that looked at converting nickel-bearing copper material into raw copper and running nickelbearing slag. It is demonstrated that the continuous converting process can be stable in both three-layer mode (i. e. slag – white matte – copper) and two-layer mode (i. e. slag – copper). With the help of scanning electron microscopy and electron microprobe analysis, it was established that most of copper, nickel and cobalt get wasted in a soluble form. Choice of fluxes produces a significant effect of the process performance. Fluxes were added to maintain the total concentration of SiO2 and CaO in the slag at 32%. At the same time, varying SiO2/CaO ratios were used depending on the operating mode — from pure Fe – Si slag to pure Fe – Ca slag. It is noted that a rising SiO2/CaO ratio leads to a higher recovery of nickel into slag. A pure Fe – Si slag mode is associated with foaming. The results of the lab study were verified through test heats carried out in a pilot Vanyukov furnace. The obtained raw copper has the following composition, wt %: 3.6–4.2 Ni; 0.6–1.2 S; 0.006–0.06 Fe; and it needs to be final converted for better refining.
Nanoionics - the Developing Informative System. Part. 2. From the First Works to the Current State of Nanoionics Abroad
Authors:   Institute of Microelectronics Technology and High Purity Materials RAS, Chernogolovka, Moscow Region, 142432, Russian Federation, Despotuli A.L. , Andreeva A.V. ,   Institute of Microelectronics Technology and High Purity Materials RAS, Chernogolovka, Moscow Region, 142432, Russian Federation
Published: December 2020

A critical review presents the stages of formation, development, and current state of nanoionics in Russia and the world. Nanoionics is considered as a developing information system; its history is analyzed in terms of dynamic information theory and in the frame of strategic innovation management. The second part of the review presents in the brief form a panoramic view of nanoionics development abroad. An extended definition of the scientific direction of "nanoionics" is given. Since the foreign literature on the subject of the review is extensive, the results of works in which the term "nanoionics" appears in the title, annotations, and keywords are mainly considered. More detailed analysis is given of the works that have seriously influenced the development of nanoionics and will determine its future. The development of nanoionic devices with memory function, Li-ion batteries, and fuel cells is considered. The important role of the creation of stable interface boundaries in nanoionic devices (on which electrochemical reactions take place) is emphasized. New areas of research such as nanoarchitectonics and iontronics are critically analyzed. On a comparative basis, a scheme for the correct introduction of the new scientific term is proposed.
The Notch Filter on Surface Acoustic Wave on Base of Single Phase Unidirectional Transducers
Authors:   Saint-Petersburg Electrotechnical University LETT, 197376, St. Petersburg, Russian Federation, Koigerov A.S. , Andreychev S.S. ,   LLC RF Solution, St. Petersburg,  198095, Russian Federation
Published: December 2020

High requirements on the electrical parameters of the filters are made in radio engineering systems. For bandpass filters, these requirements apply to the squareness coefficient of the amplitude frequency response and rejection. Therefore, the notch filter can be used as a complement to bandpass filters, since it serves to suppress signals in a certain frequency range. Notch filters on surface acoustic waves are not widely used, but they have a number of interesting features and advantages over types of filters that work on other principles. The purpose of the development is to produce a notch filter on surface acoustic waves at 40.05 MHz with 40 dB suppression, a bandstop at the level of -3 dB at least 135 kHz (relative value - 0.34 %), a bandstop at the level of -40 dB at least 35 kHz (relative value - 0.0875 %). Results: a brief classification of notch filters is given. Various variants of passive notch filters are considered. Based on the method of coupling of modes and the finite element method, key elements on surface acoustic waves were calculated and manufactured for a notch filter with the required parameters on a substrate of a 36°YX Quartz piezoelectric material. The key element is a unidirectional transducer of DART type. The scheme is based on a bridge scheme with additional passive tuning elements. It is shown that in order to implement this filter, it is necessary not only to select all the topology parameters of individual key elements included in the filter very precisely, but also to perform precise configuration and selection of passive LC-elements. These calculations are confirmed by the results of experiments.
Comparative Analysis of the Results of Coronavirus Imaging on PEM and SPM
Authors:   Ready Solutions LLC, Chegem, Shugunov L.Zh. , Shugunov T.L. ,   Analytical Center, Moscow
Published: December 2020

This paper presents the results of research and comparison of the image of the coronavirus obtained on PEM with the results of processing using a scanning probe microscope in AFM mode. It is known that in this size range, fairly accurate results can be obtained on SPM devices, followed by mathematical processing, which is of scientific and practical interest, which is also important for medicine. In addition, the study of processes-objects using various independent methods allows you to get more reliable results, in this paper, to obtain more reliable results of the values of the characteristics-parameters of the coronavirus. The results of a test problem study are also given to illustrate the method's performance.
O śmianiu się z czegoś i z kogoś, czyli o przedmiotowym i podmiotowym znaczeniu czasownika śmiać się
Authors: Banasiak Dagmara
Published: December 2020

The aim of this paper is to discuss the main syntactic and semantic features of the Polish predicate śmiać się (to laugh) within the theory of Semantic Syntax (Karolak 1984, 2002). It forms two, only seemingly similar, predicate-argument structures containing a prepositional phrase connected with the Polish preposition z + Gen. (at): 1) [ktoś] śmieje się z [kogoś ABSTR / czegoś ABSTR] ([somebody] laughs at [somebody ABSTR / something ABSTR]) and 2) [ktoś] śmieje się [z kogoś / czyjegoś], że_ ([somebody] laughs at [somebody / something what belongs to somebody] + SENT). The analysis shows they are different in terms of status and semantic roles of their arguments, axiological markedness, objective or subjective reference of the humour incorporated in the act of laughter. Also, they denote different semantic scenarios: the first means a vocal and facial reaction to ludic humour, the second constitutes a complex act of speech in which satirical, verbal or non-verbal humour is used as a pretext to communicate the agent’s disapproving judgment of the patient, or an antipathetic attitude towards it.
Proces numeralizacji rzeczowników w gwarach polskich
Authors: Kozioł Joanna
Published: December 2020

This article concerns nouns referring to specific objects or phenomena in their original meaning and, combined with other nouns, may mean a quantity indefinitely large or small. The result of gradual lexicalization in the numeral function are formal changes. The changes of grammatical categories cause the transfer of units from one class to another. The author of this work presents the process of numeralization of nouns occurring in Polish dialects, against the background of general Polish, basing on materials gathered in the files of “Dictionary of Polish Dialects” by the Institute of Polish Language at the Polish Academy of Sciences in Krakow.
Terminologia związana z ekspresywnością języka i leksyką ekspresywną w ujęciu historycznym. Prolegomena
Authors: Mitrenga Barbara
Published: December 2020

The main aim of this paper is an attempt to describe the Polish terminology related to language expressiveness and expressive lexis on base of selected didactic works (historical grammars and handbooks) and linguistic dissertation published in the last fifty years. Author of this article discussed selected terms, e.g. expressiveness, expression, expressive sign, expressive words and typologies of expressive words by Teresa Skubalanka, Stanisław Grabias, Halina Zgółkowa and Artur Rejter. It is a theoretical paper which can be a prolegomena to further research on question devoted to language expressiveness and expressive lexis in historical approach.
Glosy jako podstawa polskich badań historycznojęzykowych
Authors: Leńczuk Mariusz
Published: December 2020

Polish glosses contained in 15th- century manuscripts are one of the basic elements of Polish historicallinguistic research. They are the largest and most diverse group of medieval monuments of the Polish language. Although they reflect almost all areas of life of the 15th-century inhabitants of Poland, they remain separated from the mainstream of historical and linguistic research. The author summarizes the history of research on Polish glosses and refers to the discussion on the term ‘gloss’, tools for describing glosses, and source research.