bluuebunny/crossref_metadata_2025 huggingface dataset:
Розробка та характеризація керамічних вставок в металеві резонатори ЕПР спектрометрів для підвищення їх чутливості
Authors: Lemishko S.V. , Vorona I.P. , Golovina I.S. , Yukhymchuk V.O. , Okulov S.M. , Nosenko V.V. , Solopan S.O. , Belous A.G.
Published: July 2021

На основi керамiки легованого тетратитанату барiю (BaTi4O9 + 8,5% ZnO) з дiелектричною сталою e = 36 i низькими дiелектричними втратами (tg б ≈ 1,887 · 10−4) у дiапазонi частот 9–10 ГГц розроблено дiелектричнi вставки цилiндричної форми та певних розмiрiв в стандартний металевий ЕПР спектрометр. Встановлено, що їх використання дозволяє пiдсилити сигнал ЕПР за рахунок перерозподiлу НВЧ поля всерединi стандартного прямокутного ТЕ102 резонатора як у випадку зразкiв, що не насичуються, так i зразкiв, для яких характерне насичення сигналiв ЕПР. Зокрема, для тестових зразкiв MnCl2, що не насичуються, отримано пiдсилення в 9 разiв, а для тестових зразкiв, що насичуються (MgO : Mn), приблизно в 1,5 рази.
Molecular-Field Approximation in the Theory of Ferromagnetic Phase Transition in Diluted Magnetic Semiconductors
Authors: Semenov Yu.G. , Ryabchenko S.M.
Published: July 2021

In this pedagogical paper, the comparative analysis of two common approaches describing the ferromagnetic phase transition in diluted magnetic semiconductors (DMS) is expounded in terms of the Weiss field approximation. Assuming a finite spin polarization of the magnetic ions, the treatment of carrier-ion exchange interaction in the first order evokes a homogeneous Weiss molecular field that polarizes the spins of free carriers. In turn, this spin polarization of the free carriers exerts the effective field that may stabilize the DMS spin polarization belowa critical temperature TC. The treatment of such self-consistent spontaneous DMS magnetization can be done in terms of the spin-spin interaction independent of the inter-ion distance and the infinitesimal in thermodynamic limit. On the other hand, by additionally accounting for the second-order effects of the carrier-ion exchange interaction, we can treat a Weiss field in terms of the Ruderman–Kittel–Kasuya–Yosida indirect spin-spin interaction, which oscillates and does not disappear at finite inter-ion distances in the case of a finite concentration of carriers. These both approaches result in the same Curie temperature TC provided a non-correlated homogeneous random distribution of the localized spin moments over the sample volume. We discuss the origin of such coincidence and show when this is not a case in other more realistic models of the conducting DMSs.
La tercera edad en Latinoamérica y México. Un largo transitar entre la ciudadanía y las subciudadanías
Authors: Russo Juan , Klein Alejandro
Published: July 2021

El objetivo de este artículo es elaborar una  reflexión, desde una perspectiva analítica y crítica donde, consultando fuentes originales, se intenta situar aspectos paradójicos que detectan procesos de ciudadanía emergente en los adultos mayores de América Latina, los que sin embargo se siguen situando en contextos de alta vulnerabilidad social e insertos en procesos de sub-ciudadanía. La metodología se centra en una revisión bibliográfica del tema. El marco teórico surge de la teoría política, así como se utilizan referentes demográficos y otros provenientes de la teoría social. Como conclusiones se señala que por el momento y paradojalmente coexisten dos situaciones antagónicas: por un lado. el tránsito a nítidos procesos de ciudadanía, y por otro, el mantenimiento de situaciones de alta vulnerabilidad social, familiar y social, que señalan por el contrario procesos de sub-ciudadanía; es decir, una tercera edad latinoamericana en franco proceso de vaivén entre procesos de empoderamiento novedosos y la multiplicación de situaciones de desamparo preocupantes.
Movilidad humana: una revisión teórica aplicable de los flujos migratorios en España
Authors: Benlloch-Doménech Cristina , Barbé-Villarubia María José
Published: July 2021

El texto tiene el objetivo de realizar una revisión teórica aplicable entorno a las migraciones en el contexto particular español. Se ha realizado una revisión bibliográfica aplicable disponible en torno al tema, con el fin de ofrecer una recopilación y selección de la información disponible a este respecto partiendo de la dicotomía que haría en su momento López de Lera (1995), los que “vienen a descansar y los que vienen a trabajar”. Es importante porque el desarrollo teórico de sendas perspectivas de la migración es divergente. Este es el aporte del texto, realizar un recorrido por los dos caminos migratorios y delimitar las principales corrientes.
Prevalence and morphometric characteristics of the anterolateral ligament of the knee in a sample of Colombian human cadaversand morphometric characteristics of the anterolateral ligament of the knee in a sample of Colombian human cadavers
Authors: Cruz-Buitrago Daniela , Quijano-Blanco Yobany
Published: July 2021

Introduction: Even though the anatomy of the knee and its ligaments are well characterized in the literature, several studies have found new structures associated with this joint, such as the anterolateral ligament (ALL) of the knee. The prevalence of this ligament varies significantly across the globe, and studies addressing this topic in the Colombian population are scarce.
Objective: To determine the prevalence of the ALL and its morphometric characteristics in a sample of Colombian human cadavers.
Materials and methods: Cross-sectional study in which the knee joints of 15 human cadavers were dissected and analyzed. In order to preserve the integrity of anatomical structures such as ligaments and tendons, specimens should not have undergone previous dissections, so only 29 knees were included for analysis. The presence of the ligament was confirmed, and the proximal and distal insertion site, as well as its length and width, were established through dissection.
Results: The prevalence of ALL was 24.13%, as it was identified in 7 of the 29 dissected knees (4 left and 3 right knees). The average length and width of the ALLs found were 37.5mm (range: 24-52.4mm) and 3.9mm (range: 2.6-6mm), respectively.
Conclusions: This study allowed confirming the presence of the ALL in the Colombian population, although with a lower prevalence than that described in countries such as France, India, China, USA, and Brazil. In turn, its morphometric characteristics were similar to those reported worldwide, since the average length and width found here are consistent with those described in the literature.
Herlyn-Werner-Wunderlich syndrome: Case report
Authors: López-Alza Laura Catalina , Mesa-Espinel Mario Santiago
Published: July 2021

Introduction: Herlyn-Werner-Wunderlich (HWW) syndrome is a rare congenital malformation of the urogenital tract characterized by the triad of uterine didelphys, obstructed hemivagina, and ipsilateral renal agenesis, which is usually diagnosed after menarche. It is treated by resecting the vaginal septum and draining the obstructed hemivagina and has a favorable postoperative prognosis.
Case presentation: This is the case of 22-year-old woman with a 9-year history of dysmenorrhea, pelvic pain, and irregular menstrual cycles that started after she had her first menstruation, who visited the gynecology service of a secondary care hospital in Sogamoso, Boyacá (Colombia). The patient reported having visited multiple specialists and being treated with vitamin E, metformin, and contraceptives, without experiencing an improvement of symptoms and signs. After being assessed, and taking into account ultrasound and MRI findings, she was diagnosed with HWW syndrome. She underwent a colpotomy plus resection of right paracervical mass of approximately 60x60mm and vaginal septum, achieving complete resolution of symptoms. Finally, 10 months after the surgery, she reported being pregnant without complications.
Conclusion: HWW syndrome is a rare malformation that should be considered as a differential diagnosis in women of any age with paramesonephric duct anomalies, pelvic pain, dysmenorrhea, and presence of masses in the genital tract, since its early diagnosis and timely treatment considerably improve the quality of life of these patients by reducing the severity of symptoms, decreasing the incidence of complications, and improving obstetric prognosis.
Leadership among the medical staff
Authors: Javier-Silva Luz Alexandra , Rosario-Pacahuala Emilio Augusto
Published: July 2021

Dear Editor:Nowadays, and specifically in the health sector, leadership development is critical because it enables physicians to articulate their capacities in order to improve both the administration of the services delivered to the population and the management of personnel working in hospital centers.
Wilms or non-Wilms tumors? Imaging features of renal tumors in pediatrics
Authors: Royero-Arias Mónica Rocío , Salazar-Díaz Luis Carlos , Moreno-Gómez Luz Ángela
Published: July 2021

Introduction: Identifying the imaging features of renal tumors in pediatric population allows reaching more accurate diagnoses and implementing more appropriate treatments.
Objective: To describe the imaging findings of renal tumors in children and to assess the association between imaging findings and histological diagnosis of Wilms tumors versus Non-Wilms tumors, and between imaging features and intraoperative rupture of Wilms tumors, as well as the level of agreement between radiological and histological diagnosis (Wilms vs. Non-Wilms tumor).
Materials and methods: Cross-sectional study conducted in 47 children with a pathological diagnosis of kidney tumor and treated between 2012 and 2018 in a pediatric hospital in Bogotá D.C., Colombia. The patients’ medical records, as well as their ultrasound, tomography and magnetic resonance studies were reviewed. Two univariate logistic regression analyses were performed to assess the association between imaging findings and histopathological diagnosis and between imaging features and intraoperative rupture of Wilms tumors, calculating the respective Odds Ratio (OR) with a 95% confidence interval. In addition, the level of agreement between radiological and histological diagnosis was determined using the Cohen’s kappa coefficient.
Results: A significant association was found between histological diagnosis of Wilms tumor and the presence of necrosis, tumor enhancement, pseudocapsule, rupture signs, tumor volume and tumor size (OR: 21.6, 15.17, 14.57, 8.21, 7.93, and 4.37, respectively; p<0.05). An association between having Wilms tumors and a lower frequency of metastases was also found (OR: 0.19; p<0.05). The kappa coefficient between radiological diagnosis of Wilms/non-Wilms tumors and histological diagnosis was 0.78 (CI95%: 0.59-0.96; p<0.05). Additionally, Wilms tumors volume was significantly associated with the occurrence of rupture (OR: 3.08; p<0.05).
Conclusions: There are imaging findings such as necrosis, tumor enhancement and tumor volume that can help predict the histological diagnosis of Wilms tumors, as well as perioperative rupture. In addition, a moderate to very good concordance between radiological diagnosis of Wilms/non-Wilms tumors and histological findings was found.
Costa Rica sin Fronteras #23
Authors: Aragón Vargas Luis Fernando
Published: July 2021

En esta sección se publican los resúmenes de artículos que han sido publicados por investigadoras/es de universidades costarricenses en otras revistas en el mundo, con su debida referencia al trabajo original, y con una breve explicación de dónde se realizó la investigación. Los artículos originales han sido publicados en otros idiomas; las revistas tienen consejo editorial y manejan un proceso de revisión por pares.

 

Los resúmenes corresponden a estudios relacionados con las ciencias del ejercicio y la salud, que se conforman a los criterios generales de la revista, esto es, se trata de “... estudios experimentales o que hagan recomendaciones concretas para solucionar problemas o preguntas relevantes (...) trabajos originales o de meta-análisis.” Solicitamos a quienes hayan publicado este tipo de trabajos en otros idiomas que no los hagan saber, para incluir sus resúmenes en futuras entregas de esta sección.
Fuentes de conocimiento de los entrenadores: estudio de caso de las selecciones brasileñas de balonmano masculino
Authors: Mendes José Carlos , Milistetd Michel , Ibáñez Sergio José , Vieira do Nascimento Juarez
Published: July 2021

El estudio ha identificado las fuentes de conocimiento más valorizadas por los entrenadores y ayudantes de campo de las selecciones de balonmano masculino de Brasil en las categorías juvenil (U19), júnior (U21) y adulta. La investigación trata de un estudio de caso realizado con tres entrenadores y tres entrenadores asistentes de las selecciones masculinas de balonmano de Brasil. Se recolectaron los datos por medio del cuestionario de Perfil de Formación del Entrenador. Los datos fueron analizados por medio de estadística descriptiva (mediana) e inferencial (U de Mann Whitney y Kruskal Wallis) con nivel de significancia de p ≤ .05. Los resultados indicaron que, tanto los entrenadores como los ayudantes de campo de las selecciones, asignaban mayor valorización a las fuentes de conocimiento procedentes de “experiencia profesional” y de “formación académica”. Además, se observó que las fuentes de conocimiento procedentes de “experiencia profesional” fueron más valorizadas por los integrantes de las comisiones técnicas de las selecciones U19 y adulta, mientras que los miembros de la comisión técnica de la selección U21 valorizaban más las fuentes de conocimiento procedentes de “formación académica”. No obstante, no se encontraron diferencias significativas en los resultados entre entrenadores y entrenadores asistentes, así como entre las comisiones técnicas de las selecciones U19, U21 y adulta. La actuación profesional de los entrenadores y asistentes de campo de las selecciones brasileñas masculinas de las categorías U19, U21 y adulta de balonmano y la construcción del proceso de entrenamiento del modelo de juego propuesto para las selecciones se estructuraron a partir de las fuentes de conocimientos procedentes de su “experiencia profesional” y la “formación académica”.
Who is innovating and how in the education sector? Combining subject and object approaches
Authors: Halász Gábor , Fazekas Ágnes
Published: July 2021

The choice between the subject and the object approaches and their combination is one of the challenges designers of innovation surveys face. Although it is encouraged by the Oslo manual, the combined use of these two approaches is rare. The paper presents a large scale education sector innovation survey using these approaches simultaneously in a matched employer/employee data collection with a special focus on small innovations initiated at grassroots level.
Az IGHV-mutációs státusz vizsgálata a Magyar Hematológiai és Transzfuziológiai Társaság Molekuláris Diagnosztika Munkacsoportjának laboratóriumaiban
Authors: Nagy Ákos , Andrikovics Hajnalka , Kajtár Béla , Ujfalusi Anikó , László Zsuzsanna , Kotmayer Lili , Csabán Dóra , Bors András , Makkos-Weisz Anett , Kapitány Emese , Sulák Adrienn , Bödör Csaba
Published: July 2021

Összefoglaló. A Magyar Hematológiai és Transzfuziológiai Társaság
(MHTT) Onkohematológiai Molekuláris Diagnosztikai Munkacsoportja öt egyetemi és
országos onkohematológiai centrumban 2018 és 2020 között 2261 krónikus
limfocitás leukémiában (CLL) szenvedő beteg immunglobulin nehézláncgénjének
(IGHV-) vizsgálatát végezte el a rutindiagnosztika keretében, jelen írásunkban
ezen eredményeket foglaljuk össze. A vizsgált minták 53,5%-a bizonyult nem
mutált immunglobulin nehézlánccal rendelkező CLL-nek, mutált immunglobulint az
esetek 41,6%-ában detektáltunk. Az átrendeződött immunglobulin-szekvenciákat
11%-ban tudtuk valamelyik CLL alcsoportba („subset”) besorolni, melyek közül a
CLL#2, a CLL#1, a CLL#6, CLL#4, CLL#3 és a CLL#5 alcsoport bizonyult a
leggyakoribbnak. A szerzők kiemelik, hogy az elmúlt évek fejlesztéseinek
köszönhetően valamennyi hazai onkohematológiai diagnosztikus laboratóriumban
elérhető a nemzetközi ajánlások alapján kivitelezett IGHV-mutáció-analízis.

Summary. The Hungarian Society of Hematology and Transfusiology’s
Molecular Oncohematological Diagnostic Workgroup analyzed the mutational status
of the immunoglobulin gene heavy chain region in 2261 CLL patient between 2018
and 2020 in five Hungarian oncohematological center. In this cohort 53.5% of the
cases proved to have unmutated immunoglobulin gene, meanwhile mutated cases
represented 41.6% of the entire cohort. We detected stereotype subsets in 11%,
of which CLL#2, CLL#1, CLL#6, CLL#4, CLL#3, and CLL#5 were the most common. The
authors highlight that collaborative efforts during the last few years lead to
availability of the IGHV mutation analysis in the Hungarian diagnostic
oncohematology laboratories as recommended by international standards.
Seasonal variation in essential oil content and chemical profile of mint in southeast of Brazil
Authors: Alvarenga Joyce Pereira , Braga Andreísa Flores , Pacheco Fernanda Ventorim , Carvalho Alexandre Alves de , Pinto José Eduardo Brasil Pereira , Bertolucci Suzan Kelly Vilela
Published: July 2021

ABSTRACT: This study evaluated the influence of seasonality in essential oil (EO) chemical composition of Mentha x piperita L. and Mentha viridis L. grown in southeast of Brazil. Leaves were collected from November 2011 until August 2013, in the middle of the following seasons: Spring (November), Summer (February), Autumn (May) and Winter (August). EO extraction was carried out by hydrodistillation in Clevenger apparatus for 1 hour. Chemical composition of EO was analyzed by GC-FID and GC-MS. The EO content and its chemical composition were influenced by seasonality in both species. The highest EO content was obtained for M. x piperita during spring (4.26%) and for M. viridis during spring (3.30%) and summer (3.70%). Mentha x piperita increased menthol (16.31 to 41.26%), neomenthol (3.02 to 6.39%) and menthone (5.56 to 41.58%) contents during spring and summer, respectively. Whereas, M. viridis EO content did not show a quality response pattern in relation to seasonality. Therefore, harvest time for M. x piperita is recommended during spring, and for M. viridis is recommended during spring and summer.
Girdling, maturation degree and ethephon on azalea cuttings establishment
Authors: Vendruscolo Eduardo Pradi , Santos Fernanda Rodrigues , Campos Luiz Fernandes Cardoso , Seleguini Alexsander , Pires Larissa Leandro
Published: July 2021

Abstract The sector that ranges from cultivation to sale of ornamental species is highlighted in the agribusiness scenario, due to the frequent increase in demand for its products. This importance encourages the exploration of new technologies that allow the development of protocols for the multiplication of species of commercial interest. Thus, the objective of this study was to evaluate and validate the use of girdling, ethephon and the selection of degree of branch maturation as techniques for increasing the establishment of cuttings of Rhododendron simsii Planch. The treatments combining the three study factors were applied to the branches of the parent plants: two levels of girdling (with and without), two levels of application of ethephon at the concentration of 900 mg L-1 (with and without application) and two degrees of maturation (woody and herbaceous). It was found that the presence of branch girdling increased the rate of establishment of cuttings by 43.75%, while the joint use of two techniques, the application of ethephon and the selection of herbaceous cuttings, resulted in an establishment rate 56.25% higher than the average of other treatments. Thus, it can be concluded that both branch girdling and the application of ethephon combined with the use of herbaceous branches can be used as techniques for the greater establishment of cuttings of Rhododendron simsii Planch.
Phytochemical and Bioactivity Analysis of Several Methanolic Extracts of Nine Bryophytes Species
Authors: KOCADAĞ KOCAZORBAZ Ebru , TOK Kerem , MOULAHOUM Hichem , ÜN Rabia Nur
Published: July 2021

Bryophytes are a class of organisms found all over the globe except the sea. They can grow on different surfaces and are known for their fragrant aromas and strong hot and bitter taste. Bryophytes have been used in traditional Chinese medicine for the treatment of many pathological conditions. In the current study, we describe the bioactivities present in methanolic extracts obtained from 9 species of bryophytes. Plant samples were dried and extracted in a water/methanol solution which was explored for flavonoid and phenolic content. Afterwards, the extracts were analyzed for their potential bioactivities including DPP4 inhibition, metal chelation, antioxidant, and antiglycation activities. Results indicate that the methanolic extracts of each species showed high effectiveness for different bioactivities. The current findings suggest these bryophytes as promising source of therapeutics against oxidative stress, hypertension, and diabetes.
Treatability of Wastewater Containing Reactive Yellow 145 Dyestuff by Ozonation Process
Authors: TANATTI Pınar Nazire
Published: July 2021

When the textile industry wastewater volume and considering the composition appears to be one of the most environmentally hazardous industries. Due to the basic properties of textile dyeing industry wastewater, additional precaution are required besides conventional wastewater treatment to remove color. The most basic approach is to remove the color of the wastewater and to break down the chromophores and double bonds that make up the color by oxidative means. In this study, the treatability of wastewater containing Reactive Yellow 145 (RY 145) dyestuff by ozonation process has been investigated. The initial concentration of the wastewater containing RY 145 is 50 mg / L. In the study, pH, O3 dose and reaction time parameters have been studied in RY 145 dye removal. The most appropriate removal of RY 145 from wastewater have occured at pH 5, 0.05 g / L.sa O3 dose and 10 minutes reaction time. The removal efficiency of RY 145 has obtained as 99.07% under optimum conditions.
qPCR assay for detecting round goby invasive fish speciesNeogobius melanostomus v1
Authors: Ahmed Omneya , Eiler Alexander
Published: July 2021

Members of Ponto-Caspian gobies are predatory fish which have colonized freshwaters and brackish waters in Europe and North America causing a lot changes in the native ecosystems. Several eDNA assays were developed to identify round goby fish. We are going to describe two successful assays.
DiMeLo-seq: Directed Methylation with Long-read sequencing v1
Authors: Altemose Nicolas
Published: July 2021

Directed Methylation and Long-read sequencing (DiMeLo-seq) is a powerful method to map protein-DNA interactions at a single-molecule level across the genome (including repetitive regions). It can be multiplexed to analyze multiple base modifications at once (e.g. endogenous CpG methylation and directed pA-Hia5 adenine methylation). Additionally, PCR amplification is not necessary for this protocol, which means that sequencing readout is proportional to protein-DNA interaction frequency. Finally, DiMeLo-seq can be used to map multiple protein interactions across a long single molecule.
Наука оперативно-розыскной деятельности: философский, теоретико-правовой и прикладной аспекты
Authors: Захарцев С.И.
Published: July 2021

Книга посвящена рассмотрению науки оперативнорозыскной деятельности с точек зрения философии, теории права, а также практической работы. Исследуются актуальные теоретические вопросы науки, в том числе ее объект и методология, оперативно-розыскное право, оперативнорозыскная политика. Затрагиваются актуальные проблемы использования результатов ОРД в уголовном судопроизводстве, прокурорского надзора за ОРД и др. Для научных работников в области теории и философии права, оперативно-розыскной деятельности, уголовного процесса, криминалистики, преподавателей, студентов, аспирантов, практических работников, а также всех, кто интересуется проблемами оперативно-розыскной деятельности и оперативно-розыскного права.
Comparative Characterization of the Cellular Composition of the Black Scorpionfish (Scorpaena porcus L.) Hematopoietic Organs during the Spawning Season and the Period of Reproductive Inactivity
Authors: Andreyeva Alexandra Y.
Published: July 2021

Hematopoiesis in teleosts has a number of characteristics that are not fully understood. In the present work, the cellular composition of the hematopoietic organs (head kidney and spleen) of the black scorpionfish during the spawning season and the period of reproductive inactivity was studied using light microscopy. The morphology and the percentage of blood cells were described. The head kidney was shown to be the main hematopoietic organ of the black scorpionfish: immature blood cells of all hematopoietic lines at the different stages of differentiation were observed there. They were divided into 3 clusters depending on the average cell diameter. Lymphocytes, thrombocytes and colony-forming cells, the precursors for all types of blood cells, were observed within the cluster of small cells. The intermediate-size cluster comprised blast forms (erythroblasts and blasts of white blood cells). The large-size cluster consisted of maturing granulocytes, monocytes, macrophages, plasma cells, and mature erythrocytes. The spleen mainly contained mature erythrocytes, showing signs of senescence, and erythrocyte ghosts. Therefore, it was concluded that the spleen of the black scorpionfish performs the function of depositing and utilizing erythrocytes. The study also demonstrated the seasonal dynamics of hematopoiesis. The increase in the number of erythroblasts was recorded in the head kidney of spawning individuals. Erythroblasts were also found in the spleen, in spite of their total absence in the reproductively inactive fish. Consequently, the spleen of the black scorpionfish is an organ of secondary erythropoiesis, which functions when the hematopoietic capacity of the kidneys is insufficient
The Time-fractional Airy Equation on the Metric Graph
Authors: Rakhimov Kamoladdin , Sobirov Zarifboy
Published: July 2021

Initial boundary value problem for the time-fractional Airy equation on a graph with finite bonds is considered in the paper. Properties of potentials for this equation are studied. Using these properties the solutions of the considered problem were found. The uniqueness theorem is proved using the analogue of Gr¨onwall-Bellman inequality and a-priory estimate
Gold Leaching by Various Solutions, Alternative of Cyanide and Their Prospects in the Future
Authors: Kholov Kholmahmad I. , Sharifboev Nasim T. , Samikhov Shonavruz R. , Dzhurakulov Sherzod R. , Zarifova Mahjuba S.
Published: July 2021

The article discusses four alternative cyanide substitutes for the recovery of gold from ores and concentrates. Cyanide has been the premier gold leach reagent for over 100 years due to its high recovery, low cost and reliability. However, environmental damage from improper management has led to widespread research aimed at identifying and developing less toxic leaching agents. The article discusses the most widely researched cyanide substitutes, but it is clear that none of them has yet made any significant incursion into the dominance of cyanide as the preferred reagent in the vast majority of gold mines around the world
Bias-Corrected Maximum Likelihood Estimators of the Parameters of the Unit-Weibull Distribution
Authors: Menezes Andre , Mazucheli Josmar , Alqallaf F. , Ghitany M. E.
Published: July 2021

It is well known that the maximum likelihood estimates (MLEs) have appealing statistical properties. Under fairly mild conditions their asymptotic distribution is normal, and no other estimator has a smaller asymptotic variance.However, in finite samples the maximum likelihood estimates are often biased estimates and the bias disappears as the sample size grows.Mazucheli, Menezes, and Ghitany (2018b) introduced a two-parameter unit-Weibull distribution which is useful for modeling data on the unit interval, however its MLEs are biased in finite samples.In this paper, we adopt three approaches for bias reduction of the MLEs of the parameters of unit-Weibull distribution.The first approach is the analytical methodology suggested by Cox and Snell (1968), the second is based on parametric bootstrap resampling method, and the third is the preventive approach introduced by Firth (1993).The results from Monte Carlo simulations revealed that the biases of the estimates should not be ignored and the bias reduction approaches are equally efficient. However, the first approach is easier to implement.Finally, applications to two real data sets are presented for illustrative purposes.
Optimization of power distribution of network channels based on Orlin's algorithm
Authors: Іvоhіn E. V. , Makhno M. F. , Shklyar V. O.
Published: July 2021

The article proposes an algorithm for solving the problem of optimal distribution of the capacity of data transmission channels between providers and Internet users. A mathematical model of the problem of distribution of a limited homogeneous resource with transport-type constraints is formulated. A solution method based on Orlin's stream algorithm is considered. A practical application of the algorithm for solving a real distribution problem is proposed. The results of the capacity of the channels of the computer network are obtained with a perspective increase in the capacity of the connections represented by the intervals of the planned changes. An analysis of the solutions obtained with different number of switching servers was made, conclusions about the choice of the provider to meet the optimal information needs of users were made.
Mental disorders against the background of different strategies of government regulation to counter the spread of COVID-19
Authors: Odintsova M.
Published: July 2021

The article includes a literary review of scientific works devoted to the study of specific features of the motivational and personal sphere of mothers with children diagnosed with Autism Spectrum Disorder (ASD), published in a number of countries in Africa and the Middle East. The author describes the difficulties faced by mothers in the process of education and treatment of their autistic children in these regions of the world; provides statistics on the extension of autism among the child population in South Africa, Saudi Arabia and Iran. The article presents studies assessing the degree of influence of religious and cultural aspects on the parents’ perception of their "special" children in Israel and Somalia.
Smart drugs are as a dangerous model of psychoactive substance use
Authors: Rychkova O.V.
Published: July 2021

When examining the factors of the use of psychoactive substances (PAS) by young people, recreational consumption has traditionally been studied. The second well-known causal model to examine psychoactive substances was its interpretation as a way of coping with stress for persons with a limited number of adaptation strategies. But data from foreign studies show the development of a new practice of consumption of stimulants, including permitted drugs, in order to improve mental productivity, performance, and improve cognitive function. The pace of life, loads, complex tasks that have to be solved in adolescence are increasing. In conjunction with the models of social behavior influencing the modern young persons, with the cult of success, achievements, perfectionist attitudes, this creates the motivation for self-improvement. And unless ways of improving the body have repeatedly become the topic of scientific researches and publications, the desire to improve the one's own brain function stays in the shadows, it has not yet attracted attention of Russian specialists and needs to be studied. The article analyzes the data of empirical studies that indicate an increase in the consumption of nootropics and other stimulants by students to achieve academic success.
The capital of individuality: A prehistory and basic assumptions
Authors: Dorfman L.Y. , Mishkevich A.M. , Kalugin A.Y.
Published: July 2021

An overview of modern foreign capital studies is presented. Human, social, psychological capitals as independent areas of research are singled out and described. For the first time, the concept of the capital of individuality, complementing other types of capital, is being introduced and developed. The basic features of capital are revealed through the concepts of resources and potentials. Individual properties taken together are shown as distributed resources and potentials, on the one hand, the combined resources and potentials of the individuality taken together by its properties on the other. The perspective of a systematic study of the capital of individuality may be the appeal to the theory of integral individuality of V.S. Merlin and the concept of system integration of human individuality by B.A. Vyatkin and L.Y. Dorfman. An approach to empirical study of the capital of individuality is planned, taking into account the multi-level properties of integral individuality as resources and potentials that enable a person to achieve high results in various areas of life. The concept of the capital of individuality is introduced in order to complement the existing notions of individual differences with a view of them from the point of view of revealing the strengths of human possibilities for existence, life support, individual success.
The history of the development of theatre practices in education: foreign and Russian experience
Authors: Poskakalova T.A.
Published: July 2021

The article briefly describes the history of the development of theatrical practices in education in Russia and abroad. The main dimensions of theater and drama in contemporary pedagogy are considered. The article demonstrates that various forms of theater in education are more widespread and better developed in foreign pedagogy, where theater is not limited to the framework of school disciplines as it is used as a means for providing complex solutions of problems related to development, learning and socialization. It is substantiated that in the practice of Russian schools, theater is much less in use, since it is so far applied exclusively as a means of introduction to culture, its traditions and values.
Nerve seam from the point of view of the study of nerve healing
Authors: Krasin P. M.
Published: July 2021

The topic that I touch upon in this article is of outstanding scientific and practical interest, since the nerve seam is closely connected with the science about the healing of the nerve.
Military psychiatric affairs in the Austro-Hungarian, German and French armies
Authors: Sobolevsky A. V.
Published: July 2021

With regard to alcoholism in the German army, on this issue, one can point to the rather detailed work of Dr. Stier. Having prefaced the essay on the influence of alcohol on a person, the author proceeds to the question of the meaning of this influence for the army in peacetime and wartime.
M. Allen Starr. Deafness caused by brain damage. Deafuesse due to lesion in the brain. Journ. of Nerv. and Ment. Diseases, 1910, № 7.
Authors: Likhnitsky Vitaliy N.
Published: July 2021

Cases of deafness caused by damage to the brain are not common; the reason for this may be either cortical foci - more or less extensive destruction of the temporal lobes, or the defeat of pontis Varolii. The case described by the author belongs to the second group.
T. Prout and A. Taylor. Severing the posterior roots in the case of persistent gastralgia in a tabetic. Introspinal neurectomy for intractable tabetic gastralgia. — Journ. of Nervous and Ment. Diseases, 1910, № 7
Authors: Likhnitsky Vitaliy N.
Published: July 2021

Patient 50 years old, 7 years old suffers from tabes dorsalis. One of the early symptoms of this disease was severe pain in the stomach, against which the patient was forced to resort, for more than 5 years, to injections of morphine.
Minutes of the annual meeting of the Society of Neuropathologists and Psychiatrists at the Imperial Kazan University on January 26, 1911.
Authors: Darkshevich L. O. , Voroshilov V. K.
Published: July 2021

Chaired by prof. L.O. Darkshevich under the secretary of Dr. V. K. Voroshilov. Attended by: prof. Osipov, Chistovich, doctor Pervushin, favorsky, Mikhailov, Nikolaevsky, Protopopov, N. A. Donskov, V. A. Donskov, Bolberg, Lopatin, Tsypkin, Golovin, Chirkovsky, Emdin, Arkhangelskaya, Semileyskaya, Skuridin, Kushelevsk students.
Calculation, design and manufacture of heteropolar magnetic levitation and linear drive systems of maglev transport
Authors: Antonov Yuri F.
Published: July 2021

Background: The methods of calculation and elements of the technology for creating heteropolar magnetic systems of levitation, lateral stabilization and a rotor-runner of a traction linear synchronous motor for the development of the transport technology "Russian Maglev" in order to achieve an increased levitation gap of 0.2 m, reduce the threshold speed of the exit vehicle in levitation mode up to 10 km/h.
Aim: to develop methods for calculating and designing heteropolar poles from elementary permanent magnets, coils of the same type based on composite low-temperature superconductors and high-temperature tape superconductors of the second generation and a step-by-step technology for their production.
Tasks:

Creation of an on-board magnetic system of levitation and lateral stabilization, allowing to provide a levitation gap of 0.2 m, a threshold value of vehicle speed of 10 km/h when transition to levitation mode, to reduce stray magnetic fields to the level of the natural field of terrestrial magnetism of 50 T;
Creation of a rotor-runner of a linear synchronous motor with an ironless stator with a power of 10 MW.

Methods: outlines the main calculation methodologies: "analysis" and "synthesis". The "analysis" methodology is adopted in solving the "direct" calculation problem, when the configuration of the magnetic system is set and the magnetic field in the working area is calculated, and, if necessary, the stray magnetic fields. This methodology can be effectively applied if there is experience in creating magnetic systems. Otherwise, the "synthesis" methodology is applied, which is used in solving the "inverse" calculation problem, in which the picture of the distribution of the magnetic field in the working zone is set and the configuration of the magnetic system is found (synthesized).
Results of the study performed:

The parameters and characteristics of high-energy permanent magnets made of rare-earth metals, low-temperature and high-temperature superconducting winding materials have been analyzed, the choice of permanent magnets and superconducting winding material has been made;
Calculations of the magnetic system of permanent magnets in the "Halbach assembly" and in the traditional assembly in a toothed ferromagnetic core have been carried out;
Calculations of a track coil with a rectangular cross-section of the winding are performed;
Methods for calculating and optimizing superconducting magnetic systems from a set of similar track modules have been developed;

Conclusions: The results of the performed fundamental research will allow starting the calculation, design and construction of conveyor-main passenger and freight lines of maglev transport, as well as urban public transport.
Methodology for assessing the readiness of territories for the formation of the infrastructure of the innovative port logistics complex
Authors: Manova Veronika A. , Lebedeva Anna S. , Noviniuk Olesya N. , Syropyatov Vladimir V.
Published: July 2021

The article analyzes the existing methods for assessing the readiness of territories for the formation of a logistics complex, examines the factors affecting the formation of the infrastructure of an innovative port logistics complex. An author's method for assessing the readiness of territories for the formation of the infrastructure of an innovative port logistics complex.
Antecedents and the Consequences of Employee Mobility
Authors:   , Seo Donghwi , Lee Jeongsik , Tzabbar Daniel
Published: July 2021

This dissertation investigates the antecedents and consequences of employee mobility with regard to three factors: constraints, networks, and learning. To do so, in Chapter 3, I examine the impact of mobility constraints as a significant antecedent hindering employee mobility on a firm's exploratory innovation. By acknowledging the distinct networks embedded in the organization-collaborative network and knowledge network-based on the recent findings that two networks embedded in the same organization may differ in terms of their origins and implications, I investigate the distinctive underlying mechanisms through which mobility constraints influence an organization's exploratory innovation. In the findings, I found that the impact of mobility constraints is distinct from each other, depending on its embedded network structure. In doing so, I contribute to the existing understanding of the antecedents of employee mobility from the perspective of constraints and networks. In Chapter 4, based on the human capital theory proposing that external learning increases an individual's firm-general knowledge, which is applicable to elsewhere, I examine that incumbent employee's learning from mobile employees increases the incumbents' leaving the hiring firm. In contrast to existing studies examining the "learning by hiring" effect as a critical and positive consequence of employee mobility, I found that "learning by hiring" may negatively affect organizational performance by increasing an individual's turnover rate. In doing so, I demonstrate the potential cost related to a hiring firm's "learning by hiring," thus improving our understanding of the negative consequences of employee mobility from the perspective of learning. Overall, in this dissertation, I contribute to the employee mobility literature by 1) investigating the mobility constraints as a crucial antecedent hindering employee mobility, 2) examining network structure as an important consequence of employee mobility beyond boundary conditions, and 3) demonstrating the potential cost related to learning by hiring for the hiring firm. In doing so, this dissertation helps our understanding of the antecedents and consequences of employee mobility from the perspective of constraints, networks, and learning.
Broken Chains
Authors:   , Jones Kenneth Leo'nard , Flowers Alonzo M.
Published: July 2021

This qualitative study used portraiture as a research method to highlight and understand the lived experiences of three Black-male non-traditional aged learners during the college admissions application process. The study also sought to answer what are the issues and complexities facing Black male non-traditional learners during the college admissions process? Specifically, this study surfaced true experiences of non-traditional aged Black males engaged in the college admissions process for the first time. Portraiture operates in qualitative paradigms that links science to art merging the methodical and thorough depiction of excellent ethnography with the suggestive character of good writing. Much of the research around the college admission process for Black men is historical with attention on the overarching impact of historical court decisions, diminished school resources, and ethical college admission practices to increase access for traditionally aged minority students, but very little research exists on how Black non-traditional male learners make meaning of their college application experiences, or the spaces where their stories are being told. I captured some of those stories in this dissertation.
Tools to Promote Equity and Best Practices
Authors: Akee Randall , Carroll Stephanie R. , Ford Chandra L.
Published: July 2021

This is the second volume of a two-volume special issue of the American Indian Culture and Research Journal dedicated to the indirect impact of COVID-19 on Indigenous Peoples. The first, 44.2, reports on COVID-19’s extensive impact on Indigenous Peoples and the resulting variety of responses at community and local levels. This second volume, 44.3, provides specific research and insights for improving reporting, identification, and prevention of COVID-19 cases and deaths. Several contributors to this issue respond to the urgent need to ensure, for small populations, and Indigenous Peoples in particular, that data collection provides detailed information on race and tribal nation identifiers. Like this lack of data disaggregation, data inaccuracy also impedes understanding of the impact of a pandemic. Other researchers find that a hallmark of this pandemic—the shift from in-person to virtual interactions in many aspects of life—has clarified that innovative telehealth and virtual methods already underway for Indigenous Peoples may represent the frontiers of better health care, access, and service. “Moving Forward: No Scientific Integrity without an Acknowledgment of Past Wrongs,” a commentary emphasizing the necessary actions the US government must take if progress is to be made, concludes this special issue.
COVID-19 Telehealth for Indian Country: Tribal Response to an Emerging Pandemic
Authors: Stephens David , Wu Alexander , Vinson Eric , Woodbury Megan , Davis Celeste , Reilley Brigg , Mera Jorge , Leston Jessica
Published: July 2021

American Indian/Alaska Native communities are at higher risk of poor outcomes from Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). The Northwest Portland Area Indian Health Board’s program Indian Country Extensions for Community Healthcare Outcomes (ECHO) initiated telehealth sessions for health professionals. All resources were centralized at www.IndianCountryECHO.org. In its first six weeks, the program had 4,579 attendees. Participants submitted 563 questions to specialists. There were 22,683 webpage views, more than three times the pre-COVID-19 baseline. Evaluation found 94 percent of clinicians reported knowledge increase and 93 percent reported greater social support, demonstrating that a teleECHO network serving Indian country is an important part of emergency response.
Adult English Language Learner Pathway to Literacy Initiative
Authors: Kosobucki Ginger , Moore Kari
Published: July 2021

In 2017, Kari Moore of Exodus Refugee Immigration and Ginger Kosobucki of the Immigrant Welcome Center met and discussed the unique needs Kari had noticed in her beginning literacy learners at Exodus. In 2018, Ginger led the Immigrant Welcome Center’s Adult ELL Research Project, which exposed the need for more classes geared for literacy-level learners, as well as more teacher training. In 2020, Kari and Ginger collaborated to lead professional development opportunities for Indianapolis teachers, including ATLAS Study Circles and a 2-day TESOL training with an expert from Literacy Minnesota. Since that time, they have formed a cohort -- the Pathway to Literacy development team -- consisting of teachers from programs around the city. The team has developed a 10-week pilot program, an assessment tool, and a website all designed to more effectively serve the needs of adult immigrants and refugees developing literacy skills for the first time.  The Adult ELL Pathway to Literacy Initiative, a collaborative effort among educators in Indianapolis, is an attempt to provide access to vulnerable learners who have had limited access to educational opportunities.