bluuebunny/crossref_metadata_2025 huggingface dataset:
The Response of Soil Nutrients and Microbial Community Structures in Long-Term Tea Plantations and Diverse Agroforestry Intercropping Systems
Authors: Zhang Guolin , Chu Xingbiao , Zhu Hanyang , Zou Dongsheng , Li Longcheng , Du Linsen
Published: July 2021

During tea cultivation, diverse agroforestry is an important and established intercropping measure, with most studies concentrating on ecological service provision and economic returns. However, the response of soil nutrients and microbial community structures in long-term tea plantations with diverse agroforestry intercropping systems is poorly understood. In the present field study (2015), three intercropping agroforestry-tea patterns (Osmanthus-Tea (OT), Michelia-Tea (MT), Osmanthus-Michelia-Tea (OMT)) along with a study control (C) were examined in terms of these two knowledge gaps. Results showed that, in terms of tea cultivation, the OMT system is more suitable than the OT and MT systems. The OMT system significantly increased the total nitrogen (TN, 16.4%), total potassium (TK, 10.5%), available nitrogen (AN, 14.2%), available phosphorus (AP, 26.7%) and soil organic matter (SOM, 28.9%). The OMT system increased phylum Firmicutes and Bacteroidetes abundance by 35.8% and 9.6%. In addition, the OMT system enhanced the abundance of class Bacteroidia (99.5%), Erysipelotrichia (96.9%), Clostridia (93.5%) and Actinobacteria (19.6%), respectively. In general, the phylum bacteria Proteobacteria, Firmicutes, Actinobacteria accounted for the largest proportion of bacteria in all three intercropping systems. In this study, the abundance of Firmicutes, Actinobacteria, Proteobacteria, and Bacteroidetes were positively correlated with AN, SOM and TP. The results of the present study will help to develop a better understanding of the benefits imposed by different agroforestry intercropping systems on nutrient dynamics and microbial structural diversity during tea cultivation.
Impact of Perceived Organizational Support on OCB in the Time of COVID-19 Pandemic in Hungary: Employee Engagement and Affective Commitment as Mediators
Authors: Alshaabani Ayman , Naz Farheen , Magda Róbert , Rudnák Ildikó
Published: July 2021

The performance of the employees and productivity of each individual, in general, have been badly affected because of the COVID-19 pandemic. Organizational citizenship behavior is regarded as an interpretation of the performance of the employee which is essential to contribute more to the organization’s processes and success. Therefore, to increase the organizational effectiveness and achieve its goals, it is crucial to understand the factors affecting the organizational citizenship behavior of the employees. This study aims to examine the impact of perceived organizational support on organizational citizenship behavior with the mediating role of employee engagement and affective commitment. To collect the data for this study, a linear snowball sampling method was used, and 380 foreign employees working in different service companies in Hungary participated in the survey. Structural equation modeling (SEM) was used to test the proposed hypothesis. The results of the study revealed that perceived organizational support positively associated with organizational citizenship behavior and this relationship is also strongly mediated by employee engagement. On the other hand, employee engagement and affective commitment pose a direct positive influence on organizational citizenship behavior. This study has theoretical and practical implications as it will provide a comprehensive framework to better understand the factors influencing the organizational citizenship behavior of the employees.
On Consensus Index of Triplex Star-like Networks: A Graph Spectra Approach
Authors: Huang Da , Zhu Jian , Yu Zhiyong , Jiang Haijun
Published: July 2021

In this article, the consensus-related performances of the triplex multi-agent systems with star-related structures, which can be measured by the algebraic connectivity and network coherence, have been studied by the characterization of Laplacian spectra. Some notions of graph operations are introduced to construct several triplex networks with star substructures. The methods of graph spectra are applied to derive the network coherence, and some asymptotic behaviors of the indices have been derived. It is found that the operations of adhering star topologies will make the first-order coherence increase a constant value under the triplex structures as parameters tend to infinity, and the second-order coherence have some equality relations as the node related parameters tend to infinity. Finally, the consensus related indices of the triplex systems with the same number of nodes but non-isomorphic graph structures have been compared and simulated to verify the results.
Cayley–Klein Lie Bialgebras: Noncommutative Spaces, Drinfel’d Doubles and Kinematical Applications
Authors: Gutierrez-Sagredo Ivan , Herranz Francisco Jose
Published: July 2021

The Cayley–Klein (CK) formalism is applied to the real algebra so(5) by making use of four graded contraction parameters describing, in a unified setting, 81 Lie algebras, which cover the (anti-)de Sitter, Poincaré, Newtonian and Carrollian algebras. Starting with the Drinfel’d–Jimbo real Lie bialgebra for so(5) together with its Drinfel’d double structure, we obtain the corresponding CK bialgebra and the CK r-matrix coming from a Drinfel’d double. As a novelty, we construct the (first-order) noncommutative CK spaces of points, lines, 2-planes and 3-hyperplanes, studying their structural properties. By requiring dealing with real structures, we found that there exist 63 specific real Lie bialgebras together with their sets of four noncommutative spaces. Furthermore, we found 14 classical r-matrices coming from Drinfel’d doubles, obtaining new results for the de Sitter so(4,1) and anti-de Sitter so(3,2) as well as for some of their contractions. These geometric results were exhaustively applied onto the (3 + 1)D kinematical algebras, considering not only the usual (3 + 1)D spacetime but also the 6D space of lines. We established different assignations between the geometrical CK generators and the kinematical ones, which convey physical identifications for the CK contraction parameters in terms of the cosmological constant/curvature Λ and the speed of light c. We, finally, obtained four classes of kinematical r-matrices together with their noncommutative spacetimes and spaces of lines, comprising all κ-deformations as particular cases.
Newton’s Third Law in the Framework of Special Relativity for Charged Bodies
Authors: Rajput Shailendra , Yahalom Asher
Published: July 2021

Newton’s third law states that any action is countered by a reaction of equal magnitude but opposite direction. The total force in a system not affected by external forces is, therefore, zero. However, according to the principles of relativity, a signal cannot propagate at speeds exceeding the speed of light. Hence, the action and reaction cannot be generated at the same time due to the relativity of simultaneity. Thus, the total force cannot be null at a given time. In a previous paper, we showed that Newton’s third law cannot strictly hold in a distributed system where the different parts are at a finite distance from each other. This analysis led to the suggestion of a relativistic engine. As the system is affected by a total force for a finite period, the system acquires mechanical momentum and energy. The subject of momentum conversation was discussed in another previous paper, while energy conservation was discussed in additional previous papers. In those works, we relied on the fact that the bodies were macroscopically natural. Here, we relax this assumption and study charged bodies, thus analyzing the consequences on a possible electric relativistic engine.
Spatial Moduli of Non-Differentiability for Linearized Kuramoto–Sivashinsky SPDEs and Their Gradient
Authors: Wang Wensheng
Published: July 2021

We investigate spatial moduli of non-differentiability for the fourth-order linearized Kuramoto–Sivashinsky (L-KS) SPDEs and their gradient, driven by the space-time white noise in one-to-three dimensional spaces. We use the underlying explicit kernels and symmetry analysis, yielding spatial moduli of non-differentiability for L-KS SPDEs and their gradient. This work builds on the recent works on delicate analysis of regularities of general Gaussian processes and stochastic heat equation driven by space-time white noise. Moreover, it builds on and complements Allouba and Xiao’s earlier works on spatial uniform and local moduli of continuity of L-KS SPDEs and their gradient.
Modeling the Spread and Control of COVID-19
Authors: Trivedi Ashutosh , Sreenivas Nanda Kishore , Rao Shrisha
Published: July 2021

Data-centric models of COVID-19 have been attempted, but have certain limitations. In this work, we propose an agent-based model of the epidemic in a confined space of agents representing humans. An extension to the SEIR model allows us to consider the difference between the appearance (black-box view) of the spread of disease and the real situation (glass-box view). Our model allows for simulations of lockdowns, social distancing, personal hygiene, quarantine, and hospitalization, with further considerations of different parameters, such as the extent to which hygiene and social distancing are observed in a population. Our results provide qualitative indications of the effects of various policies and parameters, for instance, that lockdowns by themselves are extremely unlikely to bring an end to an epidemic and may indeed make things worse, that social distancing is more important than personal hygiene, and that the growth of infection is significantly reduced for moderately high levels of social distancing and hygiene, even in the absence of herd immunity.
Multiple Human Papilloma Virus (HPV) Infections Are Associated with HSIL and Persistent HPV Infection Status in Korean Patients
Authors: Kim Moonsik , Park Nora Jee-Young , Jeong Ji Yun , Park Ji Young
Published: July 2021

Infections with multiple human papilloma virus (HPV) types have been reported, but their role in cervical carcinogenesis has not been fully elucidated. In this study, 236 cases with multiple HPV infection were examined and compared to 180 cases with single HPV infection. HPV genotyping was performed with cervico-vaginal swab specimens using multiplex (real-time) polymerase chain reaction (PCR). In multiple HPV infection, the most prevalent HPV genotype was HPV 53, followed by HPV 16, 58, 52, and 68. HPV 33, 35, 39, 51, 52, 53, 58, and 68 were high-risk-HPV (HR-HPV) genotypes that were more frequently detected in multiple HPV infection compared to that in single HPV infection. The association between multiple HPV infection and high-grade SIL (HSIL) was significantly stronger compared to that of single HPV infection and HSIL (p = 0.002). Patients with multiple HPV infection displayed persistent and longer duration of the HPV infection compared to patients with single HPV infection. Multiple HPV infections have distinct clinicopathologic characteristics. Since it is associated with persistent HPV infection, HSIL, and different HR-HPV strains in contrast to single HPV infection, the presence of multiple HPV infection should be reported; close follow up is warranted.
The SARS-CoV-2/Receptor Axis in Heart and Blood Vessels: A Crisp Update on COVID-19 Disease with Cardiovascular Complications
Authors: Veluswamy Priya , Wacker Max , Stavridis Dimitrios , Reichel Thomas , Schmidt Hendrik , Scherner Maximilian , Wippermann Jens , Michels Guido
Published: July 2021

The SARS-CoV-2 virus causing COVID-19 disease has emerged expeditiously in the world and has been declared pandemic since March 2020, by World Health Organization (WHO). The destructive effects of SARS-CoV-2 infection are increased among the patients with pre-existing chronic conditions and, in particular, this review focuses on patients with underlying cardiovascular complications. The expression pattern and potential functions of SARS-CoV-2 binding receptors and the attributes of SARS-CoV-2 virus tropism in a physio-pathological state of heart and blood vessel are precisely described. Of note, the atheroprotective role of ACE2 receptors is reviewed. A detailed description of the possible detrimental role of SARS-CoV-2 infection in terms of vascular leakage, including endothelial glycocalyx dysfunction and bradykinin 1 receptor stimulation is concisely stated. Furthermore, the potential molecular mechanisms underlying SARS-CoV-2 induced clot formation in association with host defense components, including activation of FXIIa, complements and platelets, endothelial dysfunction, immune cell responses with cytokine-mediated action are well elaborated. Moreover, a brief clinical update on patient with COVID-19 disease with underlying cardiovascular complications and those who had new onset of cardiovascular complications post-COVID-19 disease was also discussed. Taken together, this review provides an overview of the mechanistic aspects of SARS-CoV-2 induced devastating effects, in vital organs such as the heart and vessels.
Antiviral Activity of Chrysin against Influenza Virus Replication via Inhibition of Autophagy
Authors: Kim Seong-Ryeol , Jeong Myeong-Seon , Mun Seo-Hyeon , Cho Jaewon , Seo Min-Duk , Kim Hyoungsu , Lee Jooeun , Song Jae-Hyoung , Ko Hyun-Jeong
Published: July 2021

Influenza viruses cause respiratory infections in humans and animals, which have high morbidity and mortality rates. Although several drugs that inhibit viral neuraminidase are used to treat influenza infections, the emergence of resistant viruses necessitates the urgent development of new antiviral drugs. Chrysin (5,7-dihydroxyflavone) is a natural flavonoid that exhibits antiviral activity against enterovirus 71 (EV71) by inhibiting viral 3C protease activity. In this study, we evaluated the antiviral activity of chrysin against influenza A/Puerto Rico/8/34 (A/PR/8). Chrysin significantly inhibited A/PR/8-mediated cell death and the replication of A/PR/8 at concentrations up to 2 μM. Viral hemagglutinin expression was also markedly decreased by the chrysin treatment in A/PR/8-infected cells. Through the time course experiment and time-of-addition assay, we found that chrysin inhibited viral infection at the early stages of the replication cycle. Additionally, the nucleoprotein expression of A/PR/8 in A549 cells was reduced upon treatment with chrysin. Regarding the mechanism of action, we found that chrysin inhibited autophagy activation by increasing the phosphorylation of mammalian target of rapamycin (mTOR). We also confirmed a decrease in LC3B expression and LC3-positive puncta levels in A/PR/8-infected cells. These results suggest that chrysin exhibits antiviral activity by activating mTOR and inhibiting autophagy to inhibit the replication of A/PR/8 in the early stages of infection.
Detection of Urinary Antibodies and Its Application in Epidemiological Studies for Parasitic Diseases
Authors: Nagaoka Fumiaki , Yamazaki Tatsuya , Akashi-Takamura Sachiko , Itoh Makoto
Published: July 2021

For epidemiological studies of infectious diseases, pathogen-specific antibody levels in an area give us essential and appropriate information. The antibodies against pathogens are usually detected in blood, the drawing of which inconveniences people. Collection of blood increases the risk of accidental infections through blood, and it is difficult to obtain the participation of the target populations, especially the younger generation. On the other hand, urine samples, which contain a high enough level of antibodies for ELISA, can be harmlessly and easily collected and therefore have been used for epidemiological studies for diseases. The antibody examination of urine has been used for the epidemiology of parasitic diseases with a high sensitivity and specificity of serum samples. In this paper, we reviewed antibody assays with urine for seven parasitic diseases that urine diagnostic methods have reported in the past, and these are important infections included in NTDs, caused, for example, by Leishmania donovani, Wuchereria bancrofti, Schistosoma japonicum, Paragonimus westermani, Echinococcus granulosus, Echinococcus multilocularis, Strongyloides stercoralis, and Opisthorchis viverrini. The easy and safe urine surveillance system might be an admirable tool for future epidemiological studies for infectious diseases.
Gendered Perspectives on Climate Change Adaptation: A Quest for Social Sustainability in Badlagaree Village, Bangladesh
Authors: Hossen M. Anwar , Benson David , Hossain Syeda Zakia , Sultana Zakia , Rahman Md. Mizanur
Published: July 2021

Climate change effects cause major socioeconomic challenges for marginalized groups, particularly women, in Bangladesh. Specifically, drought increases resource scarcity, causing social problems that impact women, which can be described as the gendered sociocultural construction of vulnerabilities. Given this constructed dimension of gender-based vulnerability, this paper explores the effects of drought on marginalized women in one local case study, namely Badlagaree village in Gaibandha district, Bangladesh. To examine this linkage, we collected qualitative primary data using ethnographic research methods, primarily focus group discussions. Findings show that gender-based vulnerability is increasing due to growing drought effects, including agricultural production loss. Marginalized women, because of their gender identity, encounter these drought effects through unemployment, food insecurity, illiteracy, early marriage, dowry costs and violence. While further national-scale research is required, this paper argues that in order to overcome such gender-based vulnerability, current development policies, social programs, and adaptation strategies should better recognize such social dynamics. Further, a gender-specific understanding requires incorporation into adaptation policies through greater collaborative governance as an important prerequisite for sustainability.
Element Content in Volcano Ash, Soil and River Sediments of the Watershed in the Volcanic Area of South Iceland and Assessment of Their Mobility Potential
Authors: Đorđević Dragana , Sakan Sanja , Trifunović Snežana , Škrivanj Sandra , Finger David
Published: July 2021

In this work, we present the results of element content in river sediments and soil of the Rangárvellir river in southern Iceland as well as in the volcano ash from the Eyjafjallajökull eruption in 2010. Severe natural catastrophes have devastating impact on the environment. We selected the Rangárvellir area located in the vicinity of Mt Hekla, Iceland’s most active volcano, for our study. This study site is ideal to investigate wind and water erosion and sediment transport processes of two main glaciers rivers: the Eystri-Rangá and the Ytri-Rangá and the Hroarslækur River. Sediments of these rivers consist of volcano materials, ash and lava. In order to assess the sediment dynamics, we collected sediment, soil and volcanic ash. The fractioning of the elements was carried out using sequential extractions. The distribution of Si indicates that the sediments originate from the same geochemical basis. Li and partly B exist in the first phase of volcanic ash and river sediments but not in the mobile phases of soils. In the mobile phase of volcanic ash, P was found but it did not exist in the first phase of soil and sediments. These results suggest the different chemical fingerprints in the water sediments and surrounding soil.
Hybrid Approach of Unmanned Aerial Vehicle and Unmanned Surface Vehicle for Assessment of Chlorophyll-a Imagery Using Spectral Indices in Stream, South Korea
Authors: Kim Eun-Ju , Nam Sook-Hyun , Koo Jae-Wuk , Hwang Tae-Mun
Published: July 2021

The purpose of this study is to compare the spectral indices for a two-dimensional river algae map using an unmanned aerial vehicle (UAV) and an unmanned surface vehicle (USV) hybrid system. The UAV and USV hybrid systems can overcome the limitation of not being able to effectively compare images of the same region obtained at different times and under different seasonal conditions, when using a method of comparing and analyzing with absolute values in remote sensing. Radiometric correction was performed to minimize the interference that could distort the analysis results of the UAV imagery, and the images were taken under weather conditions that would minimally affect them. Three spectral indices, namely, normalized difference vegetation index (NDVI), normalized green–red difference index (NGRDI), green normalized difference vegetation index (GNDVI), and normalized difference red edge index (NDRE) were compared for the chlorophyll-a images. In field application and correlational analysis, the NDVI was strongly correlated with chlorophyll-a (R2 = 0.88, p < 0.001), and the GNDVI was moderately correlated with chlorophyll-a (R2 = 0.74, p < 0.001). As a result of comparing the chlorophyll-a concentration with the in-situ chlorophyll-a imagery by UAV, we obtained the RMSE of NDVI at 2.25, and the RMSE of GNDVI at 3.41.
Plan integral de gestión ambiental de residuos sólidos
Authors: Flores Jorge
Published: July 2021

El objetivo de este artículo fue proponer un plan integral de gestión ambiental de residuos sólidos en   el ámbito territorial de la provincia de Piura, Perú. La metodología comprendió siete pasos apoyados en la guía metodológica publicada por el Ministerio del Ambiente de este país, el estudio tuvo alcance descriptivo. Se determinó la composición, volumen y características generales de los residuos sólidos del distrito y se propuso una solución medioambiental eficiente, con énfasis en la atención de zonas urbanas y marginales; apoyada en cinco componentes: información; capacidades de gestión, promoción de la transformación, comercialización y disposición final de los residuos sólidos; servicio de limpieza pública y: conciencia ambiental y participación ciudadana. Se concluyó que el éxito en la ejecución del plan requiere del compromiso de todos los actores vinculados en el sector de residuos sólidos, lo cual contribuye al mejoramiento de la calidad del servicio de manejo de residuos sólidos.
Libros y lectores en disputa: la primera Feria del Libro en Argentina (1943)
Authors: Rubinzal Mariela
Published: July 2021

Este artículo examina la experiencia de la primera Feria del Libro organizada por la Cámara Argentina del Libro en 1943. Este evento cultural, empresarial y político se realizó en un espacio estratégico de la trama urbana porteña y fue visitado por más de dos millones de personas. La relevancia de este caso radica en los vínculos que pueden observarse entre los productos culturales y el mundo de la política en entreguerras. Este estudio sociocultural de la política incorpora categorías y desarrollos teóricos provenientes de diferentes disciplinas, así como en lo empírico produce datos a partir de diferentes técnicas como el análisis documental, el análisis de discursos y del material fotográfico del evento histórico.
Fragmentos de una historia. Un itinerario de dos décadas en el Instituto Ravignani (1956-1977)
Authors: Pagano Nora C.
Published: July 2021

El texto procura contribuir a la profundización del conocimiento sobre la historia de una institución dedicada al estudio del pasado argentino y americano que este año conmemora su primer centenario. Se trata un trabajo exploratorio que aspira a reconstruir algunas líneas de un itinerario institucional que se desarrolló en medio de cambiantes coyunturas políticas y sociales, entre el golpe de Estado de septiembre de 1955 hasta poco después del producido en marzo de 1976. Tales líneas -susceptibles de ser profundizadas-, intentan dar cuenta de parte de la actividad académica desplegada en el Instituto Ravignani, tal como la misma se refleja en la documentación institucional durante la etapa sometida a análisis.
Reseñas
Authors: Wasserman Martín L. E. , Serulnikov Sergio , Pautasso Alejandro , Di Liscia María Silvia , Santilli Daniel
Published: July 2021

Reseña de Yun-Casalilla, Bartolomé (2019). Iberian World Empires and the Globalization of Europe 1415-1668. Singapur: Palgrave Macmillan, 520 páginas. Por MARTÍN L. E. WASSERMAN

 

Reseña de Echeverri, Marcela (2018). Esclavos e indígenas realistas en la Era de la Revolución. Reforma, revolución y realismo en los Andes septentrionales, 1780-1825. Bogotá: Universidad de Los Andes, Ediciones Uniandes. Por SERGIO SERULNIKOV

 

Reseña de Bragoni, Beatriz (2019). San Martín. Una biografía política del libertador. Buenos Aires: Edhasa, 336 páginas. Por ALEJANDRO PAUTASSO

 

Reseña de Otero, Hernán (2020). Historia de la vejez en la Argentina (1850-1950). Rosario: Prohistoria, 240 páginas. Por MARÍA SILVIA DI LISCIA

 

Reseña de Gomez, Teresita (2020). Los planes quinquenales del peronismo. Objetivos, prioridades y financiación. Buenos Aires: Lenguaje Claro. 351 páginas. Por DANIEL SANTILLI
Tratamiento de aguas residuales procedentes de la industria del niquelado químico / Treatment of wastewater from the chemical nickel plating industry
Authors: Catalán Rina Katerina Vásquez , Stagnaro Susana Yamila Martinez , Lavalle Teresa Laura , Chiacchiarini Patricia , Giaveno Alejandra Filipa
Published: July 2021

Debido a la creciente actividad industrial en la provincia de Neuquén, Argentina; relacionada principalmente a la extracción de gas y petróleo, se han establecido diferentes empresas que ofrecen servicios afines a ésta actividad. En éste caso, se ha trabajado con la industria del recubrimiento metálico, la que por medio del proceso de niquelado de piezas, también conocido como niquelado electroless, imparte a los materiales mayor resistencia a la corrosión y  dureza, aumentando así la vida útil de las herramientas y accesorios de perforación. Los residuos generados durante el proceso de recubrimiento de piezas contienen grandes volúmenes de soluciones con elevados niveles de níquel, altamente nocivo para la salud y el ambiente, con lo cual es primordial el desarrollo de técnicas de remoción del metal del medio acuoso para evitar que las soluciones de níquel, si fueran descartadas al ambiente, contaminen los cursos fluviales, haciendo de éstos un medio de transporte y en consecuencia, se transforme en una fuente de contaminación. La propuesta que se presenta a continuación abarca el empleo de técnicas de precipitación del metal, y el posterior tratamiento de las soluciones residuales resultantes, por adsorción y biosorción. Para el tratamiento por precipitación química se utilizó como reactivo precipitante N2H4 y, si bien el tratamiento propuesto remueve más del 99 % del níquel en solución, las cantidades de éste metal continúan siendo superiores a lo establecido por la normativa provincial ambiental vigente, la que indica hasta 3 mg.L-1 de níquel en aguas de descargas [1]. Por lo expuesto, es necesarios un segundo tratamiento de la solución sobrenadante, proponiendo en éste caso la adsorción del metal empleando como adsorbente un material arcilloso de descarte de la industria minera y, biosorción utilizando como biosorbente la biomasa descartada por la industria cervecera. El residuo con un contenido inicial de 8360 mg.L-1 de níquel fue reducido a 30 mg.L-1 luego de la precipitación química. A partir de la solución resultante, se inició el segundo tratamiento, en el cual se emplearon diferentes relaciones arcilla/sobrenadante y biomasa/sobrenadante, disminuyendo el contenido de níquel en la solución final a concentraciones en el equilibrio de 0,96 y 5,31 mg.L-1, respectivamente. Finalmente, se ha logrado la remoción del metal contaminante proveniente de la industria de niquelado químico al nivel permitido por la norma ambiental vigente, utilizando un tratamiento que combina tanto, técnicas de precipitación química, como adsorción y biosorción. Además, la importancia del presente trabajo, radica en el uso de materiales desechados de otras industrias, tales como la industria minera y la cervecera.
TRAINING SIMULATORS OF A SPECIAL PURPOSE INTEGRATEDDATA NETWORK AND HIERARCHICAL STRUCTURESIMULATOR TASKS
Authors: Басараб M.A. , Бельфер Р.A. , Кравцов А.В.
Published: July 2021

Предложена иерархическая структура построения объединенной сети передачи данных РФ категории специального назначения с учетом территориальной удаленности оконечных пунктов соединений. Изложены основные задачи по разработке алгоритмов функций учебных имитаторов такой сети в масштабе страны. Тем самым подтверждена возможность продолжения научно-практической работы студентов кафедры Информационная безопасность МГТУ им. Н.Э. Баумана по созданию усовершенствованных учебных имитаторов сети передачи данных для моделирования широкого спектра структур сети страны и выполняемых ими функций.

The hierarchical structure of the construction of the special purpose unified data transmission network of the Russian Federation is proposed, taking into account theterritorial remoteness of the connection endpoints. The main tasks for the development of algorithms for the functions of training simulators of such a nationwide network are described.
SEMANTIC PACKET CONVERSION MODEL FOR INDUSTRIAL INTERNET OF THINGS HETEROGENEOUS GATEWAY
Authors: Кулик В.А. , Вахитов С.А. , Киричек Р.В.
Published: July 2021

Рассматриваются вопросы семантического межпротокольного преобразования пакетов, поступающих на гетерогенный шлюз промышленного интернета вещей (ПИВ). Проведены эксперименты по измерению времени обслуживания сетевых пакетов при их приеме и конвертации в промежуточный формат гетерогенного шлюза, а также при обратном преобразовании и дальнейшей отправке из промежуточного формата в выбранный формат пакета. Исследованы следующие протоколы передачи данных: CoAP, MQTT, Modbus TCP, STOMP, OPC UA и HTTP. Получены аналитические модели семантического межпротокольного преобразования, использованные для разработки имитационной модели работы семантического шлюза ПИВ и протестированные на примере преобразований CoAP-MQTT и MQTT-CoAP. В ходе компьютерного моделирования разработанная модель была сопоставлена с моделью, описывающей работу шлюза, выполняющего инкапсуляцию заголовков и полезных данных прикладных протоколов в другие прикладные протоколы.

The issues of semantic protocol conversion of incoming packets coming to the heterogeneous gateway of the Industrial Internet of Things are considered. A series of experiments were carried out to measure the processing time of network packets when they were received and converted to the IIoT conversion format on the heterogeneous gateway, as well as when they were converted back and then sent from the intermediate format to the selected packet format. The following data transfer protocols were studied: CoAP, MQTT, Modbus TCP, STOMP, OPC UA, and HTTP. Analytical models of semantic protocol conversion were obtained. These models were used to develop a simulation model of the IIoT semantic gateway, which was tested on the example of CoAP-MQTT and MQTT-CoAP transformations. During computer simulation, the developed model was compared with a model thatdescribes the operation of the gateway that encapsulates the headers and useful data of application protocols in other application protocols.
AN APPROACH TO PREDICTING THE RELIABILITY OF ONBOARD SATELLITE COMMUNICATIONS EQUIPMENT
Authors: Мырова Л.О. , Попов В.Д. , Бычкова О.А.
Published: July 2021

Приведены результаты анализа проблемы оценки надежности средств связи (СС) с учетом воздействия факторов космического пространства на этапах производства. Рассмотрены особенности больших комплексов, как объектов испытаний на надежность. Представлены результаты анализа, показывающие, что нахождение бортовой аппаратуры СС в радиационных поясах Земли может привести к возникновению дефектов в кристаллах полупроводниковых приборов, которые могут стать причиной отказов в работе СС и, соответственно, снижения ее надежности. Приведена методология анализа работоспособности полупроводниковых устройств с учетом характеристик радиационных дефектов в МОП транзисторах. Показано, как при разработке и производстве с использованием методов испытаний можно прогнозировать работоспособность СС.

The results of the analysis of the problem of assessing the reliability of satellite communications equipment (CE) are given, taking into account the impact of space factors at the production stages. The features of large complexes as objects of reliability tests are considered. The results of the analysis show that the presence of onboard CE in the Earths radiation belts can lead to defects in the crystals of semiconductor devices, which can cause CE failures and, therefore, reduce its reliability. A methodology for analyzing the operability of MOSFET equipment is given, taking into account the characteristics of radiation defects in MOS transistors. It is shown how during the development and production using test methods, it is possible to predict the performance of the CE.
IMPLEMENTATION OF LDPC/RS CONCATENATED CODES ON FPGA
Authors: Зинченко М.Ю. , Левадний А.М. , Гребенко Ю.А.
Published: July 2021

Представлены результаты разработки каскадного кодека на ПЛИС с внутренним низкоплотностным (НП) кодом стандарта DVB-S2 и внешним кодом Рида-Соломона, позволяющим полностью исключить явление остаточного уровня ошибок.В программируемых логических интегральных схемах (ПЛИС) были реализованы кодер НП-кода с алгоритмом кодирования нерегулярное повторение с накоплением и декодер с модифицированным алгоритмом минимум-сумм . Проведена оценка влияния остаточного уровня ошибок на качество декодирования. Приведены описания разработанной архитектуры, экспериментального стенда и используемые ресурсы ПЛИС.

The paper presents the results of the development of a cascade codec on FPGAs with an internal low-density parity-check (LDPC) code of the DVB-S2 standard and an external Reed-Solomon code, that completely eliminates the phenomenon of residual errors. LDPC-code encoder with an irregular repetition with accumulation encoding algorithm and a decoder with a modified minimum sums algorithm were implemented in programmable logic integrated circuits (FPGA). The influence of the residual error level on the decoding quality is estimated. The paper presents the developed architecture, a description of the experimental stand and the FPGA resources.
USING THE FLOYD-WARSHALL ALGORITHM TO FIND THE TRANSMISSION ROUTE OF THE SYNCHRONIZATION SIGNAL WITH A MINIMUM NUMBER OF RECEPTIONS
Authors: Лобастова М.В. , Матюхин А.Ю.
Published: July 2021

Эффективное применение цифровых систем передачи невозможно без грамотной организации тактовой син- хронизации. В статье рассмотрена одна из проблем организации тактовой сетевой синхронизации передача сигнала синхронизации с минимальным числом переприемов. Для поиска наиболее эффективного маршрута для передачи сигнала синхронизации предлагается использовать алгоритм Флойда-Уоршалла.

Effective use of digital transmission systems is impossible without the competent organization of clock synchronization. The article considers one of the problems of organizing clock network synchronization, namely, the transmission of a synchronization signal with a minimum number of re-receptions. To find the most efficient route for transmitting the synchronization signal, it is proposed to use the Floyd-Warshall algorithm.
THE BASICS OF SELECTING THE OPTIMAL PARAMETERS OF ERROR-CORRECTING CODES FOR TELECOMMUNICATION SYSTEMS
Authors: Быховский М.А.
Published: July 2021

Рассмотрены основные принципы выбора параметров помехоустойчивых кодов для систем связи. Приведены формулы для вероятности ошибки декодирования разных кодов в зависимости от их длины и от вероятности ошибки демодуляции сигналов. Показано, что коды Рида-Соломона (RS) достаточно большой длины позволяют обеспечить высокую помехоустойчивость приема сообщений. Показано также, что в системе связи, в которой сообщения передаются с помощью многомерных ансамблей сигналов, а помехоустойчивые коды не используются, высокая помехоустойчивость приема сообщений обеспечивается при предельно малом отношении сигнал/шум на входе демодулятора. Выполнено сравнение параметров систем связи с кодами RS и спутниковой связи стандарта DVB-S2 с двоичными кодами с малой плотностью проверочных символов (LDPC). Показано, что высокая надежность передачи в системе обеспечивается при использовании с кода RS, имеющего существенно меньшую длину, чем у кода LDPC.

The basic principles of selection of parameters of error- correcting codes for communication systems are considered. Formulas, that allow determining the probability of decoding errors of different codes depending on their length and the probability demodulation errors of signals, are given. It is shown that Reed-Solomon (RS) codes of a sufficiently large length make it possible to ensure high noise immunity of receiving messages. It is also shown that in a communication system in which messages are transmitted using multidimensional signal ensembles, and error-correcting codes are not used, messages can be transmitted at a given speed with an extremely small signal/noise ratio at the input of the demodulator. A comparison of the parameters of communication systems with RS codes and the DVB-S2 satellite communications system with binary low-density parity-check codes (LDPC) is performed. It is shown that high transmission reliability in the system is achieved by using an RS code having a significantly shorter length than the LDPC code.
A TUNABLE COMPLEX BANDPASS FILTER WITH SWITCHABLE CAPACITORS
Authors: Гребенко Ю.А. , Аунг Ко.М.
Published: July 2021

Разработан метод расчета комплексных фильтров на переключаемых конденсаторах (ПК) по аналоговым про- тотипам. Для этого использован метод преобразования активного комплексного RC-фильтра путем замены резисторов на ПК. Рассмотрен вариант применения идентичных комплексных звеньев на инвертирующих интеграторах, позволяющий осуществлять перестройку параметров комплексного полосового фильтра (КПФ) c помощью синхронного изменения параметров идентичных комплексных звеньев. Представлена принципиальная схема КПФ с НЧ прототипом Баттерворта 2-го порядка на переключаемых конденсаторах.

The article is devoted to the development of a method for calculating complex filters on switchable capacitors based on analog prototypes. It is proposed the method of converting an active complex RC filter by replacing resistors with switchable capacitors. It is considered the application of identical complex links with inverting integrators, which allow the tuning of parameters of a complex bandpass filter by the synchronous change of parameters of identical complex links. As an example, a schematic diagram of a complex bandpass filter with 2nd order Butterworth low-frequency prototype with switchable capacitors is developed.
IMPROVEMENT OF THE REGULATIONS FOR NARROWBAND IoT WIRELESS NETWORKS USING CONVERGENT SOLUTIONS
Authors: Девяткин Е.Е. , Федоров Д.Н. , Гасс Я.М. , Иванкович М.В.
Published: July 2021

Рассмотрены и классифицированы существующие узкополосные беспроводные сети связи (УБСС), реализованные с использованием конвергентных решений. Показано, что появление нового объекта регулирования УБСС интернета вещей усиливает необходимость перехода от локальных корректировок законодательства в сфере связи к созданию инфо- коммуникационного кодекса Российской Федерации.

Existing narrowband wireless communication networks using convergent solutions are reviewed and classified. It is shown that the emergence of narrowband wireless networks of Internet of things increases the need for transition from local adjustments of legislation in the field of communications to the creation of the Infocommunication Code of the Russian Federation.
IDENTIFICATION OF DEVICES AND SYSTEMS OF NARRОWBAND WIRELESS NETWORKS OF THE INTERNET OF THINGS. PART I
Authors: Бородин А.С. , Киричек Р.В. , Сазонов Д.Д. , Рожков М.А. , Колесников А.В. , Бирман А.А. , Рогдев А.Н.
Published: July 2021

Представлено описание системы идентификации на базе архитектуры цифровых объектов (Digital Object Architecture DOA), которая в настоящее время рассматривается в качестве приоритетной для идентификации устройств и приложений интернета вещей. Приведен анализ альтернативных идентификаторов и показаны преимущества DOA как для задач идентификации, так и для борьбы с контрафактом. В первой части статьи рассмотрены основные положения, связанные с идентификацией устройств интернета вещей, проведен анализ существующих подходов и решений по идентификации. Дано описание базовых компонентов архитектуры цифровых объектов DOA и дана оценка возможности ее применения для построения систем идентификации.

A description of an identification system for IoT devices based on the Digital Object Architecture (DOA) is given. The analysis of alternative identifiers is carried out. The advantages of DOA for both identification and counterfeiting tasks have been shown. The first part of the article discusses the main provisions related to the identification of IoT devices.
IMMUNOLOGICAL ASSESSMENT OF THE STRESS RESPONSE IN PATIENTS WITH INFLAMMATORY POSTPROTHETIC COMPLICATIONS
Authors: Makedonova Yuliya , Mikhalchenko Dmitry , Kurkina Oksana , Afanasyeva Olga , Veremeenko Sergej , Venskel Elena
Published: July 2021

Post-prosthetic complications during dental implantation are accompanied by pain symptoms leading to disorders of the psychoemotional state. All this influences the behavior of patients. In addition, psychoemotional stress is often a factor of provocation and persistence of the complications. The presence of a stress state in the identified pathology, as well as the influence of various therapies on the treatment of post-prosthetic complications, is reflected in the dynamics of changes in the concentrations of both catecholamines (epinephrine, norepinephrine) and glucocorticoids (cortisol) — hormones of the medulla and the adrenal cortex. The aim: to conduct an immunological analysis of the stress response in patients with postprosthetic complications during dental implantation. Materials and methods: The study was performed in 120 patients with post-prosthetic complications during dental implantation before and during treatment: Group I (control) — 30 patients treated with the conventional therapy; group II — 30 patients treated with ozone therapy in addition to the conventional therapy; group III — 30 patients treated with transcranial electrical stimulation in addition to the conventional therapy; Group IV — 30 patients treated with a combination of conventional therapy, ozone therapy and transcranial electrical stimulation. The concentration of epinephrine, norepinephrine, cortisol, alkaline phosphatase, and the Garkavi index were evaluated. Results: The change in these indicators after the treatment indicates the normalization of the level of the studied enzymes — markers of bone homeostasis, which is confirmed by an improvement in the clinical picture in the oral cavity. Conclusion: changes in immunological parameters objectively reflect the psychoemotional state of patients. The nature of changes in the hormonal stress response to the treatment of post-prosthetic complications indicates the effectiveness of the therapeutic regimens used, and, as a result, a decrease in both pain symptoms and psychoemotional stress.
Klasifikasi Patah Tulang Dasar Kepala
Authors: Ridhoni Muhammad , Prasetyo Eko , Lampus Harsali L.
Published: July 2021

Abstract: Skull base fracture is a linear fracture that commonly occurs in the temporal cranium. Traumatic brain injury (TBI) often found and handled in the emergency department is head trauma and traffic accident is the main cause of base skull fracture. Approximately 25%-66% of traffic accidents cause fracture of the skull base according to the fracture site. This study was aimed to obtain the classification of skull base fractures and the most common types of classification. This was a literature review study using three databases, namely Google Scholar, ClinicalKey, and PubMed. Based on the inclusion and exclusion criteria, there were 14 literatures reviewed consisting of 1 retrospective study, 2 clinical reviews, 1 literature review, 3 review articles, 2 prospective studies, 3 case reports, 1 descriptive study, and 1 case study. These articles reviewed the classification of skull base fracture. The classification of each section was arranged based on the mechanism and location of skull base fractures. In conclusion, the classification of skull base fracture is divided into anterior, middle and posterior fossa cranii fractures. Fractures of the middle cranii fossa is the most common case and of the posterior cranii fossa is the rarest case.Keywords: traumatic brain injury (TBI); skull base fractures; fracture classification  Abstrak: Patah tulang dasar kepala merupakan jenis fraktur linier yang umum terjadi pada bagian temporal kranium. Kasus trauma yang sering ditemukan dan ditangani di unit gawat darurat ialah trauma kepala. Kecelakaan lalu lintas (KLL) merupakan penyebab utama fraktur basis kranii. Sekitar 25-66% kasus KLL menyebabkan kejadian fraktur basis kranii sesuai lokasi fraktur. Penelitian ini bertujuan untuk mengetahui jenis klasifikasi patah tulang dasar kepala dan jenis klasifikasi yang paling sering terjadi. Jenis penelitian ialah suatu literature review. Literatur diperoleh dengan menggunakan beberapa database, seperti Google Scholar, ClinicalKey, dan PubMed. Berdasarkan kriteria inklusi dan eksklusi didapatkan 14 literatur terdiri atas 1 retrospective study, 2 clinical review, 1 literature review, 3 review article, 2 prospective study, 3 case report, 1 descriptive study, dan 1 case study. Hasil penelitian mendapatkan 14 literatur mengulas tentang klasifikasi patah tulang dasar kepala dan klasifikasi setiap bagian disusun berdasarkan mekanisme fraktur dan lokasi fraktur yang terjadi. Simpulan penelitian ini ialah secara garis besar klasifikasi patah tulang dasar kepala terbagi atas fraktur fossa kranii anterior, media, dan posterior. Kasus fraktur fossa kranii media merupakan kasus yang paling sering terjadi dan kasus fraktur fossa kranii posterior merupakan kasus yang paling jarang terjadi.Kata kunci: trauma kepala; patah tulang dasar kepala; klasifikasi fraktur
Autotrascendencia y calidad de vida en asistentes a una Cátedra del Adulto Mayor en Cumanayagua, Cuba
Authors: Izaguirre-Bordelois Marioneya , López-Aristica María A. , López-Aristica Lidia , Santana-Isaac José
Published: July 2021

Introducción: El envejecimiento es un fenómeno poblacional mundial, que genera un grupo cada vez más numeroso de adultos mayores con el consiguiente deterioro físico y mental a esa edad, por lo que se hace necesario establecer mecanismos, políticas y actitudes que favorezcan un envejecimiento digno, las Cátedras del Adulto Mayor han sido un espacio idóneo para lograr este objetivo. El presente estudio tuvo como finalidad determinar el nivel de autotrascendencia de los adultos mayores asistentes a una la Cátedra Universitaria del Adulto Mayor y la repercusión en su calidad de vida. Método: Se realizó un estudio descriptivo transversal de 65 adultos mayores matriculados en una de estas cátedras durante el período lectivo 2017-2018, en la localidad de Cumanayagua de la provincia Cienfuegos (Cuba). Para obtener la información necesaria se aplicó una entrevista en profundidad y se aplicó la escala de autotrascendencia de Pamela G. Reed (1987). Resultados: El promedio de edad de los ancianos fue de 73,5 años, y el 68,7 % pertenecen al sexo femenino. El nivel de autotrascendencia de los adultos mayores estudiados fue alto. Conclusión: Quedo demostrado que estos contextos aglutinan a personas de diferente edad, sexo, escolaridad y zonas de residencia y además favorecen a elevar el nivel de autotrascendencia de los adultos matriculados y la mejora en su calidad de vida.