bluuebunny/crossref_metadata_2025_split huggingface dataset:
Intelligent techniques, harmonically coupled and SARIMA models in forecasting solar radiation data: A hybridization approach
Authors: Sivhugwana K.S. , Ranganai E. 
Published: October 2020

The unsteady and intermittent feature (mainly due to atmospheric mechanisms and diurnal cycles) of solar energy resource is often a stumbling block, due to its unpredictable nature, to receiving high-intensity levels of solar radiation at ground level. Hence, there has been a growing demand for accurate solar irradiance forecasts that properly explain the mixture of deterministic and stochastic characteristic (which may be linear or nonlinear) in which solar radiation presents itself on the earth’s surface. The seasonal autoregressive integrated moving average (SARIMA) models are popular for accurately modelling linearity, whilst the neural networks effectively capture the aspect of nonlinearity embedded in solar radiation data at ground level. This comparative study couples sinusoidal predictors at specified harmonic frequencies with SARIMA models, neural network autoregression (NNAR) models and the hybrid (SARIMA-NNAR) models to form the respective harmonically coupled models, namely, HCSARIMA models, HCNNAR models and HCSARIMA-NNAR models, with the sinusoidal predictor function, SARIMA, and NNAR parts capturing the deterministic, linear and nonlinear components, respectively. These models are used to forecast 10-minutely and 60-minutely averaged global horizontal irradiance data series obtained from the RVD Richtersveld solar radiometric station in the Northern Cape, South Africa. The forecasting accuracy of the three above-mentioned models is undertaken based on the relative mean square error, mean absolute error and mean absolute percentage error. The HCNNAR model and HCSARIMA-NNAR model gave more accurate forecasting results for 60-minutely and 10-minutely data, respectively.
Highlights

HCSARIMA models were outperformed by both HCNNAR models and HCSARIMA-NNAR models in the forecasting arena.
HCNNAR models were most appropriate for forecasting larger time scales (i.e. 60-minutely).
HCSARIMA-NNAR models were most appropriate for forecasting smaller time scales (i.e. 10-minutely).
Models fitted on the January data series performed better than those fitted on the June data series.
Design of an electrostatic precipitator for a novel bituminous coal-fired circulating fluidised bed combustion power plant in Namibia
Authors: Nghishiyeleke Eliaser T. , Kemba Vallentinus M. , Endunde Alexander M. S. , Mashingaidze Melvin M. 
Published: October 2020

Coal-fired power plants utilising fluidised bed technologies emit copious amounts of fly-ash, which is harmful to people owing to its particulate nature. A planned 300 MW power plant will have an electrostatic precipitator (ESP) for fly-ash emissions control, in line with power generation industry best practices. This ESP should meet a fly-ash emission limit value ≤ 50 mg/Nm3. This paper details the design process and resultant technical specifications of a cold-side, single-stage, and plate-wire dry ESP designed for the power plant. The ESP will consist of twin-chambers with quadruple-fields (2 4 315 m3) and octonary bus-sections independently energised by individual high-frequency three-phase switched integrated rectifiers (70 kV, 800 mA) to maximise ionisation. Dynamically balanced, single-impact, tumbling hammer rappers (857.5 rpm) will dislodge fly-ash from the collector plates into mass-flow wedge-shaped hoppers. A specific collection area (≥ 56.9 m2/m3/s) and an ESP index (≥ 709.2 (kV/cm)2m2/m3/s) should guarantee a collection efficiency ( ≥ 99.5 %) and the specified emission limit value at 100 % boiler capacity and normal operating conditions (gas velocity ≤ 2.4 m/s; gas temperature ≤ 137 ℃; fly-ash loading ≤ 10 000 kg/Nm3; resistivity ≤ 1010 Ω‧cm). The design was successfully verified in principle using the validation square method, in conjunction with the leading comparable historical case studies approach. It is recommended to simulate ESP designs using suitable programs like Comsol Multiphysics and construct a pilot plant before attempting scaled-up construction and commissioning. Highlights A cold-side, single-stage plate-wire dry ESP system designed. Theoretical collection efficiency in excess of 99.5%. High-frequency, three-phase switched integrated rectifiers to be used for ionisation.
Fiscalización de la administración tributaria y cumplimiento de las obligaciones tributarias, según percepción de los microempresarios de Ceres, Perú
Authors: Díaz Estela Wiliam Luis , Lobato Campos Jorge Luis 
Published: October 2020

La recaudación de los impuestos está estrechamente ligada al cumplimiento de las obligaciones tributarias; por ello, el estudio establece la relación existente entre la facultad de fiscalización de la administración tributaria y el cumplimiento de las obligaciones que ello genere, desde la perspectiva de los microempresarios del parque comercial de Ceres de Ate_ Lima, durante el periodo 2016. La metodología utilizada en el presente artículo se realizó bajo el enfoque positivista, de tipo correlacionar con un diseño no experimental. Considerando la distribución no normal de las variables según la prueba no paramétrica Rho de Spearman, se determinó que existe una relación directa y estadísticamente significativa entre el nivel de facultad de fiscalización de la administración tributaria y el cumplimiento de obligaciones tributarias según el coeficiente r= .408 con un (p-valor= .000). Sin embargo, a nivel parcial, no se encontró relación significativa entre la facultad de fiscalización y cumplimento de obligaciones tributarias (r= .108; p-valor = .088); además, se encontró relación estadísticamente significativa entre el cumplimiento de obligaciones tributarias y la facultad de fiscalización a nivel de inspección (r= .249; p-valor = .000), así como también, con la facultad de fiscalización a nivel de control (r= .503; p-valor = .000). Por lo tanto, existe una relación directa y significativa media entre la facultad de fiscalización de la administración tributaria y el cumplimiento de las obligaciones tributarias, según la percepción de los pequeños empresarios pertenecientes a los diferentes regímenes tributarios, evidenciando que, cuanto más elevado es el conocimiento sobre la facultad de fiscalización que realiza la administración tributaria (SUNAT), mayor es la tendencia de mejora en función al cumplimiento de las obligaciones tributarias de los microempresarios.
Detracciones y liquidez, en una empresa transportista
Authors: Celis Vargas Cynthia Pilar , Atencio Carbajal Miguel Ángel 
Published: October 2020

A través del régimen de detracciones a las empresas que adquieren bienes y servicios, se les descuenta un porcentaje del pago a sus proveedores para depositarlo a nombre de estos contribuyentes como pago adelantado del impuesto general a las ventas, en la entidad financiera estatal. Existen empresas en inicio de operaciones con grandes flujos de inversión en las cuales su crédito fiscal es mayor a lo que debe, pese a ello, por errores mínimos tienen sus fondos recaudados, restando su liquidez para atender gastos corrientes, y dado a que el costo del dinero en el tiempo es importante, la presente investigación determina el nivel de relación entre detracción y la liquidez en la empresa transportista Valentín & Valentino S.A.C. dentro del periodo 2014 – 2016. El estudio desarrollado bajo el enfoque cuantitativo, es de tipo aplicada, de nivel correlacional, desarrollada bajo el diseño no experimental y de corte transversal. La población y muestra estuvo conformada por los 36 estados financieros correspondientes a los periodos 2014 – 2016, las técnicas aplicadas para la obtención de los datos fueron la revisión documentaria y la sistematización de información. Los resultados determinaron que existe relación positiva media entre detracción y razón corriente (rs= -0.562** p=0.000<0.05) y entre detracción y prueba defensiva (rs= -0.544** p=0.001<0.05); sin embargo, no se encontró relación entre detracción y capital de trabajo (rs=0.090 p=0.603>0.05), sin embargo, teóricamente estos fondos en el caso de ser liberados incrementarían considerablemente el capital de trabajo. Finalmente, en la medida en la cual las detracciones se han ido acumulando y no han sido debidamente liberados de los fondos, se ha incrementado la falta de capacidad para disponer de efectivo y operar con sus activos líquidos, debiendo la empresa recurrir a sus flujos de venta.
Gestión de costos y productividad, en una empresa Avícola
Authors: Llallacachi Catasi Omar Henry , Cornejo Cáceres Gisselle Coralia , Zuñiga Castillo Arturo Jaime 
Published: October 2020

Las empresas buscan mejorar su productividad bajo la optimización de costes, por ello el presente estudio determina la relación existente entre la gestión de costos y la productividad en la empresa avícola PRODMIL SAC., de Arequipa. Metodológicamente se utilizó el método de revisión documentaria como técnica de recolección de datos; como población de estudio se utilizó datos directos de los registros de costos de la empresa, sistematizándose 36 estados financieros de manera mensualizada. Para el análisis de los resultados se utilizó el método de investigación no experimental de nivel descriptivo - correlacional. Bajo este enfoque se logró determinar que existe relación significativa alta e inversa (r=-,878) entre gestión de costos y productividad según el ratio americano; que implica que a menores costos invertidos se tiene un mayor nivel en la productividad, en la empresa objeto de estudio.
The effect of heparin after primary percutaneous coronary intervention on short-term clinical outcomes in patients with ST-segment elevation myocardial infarction
Authors: Rouzbahani Mohammed , Rezaie Mohsen , Salehi Nahid , Janjani Parisa , Moghadam Reza Heidari , Rai Alireza , Montazeri Nafiseh , Naderipour Arsalan , Rad Etrat Javadi , Asgari Nader , Mahmoudi Sousan , Motevaseli Sayeh , Azimivaghar Javad 
Published: October 2020

Background: Doing percutaneous coronary intervention (PCI) in the first hours of myocardial infraction (MI) is effective in re-establishment of blood flow. Anticoagulation treatment should be prescribed in patients undergoing PCI to decrease the side effects of ischemia. The aim of this study is to determine the effect of heparin prescription after PCI on short-term clinical outcomes in patients with ST-segment elevation myocardial infarction (STEMI). Materials: This randomized clinical trial study was conducted at Imam Ali cardiovascular center at Kermanshah university of medical science (KUMS), Iran. Between April 2019 to October 2019, 400 patients with STEMI which candidate to PCI were enrolled. Patients randomly divided in two groups: intervention group (received 5,000 units of heparin after PCI until first 24 hours, every 6 hours) and control group (did not receive heparin). Data were collected using a checklist developed based on the study's aims. Differences between groups were assessed using independent t-tests and chi-square (or Fisher exact tests).Result: Observed that, mean prothrombin time (PT) (13.30±1.60 vs. 12.21±1.15, p<0.001) and partial thromboplastin time (PTT) (35.30±3.08 vs. 34.41±3.01, p=0.003) were significantly higher in intervention group compared to control group. Thrombolysis in myocardial infarction (TIMI) flow grade 0/1 after primary PCI was significantly more frequently in control group (5.5% vs. 1.0%, p=0.034). The mean of ejection fraction (EF) after PCI (47.58±7.12 vs. 45.15±6.98, p<0.001) was significantly higher in intervention group. Intervention group had a statistically significant shorter length of hospital stay (4.71±1.03 vs. 6.12±1.10, p<0.001). There was higher incidence of re-vascularization (0% vs. 3.0%; p=0.013) and re-MI (0% vs. 2.5%; p=0.024) in the control group.Conclusion: Performing primary PCI with receiving heparin led to improve TIMI flow and consequently better EF. Receiving heparin is associated with lower risk of re-MI and re-vascularization.
Trend analysis of antibiotics consumption using WHO AWaRe classification in tertiary care hospital
Authors: Bhardwaj Ankit , Kapoor Kaveri , Singh Vivek 
Published: October 2020

Background: Aim of the study was to assess trend in antibiotics consumption pattern from 2016 to 2019 using AWaRe classification, ATC and Defined daily dose methodology (DDD) in a tertiary care hospital. Antibiotics are crucial for treating infectious diseases and have significantly improved the prognosis of patients with infectious diseases, reducing morbidity and mortality. The aim of the study is to classify the antibiotic based on WHO AWaRe classification and compare their four-year consumption trends. The study was conducted at a tertiary care center, Pilakhuwa, Hapur. Antibiotic procurement data for a period of 4 years (2016-2019) was collected from the Central medical store.Methods: This is a retrospective time series analysis of systemic antibiotics with no intervention at patient level. Antibiotic procurement was taken as proxy for consumption assuming that same has been used. ATC for systemic use (ATC code J01) antibacterial was used and defined daily dose (DDD) per 100 bed days was calculated. Antibiotics were further classified as Access, Watch, and Reserve (WHO AWaRe classification). Antibiotics consumption was ranked based on their volume of DDD i.e., drug utilization (DU90%) was calculated. Non-parametric Pearson’s correlation coefficient was used for the comparison of consumption.Results: Mean antibiotic procurement increased 1.25 folds from 140.3 DDD in 2016 to 201 DDD in 2018. A significant fall was seen in total DDDs in year 2019 (p value <0.05). A total of 41 antibiotics agents (Access 12, Watch 21, Reserve 6 and Not recommended 2) were procured. Reserve category antibiotics were procured from 2017 onwards. Out of 41 antibiotics procured 11 antibiotics (Access 3 and watch 8) accounted for DU 90%.Conclusions: Antibiotics consumption of watch group was high and increasing antibiotic consumption trend was observed. Hospital antimicrobial stewardship program should be implemented to shift to use of Access group antibiotics and restrict use of Watch antibiotics.
Herd Immunity to SARS-CoV-2 among the Population in Saint-Petersburg during the COVID-19 Epidemic
Authors: Popova A. Yu. , Ezhlova E. B. , Mel’nikova A. A. , Bashketova N. S. , Fridman R. K. , Lyalina L. V. , Smirnov V. S. , Chkhindzheriya I. G. , Grechaninova T. A. , Agapov K. A. , Arsent’eva N. A. , Bazhenova N. A. , Batsunov O. K. , Danilova E. M. , Zueva E. V. , Komkova D. V. , Kuznetsova R. N. , Lyubimova N. E. , Markova A. N. , Khamitova I. V. , Lomonosova V. I. , Vetrov V. V. , Milichkina A. M. , Dedkov V. G. , Totolyan A. A. 
Published: October 2020

The first case of COVID-19 was diagnosed in St. Petersburg on March 2, 2020; the period of increase in the incidence lasted for 10 weeks, the maximum rates were recorded in mid-May, and subsequently there was a statistically significant decrease in the incidence.Objective: to determine the level and structure of community immunity to SARS-CoV-2 among the population of St. Petersburg during the period of intensive spread of COVID-19.Materials and methods. Selection of volunteers for the study was carried out through interviewing and randomization. The exclusion criterion was active COVID-19 infection at the time of the survey. 2713 people aged 1 to 70 years and above were examined for the presence of specific antibodies to SARS-CoV-2. Antibodies were detected by enzyme immunoassay.Results and discussion. Studies have shown that in St. Petersburg, in the active phase of COVID-19 epidemic, there was a moderate seroprevalence to SARS-CoV-2, which amounted to 26 %, against the background of a high frequency (84.5 %) of asymptomatic infection in seropositive individuals who did not have a history of COVID-19 disease, positive PCR result and ARI symptoms on the day of examination. The maximum indicators of herd immunity were established in children 1–6 years old (31.1 %), 7–13 years old (37.7 %) and people over 70 years old (30.4 %). Differences in the level of seroprevalence in the age groups of 18–49 years are statistically significant. The highest level of seroprevalence was found among the unemployed (29.7 %), healthcare workers (27.1 %), education sector (26.4 %) and business sector personnel (25 %). In convalescents, COVID-19 antibodies are produced in 75 % of cases. In individuals with positive result of PCR analysis carried out earlier, antibodies are detected in 70 % of the cases. The results of the study of herd immunity to SARS-CoV-2 are essential to forecast the development of the epidemiological situation, as well as to plan measures for specific and non-specific prevention of COVID-19.
Epidemiological Situation on Tick-Borne Borreliosis in the Russian Federation in 2019 Compared to the Period of 2002–2018
Authors: Rudakova S. A. , Pen’evskaya N. A. , Blokh A. I. , Savel’ev D. A. , Teslova O. E. , Kaneshova N. E. , Rudakov N. V. , Trankvilevsky D. V. 
Published: October 2020

Objective: to analyze the epidemiological situation on Ixodidae tick-borne borreliosis in the Russian Federation in 2019 in comparison with the period of 2002–2018.Materials and methods. The paper uses the data contained in Form No. 2 of the state statistical reporting for 2002–2019 and information obtained by the Reference Center for Monitoring Borreliosis of the Omsk Research Institute of Natural Focal Infections from 74 constituent entities of Russia in 2019. The main research method is epidemiological one with the use of modern information technologies.Results and discussion. In Russia, 8048 cases of tick-borne borreliosis (Lyme disease – LD) were recorded (5.48 0/0000) in 2019. The actual indicators of the LD incidence for the whole country and federal districts (FD) in 2019 were within the confidence limits predicted with linear regression based on the study of the dynamics of the epidemic process in 2002–2018 in the vast majority of cases. A steady upward trend in the LD incidence was observed during 2002–2019 in the Central Federal District due to 10 out of 18 entities (Moscow, Belgorod, Lipetsk, Moscow, Bryansk, Voronezh, Kursk, Ryazan, Tambov, Tula regions); in the Southern Federal District because of the Krasnodar Territory and the Volgograd Region; in the North Caucasus Federal District – because of the Stavropol Territory. Despite the fact that a downward trend in the incidence of LD has been established over the past 18 years in the North-West, Volga and Ural Federal Districts, in some subjects of these regions a trend towards an aggravation of the epidemiological situation is observed (the Komi Republic and Chuvashia, Penza Region). In the absence of a pronounced tendency to change in the incidence rate of LD in the Siberian and Far Eastern Federal Districts, Kemerovo Region-Kuzbass, the Republic of Tuva and the Trans-Baikal Territory where a growing trend has been identified require special attention. In the Ural and Siberian Federal Districts, the share of non-erythema forms among laboratory-confirmed cases of LD was higher than in other regions, which merits further study of the genome-specific features of borrelia populations and their carriers. Effective control of the LD epidemiological situation in Russia is possible provided that the control is improved and maintained, and the capacity of preventive measures and zoological-entomological monitoring of the activity and structure of the natural foci of LD is enhanced in the entities with the long-term tendency towards increase in the incidence of the disease.
Endemic Cholera in India and Imported Cholera in Russia: What is Common?
Authors: Monakhova E. V. , Ghosh A. , Mutreja A. , Weill F.-X. , Ramamurthy T. 
Published: October 2020

The endemicity of cholera in India has been well researched. Among the other endemic areas, Indian subcontinent appears to be the cradle of Vibrio cholerae genovariants, which subsequently spread worldwide. In contrast, all the cholera cases recorded in Russia are of imported origin. In the past century, such importations might result in epidemics, which, however, ended with elimination of toxigenic V. cholerae (TVC) from the affected areas. Currently, the incidence of TVC in water reservoirs or infected returnees from Asian countries are rare events, mostly due to constant surveillance activities. Furthermore, the climatic conditions in the majority of Russian regions are unfavorable for longterm environmental survival of the pathogen. On the other hand, global shifts in climate accompanied by unexpected anomalies in previously stable climatic zones may promote dissemination of imported TVC and emergence of cholera. In some regions of Russia, seasonal weather patterns are pretty similar to Indian. Molecular studies of isolates from diverse territories show that TVC have been introduced into new areas and acquired additional traits, absent in their ancestors.This article describes genomic characteristics of TVC isolates from Russia, India and some other countries. The review is complemented by bioinformatics analysis of important genetic markers to discriminate between clones that emerged in endemic regions and were imported into cholera-free locations. We have found more evidence in support of primary Indian origin of recent genovariants and their ongoing transformation, including the emergence of a new rtxA gene allele with a 60 bp deletion in addition to the previously known null mutation. In certain conditions, TVC could pose a potential threat of spreading epidemic cholera into Russia and other territories. Cholera control requires joint efforts of researchers to learn more about the pathogen at the molecular level for developing effective strategies to protect the humankind throughout the world.