bluuebunny/crossref_metadata_2025_split huggingface dataset:
The fast and of low-cost-adsorbent to the removal of cationic and anionic dye using chicken eggshell with its membrane
Authors: Hevira Linda , Rahmi Azimatur , Zein Rahmiana , Zilfa Zilfa , Rahmayeni Rahmayeni 
Published: March 2020

The use of the chicken eggshell with its membrane as low-cost adsorbent had been done to the removal of synthetic dyes in aqueous solution. Adsorption method in the batch system was done to adsorb Methylene Blue and Indigo Carmine as the cationic and anionic dyes. Some parameters were studied such as pH, contact time, initial concentration of dyes and mass of ES+M to find the optimum adsorption. The functional group of ES+M like hydroxyl, amine, carboxyl and thiol were used to binding the dyes. The characteristics of ES+M were determined by FTIR and XRF to analyzed functional group and elements composition before and after adsorption. The adsorption capacity optimum of ES+M to adsorb Methylene Blue was 11.54 mg/g with % RE 92.34% in 30 minutes, and Indigo Carmine was 8.04 mg/g with % RE 64.34% in 15 minutes.
Artificial neural network estimation of data and channel characteristics in free-space ultraviolet communications
Authors: Arya Sudhanshu , Ho Chung Yeon 
Published: March 2020

In this paper, we develop an artificial neural network (ANN)-based algorithm for signal classification, i.e., data demodulation, and the estimation of channel characteristics, such as channel DC gain and turbulence distribution parameters, in free-space ultraviolet (UV) communication systems. In this scheme, the ANN-based receiver adaptively tracks the UV channel variation and is directly trained using the data generated from UV channel models. To evaluate the performance of the proposed algorithm across all turbulence regimes, log-normal, Gamma–Gamma, and negative exponentially distributed UV turbulence channels are considered. We demonstrate that the proposed algorithm is robust to perform accurate and reliable signal classification and UV channel estimation without knowing underlying UV channel models or channel state information (CSI). In addition, time complexity analysis is presented. It is shown that, even under the strong turbulence regime, the accuracy of the proposed algorithm is found to be higher than 97% in terms of correct classification. It is also demonstrated that the classification error rate performance of the proposed ANN-based detector is superior to that of a maximum-likelihood (ML)-based detector with perfect CSI.
Heterogeneous III-V on silicon nitride amplifiers and lasers via microtransfer printing
Authors: Op de Beeck Camiel , Haq Bahawal , Elsinger Lukas , Gocalinska Agnieszka , Pelucchi Emanuele , Corbett Brian , Roelkens Günther , Kuyken Bart 
Published: March 2020

The development of ultralow-loss silicon-nitride-based waveguide platforms has enabled the realization of integrated optical filters with unprecedented performance. Such passive circuits, when combined with phase modulators and low-noise lasers, have the potential to improve the current state of the art of the most critical components in coherent communications, beam steering, and microwave photonics applications. However, the large refractive index difference between silicon nitride and common III-V gain materials in the telecom wavelength range hampers the integration of electrically pumped III-V semiconductor lasers on a silicon nitride waveguide chip. Here, we present an approach to overcome this refractive index mismatch by using an intermediate layer of hydrogenated amorphous silicon, followed by the microtransfer printing of a prefabricated III-V semiconductor optical amplifier. Following this approach, we demonstrate a heterogeneously integrated semiconductor optical amplifier on a silicon nitride waveguide circuit with up to 14 dB gain and a saturation power of 8 mW. We further demonstrate a heterogeneously integrated ring laser on a silicon nitride circuit operating around 1550 nm. This heterogeneous integration approach would not be limited to silicon-nitride-based platforms: it can be used advantageously for any waveguide platform with low-refractive-index waveguide materials such as lithium niobate.
COMPARATIVE CHARACTERISTICS OF THE INFLUENCE OF TECHNOLOGY OF EXTRACTION ON ANTIOXI-DANT PROPERTIES FOR THE FARRY AND FLOWERS OF THE TENDER (CRATAEGUS)
Authors: Valeeva Aigul Raisovna , Makarova Nadezhda Viktorovna , Valiulina Dinara Fanisovna 
Published: March 2020

The purpose of this work is to determine the most optimal method for extracting hawthorn fruits and flowers (Crataegus) with antioxidant properties. Flowers hawthorn rich in chemicals (choline, essential oil, acetylcholine, trimethylamine, flavone glycosides, caffeic, chlorogenic, ursolic and other various acids) and hawthorn fruit consist of fatty oil, triterpene saponins, choline, acetylcholine, tannins, sorbitol and organic acids. In order to determine the most optimal method for extracting a complex of substances with antioxidant properties from hawthorn fruit and flower extracts, the content of dry substances, phenols, flavonoids was studied, and antioxidant activity was determined using two methods: by trapping free radicals and by using the FRAP (restoring force) method. By all indicators (the content of dry substances, phenols, flavonoids, antioxidant activity), studied in the work, hawthorn flowers had high values. In this work, three extraction technologies were used: traditional – infusion (37 °С, 2 h), and innovative – using microwave (800 W, 1 min) and ultrasonic irradiation (0.5 W, 2 h). Of all the types of extraction considered, the most efficient and effective, according to the results of experiments, is extraction using ultrasonic radiation.
COMPONENTS OF ARTEMISIA SOGDIANA
Authors: Mukhamatkhanova Rimma Fail'yevna , Bobakulov Khayrulla Mamadievich , Sham’yanov Il'dar Dzhamil'yevich , Оkmanov Rasul Yangiberdievich , Aisa Haji Akber , Sagdullaev Shomansur Shahsaidovich , Аbdullaev Nasrulla Dzhalilovich 
Published: March 2020

Phytochemical research and effective use of medicinal flora in the future create the basis for the development of the domestic pharmaceutical industry and allow not only to fill the deficit of drugs, but also contribute to the development of new, environmentally friendly and a number of qualities of unique, export-oriented preparations.
The plants of the genus Artemisia L. are rich sources of biologically active secondary metabolites. Phytochemical study of secondary metabolites of plants of the genus Artemisia has led to the creation on their basis, in particular, on the sesquiterpene lactones, antitumor (Artemisinin and its derivatives; Arglabin), antiatherosclerotic (Leucomisin (preparation Oligvon)), cardiotonic (Tauremisin), anthelmintic (α-Santonin) and antimalarial (Artemisinin and its derivatives) preparations.
In order to search for natural biologically active compounds, we studied the components of the alcohol extract of the aerial part of Artemisia sogdiana Bunge, collected during budding in the Zaamin district of the Jizzakh region of Uzbekistan. The result of phytochemical research for the first time from this plant is isolated a phenolic compound xanthoxylin, sesquiterpene lactone artesin, flavonoids genkwanin and eupatilin, the structure of which is established on the basis of spectral data.
QUALITY AND QUANTITATIVE COMPOSITION OF SUNFLOWER OIL DEODORIZATION DISTILLATE
Authors: Kukina Tat'yana Petrovna , Shcherbakov Dmitriy Nikolayevich , Panteleyeva Nina Vital'yevna , Sal'nikova Ol'ga Iosifovna , Kolosov Petr Vladimirovich 
Published: March 2020

The composition of the sunflower oil deodorization distillate has been investigated. 18 acidic components have been identified, more than 40% of the composition of the studied sample falls on linoleic acid with F-vitamin activity. More than 30 components of neutral nature have been found that are of interest as bioactive compounds. Of these, 10 are phytosterols, 14 are triterpene alcohols, 5 are tocopherols. The diterpene hydrocarbons, alcohols and acids of the kauran structure found in the composition of deodorization distillate indicate that the original sunflower oil was native, since it is known that kauran derivatives are a chemotaxonomic marker of many plants of the compositae family, including sunflower. In addition to the above compounds, hydrocarbons (more than a quarter of the unsaponifiable matter), both aliphatic and diterpenic, in the studied sample, was found. Aliphatic components are predominantly unsaturated, which may indicate their artifact origin, i.e. they are the products of the dehydration of aliphatic alcohols. Phytadiene isomers, products of phytol dehydration and isomerization, have been found. The data obtained indicate the prospects for the use of oil deodorization distillate as a source of bioactive substances, cosmetic ingredients and pharmaceutical components.
THE STUDY OF THE CAROTENOID COMPOSITION OF THE FRUITS OF SEA BUCKTHORN DIFFERENT VARIE-TIES BY THIN LAYER CHROMATOGRAPHY
Authors: Trineeva Ol'ga Valer'yevna , Rudaya Margarita Aleksandrovna , Slivkin Aleksey Ivanovich 
Published: March 2020

Sea buckthorn (Hippophae rhamnoides L.) is an object of general interest due to the high content of biologically active substances (BAS). Fruits contain water- and fat-soluble vitamins, organic acids, sugars, tannins, amino acids, flavonoids and carotenoids. The latter, in turn, give the fruits a typical yellow-orange color. Carotenoids (α-, β-, and γ-carotenes) make up 11% of the unsaponifiable fraction of sea buckthorn oil and are very valuable compounds for the cosmetics industry. Leading scientists of the world have found that carotenoids have antioxidant, antimutagenic and antitumor properties, and therefore are actively used for the prevention of cancer. The fruits of sea buckthorn are the raw materials for the pharmacopeia drug - sea buckthorn oil and a large number of various herbal medicines based on it. To separate and identify complex compounds, such as carotenoids, considerable attention is paid to the TLC method. In connection with the foregoing objective of the study was the study of the TLC profile of carotenoids of sea buckthorn fruits of various varieties.
Optimal chromatographic conditions were selected that ensure the best separation of carotenoid zones in a thin sorbent layer. In the used eluting system, satisfactory separation of the chromatographic zones of carotenoids is observed, since the value of sorption selectivity is greater than unity. To characterize the chromatographic profile of each variety, it is proposed to use a value of Rs that is more independent of the influence of various parameters and does not require standards. The difference in the obtained TLC profile of carotenoids of sea buckthorn fruits of representatives of ten different varieties, as well as for the fruits of a wild plant, was established. The maximum number of chromatographic zones is observed for the Ryabinovaya variety, and the minimum for the Stolichnaya variety. It was established that by the method of «fingerprints» it is possible to identify the sort of fruits of sea buckthorn by the type of chromatographic profile of carotenoids.
VARIABILITY OF COMPONENT COMPOSITION OF MELISSA OFFICINALIS L. ESSENTIAL OIL DEPENDING ON THE CLIMATIC CONDITIONS OF THE REGION OF CULTIVATION
Authors: Nevkrytaya Natal'ya Vladimirovna , Pashtetskiy Vladimir Stepanovich , Novikov Ilya Aleksandrovich , Korotkikh Irina Nikolaevna , Tkhaganov Ruslan Ramazanovich 
Published: March 2020

The aim of the research was to detect the dependence of content and component composition of Melissa officinalis L. essential oil from climatic peculiarities of the region of cultivation and to specify the optimum conditions for growing high-quality raw materials. We presented the results of the comparative assessment of essential oil component composition (three main elements) obtained from air-dried raw materials of two cultivars Krymchanka and Lada. These Melissa officinalis L. cultivars were grown in three regions that sharply differed in weather conditions. To make the comparison accurate, we determined the component composition of essential oil in the Laboratory of Biochemistry at FSBSI “Research Institute of Agriculture of Crimea” using gas chromatograph Kristall 5000.2. The most favorable climatic conditions for essential oil accumulation were in the Foothill zone of the Crimea (moderate rainfalls combined with high air temperatures). Cultivar Krymchanka exceeded cultivar Lada by the amount of essential oil in raw materials. Excess sometimes reached 170%. Dependence of the main components such as citral, β-caryophyllene, caryophyllene oxide, germacrene D from the ratio of temperature and precipitation was revealed. After obtaining research results, we could suggest that by controlling the conditions of cultivation of M. officinalis, it is possible to adjust the ratio of the components of essential oil.
RESEARCH OF MECHANICAL ACTIVATION OF TECHNICAL HYDROLYSIS LIGNIN AS A COMPONENT OF FUEL BRIQUET
Authors: Aleksandrov Aleksandr Vasil'yevich , Afanasova Anastasiya Valer'yevna , Rudenko Anatoliy Pavlovich 
Published: March 2020

The results of studies of changes in the fractional composition, calorific value and structure of lignin as a component of the fuel briquette as a result of mechanical activation based on the interpretation of experimental research data are given in the article. Criteria for mechanical activation are proposed. To identify the joint effect of mechanical activation time and the proportion of technical in the composition of the briquette, the experiment planning method was applied. As a result of data processing, a regression equation was obtained for predicting the calorific value of briquettes from the lignin content and the time of its mechanical activation, and its adequacy was proved. The developed methods and criteria for evaluating the results of thermogravimetric studies allow us to predict the efficiency of mechanical activation and the calorific value of technical hydrolysis lignin as a component of fuel briquette. At the same time, by varying the compositional composition and technological parameters of briquetting, it is possible to predict the production of fuel briquettes of required quality from wood waste.
ABNORMAL RHEOLOGY OF AGAR-AGAR SOLUTIONS PREPARED USING WATER EXPOSED TO AN ELECTRO-MAGNETIC FIELD
Authors: Markin Vadim Ivanovich , Shipunov Boris Pavlovich 
Published: March 2020

The paper presents the results of a study of the rheological properties of agar-agar solutions prepared using water exposed to an electromagnetic field with a frequency of 30 to 170 MHz. The studies were carried out at three temperatures: 25, 35, 45 °С, the concentration varied from 0.1 to 0.7%, and the shear rate varied in the range of 100–1000 s-1. As a result of the study, a distinct influence of the electromagnetic field was found, and the quantitative response depends on the shear rate, solution concentration, temperature and frequency of the electromagnetic field. In the vast majority of cases, a decrease in the viscosity of solutions is observed as a result of exposure to an electromagnetic field. There is practically no quantitative correlation of viscosity changes with frequency. There is a complex picture of the mutual influence of the solution concentration, the frequency of the electromagnetic field, temperature and shear rate when measuring viscosity. The temperature dependence of viscosity for solutions subjected to and not exposed to an electromagnetic field is multidirectional in nature and substantially depends on both the concentration of the solution, the frequency of the electromagnetic field, and the shear rate at which measurements were taken.
An explanation of the observed dependencies is proposed, which is based on the two-component agar-agar solutions, which leads to individualization of the changes in the rheological properties determined by agarose and agaropectin, respectively.
Descripción de la abertura y del cierre de los sonidos vocálicos [e] y [o] en la pronunciación de estudiantes potiguares y cearenses de Letras español
Authors: De Farias Maria Solange 
Published: March 2020

Los objetivos de este estudio son analizar y describir los errores relacionados con la abertura y el alzamiento de [e] y de [o] en la interlengua de graduandos potiguares y cearenses de español. Es una investigación descriptiva/explicativa de estudio de caso en el que se han utilizado como instrumentos de recogida de datos pruebas de lectura y habla semilibre aplicadas a veinticuatro aprendices. Los errores relacionados con la abertura y el alzamiento de [e] y de [o] más presentes en la interlengua oral de los referidos estudiantes son la abertura de [e] y de [o] y el alzamiento de [e] y de [o]. Estos errores se fosilizaron y algunos no impiden la comunicación pero otros la dificultan.
Vertical Jump on a Force Plate for Assessing Muscle Strength and Power in Women With Severe Obesity: Reliability, Validity, and Relations With Body Composition
Authors: Bellicha Alice , Giroux Caroline , Ciangura Cécile , Menoux Diane , Thoumie Philippe , Oppert Jean-Michel , Portero Pierre 
Published: March 2020

Abstract
Bellicha, A, Giroux, C, Ciangura, C, Menoux, D, Thoumie, P, Oppert, J-M, and Portero, P. Vertical jump on a force plate for assessing muscle strength and power in women with severe obesity: reliability, validity, and relations with body composition. J Strength Cond Res 36(1): 75–81, 2022—Muscle strength and power, particularly when assessed during multijoint movements such as vertical jump (VJ), are important predictors of health status and physical function. Vertical jump is mainly used in athletes, also in untrained or older adults, but has not yet been used in subjects with obesity. We aimed to assess the following in this population: (a) the reliability of VJ parameters, (b) their validity compared with isokinetic testing, and (c) their relations with body composition. In 20 women with severe obesity (mean [SD] age: 41.1 [11.6] years; body mass index: 43.9 [4.4] kg·m−2) without severe orthopedic disorders, VJ parameters, knee extension torque, and body composition were assessed using a force plate, an isokinetic dynamometer, and dual-energy x-ray absorptiometry, respectively. Excellent reliability was found for absolute peak power and peak force in VJ (intraclass correlation coefficient [95% confidence interval]: 0.95 [0.88–0.98] and 0.90 [0.77–0.96], respectively), and moderate to good validity of peak power and peak force compared with isokinetic torque (r = 0.79 and r = 0.67, respectively; all p < 0.01). Positive relations were found between peak force and peak power during VJ and lean body mass (r = 0.89 and r = 0.60, respectively; p < 0.01) and a negative relation was found between peak velocity or VJ height and fat mass (r = −0.65 and −0.64, respectively; p < 0.01). These results suggest that VJ on a force plate is a reliable and valid test for assessing muscle strength and power in severely obese subjects. Vertical jump testing is easy to implement, which can facilitate its use in both research and clinical testing in this setting (ClinicalTrials.govID: NCT03325764).
Ice Hockey-Specific Repeated Shuttle Sprint Test Performed on Ice Should Not Be Replaced by Off-Ice Testing
Authors: Legerlotz Kirsten , Kittelmann Jonas , Dietzel Marco , Wolfarth Bernd , Böhlke Nikolai 
Published: March 2020

Abstract
Legerlotz, K, Kittelmann, J, Dietzel, M, Wolfarth, B, and Böhlke, N. Ice hockey-specific repeated shuttle sprint test performed on ice should not be replaced by off-ice testing. J Strength Cond Res 36(4): 1071–1076, 2022—Although the importance of sport-specific testing has been stated in various studies, the application of standard tests that are little related to the requirements in competition is still widespread in performance diagnostics. Furthermore, the actual exercise mode in testing often deviates from the exercise mode in competition. The aim of this study was therefore to investigate how the performance in an ice hockey mimicking repeated sprint shuttle test conducted off-ice (RSS) differs from the on-ice performance (RISS). The two performance tests were completed by 21 male junior ice hockey players within one week. Anaerobic fatigue was significantly larger in RISS and did not correlate with RSS, whereas best run, mean run, total run time, turn and fly time, and total times in all three shifts correlated moderately. Although the best and mean run times did not differ, these times were achieved with different strategies depending on the test condition, indicated by significantly different split times. Aerobic fatigue in shift 3 was the only parameter where the off-ice measurement correlated strongly with the on-ice measurement. Our results imply that an off-ice test does not predict on-ice performance with sufficient precision, strongly advocating performance testing in the exercise mode used in competition.
Relationship Between Mechanical Effectiveness in Sprint Running and Force-Velocity Characteristics of a Countermovement Jump in Australian Rules Football Athletes
Authors: Morris Corey G. , Weber Jason A. , Netto Kevin J. 
Published: March 2020

Abstract
Morris, CG, Weber, JA, and Netto, KJ. Relationship between mechanical effectiveness in sprint running and force-velocity characteristics of a countermovement jump in Australian rules football athletes. J Strength Cond Res 36(3): e59–e65, 2022—This study evaluated the mechanical determinants of 40-m sprint performance in elite Australian Rules Football (ARF) athletes and identified variables of countermovement jumps (CMJs) that related to the sprint. Fourteen elite male ARF athletes (age = 22.7 ± 3.6 years; height = 1.88 ± 0.08 m; mass = 88.2 ± 9.38 kg) completed two 40-m sprints and 3 CMJs. Sprint mechanics were calculated using inverse dynamic methods from sprint times, anthropometric and spatiotemporal data, whereas CMJ variables were obtained from in-ground force plates. Associations between sprint mechanics, sprint performance, and CMJ variables were identified using Pearson's correlation coefficient. A p-value of <0.036 was considered statistically significant for all analyses after performing Bonferroni correction adjustment. Relative peak running power was significantly correlated (p < 0.036, r = −0.781 to −0.983) with sprint split times across all distances (5–40 m). Relative maximum horizontal force significantly correlated with acceleration performance (0–20 m, p < 0.036, r = −0.887 to −0.989). Maximum running velocity was significantly correlated (p < 0.036, r = −0.714 to −0.970) with sprint times across 20–40 m. Relative peak force in the CMJ was significantly associated (p < 0.036, r = −0.589 to −0.630) with sprint kinetics (power and horizontal force) and 5–20-m sprint times. Jump height and concentric time in the CMJ were significantly (p < 0.036) correlated with sprint time at 20 m (r = −0.550 and r = 0.546), respectively. These results indicate emphasis should be placed on training protocols that improve relative peak power, particularly in time-constrained environments such as team sports, focusing on maximal force production or maximal running velocity ability. Furthermore, associations between CMJ variables and sprint performance provide practitioners with an approach to assess sprint performance in-season, monitor training adaptations and further individualize training interventions, without requiring maximal sprint testing.