bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of leakage of volatile synthesis products on silicon carbide yield in an electrothermal fluidized bed reactor
Authors: Kuzevanov V. S. , Zakozhurnikov S. S. , Zakozhurnikova G. S. 
Published: May 2024

Objectives. To calculate the effect of leakage of volatile synthesis products on silicon carbide yield in an electrothermal fluidized bed reactor, as well as to develop a general model of the synthesis of finely divided silicon carbide. This will be achieved by particularizing a mathematical model of leakage of volatile products of chemical reactions from the reaction volume of the reactor with the fluidizing inert gas.Methods. As a method to produce silicon carbide, synthesis in an electrothermal fluidized bed was studied. The model of leakage of volatile products was validated by comparing the calculation results with existing experimental data on the SiC synthesis in a hightemperature fluidized bed reactor. The comparison parameters were: mass yield of silicon carbide, and the total synthesis time in a reactor with batch loading of silicon dioxide into the reaction volume.Results. The value of the parameter p in the general model of SiC synthesis in a fluidized bed was established. The parameter p is equal to the ratio of the number of carbon-containing particles involved in the formation of SiO, to the total number of silicon dioxide particles. It also characterizes the composition of stable complexes of particles of the charge at various operating temperatures of the fluidized bed. The discrepancy between the calculated and experimental values of the masses of the synthesized silicon carbide was shown not to exceed 15.5% at a high temperature of the fluidized bed (T = 1800°C) and decreases with a decrease in the operating temperature to 4.7% at T = 1450°C.Conclusions. The general computational model for silicon carbide synthesis with a built-in procedure for calculating the leakage of volatile products of chemical reactions enables the variants of SiC production in electrothermal fluidized bed reactors to be analyzed. In this case, it is important to establish an energy-efficient working cycle without preliminary expensive experimental studies.
Theoretical foundations of the development of cognitive activity and self-education of students in the process of studying at a music institution
Authors:   Alikhan Bokeikhan University, Tulenbayeva K.M. , Iskakova M.O. ,   Alikhan Bokeikhan University, Seyitkazy P.B. ,   L.N. Gumilyov Eurasian National University, Lekerova А.А. ,   Alikhan Bokeikhan University
Published: May 2024

The article is aimed at examining the development of cognitive activity and self-education of students of a higher educational institution with a musical orientation of training, traditional performance art with accordion accompaniment, in particular. The observation of these concepts is preceded by an analysis of the opinions of researchers who have studied a similar issue from variety of aspects. The work provides a vast range of expert views on similar notions and individual aspects of their analysis. First and foremost, the theme of self-education of students is reviewed from the standpoint of determining an active development of individuality by means of autodidactic processes, which is widely considered and explored as a science of self-education in research community. In the frames of this concept, the given topic of self-education and development of cognitive activity among music students is discussed from the perspective of artistic and creative self-development. Creativity is presented as a core of self-education. In addition, the article captures fundamental constituents of developing cognitive activity and self-education of students, such as components of motivational-value, personal activity, and personal development. Additional attention is paid to their criteria, indicators and electivity in the given research with justifications. In the studying of personal development component, two directions of evolution of student abilities are defined: artistic-communicative and artistic-creative elements as basis of learning students’ self-development.	The authors characterise stages of independent creative work of music students as example of music-making (activates development of musical ear and author’s own performance on a musical instrument), reading from a music sheet and transposing music (activates musical and intellectual resources, helps in solving auditory, motor-technical and artistic-imaginative tasks), as well as conceptual learning of musical material. The authors also pay attention to the professionalism of the teacher in the development of the aforementioned concepts.
Analisa Keberlanjutan Usaha Tani Kopi Rakyat di Nagari Tabek Sirah Kecamatan Talamau
Authors: Zudri Fatardho , Afner Synthia Ona Guserike , Marta Andrik , Eviza Andi 
Published: May 2024

Nagari Tabek Sirah, Kecamatan Talamau merupakan salah satu Nagari menghasilkan kopi rakyat dengan luasan mencapai 80ha dari total luasan yang ditanamai kopi 899ha. Produksi kopi dan harga kopi baik di nasional ataupun internasional dapat memberikan pengaruh yang signifikan terhadap keberlanjutan usahatani kopi rakyat. Kebutuhan kopi semakin meningkat dengan perubahan gaya hidup. Mutu dan kualitas kopi menjadi nilai jual suatu produk. Tujuan Penelitian mendapatkan informasi keberlanjutan dan mendapatkan indikator yang dapat meningkat usahatani rakyat di Nagari Tabek Sirah Kabupaten Pasaman Barat. Penelitian ini menggunakan kuesioner, dengan sampel pengamatan 30 orang petani usaha tani kopi dan pihak terkait dalam pengambilan data. Metode survey dan secara sengaja (purposive)menjadi metode penelitian. Dimensi ekologi, sosial dan kelembagaan, ekonomi dan teknologi yang akan dilakukan simulasi dan dianalisis dengan menggunakan program Rapfish yang telah dimodifikasi. Hasil analisis berdasarkan simulasi Rapfish terhadap keberlanjutan usaha tani kopi rakyat Nagari Tabek Sirah adalah 40,87%. Nilai rata-rata keberlanjutan menunjukkan kurang berkelanjutan sehingga diperlukan perbaikan dengan skala prioritas terhadap indikator yang sensitif yang ada dalam masing-masing dimensi. Ekologi yaitu sistem pemeliharaan tanaman kopi, ketinggian tempat, kesesuaian tata guna lahan, tingkat pemanfaatan lahan, peralatan pengolahan lahan, pengelolaan lahan, Ekonomi yaitu kontribusi terhadap pendapatan petani, kelayakan finansial, Sosial yaitu keanggotaan kelompok tani, Kelompok tani perkebunan, umur pekerja yang berkerja di bidang perkebunan kopi, frekuensi penyuluhan dan pelatihan. Teknologi yaitu teknis pengeringan kopi, pengendalian hama dan penyakit, pemangkasan pada tajuk tanaman, sortasi terhadap biji kopi, pemecahan kulit buah dan pelepasan kulit tanduk.
Reconstructing the Spectrum of a Polyharmonic Signal under Slow Fluctuations in the Sampling Period
Authors: Monakov A. A. 
Published: May 2024

Introduction. Polyharmonic signals with a line spectrum are often encountered in practical problems. Among the examples are signals from sensors monitoring rotating elements of mechanical systems, heart rate signals, or signals of radio systems with pulse-to-pulse repetition-period staggering. Due to instable frequencies of the signal harmonics or due to fluctuations in the sampling period, the line spectrum is disrupted. These distortions can be considered as a consequence of changes in the local time scale of the processed signal. This interpretation makes it possible to use scale-invariant transforms to reconstruct the signal spectrum. Methods for reconstructing the spectrum of a signal, the sampling moments of which are unknown a priori, are based on a preliminary reconstruction of the signal and subsequent estimation of its spectrum. Existing algorithms for reconstructing a signal sampled on an uneven time grid with unknown nodes are characterized by a high computational complexity due to their iterative nature and reliance on optimization search methods.Aim. To synthesize a non-iteration algorithm for reconstructing the spectrum of a polyharmonic discrete signal under the assumption of slow changes in the sampling period.Materials and methods. To solve the problem, the digital Lamperti transform is implemented. The quality assessment of the proposed algorithm is realized via computer simulation using a test signal known from the literature on the digital spectral analysis.Results. The conducted computer simulation of the proposed algorithm has proven its feasibility. The line structure of the test signal spectrum, which was distorted by slow changes in the sampling period with an amplitude of 20 % of the mean value of the sampling period, was completely restored. Errors of the frequency and power estimates of individual signal harmonics exhibit values comparable with those derived from the spectrum estimate when the signal is evenly spaced. The error in estimating the sampling period comprised 5 % of its mean value.Conclusion. A new iteration free algorithm for reconstructing the line spectrum of a discrete polyharmonic signal is proposed. The algorithm uses the scale invariant Lamperti transform. The synthesized algorithm can be used in a simple iterative procedure to estimate changes in the sampling period.
Measuring the Elevation Angle of an Airborne Object by Phase Direction Finding in a Multi-Ring Antenna Array
Authors: Aleshkin A. P. , Vladimirov V. V. , Chestnykh A. V. 
Published: May 2024

Introduction. Radar stations for surveillance of airborne objects operating in the shortwave range are characterized by a number of limited technical characteristics, one of which is the azimuth viewing sector. The use of a linear antenna array (AR) as a receiving array provides the viewing angle of only up to 60°. When modernizing the station, this limitation was removed by applying an AR with a ring structure (currently a multi-ring AR is used). In practice, after performing a number of spatial processing algorithms, the operator obtains the azimuth, range, and speed of the observed object. However, due to the peculiarities of shortwave signal propagation, the accuracy of measuring these parameters does not ensure stable tracking of airborne objects. The use of multi-ring ARs also allows the elevation angle to be measured with a subsequent calculation of the height of the object.Aim. Analysis of the phase distribution of the incident wave at the aperture of a multi-ring AR, as well as spatial processing of the received signal using the phase direction finding method to improve the accuracy of elevation angle measurements.Materials and methods. Computer simulation in the MATLAB environment was carried out to form phase distributions on the elements of a multi-ring array, to calculate the elevation angle using the phase method, and to form portraits of the surveyed object. This environment has been successfully used to solve a wide range of problems of varying complexity in both industry and research fields.Results. The possibility of using the phase method of direction finding of a radiation source to improve the accuracy of elevation angle measurement is demonstrated based on the conducted computer simulation. The obtained results were verified on the example of surveying an airborne object by a shortwave radar station.Conclusion. The results obtained proved the relevance of using the phase method when performing spatial signal processing by a shortwave radar station. The proposed method made it possible to eliminate the ambiguity in measuring the elevation angle and to increase the accuracy of its determination, which is a new result in relation to the systems under consideration.
Analysis of some trends of the pharmaceutical market of rodenticides in Ukraine and the peculiarities of their use for deratization
Authors: Derkach I. M. , Derkach S. S. , Zhuk Y. V. , Solomon V. V. , Chepurnyj D. O. , Bosa Y. P. 
Published: May 2024

One of the most relevant zoocides are rodenticides used to control harmful rodents. Carrying out effective deratization measures on the territory of Ukraine is especially important nowadays during the Russian-Ukrainian war. According to the reports of Ukrainian servicemen and civilians in the de-occupied territories, the population of rodents is extremely large, and not all modern rodenticide drugs lead to the death of harmful animals of these species. However, the toxicological characteristics of rodenticides take into account the fact that they can poison non-target animals. The purpose of our study was to analyze the pharmaco-toxicological characteristics of rodenticides and the main trends in the pharmaceutical market of drugs of this group registered in Ukraine as of January 1, 2024. It has been established that bromadiolone (77 %) and brodifacoum (23 %) are the main active substances in modern deratization agents. They belong to second-generation anticoagulants with a chronic mechanism of action. All registered rodenticides are produced in Ukraine and are available in various dosage forms. The low effectiveness of rodenticides can be due to falsification of starting substances for the synthesis of rodenticides, inconsistency of the required content of active substances, development of resistance of rodents to poisonous substances, etc. It is expected that the results highlighted in the article will indicate further directions in the development of new rodenticides and/or increase the effectiveness of the generally accepted scheme of deratization. In Ukraine, in the conditions of the Russian-Ukrainian war and in the post-war period, these questions are among the most significant, which scientists, pharmacologists and toxicologists, pharmacists and industry manufacturers should work on.
PENGARUH PROMOSI DAN HARGA TERHADAP KEPUTUSAN PEMBELIAN BUKU DI PT YUDHISTIRA CABANG LUBUKLINGGAU
Authors: Marliza Yayuk , Syafitri Anggia 
Published: May 2024

Penelitian ini untuk mengetahui pengaruh harga terhadap keputusan konsumen di PT Yudhistira Cabang Lubuklinggau. Metode yang digunakan adalah metode kuisioner yaitu promosi dan harga terhadap keputusan konsumen. Rumusan masalah dalam penelitian ini adalah apakah Promosi dan Harga memiliki pengaruh terhadap Keputusan Konsumen di PT Yudhistira Cabang Lubuklinggau. nilai thitung adalah sebesar 2,70 dan ttabel adalah sebesar 1,669. tingkat signifikan = 0,000< (α ) 0.05, df (n-2) 50 – 2 = 48 adalah sebesar 1,669 Sehingga dengan demikian bahwa thitung > ttabel. Dan dapat ditarik kesimpulan bahwa Ha diterima, sehingga terdapat pengaruh yang signifikan Promosi terhadap keputusan konsumen PT. Yudistira Cabang Lubuklinggaunilai R Square atau koefisien determinasi sebesar 0,42 berarti bahwa varian Keputusan konsumen dijelaskan oleh Promosi dan Harga dapat mempengaruhi keputusan konsumen konsumen sebesar 42%. Dan sisanya (100 – 42) 58%. nilai Fhitung = 41 sedangkan Ftabel = 3,30 dan tingkat kemaknaan secara simultan signifikansinya adalah 0,000 < (α) = 0,05, df = n – k = 50- 2 – 1 = 57 adalah sebesar 41 sehingga Ho ditolak dan Ha diterima. artinya menunjukkan bahwa secara (simultan) variabel bebas X1(Promosi) dan X2 (Harga) memiliki pengaruh signifikan terhadap Y (keputusan konsumen konsumen) jadi bukti kebenarannya dan hipotesisnya dapat diterima PT. Yudistira Cabang Lubuklinggau.
Methods and Datasets for Feature-based query refinement collection
Authors: Tamannaee Mahtab 
Published: May 2024

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<p>With the massive and fast-growing amount of information on the Web, maintaining the effectiveness of Information Retrieval (IR) is a real challenge. The system in charge of online search must be able to search through billions of documents stored on millions of devices (Manning Christopher D et al., 2010). Traditional information retrieval systems try to sort out the input queries by mostly emphasizing on lexical similarity and exact term matching between query and documents using frequency-based methods. In other words, the relevancy of a query to a document is viewed based on the closeness of the distribution of words in a candidate document to the query. Since the lexical content of the optimal response is not usually known to the user, the user formulates a query with vocabulary that may have minimal overlap with the vocabulary appearing in its optimal document. Low overlap between query and document vocabulary is called term mismatch which emerges in retrieval results as poor recall performance. The term mismatch problem also has been referred to as lexical gap or lexical chasm with query on one side of the gap and documents on the other side. IR systems use different techniques to bridge the lexical chasm and solve the term mismatch problem. Many different query refinement techniques have already been developed. Given the user query, each refinement technique outputs a modified version of user’s query that can be used as an arch over the lexical gap from the query side to the document side.</p>
La brecha de género en la educación técnica
Authors: Paredes Cabezas Maribel del Rocío , Segarra Arias Álvaro Luis , Cueva García Milkar Antonio , Tanguila López Geovanna Jessica 
Published: May 2024

Introducción: En el avance social y los esfuerzos por promover la igualdad de género, persisten desigualdades, especialmente en áreas técnicas, donde la participación femenina es escasa o nula. Objetivo: Fomentar la igualdad donde todas las personas, a través de la inclusión para contribuir a la construcción de una sociedad más equitativa, innovadora y justa. Metodología: Métodos de análisis estadístico, QQPlot y T-Student. Resultados: Indican que existen un mayor número de hombres en los bachilleratos técnicos. Conclusión: Se debe implementar estrategias para garantizar la igualdad de competencias en estas figuras profesionales. Área de estudio general: Educación. Área de estudio específica: Equidad de género.
Proportion of Low Birth weight and Associated Maternal Risk Factors in a Developing Country, Bangladesh
Authors: NF Chowdhury , MJ Haque , S Hoque , AM Rashid , MT Khan , A Roy , CK Das 
Published: May 2024

Introduction: Though the health situation of Bangladesh has been improved substantially over the years, the low birth weight (LBW) rate is still pretty high. LBW has been associated with high probability of infection, malnutrition, mental deficiencies and behavioural and learning problem in later life. The principle focus of this study was to ascertain the proportion of LBW and its associated maternal risk factors identification.
Materials & methods: It was a cross-sectional type of descriptive study done at two tertiary level hospitals – Rajshahi Medical College Hospital and Islami Bank Medical College Hospital. A total of 270 mothers were interviewed within 1 month of their delivery. The purposively selected participants were asked about their socio-demographic characters and other associated factors related to birth of the babies. Weights of the babies at birth were documented from hospital records.
Result: Proportion of LBW was found 28.1% with no significant sex variation. Majority of the LBW babies were found in mothers of 15-20 years of age group. Mothers’ educational qualifications, occupations, early age pregnancy and type of pregnancy were associated significantly for LBW. Less than 37 weeks of gestational age of baby, home delivery, NVD were also significant risk factors of LBW. Residence and sex of neonate were not significantly associated with LBW.
Conclusion: Proportion of LBW in tertiary care hospitals were found 28.1%. Early maternal pregnancy, lower gestational age, higher parity, NVD and home delivery played an important role in the incidence of LBW.
TAJ 2023; 36: No-2: 207-214
Causal associations of birth body size and adult body size with systemic lupus erythematosus: a bidirectional mendelian randomization study
Authors: Peng Juan , Wang Huizi , Li Yanjuan , Dong Xudong 
Published: May 2024

ObjectiveBody size is associated with the onset of systemic lupus erythematosus (SLE). However, the evidence for this association is inconclusive. In this study, we aimed to investigate the causal relationship between body size and SLE.MethodWe performed a bidirectional Mendelian randomization (MR) analysis that utilized summary statistics sourced from genome-wide association study (GWAS) data obtained from the IEU Open GWAS project website. The inverse variance weighting (IVW) method was used to evaluate the causality, and four additional MR methods were used to supplement the IVW results. Sensitivity analyses were performed using the Cochran’s Q test, MR-Egger regression, leave-one-out analysis, and the Mendelian Randomization Pleiotropy RESidual Sum and Outlier (MR-PRESSO) global test.ResultsIn the forward direction analysis, the IVW model demonstrated that birth weight (odds ratio (OR), 1.811; 95% confidence interval (CI), 1.174–2.793; p &lt; 0.05) and adult height (OR, 1.225; 95% CI, 1.046–1.434; p &lt; 0.05) were positively associated with SLE. Four additional MR scans were performed parallel to the IVW results. Conversely, SLE was a weak causal factor for increased height (OR, 1.010; 95% CI, 1.002–1.018; p &lt; 0.05) using the IVW method. Heterogeneity, MR-Egger intercept, and leave-one-out analyses indicated that the results were robust. The MR-PRESSO suggested the presence of pleiotropy. Following the exclusion of instrumental variables (IVs) inducing pleiotropy, subsequent MR analysis yielded consistent results, thereby reinforcing the robustness of our findings.ConclusionPositive causal associations were observed between birth weight, adult height, and SLE incidence. In the reverse analysis, SLE was a weak causal factor for adult height.
Experimental validation of auxetic stent designs: three-point bending of 3D printed Titanium prototypes
Authors: Vellaparambil Rahul , Han Woo-Suck , Di Giovanni Pierluigi , Avril Stéphane 
Published: May 2024

IntroductionNumerical simulations have demonstrated the superior bending flexibility of auxetic stents compared to conventional stent designs for endovascular procedures. However, conventional stent manufacturing techniques struggle to produce complex auxetic stent designs, fueling the adoption of additive manufacturing techniques.MethodsIn this study, we employed DMLS additive manufacturing to create Titanium Ti64 alloy stent prototypes based on auxetic stent designs investigated in a previous study. These prototypes were then subjected to experimental three-point bending tests.ResultThe experimental results were replicated using a finite element model, which showed remarkable accuracy in predicting the bending flexibility of four auxetic stents and two conventional stents.DiscussionAlthough this validation study demonstrates the promising potential of DMLS and other additive manufacturing methods for fabricating auxetic stents, further optimization of current stent design limitations and the incorporation of post-processing techniques are essential to enhance the reliability of these additive manufacturing processes.