bluuebunny/crossref_metadata_2025_split huggingface dataset:
DEVELOPMENT OF METHODS OF POSITIONING, LOCALIZATION AND DATA COLLECTION FROM NODES OF A FREE MOBILE SENSOR NETWORK USING INTELLIGENT ADAPTIVE TELECOMMUNICATION AEROPLATFORMS
Authors: Romaniuk Valery , Lysenko Olexandr , Novikov Valery , Sushyn Ihor 
Published: December 2021

Background. The article presents the results of a study of methods of positioning, localization and data collection from nodes of a mobile wireless sensor network using intelligent adaptive telecommunication air platforms. To implement the study of this research topic, an analysis of literary sources on this topic was carried out. Based on a fairly rich bibliographic material, this work has the main task of examining, analyzing and systematizing already known approaches to positioning objects in wireless sensor networks using intelligent adaptive telecommunication air platforms and suggesting options for their development.
Objective. The aim of the work is to improve the methods of direct data collection of TA from the nodes of BSM, the general directions of synthesis of which are defined in the work.
Methods. Methods of cluster analysis (network clustering), graph theory (research of analytical models of BSM with TA functioning, construction of cluster topology), theory of telecommunication networks (when calculating bandwidth in BSM with TA radio channels) and theory were used to solve the formulated problem. (when developing a positioning model for telecommunications air platforms)
Results. A technique for evaluating the effectiveness of methods for collecting data from wireless sensor networks using intelligent adaptive telecommunication air platforms is proposed.
Conclusions. The method of collecting TA monitoring data from the main nodes of clustered BSM has been improved. The method of estimation of efficiency of methods of data collection with BSM by telecommunication air platforms is offered.
Control the Frequency Response of a Loudspeaker by Changing Its Enclosure
Authors: Riabokon Pavlo Olehovych 
Published: December 2021

This article analyzes how to control frequency response of a loudspeaker by changing the volume of its closed-box enclosure. The calculation is performed by the method of Thiele-Small on the basic of a pre-calculated loudspeaker, the parameters of which are given in third section. This became possible because of the simplification of the circuit on figure 1 to the form of circuit on figure 2. This allowed us to consider it as a second order filter (presence of two reactive elements). Obtained results are compared with corresponding characteristics of open-box enclosure of the same loudspeaker, that was pre-calculated by the author too. Results are presented graphically in figure 3 and 4. As can be seen from them, the resonant frequency of the loudspeaker in the closed-box enclosure is higher than the resonant frequency of the loudspeaker in the open box. The result in the form of a ratio is listed in table 2. Analyzing the obtained data, it can be noticed that with the change of the internal volume of the closed box (and hence its total quality factor), it is possible to affect both the resonance frequency and the peak amplitude values in these frequencies by changing the FR. The result shown in figure 3 and 4 is achieved by taking into account effect of radiation only on the one side of the driver (in the case of open-box enclosure). Closed box was calculating by taking into account both sides radiation of the driver.
Shifting the resonance frequency of the system towards higher frequencies and increasing the sound pressure on the resonance generally worsens the FR of the loudspeaker (reduces the reproduction of low-frequency components of sound and increases the unevenness of the frequency). However, certain variants of this group of frequency characteristics may be useful depending on the reproducible frequency range and need of emphasize the low-frequency components (for example, in rock music). If you need a smoothed low-frequency sound, it is appropriate to use systems with low overall quality and increased internal volume or open-box enclosure.
Therefore, the volume of the closed-box enclosure significantly affects the resonant frequency and the shape of the frequency response of the loudspeaker. Reducing the volume of the enclosure of the loudspeaker leads to a decrease in its frequency range due to low frequencies and at the same time increase in the unevenness of the frequency response. The change in the resonant frequency of the system as the volume of the closed-box enclosure decreases, the less the volume of the closed-box.
Keefektifan Model Problem Based Learning Berbantuan Video dalam Liveworksheets Terhadap Kemampuan Pemecahan Masalah Matematis Siswa
Authors: Haqiqi Arghob Khofya , Syarifa Sabila Nurus 
Published: December 2021

<p class="07KatakunciKeywords"><span lang="EN-US">Penelitian ini dilatarbelakangi karena rendahnya kemampuan siswa dalam memecahkan masalah dalam pembelajaran matematika. Oleh karena itu, untuk mengatasi masalah tersebut dilakukan penelitian dengan model <em>Problem-Based Learning</em> (PBL) berbantuan video dalam <em>liveworksheets</em><em>.</em> Penelitian ini menggunakan metode eksperimen kuasi dengan desain penelitian <em>pretest-posttest control group design.</em> Populasi dalam penelitian ini terdiri dari kelas X TKR 1 - X TKR 3 pada salah satu Sekolah Menengah Kejuruan (SMK) di Kudus. Pemilihan sampel menggunakan <em>teknik cluster random sampling </em>didapatkan kelas X TKR 2 sebagai kelas eksperimen dan X TKR 3 sebagai kelas kontrol. Hasil pelaksanaan pembelajaran kelas eksperimen yang dimulai dengan pemberian masalah menunjukkan adanya peningkatan kemampuan pemecahan masalah matematis. Selain itu uji N gain menunjukkan peningkatan skor kelas eksperimen sebesar 63%, sedang kelas kontrol sebesar 49%. Berdasarkan pelaksanaan dan hasil analisis maka dapat disimpulkan model <em>problem-based learning</em> berbantuan video dalam <em>liveworksheets</em> efektif dengan kategori sedang.</span><span lang="EN-US">Temuan ini mengindikasikan bahwa model PBL berbantuan video dalam <em>liveworksheets</em><em> </em>dapat dijadikan alternatif model pembelajaran untuk mengembangkan kemampuan pemecahan masalah matematis siswa.</span></p><p class="07KatakunciKeywords"> </p><p class="06IsiAbstrak">This research is motivated by the low ability of students to solve problems in learning mathematics. Therefore, to overcome this problem, research was carried out using a video-assisted Problem-Based Learning (PBL) model in live worksheets. This study uses a quasi-experimental method with a pretest-posttest control group design. The population in this study consisted of class X TKR 1 - X TKR 3 at one of the Vocational High Schools in Kudus. The sample selection using cluster random sampling technique obtained class X TKR 2 as the experimental class and X TKR 3 as the control class. The results of the implementation of the experimental class learning which began with giving problems showed an increase in mathematical problem-solving abilities. In addition, the N-gain test showed an increase in the score of the experimental class by 63% while the control class was 49%. Based on the results of the implementation and analysis, it can be concluded that the video-assisted problem-based learning model on student worksheets is effective in the medium category. These findings indicate that the video-assisted PBL model in live worksheets can be used as an alternative learning model to develop students' mathematical problem-solving abilities.</p>
Adherence to Social-Distancing and Personal Hygiene Behavior Guidelines and Risk of COVID-19 Diagnosis: Evidence From the Understanding America Study
Authors: Andrasfay Theresa , Wu Qiao , Lee Haena , Crimmins Eileen M. 
Published: December 2021

Objectives. To assess the association between individual-level adherence to social-distancing and personal hygiene behaviors recommended by public health experts and subsequent risk of COVID-19 diagnosis in the United States. Methods. Data are from waves 7 through 26 (June 10, 2020–April 26, 2021) of the Understanding America Study COVID-19 survey. We used Cox models to assess the relationship between engaging in behaviors considered high risk and risk of COVID-19 diagnosis. Results. Individuals engaging in behaviors indicating lack of adherence to social-distancing guidelines, especially those related to large gatherings or public interactions, had a significantly higher risk of COVID-19 diagnosis than did those who did not engage in these behaviors. Each additional risk behavior was associated with a 9% higher risk of COVID-19 diagnosis (hazard ratio [HR] = 1.09; 95% confidence interval [CI] = 1.05, 1.13). Results were similar after adjustment for sociodemographic characteristics and local infection rates. Conclusions. Personal mitigation behaviors appear to influence the risk of COVID-19, even in the presence of social factors related to infection risk. Public Health Implications. Our findings emphasize the importance of individual behaviors for preventing COVID-19, which may be relevant in contexts with low vaccination. (Am J Public Health. 2022;112(1):169–178. https://doi.org/10.2105/AJPH.2021.306565 )
Finite Volume Simulations of Particle-laden Viscoelastic Fluid Flows: Application To Hydraulic Fracture Processes
Authors: Fernandes C. , Faroughi S. A. , Ribeiro R. , Isabel A. , McKinley G. H. 
Published: December 2021

Abstract
Accurately resolving the coupled momentum transfer between the liquid and solid phases of complex fluids is a fundamental problem in multiphase transport processes, such as hydraulic fracture operations. Specifically we need to characterize the dependence of the normalized average fluid-particle force < F > on the volume fraction of the dispersed solid phase and on the rheology of the complex fluid matrix, parameterized through the Weissenberg number Wi measuring the relative magnitude of elastic to viscous stresses in the fluid. Here we use direct numerical simulations (DNS) to study the creeping flow (Re << 1) of viscoelastic fluids through static random arrays of monodisperse spherical particles using a finite volume Navier-Stokes/Cauchy momentum solver. The numerical study consists of N = 150 different systems, in which the normalized average fluid-particle force <F> is obtained as a function of the volume fraction φ (0 < φ ≤ 0.2) of the dispersed solid phase and the Weissenberg number Wi (0 ≤ Wi ≤ 4). From these predictions a closure law < F >( Wi,φ ) for the drag force is derived for the quasi-linear Oldroyd-B viscoelastic fluid model (with fixed retardation ratio β = 0.5) which is, on average, within 5.7% of the DNS results. Additionally, a flow solver able to couple Eulerian and Lagrangian phases (in which the particulate phase is modeled by the discrete particle method (DPM)) is developed, which incorporates the viscoelastic nature of the continuum phase and the closed-form drag law. Two case studies were simulated using this solver, in order to assess the accuracy and robustness of the newly-developed approach for handling particle-laden viscoelastic flow configurations with O (10 5 − 10 6 ) rigid spheres that are representative of hydraulic fracture operations. Three-dimensional settling processes in a Newtonian fluid and in a quasi-linear Oldroyd-B viscoelastic fluid are both investigated using a rectangular channel and an annular pipe domain. Good agreement is obtained for the particle distribution measured in a Newtonian fluid, when comparing numerical results with experimental data. For the cases in which the continuous fluid phase is viscoelastic we compute the evolution in the velocity fields and predicted particle distributions are presented at different elasticity numbers 0 ≤ El ≤ 30 (where El = Wi/Re ) and for different suspension particle volume fractions.
Development and Validation of a Competency-Based Education Model Suitable for Undergraduate Human Nutrition and Dietetics Training in Uganda: A Modified Delphi Process
Authors: Kikomeko Peterson Kato , Ochola Sophie , Kaaya Archileo N. , Ogada Irene , Birungi Tracy Lukiya , Nakitto Peace 
Published: December 2021

Abstract
Background

Competency-based education (CBE) equips health professionals with the requisite competencies for health systems performance. This study aimed to develop and validate a CBE model suitable for teaching Human Nutrition/Human Nutrition and Dietetics (HN/HND) at the undergraduate level in Uganda.
Methods

The study was undertaken in two main phases, (1) competency needs assessment and (2) model development and content validation. The later had three iterative stages: a needs assessment results validation workshop; an expert focus group discussion to develop a draft CBE model framework; and consensus development-itself undertaken in two modified Delphi rounds to ascertain participant consensus on the relevance and suitability of the competency domains, subdomains, and statements comprised in the developed draft CBE framework for undergraduate HN/HND training in Uganda. In the modified Delphi process, participants indicated the degree to which they agreed or disagreed with each of the given statements on five-point Likert-type items of strongly disagree, disagree, neither agree nor disagree, agree, and strongly agree as well as the level of training they recommended the given competency statement to be learned. The workshop had 31 participants, the focus group eight, while the first and second Delphi rounds had 70 and 55 participants respectively.
Results

In total, seven competency domains, 24 subdomains, and 190 competency statements were developed. Content analysis and analysis of percentage responses for each competency statement were done with participant consensus set at ≥80%. All the seven domains (100%); 22 (91.7%) of the 24 subdomains; and 153 (87.9%) of the 174 analysed competency statements were evaluated as both relevant and suitable for undergraduate HN/HND training and hence included in the validated CBE model.
Conclusion

This study evaluated the relevancy and suitability of seven competency domains prevention and management of malnutrition; nutrition in the lifecycle; food security, food safety, agriculture, and livelihoods promotion; ethics and professionalism in nutrition and dietetics; research and data analysis; policy, advocacy, and social and behaviour change communication; and nutrition leadership and management for undergraduate HN/HND training in Uganda. The study recommends translating the developed CBE model into a standard curriculum that can be taught and evaluated.
MPPT Based On Artificial Neural Networks (ANN) For a Photovoltaic System Under Unstable Environmental Conditions
Authors: Nkounhawa Pascal Kuate , Ndapeu Dieunedort , Kenmeugne Bienvenu 
Published: December 2021

Abstract
In this article, an artificial neural networks (ANN) based maximum power point tracking controller (MPPT) was developed to improve the performance of the FL-M-160W solar panel under unstable environmental conditions. To develop and configure the neural controller, a database resulting from experimental tests was built for the training of the proposed model. Then the model was tested and validated under the Matlab / Simulink environment. The optimum voltage obtained at the output of the neural controller is compared to the voltage of the photovoltaic generator and the error is used to modify the duty cycle of the DC-DC boost converter. It is shown after simulations that unlike conventional controllers which are very slow, the neural MPPT controller offers more stable, more accurate output characteristics with very low response time and very low oscillations around the operating point both in transient and steady state, even under varying environmental conditions.
An Investigation of Strontium Doped Erbium Oxide Nanoparticles for Enhanced Photocatalytic Degradation of Organic Pollutants in Aqueous Solution
Authors: KANDASAMY BHUVANESWARI , Susselaa Sreeja Balakrishnapillai , Sankararajan Radha , Govindasamy Palanisamy , Thangavelu Pazhanivel , Shanmugam Vignesh , Nagaraj Elavarasan , Govindaraj Venkatesh , Manickam Srinivasan , Perumalsamy Ramasamy 
Published: December 2021

Abstract
A simple wet impregnation approach had been used to the successful preparation of different weight percentages of strontium/niobium doped Er2O3 nanoparticles. The X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), high resolution transmission electron microscope (HR-TEM), Fourier transformed infrared spectroscopy (FTIR), and UV-visible (UV) spectroscopy was used to analyze the samples as they were prepared. With Sr and Nb doping at Er2O3 nanoparticles, the XRD patterns intensity was shifted, and its positioning was also shifted as weight percentages of doped were increased. Similarly, the lattice d spacing values were also decreased. According to HR-TEM images, Er2O3 seems to have a two-dimensional hexagonal nanoplate-like structure as well as being a few nm in size. The photocatalytic activities of pristine and Sr/Nb doped samples were evaluated against the methyl orange (MO) and rhodamine B (Rh B) dyes under UV-visible light irradiation. Within seventy-five minutes of UV-Visible light irradiation, the five-weight percentage of Sr doped Er2O3 nanoparticles shows significantly enhanced photocatalytic degradation efficiency against Rh B dye. The synergistic effect of the strong metal-support interaction between the Sr and Er2O3 nanoparticles could be attributed to the improved photocatalytic activity of the prepared samples. The cyclic stability and radical trapping experiments were also investigated against the same reaction conditions.
Knowledge, Attitudes, And Practices Towards Cancer Pain Management Amongst Healthcare Workers (Physicians, Pharmacists, And Nurses): A Cross-Sectional Study From First-Tier Cities in China
Authors: Xie Jiyi , Zhang Cong , Li Shijun , Dai Rong , Deng Bin , Xu Qiling , jinglin Wang , Shi Chen , Zhang Yu 
Published: December 2021

Abstract
Purpose China is currently one of the countries with the largest increased number of new cancer cases in the world, but cancer pain management (CPM) is still inadequate. This study, through a questionnaire designed to show the knowledge, attitudes, and practices (KAP) status and differences towards CPM among healthcare workers (HCWs) in developed areas of China and explore areas and advantages of the role of pharmacists and mobile devices.Methods This study used data from a questionnaire on CPM from March to June 2019. The study population consisted of a total of 515 HCWs in four first-tier developed cities in China. The questionnaire has four major components, analysis of differences in KAP of different occupations through one-way analysis of variance (ANOVA).Results Among the respondents, the physicians had the highest knowledge scores towards CPM, pharmacists had the lowest practice scores. Around half of the respondents indicated that their hospital or department have a pharmacist participating in CPM. Physicians, and nurses were more likely to expect pharmacists to provide drug counseling. The HCWs interviewed most expect that the mobile-based pain management system can automatically screen and mark patients with pain.Conclusion From this study, it can be suggested that pharmacists and nurses in the CPM team should actively promote relevant knowledge. Besides, pharmacists should focus on improving practical ability such as increasing the frequency of pain assessment. Multidisciplinary collaboration and the introduction of mobile devices can improve and refine the CPM.
Environmental Impacts, Human Health, and Energy Consumption of Nitrogen Management for Maize Production in Subtropical Region
Authors: Yao Zhi , Zhang Wushuai , Wang Xingbang , Lu Ming , Zhang Wei , Liu Dunyi , Gao Xiaopeng , Chen Yuanxue , Chen Xinping 
Published: December 2021

Abstract
Over-application of fertilizers could not improve crop yield and agronomic efficiency, but result in increasing nitrogen (N) surplus and adverse effects on the ecosystem sustainability. Although some previous studies have addressed one or a few environmental aspects in crop production, an integrated assessment for the effects of N fertilizer on multiple environmental impacts, and the optional steps of normalization and weighting is required. A consecutive 2-yr plot-based field experiment was conducted with five N fertilizer levels (0, 90, 180, 270, and 360 kg N ha-1) in maize production at three sites in Southwest China, to evaluate the environmental performance and sustainability through joint use of life cycle assessment (LCA) and energy consumption analysis. Results demonstrated that the optimal N rate (180 kg N ha-1) showed greater potential for maintaining high yield (achieved 86% of the yield potential) and reducing the global warming (-31%), acidification (-47%), eutrophication (-44%) compared to farmers’ practice, and energy depletion potentials, by reducing pollutants emission during the production and transportation of N fertilizer and Nr losses at farm stage. Optimal N treatment indirectly reduced the land use, life-cycle human toxicity, aquatic eco-toxicity, and terrestrial eco-toxicity potentials by improving grain yield and agronomic efficiency. In addition, the optimal N treatment reduced the energy consumption by enhancing the energy use efficiency (EUE) (+74%) and reducing non-renewable energy form (-45%) than the farmer’s practice. This study will provide comprehensive information for both scientists and farmers involved in maize production and N management in subtropical region.
Gaps in the Congenital Syphilis Prevention Cascade: Qualitative Findings from Kern County, California
Authors: Park Eunhee , Yip Julie , Harville Emily , Nelson Marlene , Giarratano Gloria , Buekens Pierre , Wagman Jennifer 
Published: December 2021

Abstract
Background. Congenital syphilis is preventable through timely access to prenatal care, syphilis screening and treatment of pregnant women diagnosed as infected. In 2018, California had the second highest number of congenital syphilis cases in the United States (U.S.), a nearly 2-fold increase in cases since 2014. This study assessed gaps in preventing congenital syphilis in the high morbidity region of Kern County, California. Methods. Between May 2018 and January 2019, we conducted five focus group discussions with pregnant/postpartum women and ten semi-structured interviews with prenatal care providers in Kern County. Focus group and interview data were recorded, transcribed, and analyzed to identify emergent themes pertaining to facilitators and barriers at each step (prenatal care, syphilis screening and treatment) in the congenital syphilis prevention cascade.Results. Gaps in congenital syphilis prevention discussed in focus group discussions with pregnant/postpartum women were related to limited prenatal care access, social-, economic-, and cultural-barriers, and substance use and co-occurring intimate partner/domestic violence. The gaps identified from interviews with prenatal care providers included social economic vulnerabilities of pregnant women and stigma and shame around the vulnerabilities, distrust in medical system, prenatal substance use, limited prenatal substance use disorder treatment facilities, and inadequate provider training on context-specific congenital syphilis management strategies. Gaps in partner notification, screening and treatment for syphilis were brought up by pregnant/postpartum women and prenatal care providers. Conclusions. Congenital syphilis continues to increase in Kern County and throughout the U.S. In high syphilis morbidity areas, comprehensive and tailored public health approaches addressing setting-specific gaps in prenatal screening and treatment are needed.