bluuebunny/crossref_metadata_2025_split huggingface dataset:
Hubungan faktor sosiodemografi dengan status gizi pada anak balita
Authors: Hasyim Dzul Istiqomah , Saputri Nurwinda 
Published: August 2022

Latar belakang: Status gizi dapat dipengaruhi oleh beberapa hal, salah satunya adalah status demografi, yang meliputi jenis kelamin, umur, pendapatan keluarga, pekerjaan ayah,dan tingkat pendidikan ibu. Permasalahan gizi buruk dapat dipengaruhi oleh salah satunya asupan makanan, pola asuh orang tua, dan kebiasaan di tempat tinggal anak. Tujuan penelitian: Diketahuinya faktor sosiodemografi yang berpengaruh terhadap status gizi anak balita Metode: Menggunakan desaign analitik observasional dengan studi cross sectional. Populasi dalam penelitian sebanyak 162 responden. Sampel penelitian sebanyak 62 responden dengan menggunakan teknik purposive sampling. Instrumen menggunakan kuesioner dan data berat badan, tinggi badan. Analisis data deskriptif dan uji Chi Square. Hasil: Hasil uji chi square menunjukkan umur p value 0,527 (p0,05), jenis kelamin p value =0,223 (p0,05), tingkat Pendidikan p value =0,920 (p0,05), pekerjaan p value =0,027 (p0,05) dan pendapatan keluarga p value =0,037 (p0,05). Simpulan: Terdapat hubungan pekerjaan dan pendapatan keluarga dengan status gizi pada anak balita. Usia anak, jenis kelamin anak dan tingkat pengetahuan ibu tidak menunjukkan hubungan yang signifikan.
Експериментальні дослідження термоакустичних двигунів з двофазним робочим тілом
Authors: Korobko Volodymyr , Shevtsov Anatoliy 
Published: August 2022

A distinguishing feature of these days is the general tendency to decrease the temperature level of the waste heat of engines for power plants in industry, transport, and energy. These circumstances complicate the usage of traditional energy-saving technologies designed to transform this heat into mechanical work. Given the lack of effective technologies, large volumes of such heat emissions are lost. As an example, we can consider ship power engineering. On ships that are equipped with dual-fuel medium and low-speed engines, the thermal emissions of the cooling systems have a temperature of 355…365 K. Given the small exegetical potential, the use of such low-temperature waste energy sources by any heat engines is a difficult problem. Therefore, the task of improving existing energy-saving technologies or developing new ones remains relevant. Thermoacoustic technologies can be useful in solving this problem. A significant advantage of thermoacoustic heat machines is the ability to use any external heat source, in this case low-temperature sources, and produce mechanical work. There are known cases of thermoacoustic oscillations at small temperature differences between heat sources under conditions of high humidity of the working environment. This phenomenon can be used to create low-temperature energy-saving systems based on thermoacoustic engines (TAE) with a wet two-phase working environment. The practical use of thermoacoustic systems as part of ship power plants requires additional research to solve low-level issues, in particular, increasing the specific power of the TAE. This work provides a description of the experimental equipment, design of experimental TAE with a wet working body and research methods. The results of the experiments showed that in experimental TAEs with a two-component (moist) working environment, the temperature of spontaneous thermoacoustic oscillations was 355…359 K, while the longitudinal temperature gradient in the matrix was 1.19…1.30 K/m. The specific power of TAE with a moist environment increased by 1.7…7 times, and the acoustic pressure increased by 2…4.7 times compared to the operation in dry air. It is shown that in the existing TAEs, the condensation of water vapor in the ceramic matrix and on the surfaces of the heat exchangers can lead to a loss of power, roughly up to 25 %, while maintaining the operational capacity.
Вплив імпульсних рульових двигунів на динаміку твердопаливної ракети
Authors: Filipkovsky Sergey , Filipkovskaja Larisa 
Published: August 2022

The object of this study is a rocket with a solid propellant engine launched from a vehicle launcher. The current work studies the oscillations of a rocket airframe in flight under the influence of impulses of the steering motors and the effectiveness of flight control along the trajectory by the steering motors located in the head of the solid rocket. Analytical and numerical methods for determining the frequencies of free vibrations of a rigid body and analytical methods for integrating differential equations of motion are applied. A mathematical model of rocket flexural oscillations has been constructed. Methods for determining the modes and frequencies of natural oscillations have been analyzed. Three lower frequencies and modes of natural oscillations of the rocket were calculated. The discrepancy between the results of the calculation by the computer program and the analytical calculation of the first approximation is 3%. The calculation of oscillations of a rocket with a caliber of 30 mm and a length of 7655 mm showed that torsional and longitudinal oscillations have relatively high frequencies and have little effect on the stability and controllability of the rocket flight. The vibrations of the rocket airframe, which has a gas-dynamic flight control system with the help of rudders and a gas-jet one with the help of steering engines, are studied. Steering motors are small-sized disposable solid propellant motors, which are located in five rows around the perimeter of the rocket airframe at the head. Methods for calculating the forced oscillations of a rocket during the operation of steering engines have been developed. Under the action of the control pulse, transverse oscillations of the rocket airframe y are excited and simultaneously, the rocket rotates as a solid body around the center of mass. Airframe oscillations quickly decay, and rotation changes the pitch or slip angle. To stop the rotation and leave some required angle of inclination or azimuth of the trajectory, a second impulse of force must be given by the steering motor mounted on the opposite side of the hull. The dependence of the change in pitch and slip angles on the duration of time intervals between control pulses was studied. The analysis of the dependence obtained shows that, although the weight of the fuel charge is approximately half the weight of the rocket, the controllability by the steering engines is equally effective at any fuel consumption.
Test problem of the flow modeling in axial compressor cascades
Authors: Denisyuk Olesya , Balalaiev Anton , Balalaieva Kateryna 
Published: August 2022

The flow of gas in the flow path of a gas turbine engine (GTE) is accompanied by a rather complex phenomenon. These are a three-dimensional boundary layer, an incoming vortex, a paired vortex, flow turbulence, aerodynamic wakes behind the trailing edge, separation of the boundary layer from the blade surface, pressure pulsations, uneven and unsteady flow, secondary overflows, changes in the angles of flow exit, etc. Flow R&D of a GTE remains a rather complex process, and requires the use of reliable research methods and techniques. Nowadays, two known methods are used to study a gas flow through the flow path of a GTE ˗ experimental and calculated. Calculated, in turn, can be divided into analytical and numerical. An important stage of the numerical experiment is the solution to test problems for the possibility of setting the parameters of the numerical experiment. In this work, two test tasks were carried out. The object of the research was two compressor cascades, consisting of the identical airfoils series KR-33. The profile chord was 52 mm; the pitch cascade was 52 mm. The difference was in the installation angle of these profiles: variant 1 of the compressor cascade has an installation angle of 63.5º; variant 2 of the compressor cascade has an installation angle of 89.5º. A computational domain was constructed for each compressor cascades of airfoils and consisted of 5 million cells. Air under normal atmospheric conditions was chosen as the working fluid. The flow regime of compressor cascades varied in the range of coefficient λ = 0.26…0.9 and λ = 0.265…0.8, where the coefficient λ is the reduced velocity. The unstructured mesh method with an adaptation for the boundary layer was chosen to construct the computational mesh. Such a combination makes it possible to correctly model the flow in the boundary layer near the walls. The turbulence model SST was taken to close the Navier-Stokes equations. A comparison of the results of numerical and physical experiments for two variants of compressor cascades shows that the flow simulation error is less than 5%. Because of the calculation, the choice of this turbulence model for subsequent studies of the flow in the stages of the compressor, fan, and propfan will be justified.
Контури керування і обмеження для побудови системи автоматичного керування авіаційним газотурбінним двигуном
Authors: Tovkach Serhii 
Published: August 2022

The choice of programs and control algorithms for ACS determines the possibility of implementation in the engine of the expectancy in the construction of thermodynamic and strength characteristics. For the set modes of operation of the engine limit values of frequency of rotation of rotors of gas temperature , air pressure behind the compressor are defined; on transient modes the size and duration of exceedances by parameters of their maximum admissible values on the set operating modes is limited. The parameters of the GTE adjustment should be chosen so that they characterize the optimality and stability of the engine, as well as the level of loads on its construction. This article considers the process of construction of ACS GTE using control circuits and limitations: free turbine speed support circuit; gas temperature limiting circuit; the circuit of limitations of the resulting frequency of rotation of a rotor of the turbocharger; the circuit of limitations of "physical" frequency of turbocharger rotor rotation, etc. During the operation of each circuit, the value of the derived speed of the turbocharger rotor (minimum and maximum value) is calculated and at the same time the limitation of the fuel consumption is performed. Thus, for the gas temperature limitation circuit, the change in the coefficients allows to achieve a different nature of the temperature change at the throttle response. The value of the coefficient is limited by the value *, which provides a sufficient factor of stability of the regulator. The value was determined by the stable operation of the controller and the presence of the maximum possible delay in the full control circuit . A model with certain transfer functions in the VisSim software environment was constructed for ACS GTE in terms of speed. Measures were taken to stabilize the system: to reduce the gain of the amplifier; changing the parameters of the amplifier and the feedback link; input to the block diagram of the P-regulator system; adding a PI controller system to the circuit; adjustment of the fuzzy regulator; neuro-fuzzy learning. The quality of the system is assessed. A satisfactory reaction time of 2.36 s and an overregulation of 2 % were obtained. The astaticity of the resulting system allows you to accurately maintain the speed in static mode, which means that the system can be used where the accuracy of parameter support is essential.
Обґрунтування вибору скандію для мікролегування високоміцних алюмінієвих сплавів
Authors: Kalіnіna Natalіja , Glushkova Diana , Tsokur Natalіja , Nosova Tetjana , Bagrov Valerij , Demchenko Sergiy 
Published: August 2022

The substantiation of the scandium selection for microalloying and modifying of high-strength aluminum alloys. The research material is a high-strength aluminum alloy B96C1 of the Al-Zn-Mg-Cu system. Scandium was chosen as a microalloy and modifying element. The state diagram of Al-Sc, physical, and mechanical properties of scandium have been studied. Modes of heat treatment of B96C1 alloy with 0.3 % scandium have been developed. The structure and mechanical properties of the modified alloy were studied. The conducted complex of studies confirmed the microleveling and modifying the action of scandium in Al-melt, the technology of the introduction of scandium into melt-melt was developed, the amount of Sc was optimized. AlSc alloys have a significant effect on artificial aging. The study of the kinetics of the decomposition process showed the supersaturation of the solid solution obtained by crystallization. During the decomposition of a solid solution of scandium in aluminum, particles of the stable phase of Al3Sc are released. Based on the analysis of the Al-Sc state diagram, the homogenization temperatures of hardening and aging of the aluminum alloy B96Ts1 with optimization of the cooling rate of the workpieces were selected. In the modified blanks, grain grinding was achieved 2.5 times and the characteristics of the yield strength and yield strength of the alloy while maintaining plasticity. For aluminum alloy B96Ts1, the choice of scandium as a microalloying and modifying element is justified in terms of compliance with its physicochemical nature and properties of aluminum-based alloys. Because of hardening the alloys of the Al-Sc system, there is no decomposition of the solid solution with the release of Al3Sc intermetallic particles, which is a scientific novelty. The main effect of scandium is to increase the strength properties due to the formation of dispersed decomposition products of a solid solution of scandium in aluminum and preservation in heat-treated semi-finished products of stable structure with small subgrains. The establishment of the technology of the introduction of scan-action into the melt and temperature-time parameters of heat treatment of workpieces allowed to obtain a dispersed structure and a high set of mechanical properties of the alloy B96Ts1, which is the practical value of the work.
PERANCANGAN ARSITEKTUR E-LEARNING DAN E-LIBRARY MENGGUNAKAN THE OPEN GROUP ARCHITECTURE FRAMEWORK- ARCHITECTURE DEVELOPMENT METHOD DI STKOM AL MA’SOEM BANDUNG
Authors: Ramadhani Tiffany Puspa 
Published: August 2022

The concept of digital learning or e-learning is now widely applied in many universities. in this research is done architecture design of e-learning information system equipped with e-library as storage media of material needed in learning and also as media of search of library material which amount is not limited. The background of this architectural design is two, which is less effective teaching and learning activities when there is holiday or lecturer absence and the last is the limited number of library materials in hardcopy. E-learning and e-library as one of the impacts of information technology advances can be utilized to overcome the obstacles in STKOM Al Ma'soem. With e-learning lecturers can provide lectures without having to face-to-face with students. Whereas with the use of e-library students can get library materials online without limited space and time.
Budidaya Jamur Tiram dan Pengolahannya Sebagai Upaya Meningkatkan Ekonomi Kreatif Desa Beji
Authors: Inayah Tri , Prima Ellen 
Published: August 2022

Jamur adalah satu bahan pangan yang banyak diminati masyarakat adaah jamur, ada berbagai jenis jamur yang banyak di konsumsi masyarakat. Mulai dari jamur enoki, jamur kuping, jamur tiram dll. Jamur tiram merupakan jenis jamur yang sering dikonsumsi karena mengandung berbagai vitamin di dalamnya. Dalam jamur tiram setidaknya mengandung mineral, kalium karbohidrat dan juga vitamin B. Selain memiliki banyak kandungan, jamur tiram memiliki rasa yang cukup enak jika di konsumsi maka tak heran jika saat ini mulai banyak yang membudidayakan jamur tiram, karena meliki nilai ekonomis yang cukup tinggi. Selain itu teknik dan tahapan yang diperlukan dalam budidaya jamur tergolong tidak terlalu sulit. Untuk itu salah satu program yang dipilih untuk meningkatkan kreatifitas dan kemampuan mahasiswa KKN adalah dengan pelatihan budidaya jamur. Langkah dalam pelatihan teknis budidaya jamur tiram dimulai dengan menyiapkan bahan baku seperti serbuk gergaji, bekatul, kapur, plastik. Setelah semua bahan siap selanjutnya proses produksi
The influence of model of eliciting activities on improving mathematical problem-solving ability
Authors: Qurohman M. Taufik , Nugraha Prasetya Putra , Romadhon Syaefani Arif , Fathurrohman Ahmad Syahid 
Published: August 2022

The aims of this study is to improving problem-solving skills by combining the Model of Eliciting Activities (MEA) with Learning Model on the level of student independence. The technique used for sampling is cluster random sampling, namely by selecting two experimental classes and two control classes take one experimental class and one control class. Sample are students in grade 2A and 2B in Academic Year 2021/2022 with eigen-values material from Mechanical Engineering Study Program. In this study takes variables, namely problem-solving ability as a result with parameters i.e. with or without Model of Eliciting Activities (MEA). Data collection in unison with documentation, questionnaires, and test methods. And data processing using a two-way ANAVA 2 in unison with a 2x2 factorial design interaction as well as a determinant test using a benpheroni test. Based on the research, provide an understanding that students will gain learning in unison with the MEA get high problem-solving abilities than students Where students who get treatment with learning is carried out conventionally, and students who have a high level of comfort have high problem-solving ability results abilities compared to students who have a fairly low level of independence, so they have an influence on self-reliance and learning methods on students' problem solving Capabilities. Thus, students who have high comfort and get learning with the Eliciting Activities Model have a higher problem-solving ability compared to other types of learning interactions in this study.
Influence of sire fertility status on conceptus-induced transcriptomic response of the bovine endometrium
Authors: O’Callaghan E. , Sánchez J.M. , Rabaglino M.B. , McDonald M. , Liu H. , Spencer T.E. , Fair S. , Kenny D.A. , Lonergan P. 
Published: August 2022

The aim was to examine the effect of sire fertility status on conceptus-induced changes in the bovine endometrial transcriptome. To generate elongated conceptuses, Day 7 blastocysts produced in vitro using frozen-thawed sperm from Holstein Friesian bulls (3 High fertility, HF and 3 Low fertility, LF) were transferred in groups of 5–10 into synchronized heifers (n = 7 heifers per bull) and recovered following slaughter on Day 15. Day 15 endometrial explants recovered from the uterine horn ipsilateral to the corpus luteum were recovered from synchronized cyclic heifers (n = 4). Explants from each heifer were co-cultured for 6 h in RPMI medium alone (Control) or with 100 ng/ml ovine recombinant interferon tau (IFNT) or with a single conceptus from each HF or LF bull. After 6 h, explants were snap frozen and stored at −80°C. Extracted mRNA was subjected to RNA-seq and the resulting data were analyzed with R software. The numbers of differentially expressed genes (DEG; FDR&lt;0.05) were: HF vs. Control: 956; LF vs. Control: 1021; IFNT vs. Control: 1301; HF vs. LF: 2. Unsurprisingly, the majority of DEG (658) were common to all comparisons and were related to IFNT-induced changes in the endometrium. Prior to applying the adjusted p-value, there were 700 DEG between HF and LF, with 191 and 509 genes more expressed in HF or LF, respectively (p &lt; 0.05). Overrepresentation analysis of KEGG pathways (FDR&lt;0.05), revealed that DEG with higher expression in LF were involved in cell cycle and proteolysis, while those upregulated DEG by HF conceptuses were strongly associated with immune process pathways, such as TNF, NF-kappa B, cytokine-cytokine receptor interaction, and TLR signaling. These pathways were also enriched by DEG upregulated by IFNT compared to the Control. Furthermore, only the HF, and not the LF group, affected the expression of most genes in these pathways (p &lt; 0.05) according to a negative binomial regression model. Finally, a weighted gene co-expression network analysis revealed two clusters of co-expressed genes associated with the HF conceptuses (p &lt; 0.05), which were also enriched for the aforementioned pathways. In conclusion, HF conceptuses, similar to IFNT treatment, stimulated multiple pathways involved in immune response, which were apparently not affected by LF conceptuses.
Echocardiography-based AI detection of regional wall motion abnormalities and quantification of cardiac function in myocardial infarction
Authors: Lin Xixiang , Yang Feifei , Chen Yixin , Chen Xiaotian , Wang Wenjun , Chen Xu , Wang Qiushuang , Zhang Liwei , Guo Huayuan , Liu Bohan , Yu Liheng , Pu Haitao , Zhang Peifang , Wu Zhenzhou , Li Xin , Burkhoff Daniel , He Kunlun 
Published: August 2022

ObjectiveTo compare the performance of a newly developed deep learning (DL) framework for automatic detection of regional wall motion abnormalities (RWMAs) for patients presenting with the suspicion of myocardial infarction from echocardiograms obtained with portable bedside equipment versus standard equipment.BackgroundBedside echocardiography is increasingly used by emergency department setting for rapid triage of patients presenting with chest pain. However, compared to images obtained with standard equipment, lower image quality from bedside equipment can lead to improper diagnosis. To overcome these limitations, we developed an automatic workflow to process echocardiograms, including view selection, segmentation, detection of RWMAs and quantification of cardiac function that was trained and validated on image obtained from bedside and standard equipment.MethodsWe collected 4,142 examinations from one hospital as training and internal testing dataset and 2,811 examinations from other hospital as the external test dataset. For data pre-processing, we adopted DL model to automatically recognize three apical views and segment the left ventricle. Detection of RWMAs was achieved with 3D convolutional neural networks (CNN). Finally, DL model automatically measured the size of cardiac chambers and left ventricular ejection fraction.ResultsThe view selection model identified the three apical views with an average accuracy of 96%. The segmentation model provided good agreement with manual segmentation, achieving an average Dice of 0.89. In the internal test dataset, the model detected RWMAs with AUC of 0.91 and 0.88 respectively for standard and bedside ultrasound. In the external test dataset, the AUC were 0.90 and 0.85. The automatic cardiac function measurements agreed with echocardiographic report values (e. g., mean bias is 4% for left ventricular ejection fraction).ConclusionWe present a fully automated echocardiography pipeline applicable to both standard and bedside ultrasound with various functions, including view selection, quality control, segmentation, detection of the region of wall motion abnormalities and quantification of cardiac function.