bluuebunny/crossref_metadata_2025_split huggingface dataset:
Projection of structure and compositions of resistance to burning polymer composite materials with flame retardants based on magnesium hydroxide
Authors: Brekhova K. A. , Simonov-Emel'yanov I. D. , Pykhtin A. A. 
Published: May 2023

Objectives. To identify general principles for the design of dispersed-filled polymer composite materials (DFPCMs) with different generalized and reduced parameters, as well as types of disperse structure with high fire resistance; to develop an algorithm for the creation of non-combustible polymer composites with flame-retardant fillers.Methods. Scanning electron microscopy and laser diffraction were used to assess the shape, size, and particle size distribution of flame retardants. According to the presented classification of DFPCMs by structural principle, standard bar samples were obtained to determine the oxygen index (OI) and the fire resistance category.Results. For the MFS-2 (medium filled system) and HFS (high filled system) structure types, the maximum resistance to burning (category V-0) is achieved with a generalized parameter of ® ≤ 0.40 volume fractions; the OI value increases in 2 times (up to ~40%) in relation to the polymer matrix.Conclusions. In order to obtain a flame retardant DFPCMs (OI = 40%, category V-0) based on ethylene vinyl acetate with OI = 20% and magnesium hydroxide (brucite), the amount of water vapor released during the decomposition of the flame-retardant filler should be at least ~250 mL/g with a coke residue ~32%. A developed algorithm for calculating compositions and generalized parameters for the creation of DFPCMs having a predetermined type of disperse structure and high resistance to burning is presented.
Biocomposite materials based on polyethylene and amphiphilic polymer-iron metal complex
Authors: Vasilyev I. Yu. 
Published: May 2023

Objectives. To obtain and study the properties including degradability of polymer composite materials (PCM) based on low-density polyethylene (LDPE) obtained by introducing an environmentally friendly additive comprising an oxo-decomposing additive (ODA) based on an amphiphilic polymer-iron metal complex, which accelerates the process of polymer degradation.Methods. PCMs based on LDPE and ODA were produced by processing in laboratory extruders in the form of strands, granules, and films. Thermodynamic properties were determined by differential scanning calorimetry in the temperature range 20-130 °C. In order to assess the performance characteristics (physical and mechanical properties) of the PCM, tensile strength and elongation at break were determined. The biodegradability of PCM was evaluated by Sturm's method, with the biodegradation index being determined by the amount of CO2 gas released as a result of microorganism activity, as well as composting by placing the PCMs for six months in biohumus. Changes in physical and mechanical properties and water absorption of the films during storage were evaluated. The photochemical degradability of the PCM was determined by exposing it to ultraviolet radiation for 100 h (equivalent to approximately one year of exposure of the films under natural conditions). The appearance of the composite samples following removal from the biohumus was determined using an optical microscope with ×50 magnification in transmitted and reflected light.Results. Following biodegradation by composting, the physical and mechanical properties of PCMs decrease by an average of 40.6%. This is related to the structural changes that occur in composites during storage in biohumus, i.e., the formation of a looser structure due to the development of large clusters of microorganisms that affect the formation of microcracks. It leads to the stage of fragmentation of the polyethylene matrix and indicates the progress of biological degradation of composites. In this case, the water absorption of the composite samples was 63% after 96 h of exposure. The biodegradability index determined by the Sturm method after 28 days of bubbling had changed by 82%, indicating an intensive biodegradation process. Exposure to ultraviolet radiation for 96 h resulted in the complete destruction of the PCMs, which turned into small “flakes.” This method is the most effective for the degradation of LDPE- and ODA-based PCMs.Conclusions. According to the results of the study of ODA-containing PCMs based on an amphiphilic polymer-iron metal complex, the tested filler-modifier can be recommended for the production of PCMs offering an accelerated degradation period.
Analysis of nanoparticles and nanomaterials using X-ray photoelectron spectroscopy
Authors: Ischenko A. A. , Lazov M. A. , Mironova E. V. , Putin A. Yu. , Ionov A. M. , Storozhenko P. A. 
Published: May 2023

Objectives. The main aim of this review is to summarize the existing knowledge on the use of X-ray photoelectron spectroscopy (XPS) for the characterization of nanoparticles and nanomaterials.Results. XPS or electron spectroscopy for chemical analysis can provide information on the qualitative and quantitative composition, valence states of the elements of the samples under study, the chemical composition of the surface and interfaces that determine the properties of nanoparticles and nanostructured materials. The review describes the role of several different methods for the characterization of nanomaterials, highlights their advantages and limitations, and the possibilities of an effective combination. The main characteristics of XPS are described. Various examples of its use for the analysis of nanoparticles and nanomaterials are given in conjunction with additional methods to obtain complementary information about the object under study.Conclusions. XPS provides depth information comparable to the size of nanoparticles (up to 10 nm depth from the surface) and does not cause significant damage to the samples. Two disadvantages of XPS analysis are sample preparation requiring a dry solid form without contaminations and data interpretation. XPS provides information not only on the chemical identity, but also on the dielectric properties of nanomaterials, recording their charging/discharging behavior. Chemical information from the surface of nanoparticles analyzed by XPS can be used to estimate the thickness of nanoparticle coatings. XPS has a high selectivity, since the resolution of the method makes it possible to distinguish a characteristic set of lines in the photoelectron spectrum at kinetic energies determined by the photon energy and the corresponding binding energies in elements. The intensity of the lines depends on the concentration of the respective element. Obtaining a sufficiently complete picture of the properties of nanomaterials requires the use of a group of complementary instrumental methods of analysis.
Application of diabatic extractive distillation schemes with preliminary separation of azeotropic components for separation of acetone-toluene-<i>n</i>-butanol mixture
Authors: Klauzner P. S. , Rudakov D. G. , Anokhina E. A. , Timoshenko A. V. 
Published: May 2023

Objectives. The study aims to investigate the effectiveness of the use of various options for organizing the process of diabatic distillation in the separation of a mixture of acetone-toluene-n-butanol by extractive distillation using dimethylformamide as an entrainer in a scheme with preliminary separation of azeotropic components.Methods. As the main research method, mathematical modeling in the Aspen Plus V. 12 software package was used. As a model for describing vapor-liquid equilibrium, the local composition Non-Random Two Liquid equation model was used. Parametric optimization of diabatic schemes was carried out according to the criterion of reduced energy costs.Results. Based on the scheme for extractive distillation of an acetone-toluene-n-butanol mixture with preliminary separation of azeotropic components, five options for organizing diabatic distillation schemes were considered, both with and without use of a compressor to reach a required flows temperature.Conclusion. It is shown that the use of diabatic schemes in the extractive distillation of a acetone-toluene-n-butanol mixture with dimethylformamide makes it possible to diminish the reduced energy costs by 8.9-43.5%. Meanwhile the maximum reduction in energy consumption is achieved in a scheme where upper vapor flows of two other columns are used to heat the azeotropic components separating column.
Quantum chemical research of the molecular structure of 3,4-dicyanofuroxan
Authors: Kolesnikova I. N. , Lobanov N. V. , Lobanov V. N. , Shishkov I. F. 
Published: May 2023

Objectives. The study set out to determine the equilibrium parameters of the 3,4-dicyanofuroxan molecule by means of molecule geometry optimization by quantum chemistry methods, verify the adequacy of the methods used, and compare the obtained results with X-ray diffraction analysis (XRD) and gas electron diffraction (GED) data.Methods. Quantum chemical calculations were carried out using B3LYP, MP2, and CCSD(T) methods with 6-31G(d,p), cc-pVTZ, and aug-cc-pVTZ basis sets.Results. The equilibrium molecular structure of 3,4-dicyanofuroxan was refined by means of quantum chemical calculations using the Gaussian09 program. The geometrical parameters were compared with the structure of this compound in the solid phase and a number of related compounds in gas and solid phases. It was theoretically established that the planar equilibrium structure of the dicyanofuroxan molecule has CS symmetry. The structure of the free dicyanofuroxan molecule was found to differ depending on the phase. The B3LYP and CCSD(T) methods describe the molecular structure of dicyanofuroxan more accurately than the MP2 method. A regularity was revealed, according to which an increase in the basis, as a rule, leads to a better agreement of the geometry, regardless of the functional.Conclusions. The calculations performed are in good agreement with the literature data and results of joint analysis by GED and XRD. The effect of cyano substituents on the ring geometry is observed in comparison with the literature data for the dicyanofuroxan molecule. For the molecule in question, it is better to use the B3LYP/aug-cc-pVTZ method. The values of geometric parameters obtained by this method are in better agreement with the structure in the gas phase. The discrepancies with the experimental XRD results may be due to interactions in the crystal structure. Differences in the geometric parameters obtained on the basis of different functionals and bases make this molecule interesting for experimental structural studies using GED or microwave spectroscopy, which will permit the identification of optimal methods and bases for obtaining the geometric parameters of furoxan class molecules.
PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE ARTIKULASI DAN BERTUKAR PASANGAN TERHADAP HASIL BELAJAR SISWA PADA MATA PELAJARAN IPS TERPADU DI KELAS VII SMP NEGERI 6 KOTA JAMBI
Authors: Zulhen Annisa , Andriani Lili 
Published: May 2023

AbstractThis study aims to determine (1) Whether there is a difference in the average learning outcomes of Integrated IPS in students whose learning uses the Articulation learning model, (2) Whether there is a difference in the average learning outcomes of Integrated IPS in students whose learning uses the Pair Exchange learning model, and (3) Whether there is an influence on the learning outcomes of Integrated IPS in students whose learning uses the Articulation learning model and the Pair Exchange learning model. This type of research is a quasi -experiment. The total population in this study was 235 people. The sampling technique in this study is purposive sampling, so that 40 students of class VII C were selected as the Control class and 39 students of class VII F as the Experimental class. The technique of data collection in this study is to disseminate questions to research respondents and documentation. The data analysis technique in this research is t test using SPSS for Windows Version 16. The results showed that (1) The learning outcomes of students in IPS subjects taught using Articulation type cooperative learning model obtained a mean of 63.59 (2) The learning outcomes of students in Integrated IPS subjects taught using Cooperative learning model of the Exchange type pair obtained a mean score (mean) is 54.12 and (3) The learning outcomes of students in the subjects of Integrated IPS taught using the cooperative learning model of the Articulation type are higher than the student learning outcomes in the subjects Integrated IPS taught using the Cooperative Learning model of Pair Exchange with a value of 0.000> 0.05. Based on the research results obtained, it can be concluded that there is an influence on the use of cooperative learning model type Articulation on student learning outcomes in Integrated IPS subjects in class VII SMP Negeri 6 Kota Jambi. Keywords: Articulation Type Cooperative Learning Model, Pair Exchange Type Cooperative Learning Model, Learning Outcomes.
PENGARUH LINGKUNGAN KELUARGA DAN GAYA BELAJAR SISWA TERHADAP HASIL BELAJAR SISWA KELAS XI IPS MATA PELAJARAN EKONOMI DI SMAN 1 KOTA JAMBI
Authors: Saputra Bayu , Yudha Redi Indra 
Published: May 2023

Abstract This study aims to determine (1) Knowing the description of the family environment, learning styles, and learning outcomes in the economic subjects of class XI IPS at SMA Negeri 1 Jambi City. (2) Knowing the influence of the family environment on learning outcomes in economic subjects in class XI IPS Negeri 1 Jambi City. (3) Knowing the effect of learning styles on learning outcomes in economic subjects in class XI IPS Negeri 1 Jambi City. 4) Knowing the effect of the family environment and student learning styles on student learning outcomes of class XI IPS on economic subjects at SMA Negeri 1 Jambi City. This research design uses quantitative research methods, with data collection techniques through observation, interviews, and questionnaires. Where the population in this study were 143 students with a sample of 106 students. The research instrument test technique used in this study is the Validity and Reliability Test, while the classical assumption tests used are Quantitative Descriptive Analysis, Normality Test, Homogeneity Test, and Multiple Regression Test. The results showed that: (1) The family environment and learning style were included in the fairly good category with an average TCR (X1) of 77.10%, (X2) 75.36%, and student learning outcomes in economic subjects were obtained. A score of less than 68 was 72 students, while those who scored above 68 were 34 students.(2) There is an influence of the family environment on learning outcomes which can be seen from the tcount value of the family environment variable (X1) of 2,212> 1,658. (3) There is an effect of learning styles on learning outcomes which can be seen from the tcount> ttable that the tcount of learning style variable (X2) is 2.184> 1.658). 4) There is an effect of the family environment and student learning styles on student learning outcomes with a value of 8.892 with a significant value of .000. Thus, a good family environment will have a positive impact on children so that children become enthusiastic in carrying out the learning process, and learning styles are influential enough for each individual to absorb information from outside himself. So, with a family environment and a good learning style it can improve student learning outcomes Keywords: Family Environment, Learning Style, Learning Outcome
ANALISIS PENGARUH SISTEM MANAJEMEN KERJA TERHADAP TINGKAT KEBERHASILAN PRAKTEK KERJA LAPANGAN JURUSAN AKUNTANSI PADA SISWA SMK N 1 KOTA JAMBI
Authors: Andronikus Dio , Kasiono Kasiono 
Published: May 2023

Abstract This study aims to determine: (1) Knowing how the description of the work management system and the success rate of field work practice in the accounting department at SMK Negeri 1 Jambi City. (2) Knowing how the work management system influences the success rate of field work practice in the accounting department at SMK Negeri 1 Jambi City. This research design uses quantitative research methods, with data collection techniques through questionnaires (questionnaire) and documentation. Where the population in this study were 146 students with a sample of 106 students. The research instrument test techniques used in this study were validity and reliability tests, while the classical assumption tests used were quantitative descriptive analysis, normality test, homogeneity test, simple regression test and partial t test. The results of this study indicate that: (1) There is a description between the implementation of field work practices and work management systems. (2) There is a significant influence between the work management system on field work practices in class XII accounting students at SMK Negeri 1 Jambi City. This is confirmed by t count> t table, which is 2.019> 1.658. Thus, the implementation of field work practices will be better implemented if the procedures and debriefing carried out by the school are optimized. The implementation of field work practices will be very influential if the process is guided by a good work management system. So, this linkage will have a better impact on the implementation of practical learning. Keywords: Work Management Systems, Street Vendors
EFISIENSI DAN DAMPAK TRANSPORTASI ONLINE DALAM MENINGKATKAN KESEJAHTERAAN DRIVER GOJEK DI KOTA JAMBI
Authors: Ayuningsih Fitri , Sembiring Benar 
Published: May 2023

Abstract This study aims to (1) Analyze the efficiency of online transportation, the impact of online transportation and the welfare of Go-jek drivers in Jambi City, (2) To analyze the efficiency and impact of online transportation on improving the welfare of Gojek drivers in Jambi City. This research uses qualitative research with the type of phenomenon research. Data collection techniques were carried out by observation, interviews, and documentation study. Data analysis in this study consisted of taking notes in order to produce field notes and coding, classifying data, and drawing data conclusions or verification. From this research, it can be concluded that the efficiency of online transportation for motorbikes makes it easier for consumers to get the transportation they want only, with their smartphones and internet quota without having to come to the base. Where the rates offered by the Gojek application are quite cheap both in the order rates or services offered. In addition, even though the driver's monthly wage is not stated in the work contract, the income earned by the driver can meet the needs of his family. Keywords: Efficiency, Impact, Online Transportation, Welfare
PEMBELAJARAN BERBASIS ONLINE DALAM PERSPEKTIF PERAN ORANG TUA SISWA DI SMK NEGERI 5 TANJUNG JABUNG BARAT
Authors: Krisdayani Krisdayani , Mayasari Mayasari 
Published: May 2023

Abstract This study aims to (1) find out parental guidance in online learning for their children who attend SMK Negeri 5 Tanjung Jabung Barat, (2) determine the attitudes of parents in fulfilling online learning needs for their children who attend SMK Negeri 5 Tanjung Jabung Barat, (3) to determine the dynamics of online-based learning in the perspective of the role of parents of students at SMK Negeri 5 Tanjung Jabung Barat. This research uses a qualitative approach with the type of phenomenon research. Data collection techniques are carried out by observation, interviews, documentation study. Data analysis in this study consisted of data reduction, data display, taking conclusions or verification. From the results of the study it can be concluded that parents have a role as fulfilling children's needs, as guides in learning, parental supervision in online learning can be seen from the way parents motivate and encourage children to learn, as well as help them in using online-based technology to support successful learning outcomes. which are desired. Keywords: Online-Based Learning, Parents' Role Perspective
PENGARUH KOMPETENSI PEDAGOGIK DAN KOMPOTENSI PROFESIONAL TERHADAP KINERJA GURU SMK NEGERI 1 KOTA JAMBI
Authors: Pascalia Priska , Yudha Redi Indra 
Published: May 2023

Abstract This study aims to (1) Know the general description of pedagogic competence, professional competence and teacher performance at SMK Negeri 1 Jambi City. (2) Knowing the importance of pedagogical competence on the performance of teachers in SMK Negeri 1 Jambi City. (3) Knowing the importance of professional competence on the performance of teachers in SMK Negeri 1Kota Jambi. (4) Knowing how much influence pedagogic competence and professional competence have on the performance of teachers in SMK Negeri 1 Jambi City.This research design uses quantitative research methods, with data collection techniques, through observation, interviews, and questionnaires. Where the population in this study were 109 teachers and a sample of 86 teachers. The research instrument test technique used in this study is the validity and reliability test, while the classical assumption test used is quantitative descriptive analysis, normality test, homogeneity test, linearity test, multicollinearity test, and multiple regression test.The results showed that: (1) pedagogical competence was included in the fairly good category with a TCR value of 68.03%, professional competence in the good category with a TCR value of 80.39%. (2) There is an effect of pedagogical competence on teacher performance with a tcount of 2.405 at a significant level of 0.018. (3) There is an effect of professional competence on teacher performance with a tcount of 2.897 at a significant level of 0.005. (4) pedagogical competence and professional competence have an influence on teacher performance which can be seen from the Ftable value of 6,552 with a significant value of 0.002. Thus, teacher performance is a description of the work done by educators with the tasks they carry out through pedagogical competences and professional competences that an educator must have.Keywords: Pedagogic Competence, Professional Competence, Teacher Performance
ANALISIS FAKTOR-FAKTOR KESULITAN BELAJAR SISWA DALAM PEMBELAJARAN DARING (DALAM JARINGAN) PADA MATA PELAJARAN EKONOMI KELAS XII DI SMA NEGERI 1 KOTA JAMBI TAHUN AJARAN 2020/2021
Authors: Rafiuni Suci , Afrila Diliza 
Published: May 2023

Abstract This study aims to determine the factors of student learning difficulties in online learning in Economics class XII at SMA Negeri 1 Jambi City. This type of research is a descriptive study and a quantitative approach. The population in this study was 174 people. The sampling technique in this study was random sampling, so that 121 students were selected as the research sample. The data collection technique in this study was to distribute questionnaires to research respondents. The data analysis technique in this study is factor analysis with the SPSS For Windows Version 16 program. The results of this study indicate that (1) the learning difficulty variable is in the sufficient category with an average of 3.40 and the Respondents' Achievement Level (TCR) of 67.92. and (2) there are 11 (eleven) dominant factors that influence student learning difficulties, namely (a) factor 1 which is given the identity of the Learning Environment, (b) factor 2 which is given the identity of Learning Interests, (c) factor 3 which is given the identity of Talent, (d) factor 4 which is given the identity of Learning Motivation, (e) factor 5 which is given the identity of Learning Habits, (f) factor 6 which is given the identity of Intelligence, (g) factor 7 which is given the identity of Student Characteristics, (h) factor 8 which is given School climate identity, (i) factor 9 which is given the identity of the Learning Method, (j) factor 10 which is given the identity of Learning Tools, and (k) factor 11 which is given the identity of Family Roles. Keywords: Learning Difficulties.