bluuebunny/crossref_metadata_2025 huggingface dataset:
Новая перспектива академической прокрастинации: адаптивные аспекты и теория высокой прокрастинационной стены
Authors: Попова Дарья И.
Published: July 2022

Во Введении приводится авторское определение академической прокрастинации и типичная для обучающегося ситуация прокрастинации. Необходимость приведения определения обуславливается комплексным характером рассматриваемого явления. Автором обозначены основные подходы к пониманию рассматриваемого явления. Академическая прокрастинация рассматривается как: ошибка саморегуляции; способ совладания с негативными эмоциями; личностная черта; стратегия эффективного решения задач в условиях ограниченного времени. Цель нашего исследования: рассмотрение академической прокрастинации с точки зрения ее адаптивных аспектов и защитной функции. Новизна настоящего исследования заключается в предложении новой перспективы на проблему академической прокрастинации в образовательной среде в качестве теории высокой прокрастинационной стены, кроме того, автор рассматривает прокрастинацию в качестве неотъемлемой части смысловой структуры личности. В разделе «Теоретическое обоснование» академическая прокрастинация описана в качестве действия преградного, отклоняющего и дезорганизующего влияния смысловой установки. Автором впервые приведена и подробна описана теория высокой прокрастинационной стены, где возникновение академической прокрастинации объясняется с позиции недостаточной наполненности смыслом академических заданий и учебной деятельности в целом. В разделе «Обсуждение результатов» академическая прокрастинация рассмотрена в контексте защитных механизмов личности. Прокрастинирующие студенты чаще всего используют механизмы «рационализация», «регрессия» и «замещение», которые являются адаптивными и в крайне малой степени искажают реальность. В Заключении автор указывает на необходимость смены подхода к пониманию академической прокрастинации, что может в долгосрочной перспективе не только решить проблему откладывания выполнения заданий, но и повысить интерес к образованию и занятию учебной деятельности.
Teori-Teori Hubungan Hukum Agama Dengan Hukum Negara
Authors: Ikhlas Al , Yusdian Desi , Murniyetti Murniyetti , Nurjanah Nurjanah , Sulaiman Sulaiman
Published: July 2022

The formation of national law which is the basis for realizing justice in Indonesia has gone through a long process. Starting from the entry of Islam into Indonesia and is still ongoing now. In the formation of the national law, there are at least four theories that explain how the struggle for legal sources that have been integrated with Indonesian society has crystallized into the main guideline in regulating the lives of Indonesian people. The sources of law are Religious Law, Customary Law, and Dutch Law. Combining these three sources of law to become national law is not simple. So that clashes often occur which results in the birth of various conflicts in the community. In particular, when the Dutch Colonial tried to apply their laws in Indonesia, they set rules according to their interests in order to strengthen their grip on the colonized country. So to explain how the process of forming national law, there are several theories that can explain it, namely: Receptie in Complex, Receptie, Receptie a Contrario, and Eclecticism. This research is in the form of qualitative which tends to be analytical and descriptive. Data were collected from various relevant literature and then analyzed using interactive methods. Thus, the findings of this study are that the theory of Receptie in Complex, Receptie, Receptie a Contrario, and Eclecticism explains that national law and religious law have a strong relationship. So national law and religious law will always be united in their principles because the majority of Indonesian people are Muslims.
Prospective mathematics teachers’ understanding of proof in mathematics for high school
Authors: Mirza Ade , Fitriawan Dona , R Zubaidah , Nursangaji Asep
Published: July 2022

Changes in the mathematics education curriculum affect the preparation of prospective teachers to learn as well as possible and provide extensive opportunities and experiences regarding mathematical proof in secondary schools, especially those reflecting the nature and role of proof in the field of mathematics. Teachers' ability to respond to this depends on their understanding of proof in a mathematical context. This research examined the understanding of 36 prospective mathematics teachers at Tanjungpura University regarding proof and their ability to prove problems in the context of high school mathematics. The data were collected through a series of interviews focused on their responses to the role of proof and from tests to prove math problems. This research is descriptive-analytical research, which describes the conception of prospective mathematics teachers as knowledgeable in mathematics about proof. However, some view proof as a tool for studying mathematics. This research also found that many of them had a limited view of the nature of proof. They lacked a clear understanding of the subject of demonstrating or explaining the process of proving a mathematical statement.
Effect of self and peer assessments on mathematics learning achievement
Authors: Baiduri Baiduri
Published: July 2022

Assessment is an essential part of the learning process in higher education. As a result, the assessment should involve students in addition to lecturers. The purpose of this study is to examine the self and peer assessments on the answers to midterm and final-semester exams given by lecturers and their relationship with student achievement. The participants in this study were 114 fifth-semester mathematics education students who took differential equations courses. Data were gathered from student assessment scores on the middle and final test and student achievement in the lecturer's differential equations courses. The data were analyzed using descriptive statistics and an independent sample t-test to describe the self and peer assessments. Pearson correlation analysis was also used to describe the relationship between self and peer assessment and learning achievement. The study revealed no significant difference between self and peer assessments, both midterm and final semester assessments. The midterm assessment said that the average self-assessment was higher than peers. Meanwhile, the assessment average scores obtained in the semester's final exam were nearly identical between the two assessors. There is a positive and significant correlation with a high level of self and peer assessments, both in the midterm and final semester, and a positive and significant correlation with a moderate level of self and peer assessments with learning achievement. These findings can be used as a basis for lecturers to consider when involving students in assessing student achievement.
Motivation and learning media: How do they affect mathematics learning outcomes after the covid-19 pandemic?
Authors: Pramita Mitra , Sukmawati R Ati , Wiranda Nuruddin
Published: July 2022

After the pandemic, people began to adjust to the changes during the pandemic. The rapid progress and development of information and technology are now entering the world of education. Information technology has begun to be widely used to support the smooth running of the teaching and learning process, one of which is to support student learning outcomes. This study aimed to determine the differences in student learning outcomes in the control and experimental classes by considering students' learning motivation. This type of research is an experimental study with a 2×2 factorial design. Discrete mathematics learning outcomes for even-semester students in 2021/2022 will be grouped based on learning media (PowerPoint and Kahoot) and student motivation (high and low). To find out the differences in student learning outcomes, a 2-way ANOVA test was carried out using SPSS. The results of this study show significant differences in student learning outcomes between students with high learning motivation and those with low learning motivation. There is no significant difference in learning outcomes between Kahoot learning media and PowerPoint learning media. Then it is known that other factors affect student concentration; namely, an interaction between learning media and learning motivation influences students' learning outcomes. The Kahoot media was proven to make the learning atmosphere more fun during the learning activities. Students were more active in participating in the learning process.
Investigating the effectiveness of using various mathematics learning media among students with various learning styles
Authors: Laswadi Laswadi , Supriadi Nanang , Khaidir Christina , Anggoro Bambang Sri
Published: July 2022

Appropriate mathematics learning media is one factor determining the success of learning mathematics. Teachers can use various types of media to help students learn mathematics. However, teachers must consider the learning media's suitability with students' characteristics. This study aims to 1) reveal the most effective learning media for visual, auditory, and kinesthetic learning styles; 2) determine the interaction between learning media and learning styles on students' mathematics achievement. Therefore, this study used a 3 × 3 factorial design. The sample in this study was 29 eighth-grade students in junior high school. Researchers used questionnaires and mathematics achievement tests to collect research data to be analyzed quantitatively. The results show that interactive applications are the most effective learning media for students with different learning styles. Besides, there is a significant interaction effect between learning media and learning styles on students' mathematics achievement.
Religion and State in the Islamic Political Paradigm in Indonesia Perspective of Prof. Kamsi
Authors: Karimullah Suud Sarim
Published: July 2022

The relationship between religion and the state has always been an actual problem in the discourse of Islamic political thought. This paper aims to describe the relationship between religion and the state in Indonesia with a focus on studying the Islamic political paradigm in the view of Prof. Kamsi, who is one of the professors in the study of Islamic law politics at UIN Sunan Kalijaga Yogyakarta. Then, library research with analytical descriptive nature is used in this research by conducting a descriptive study that aims to provide answers to various problems regarding the state of a particular subject or object in detail. Then, various data that have been obtained are analyzed and interpreted to get an adequate explanatory meaning. Furthermore, this study states that in the view of Prof. Kamsi. In general, the pattern of relations between religion and the state is not just a pattern of dichotomous relations that cancel each other out. However, the relationship between religion and the state must be harmoniously and proportionally established. This is intended so that the thinking process of Muslims will not be disturbed by the development of a country that is pioneering and building a better and functioning state order for the long term.
Collaborative Learning and Mini Research Assignments on The History of Islamic Educational Thought: The Impact of Students' Critical Thinking Ability
Authors: Amrullah Amrullah , Mustofa Muhammad , Fuhaidah Ulya
Published: July 2022

This study aims to determine the effect of collaborative learning models and mini research assignments on the critical thinking skills of Postgraduate Students of the Islamic Education Study Program (PAI) of the State Institute of Islamic Studies (IAIN) Curup. The research design used in this study was non-experimental. The sampling technique used was total sampling by taking the entire population as research respondents. The sample in this study was the first-semester Postgraduate students in Class A and B of IAIN Curup. They have taken the History of Islamic Educational Thinking Course in the Academic Year of 2021-2022. Based on the statistical analysis to determine the relationship between collaborative learning and critical thinking skills, the tobserved (9. 110) was more significant than the tcritical (2,056). Furthermore, the obtained tobserved (26,674) was more significant than the tcritical (2,056) to determine the relationship between mini research assignments and critical thinking skills. The analysis also shows that Fobserved (571.6) was more significant than Fcritical (3.34). Therefore can be concluded, there was an effect of collaborative learning, partially and simultaneously, on the critical thinking skills of IAIN Curup Postgraduate Students.
Mobile Learning Media for Islamic History Studies: Evaluation and Shaping Futures
Authors: Hasanah Ida Faridatul , Hadi Fais Nurul , Hasanah Uswatun
Published: July 2022

This study aims to develop, determine the feasibility and attractiveness of learning in the form of learning media based on mobile learning on Bani Umayyah material as an alternative learning. The type of research used is research and development with the Borg and Gall model. Product feasibility is carried out by validating material experts and media experts. Then the researchers conducted a small group attractiveness test to 10 students and a field trial by 35 students to see the students' responses. This research produces a product in the form of an SKI learning application that contains material for the Bani Umayyah chapter 1. The results show that mobile learning-based learning media is feasible with a percentage achievement of 83.4% according to material experts and 85.2% according to media experts. The results of the trial on students showed a percentage of 85.6% with very interesting criteria. So it can be concluded that mobile learning-based learning media with decent quality and attractiveness can be effectively used as alternative learning media. Therefore, more rigorous studies on the development of mobile learning principles and frameworks in various contexts are necessary for future Islamic studies.
Story Method in Applying Islamic Religious Education Values in Early Childhood Education Students
Authors: Misra Misra , Trinova Zulvia , Nasution Riskha Hanifa , Mayuni Windri
Published: July 2022

The purpose of this study is to describe the story method and its implications in applying Islamic Religious Education values in early childhood. This is a descriptive qualitative study with data collected through observation, interviews, and documentation. This study analyzed data through data reduction, data presentation, and drawing conclusions. The findings revealed that forming faith, worship, and morals at an early age in learning can be accomplished through the use of the story method, in which the teacher reads directly to students a unique and exciting storybook containing the value of Islamic religious education. Then, the teacher illustrates what is told to the students. It is also enriched with good habits through daily routine activities, exemplary teachers, discipline, and applying the values of faith, worship, and morals in life so that students can understand the materialexplained by the teacher. Concluded, following the implementation of the story method at PAUD Durian Ajung Padang Pariaman, students have applied good morals when entering classrooms by reciting prayers taught by the teacher and performing greetings. Those activities have become habits performed daily.
The Psychological Approach of Transpersonal Theory in Islamic Education
Authors: Rahmi Nafizatur , Putro Khamim Zarkasih , SZ Zaky Faddad
Published: July 2022

This study aims to examine and describe the integration of the psychological approach of transpersonal theory in Islamic education. The method used in this research is the Library Research method using documentation as a data collection method and analyzing it with Content Analysis. The results show that transpersonal psychology integrates psychological concepts, theories, and methods with material and practice from individual subjects' spiritual disciplines. Its application in Islamic education, peace of mind, and faith is the basis for carrying out learning activities well. So, if it is associated with religion, humans will have a peaceful soul if they have strong, firm, and true faith and always remember Allah. So it can be concluded that the psychological approach of transpersonal theory directs the achievement of education by focusing on happiness and peace of mind, maximizing the potential of reason by contemplating and relying on God for the results or outputs of the educational process.
PAI (Islamic Religious Education) Teacher in Facing The Millenial Era Challenges
Authors: Amaly Abdul Mun'im , Ruswandi Uus , Muhammad Giantomi , Erihadiana Muhammad
Published: July 2022

The 21st century, known as the millennial era, cannot be separated from technological advances and other advances that cannot be denied. However, many PAI (Islamic Religious Education) teachers are less capable and less ready to face students in this millennial era. Therefore, the researchers examined PAI teachers' readiness to meet the millennial era's challenges using the library research method taken from various indexed scientific journals. Then, the researchers analyzed the data using the content analysis method. Research result showed that the challenges of Islamic religious education teachers in the millennial era are related to technology and the process of education that cannot be separated from character education that upholds the values of Islamic teachings by applying technology-based learning. Teachers as role models of a religious character and have an optimistic attitude in developing personality according to Islamic principles. So it can be concluded the Islamic religious education teachers are dynamic and open in absorbing various technologies and information that will support their competence. With teachers' adaptive competence, students in this millennium era are expected to master multiple skills and have clean hearts, minds, and noble characters.
STEM-Based Global Warming E-Book in Sustainable Development Based on Gender View
Authors: Aswirna Prima , Aldila Endang , Nurhasnah Nurhasnah , Fahmi Reza
Published: July 2022

Gender has become a critical issue globally because it is one of the main goals of global collective transformation in sustainable development. This research is motivated by the absence of science teaching materials with STEM-based global warming material with the principle of sustainable development in terms of gender perspective. The purpose of this research is to develop and produce a STEM-based e-book with sustainable development principles based on gender that is valid, practical, and effective. This research is a Research and Development using the Plomp model which consists of 3 stages, namely the initial research stage, the development stage, and the assessment stage. The results showed that the STEM-based e-book with gender-based sustainable development principles obtained a validity test result of 85.85%, a practicality test result of 87.16%, and an effective test result for female students of 83, 5% while for male students is 80%. So, it can be concluded that e-books are very valid, very practical, and very effective for use in classroom learning.
CORE and Problem Bassed-Learning: The Impact on Critical Thinking Ability Based on Self Regulation
Authors: Bastian Veri , Huda Nizlel , Suratno Suratno , Yudistira Pengki
Published: July 2022

The low ability to think critically can affect the student's learning process. In overcoming the problem of critical thinking, teachers must first observe students' self-regulation. This quasi-experimental study aims to determine the effect of the CORE and PBL models on students' critical thinking skills based on self-regulation and interactions. The population is all 8th grade students of SMP N 1 Tungkal Ulu. Random sampling technique was used to choose class VIII B as experimental class 1 with 34 students, VIII D as experiment class 2 with 32 students, and VIII E as control class with 33 students. Data were collected using test questions. Statistical test using two-way ANOVA with SPSS software version 21 with a confidence level of 0.05. The results of the study based on hypothesis testing in the three classes obtained that Fcount was 18.693 while the value of Ftable was 4.00, meaning that Fcount was greater than Ftable. These results indicate that H1 is accepted (there are differences in critical thinking). It was concluded that CORE and PBL learning had an effect on improving students' critical thinking skills compared to traditional learning. However, there is no interaction between learning treatment and critical thinking skills.
"A BOLSA AMARELA" Tertúlias literário-performativas na escola em tempos de pandemia
Authors: De Oliveira Pontes Rosa Cintia , Caroline Pereira Arruda Anne , Gonçalves Michelle Bocchi
Published: July 2022

Este trabalho tem como objetivo compreender, pelo viés da Análise Dialógica do Discurso (ADD), os sentidos de leitura literária da obra A bolsa amarela, de Lygia Bojunga, por estudantes do 5º ano (Fundamental 1) de uma escola privada de Curitiba. Foram realizadas tertúlias literário-performativas para a leitura e debate da obra, explorando os sentidos produzidos. Os sentidos compreendidos na análise estão relacionados às vontades artísticas, esportivas, religiosas e profissionais dos estudantes, os quais abordaram questões relativas a gênero e escolha profissional. Os resultados apontam para a desigualdade de gênero relacionadas a algumas atividades, bem como sinalizam a pressão social pela escolha profissional ainda na infância, o que envolve decisões difíceis de serem tomadas em idade pueril. Além disso, a análise possibilita a discussão sobre a valorização da conquista de um diploma e as dificuldades referentes a atingir esse objetivo acadêmico.
O NARRADOR PLURAL: biografias e disposições sociais de contadores de histórias
Authors: Ferreira Fernando Ilídio , Ribeiro Mariana
Published: July 2022

A linguagem é o meio pelo qual os seres humanos se relacionam, dialogam e comunicam, de diversas formas, incluindo a imagem, a música, a dança, etc. É toda a forma de expressão, incluindo a língua, mas não se restringindo a ela. Neste artigo, que apresenta um trabalho empírico sobre práticas narrativas de contadores de histórias, com base em entrevistas biográficas, salta à vista a importância da linguagem, tal é a variedade de recursos que eles mobilizam, de forma plural, mas também singular, em contextos e com públicos muito variados, usando o corpo, o movimento, o gesto, a teatralidade e a ludicidade. O quadro teórico e metodológico que inspira a pesquisa é o da sociologia à escala individual, de Bernard Lahire, com aproximações aos retratos sociológicos propostos por este sociólogo francês. Num primeiro momento, discute-se o método biográfico-narrativo e a crescente importância que o mesmo tem tido na sociologia e nas ciências sociais, em geral, analisando-se seguidamente duas entrevistas biográficas com contadores de histórias, procurando assim dar conta do social individualizado. O ator plural, que é designado, por afinidade, no título do presente artigo, narrador plural (o contador de histórias), constrói, nos seus percursos e através de experiências de socialização passadas, patrimónios individuais de disposições para agir, para crer e para sentir, que se tornam presentes de maneira compósita e não linear nas suas práticas narrativas.
Aplikasi Penagihan Pajak Terhutang (SPPT) Masyarakat Berbasis Android
Authors: Jannah Lailatul , Widya Moh.Anshori Aris
Published: July 2022

Pengelolaan PBB dalam pajak daerah telah diatur dalam UU Nomor 28 pada Tahun 2009 yaitu tentang Retribusi dan Pajak Daerah. Desa Sumbermulyo Kecamatan Jogoroto Kabupaten Jombang, memiliki system manual dimana salah satunya pada system pajak yaitu penagihan Surat Pemberitahuan Pajak Terhutang (SPPT) yang masih menggunakan kertas untuk dokumentasi tagihan pajak oleh wajib pajak. Desa Sumbermulyo Kecamatan Jogoroto terus meningkatkan kualitas pelayanannya agar terciptanya layanan umum yang baik salah satunya Wajib Pajak. Dalam hal tersebut, Desa Sumbermulyo untuk mempermudah pelayanan dalam pembayaran pajak telah membuat terobosan baru dimana petugas penagihan pajak tidak perlu membawa kertas surat tagihan pajak. Wajib Pajak pada sistem tersebut dapat membayar pajak dengan mudah melalui sistem online yang digunakan oleh petugas penagihan pajak untuk membayar pajak. Metode yang dilakukan untuk Analisis data dan rancang bangun aplikasi ini adalah RD (Research and Development). Aplikasi e-simapat dibuat dalam sistem operasi android. Aplikasi ini berupa data tagihan wajib pajak terhutang, yaitu wajib pajak untuk orang pribadi dan badan usaha suatu perusahaan.
Sistem Informasi Akuntansi Perusahaan Dagang Berbasis Web Pada Toko Norkayati
Authors: Sholikhudin Muhamad , Utomo Andy Prasetyo , Irawan Yudie
Published: July 2022

Dari proses bisnis yang ditemukan pada usaha dagang Norkayati, banyak dijumpai proses pembuatan laporan keuangan dan transaksi yang mengalami kendala karena tidak diatur dengan baik, terlebih lagi tidak ada metode pencatatan keuangan yang diterapkan sehingga membuat pemilik tidak dapat memperkirakan kondisi keuangan, apakah memberikan keuntungan atau justru sebenarnya mengalami kerugian. Pengelolaan keuangan dilakukan secara manual yang tercermin dari pencatatan transaksi penjualan pada sebuah buku Bendahara sesuai dengan transaksi yang terjadi di Kasir. Demikian juga dengan transaksi pembelian, pencatatan dilakukan pada buku Bendahara juga. Pencatatan dilakukan setelah bendahara melakukan pembayaran pembelian barang, jika mengalami kekurangan maka kekurangannya dilunasi oleh pemilik toko dari dana pribadinya, bukan dari siklus dana transaksi. Hal ini terjadi secara terus menerus sehingga dapat dibayangkan sulitnya membuat laporan keuangan dengan membaca laporan keuangan yang berlembar – lembar. Selain itu, pihak pemilik toko juga akan sulit untuk mengetahui dengan pasti berapa jumlah modal yang telah dikeluarkan, yang pada akhirnya akan berpengaruh pada perhitungan keuntungan dan sehat atau tidaknya sebuah usaha perdagangan. Apabila terdapat pengelolaan keuangan yang lebih baik, maka pemilik toko akan lebih mudah menentukan alokasi keuangan yang tepat dalam rangka pengembangan usahanya. Berdasarkan permasalahan yang dijelaskan, maka peneliti ingin memberikan solusi dengan membuat Sistem Akuntansi pada Usaha Dagang Norkayati berbasis Web, dengan harapan mempermudah pengelolaan keuangan secara lebih rapi dan tersistem dan mengembangkan usaha dagangnya.
Model Web E-Commerce Guna Memperluas Pemasaran Produk Furniture
Authors: Yanuarti Elly , Romadiana Parlia , Kiswanto Kiswanto
Published: July 2022

E-commerce saat ini sudah menjadi kebutuhan bagi setiap usaha yang bergerak di bidang perdagangan. E-commerce memberikan kemudahan bertransaksi bagi konsumen dimanapun dan kapanpun. Transaksi penjualan Leny Jati Furniture masih dilakukan secara konvensional sehingga memiliki keterbatasan dalam penyebaran informasi dan pemasaran produknya. Untuk dapat bertahan dan bersaing maka Leny Jati Furniture memerlukan sebuah sistem yang berbasis web. Penelitian ini menggunakan metode berorientasi objek dengan pemodelan Unfied Modelling Language (UML). Model pengembangan sistem menggunakan Rapid Application Development (RAD). Hasil dari penelitian ini adalah sebuah website yang dapat memberikan informasi produk furniture, memfasilitasi konsumen melakukan pemesanan dan pembelian produk secara online serta sebagai media promosi untuk memperluas jangkauan pemasaran.
Orfeo en París. "Manuscrito hallado en un bolsillo", de Julio Cortázar.
Authors: Rosas Martínez Alfredo
Published: July 2022

El relato “Manuscrito hallado en un bolsillo” de Julio Cortázar se basa en un juego que se convierte en ceremonia y rito, el cual requiere un tiempo y un espacio sagrados. Este espacio, nocturno y subterráneo, adquiere un carácter mítico. El plano del metro de París se corresponde con algunas pinturas de Piet Mondrian. Algunas ideas de este artista, y de René Magritte, sobre el arte de la pintura se corresponden con algunas ideas literarias de Cortázar. Al cuento le subyace el mito de Orfeo.
Increasing the efficiency and reliability of gas turbine power plants through the use of additive technologies
Authors: Basati Panah M. , Rassokhin V. V. , Barskov V. V. , Matveev Y. V. , Kortikov N. N. , Laptev M. A. , Gong B. , Chu V. Ch.
Published: July 2022

The article is dedicated to the study of the feasibility of increasing the efficiency, reliability and manufacturability of existing gas turbine power plants with additive technologies that allow creating recuperators with regeneration degrees of 90...95%. The characteristics are presented for the following gas turbine power plants: TEEDA (Iran) 3.13 MW, ODK Perm Motors GTU-4P (Russia) 4.13 MW, Siemens SGT-100 (Germany) 5.1 MW, Solar Turbines Taurus 60 (USA) 5.67 MW. The research was carried out using the methods and programs of the Higher School of Power Engineering for the calculation of thermal circuits of GTPP. The dependences of effective efficiency, work ratio, effective specific work and specific consumption of conventional fuel of GTPPs under examination on compressor pressure ratio and regeneration factor are obtained. Solving the problem of increasing the regeneration factor in GTPP (above 0.9) requires the development of special designs of heat exchanger matrices of the recuperator, which is only possible with the use of additive technologies and new heat-resistant materials. Promising recuperators have a more complex design of heat exchange matrices, which ensures their being very compact. Such technical solutions can ensure the development and creation of fundamentally new designs of GTPP heat exchangers and significantly improve their technical characteristics.
Development of a prediction model for the probability of failure-free operation of elements and components of the main equipment of hydroelectric power plant
Authors: Baydakova N. V. , Tyagunov M. G. , Sultanov M. M. , Ivanitsky M. S.
Published: July 2022

A structural diagram of calculation of reliability of hydraulic turbines is proposed taking into account control of arameters of state of system elements, based on data of the map of setpoints of automation and process protection of hydroturbine of HPP. Failure-free operation of hydraulic unit systems and assemblies was analyzed for reliability indicators. The main elements of the system are identified. The safety of HPP operation largely depends on the reliability of the main generating equipment. Hydroturbine equipment of a hydroelectric power plant is designed for specific operating conditions characteristic for each type of hydroelectric power plant. This allows for each type of turbine to efficiently obtain the greatest amount of hydraulic power if they operate under proper conditions. Therefore, when evaluating reliability indicators, it is proposed to take into account weighting factors reflecting the degree of influence of a particular parameter on the reliability of the system. The obtained results were compared according to the proposed model and according to the regulatory methodology for assessing the probability of system failure-free operation in a generalized form. Based on the results, a model is proposed that takes into account the failures of the hydraulic unit elements to predict the probability of trouble-free operation in order to ensure the reliability of equipment operation beyond the design service life and reduce operating costs.
Modernization of inertial-vacuum ash collector
Authors: Mostovenko L. V. , Beloglazov V. P.
Published: July 2022

Various variations of reducing the aerodynamic resistance of devices with a complex configuration of the flow path are considered. About 50% of power plants in the Russian Federation operate on coal, while two-stage cleaning is used in the ash collection process. Modern coarse ash collectors can achieve an efficiency of 55 – 80%, depending on the period of their work. It is advisable to reduce the number of purification stages by upgrading with the use of modern cleaning devices, which allow achieving high efficiency in cleaning a dusty flow and less subjecting this treatment complex to repair work. The inertial-vacuum ash collector (IVAC) provides trapping of a wide range of studied particles (1 – 100 microns) with an efficiency of up to 99%. This device was tested at the combined heat and power plant of the city of Omsk, and in addition to high efficiency, increased aerodynamic resistance was established. The aim of this work was to achieve an aerodynamic resistance of 660 Pa (resistance of the cyclone apparatus, so that the apparatus can be used as the first, and consequently as two stages of cleaning) while maintaining the efficiency of the apparatus. To achieve this goal, the IVAC uses the method of perforating holes along the divider for the subsequent decrease in speed in the confuser channel and a general decrease in resistance on the device. Perforation is carried out at three different heights, the distance between which is 1 meter. The study used the analysis of a numerical experiment in ANSYS CFX using a k-ε mathematical model (mass ash content 70 g/kg; One-way Coupling). Recommendations for further prospects for the study of the IVAC are proposed.
Study of chemical properties of insulation mixtures to be used in high-voltage equipment
Authors: Lyutikova M. N. , Korobeynikov S. M. , Sotnikov S. I. , Konovalov A. A.
Published: July 2022

Reliable operation of high-voltage oil-filled equipment directly depends on the condition of the insulation. One of the main components of the insulation system is transformer oil, which has been used for more than 120 years. However, in the light of modern requirements for insulating materials, oil is significantly inferior to synthetic esters in terms of such properties as chemical stability, environmental safety and high fire resistance. At present, the mixing of synthetic ester and transformer oil can be considered as one of the ways to improve the properties of the latter. A change in the chemical properties of an insulating liquid during its aging, and, consequently, the formation of various impurities and a change in the structure of its component composition will also affect the electrical insulating characteristics of the liquid dielectric. And the more the liquid is oxidized, the more significantly the electrophysical parameters worsen, including the main parameter — electrical strength (or breakdown voltage).This paper presents the results of a study of the chemical properties of mixtures of oil and synthetic ester during prolonged exposure to elevated temperatures. The assessment of the quality of insulating mixtures was carried out by changing such indicators as optical turbidity, acid value, ester value, peroxide value, surface tension and corrosiveness. Fluid testing results in this study indicate that blending of synthetic ester with aromatic oil at 10% and 20% (v/v) results in mixtures that show signs of a colloidal system. This is evidenced by atypical trends in the diagrams indicating the change in peroxide value, acid value and optical turbidity during their aging at a temperature of 110ºС with free access of air to the surface of the mixture. Increasing the proportion of ester in the mixture to 30% and above leads to stabilization or slowdown of chemical reactions occurring due to thermal-oxidative effects. Under thermal exposure (without air access), the addition of synthetic ester to the aromatic oil in a volume of 30% or more significantly reduces the likelihood of sediment formation due to the destruction and polycondensation of aromatic hydrocarbons in mineral oil.
Analysis of the efficiency of the use thermal TSR based on the organic Rankine cycle in the production of nitric acid
Authors: Shelginsky Y. A. , Yavorovsky Y. V. , Shelginsky A. Y.
Published: July 2022

The paper shows an energy-saving effect based on on the organic Rankine cycle (ORC) when using thermal secondary energy resources (SER) for the production of non-concentrated nitric acid (NNA).The production of non-concentrated nitric acid in the Russian Federation is carried out on two types of aggregates: UKL-7 and AK-72. Each unit currently has upgraded versions: UKL-7M and AK-72M, in which the design production capacity has been increased. Nitric acid production at the UKL-7 unit is carried out at a uniform pressure of 0.716MPa at the stages of ammonia conversion and absorption of nitrous gases by water. Acid production on the AK-72 unit is carried out at different pressures at the stages of ammonia conversion and absorption. Ammonia conversion on the AK-72 unit proceeds at a pressure of 0.42 MPa, whereas the absorption process is carried out at a pressure of 1.1 MPa. In this paper, by way of example, the UKL-7 unit is considered. A useful use of SER based on the ORC is to use the heat of compressed air after the axial compressor, which is released into the environment. In this case, the heat of compressed air is used for heating and evaporation of freon in the evaporator of the cycle, heating feed water in front of the deaerator in order to reduce steam consumption. It is also proposed to use the heat of condensation of freon after the turboexpander to evaporate ammonia, which also leads to a reduction in steam consumption. It is proposed to use freon R600a in the ORC.The calculation results show that when using the heat of compressed air and the heat released in the EGU condenser, it is possible to generate about 2,613,600 kWh/ year of electricity, as well as save 39,630 tons of steam per year.
THE EFFECT OF SOME ATTRACTIVE MEDIA ON THE NUMBER OF MARRIAGE PARTNERS, EGGS WEIGHT AND LIFETIME OF BLACK SOLDIER FLY (Hermetia illucens L.)
Authors: Lamin Syafrina , Abrar Arfan , Arwinsyah Arwinsyah , Novita Sipahutar Agnes
Published: July 2022

The black soldier fly (BSF)  Hermetia illucens L.(Diptera:Stratiomyidae) is widely used in biorecycling organic waste has gained huge populatarity in different  industrial. And commercial sector  becouse of its excellent potential to treat organic waste and high biomass production.  The obstacle experienced during the rearing process was that a small number of eggs were obtained, therefore efforts were made to increase the black soldier fly population by providing bait in the form of attractants.  Media bait technique in the form of several media with a specific and pungent aroma, so that it will lure BSF females to mate, lay eggs, extend life time. The present study deal to investigation of different number of mating pairs, eggs weight dan lifetime as function respon of different lure media.This study used a completely randomized design (CRD) with (1) cassava tape, (2) Fermented bran (3) rotten pineapple (4) rotten banana media with each treatment repeated 6 times with the variables observed were the number of mating pairs of fly (per day), egg weight, and life span of imago.  each attractant medium had an effect on the number of mating females, the weight of the eggs laid and the length of life of BSF. The best medium was rotten pineapple media (number of mating pairs 55 pairs of BSF, and egg weight laid 0.007 per day) while the worst medium was fermented bran media with a long life (10.9 days)
Ambiente y su incidencia en los fenómenos organizacionales contemporáneos: un acercamiento desde la contingencia
Authors: Zarur Osorio Antonio Elías
Published: July 2022

El presente trabajo tiene como propósito evidenciar la relevancia que los factores del ambiente externo tienen en la práctica administrativa y bosquejo organizacional desde la teoría de las contingencias y el enfoque de las configuraciones expuesto por Mintzberg (1999). Dichas corrientes nos permiten concebir al fenómeno en su integralidad para explicar los procesos y el diseño organizacional ajustados a un conjunto de interrelaciones con la totalidad crecientemente compleja. Estas posturas nos permiten, además, utilizar la noción de entorno, para comprender lo contingencial. Con ese propósito, hemos dividido el documento en cinco partes: 1) La teoría de la contingencia. Donde se presenta a esta postura como un marco de referencia amplio para comprender la complejidad del fenómeno organizacional. 2) La estabilidad del entorno. Aquí, haremos referencia a la naturaleza permanentemente cambiante del entorno y los factores que lo hacen crecientemente turbulento. 3) La diversidad del entorno, sistemas de planificación y control. El concepto de entorno alude a una amplia gama de fenómenos y situaciones que afecta el diseño de las estrategias y la repercusión que estas tienen en el proceso administrativo y bosquejo de la estructura. 4) Hostilidad del entorno y dispositivos de enlace: un caso. Una característica del entorno tiene que ver con una serie de influencias que promueve la turbulencia creciente del ambiente cambiante, manteniendo a la organización en una situación de permanente ruptura de equilibrios. 5) Reflexiones finales.
Rentas, rentas y rentas...
Authors: Vila Tierno Francisco
Published: July 2022

Cuando todavía estamos debatiendo sobre la reforma laboral y de las Pensiones y analizando cuáles serán los próximos pasos habrían de darse en estas materias, nos topamos, de lleno, con un elemento que puede condicionar tanto los efectos de aquellas como su aplicabilidad. Nos referimos a la inflación. Una inflación que se mide con dos dígitos en la parte entera, más los correspondientes decimales.
Elective aortic arch surgery: cerebral perfusion flows and transient neurological dysfunctions
Authors: Berardi Marianna , Di Marco Luca , Leone Alessandro , Coppola Giuditta , Gliozzi Gregorio , Zanzico Federica , Brillanti Giorgia , Pacini Davide
Published: July 2022

Aims

Selective antegrade cerebral perfusion technique is a method of cerebral protection used worldwide during aortic arch surgery. This study was designed to identify a potential correlation between perfusion flows and the development of postoperative transient neurological dysfunctions.

Methods

From January 2015 to May 2020, 175 patients underwent elective surgical replacement of the aortic arch using selective antegrade cerebral perfusion at the Cardiac Surgery Unit of Sant’Orsola Hospital in Bologna. Considering that patients who developed a permanent neurological dysfunction and those who died before a possible evaluation of neurological status were excluded, the study population included 160 patients. The perfusion flows were collected and analyzed. Univariate and multivariate analyses were performed to identify the statistical risk factors involved in the onset of transient neurological dysfunctions.

Results

The study population was divided into two groups: 138 patients (86.3%) without and 22 (13.8%) with postoperative transient neurological complications. Among the intra-operative parameters collected in the study, the univariate analysis showed that the indexed medium perfusion flow of selective antegrade cerebral perfusion was significantly lower in the transient neurological dysfunctions group (11.63 ± 2.41 ml/kg/min vs 12.62 ± 2.39 ml/kg/min, P-value = 0.03). The multivariate logistic regression analysis showed that the female gender (P = 0.004, OR = 4.816, IC = 1.636–14.174) was predictor of transient neurological dysfunctions.

Conclusion

The results of the study showed that lower perfusion flows seem to be related to a higher probability of developing transient neurological dysfunctions. However, the analysis of a wider population is required to confirm these preliminary data.
Modified Haller index is inversely correlated with true positive exercise stress echocardiographic results
Authors: Sonaglioni Andrea , Nicolosi Gian Luigi , Rigamonti Elisabetta , Lombardo Michele
Published: July 2022

Aims

The influence of chest wall shape on exercise stress echocardiography (ESE) results has been poorly investigated. We aimed at evaluating the main predictors of true positive (TP)-ESE in a population of subjects with suspected coronary artery disease (CAD), categorized according to chest wall conformation, assessed by modified Haller index (MHI, chest transverse diameter over the distance between sternum and spine).

Methods

All consecutive patients with suspected CAD referred to our EchoLab for performing ESE between September 2011 and October 2021 were retrospectively enrolled. Preliminary assessment of both pretest probability (PTP) and MHI was performed. All patients with positive ESE underwent coronary angiography. Obstructive CAD was diagnosed by ≥70% stenosis in any epicardial coronary artery. Outcome was TP ESE result.

Results

One thousand two hundred and seventy-five consecutive patients (64.9 ± 13.0 years) entered the study. Subjects with concave-shaped chest wall (MHI > 2.5) (10.7%) and those with normal chest shape (MHI ≤ 2.5) (89.3%) were separately analyzed. PTP was similar in both groups (21.8 ± 13.2 vs. 23.5 ± 13.3%, P = 0.15). One hundred and seventy patients were diagnosed with positive ESE: 129 (75.9%) had obstructive CAD (TP), whereas the remaining 41 (24.1%) had no CAD. Only 2.3% of TP ESE was detected in subjects with MHI >2.5. PTP [odds ratio (OR) 1.03, 95% confidence interval (CI) 1.01–1.04], dyslipidemia (OR 4.37, 95% CI 2.81–6.80), dyssynergy in the left anterior descending territory (OR 8.21, 95% CI 5.07–13.3) were linearly correlated with TP ESE, whereas MHI >2.5 (OR 0.25, 95% CI 0.14–0.67) was inversely associated with outcome

Conclusions

Subjects with MHI >2.5 have low prevalence of TP ESE, regardless of PTP. Preliminary MHI assessment may reduce overestimation of PTP of CAD.
Outcome after surgical embolectomy for acute pulmonary embolism
Authors: Panholzer Bernd , Gravert Hanna , Borzikowsky Christoph , Huenges Katharina , Schoettler Jan , Schoeneich Felix , Attmann Tim , Haneya Assad , Frank Derk , Cremer Jochen , Grothusen Christina
Published: July 2022

Aims

Patients with pulmonary embolism (PE) and contraindications for or failed thrombolysis are at the highest risk for PE-related fatal events. These patients may benefit from surgical embolectomy, but data concerning this approach are still limited.

Methods

The method used here was retrospective data analysis of 103 patients who underwent surgical embolectomy from 2002 to 2020 at our department.

Results

Mean age was 58.4 (±15.1) years. Fifty-eight (56.3%) patients had undergone recent surgery; the surgery was tumor associated in 32 (31.1%) cases. Thirty (29.1%) patients had to be resuscitated due to PE, and 13 (12.6%) patients underwent thrombolysis prior to pulmonary embolectomy. Fifteen (14.5%) patients were placed on extra corporeal membrane oxygenation (ECMO) peri-operatively. Five patients (4.9%) died intra-operatively. Neurological symptoms occurred in four patients (3.9%). Thirty-day mortality was 23.3% (n = 24). Re-thoracotomy due to bleeding was necessary in 12 (11.6%) patients. This parameter was also identified as an independent risk factor for mortality.

Conclusion

Surgical pulmonary embolectomy resulted in survival of the majority of patients with PE and contraindications for or failed thrombolysis. Given the excessive mortality when left untreated, an operative approach should become a routine part of discussions concerning alternative treatment options for these patients.
BIM Engineering Management Oriented to Curve Equation Model
Authors: Shen Fei , Ma Qiang , Salama Mohamed
Published: July 2022

This article uses the curve equation model to describe the initial value problem of differential equations in BIM project management. A new set of rolling curve-solving models is established for step-aligning in BIM project management. Based on the premise that the differential equation can be solved numerically, we appropriately simplify or set the required relational functions in the equation. Finally, we use mathematical software to numerically solve the differential equation and obtain the discrete function of the rolling curve. The research shows that the accuracy of the step flatness and the width of the stepped groove formed by the rolling curve of the solution in this paper is better than the original solution.