bluuebunny/crossref_metadata_2025 huggingface dataset:
RESEARCH OF THE TETRARY COMPOUND Tb1-xNaxSn2 (x = 0,1) BY SINGLE CRYSTAL METHOD
Authors: Stetskiv A.O. , Pavlyuk V.V.
Published: July 2024

The crystal structure of the ternary phase Tb1-xNaxSn2 (x = 0,1) (a = 0,4412(1), b = 1,6314(2), c = 0,4314(1) nm), which belongs to the ZrSi2, просторова група, символ Пірсона) structure type (space group Cmcm, Pearson symbol oS12), was investigated by single crystal method using single crystal diffractometer XCALIBUR (Mo Ka-radiation). This structure was resolved by means direct method. Atomic and thermal displacement parameters are refined by SHELX-97.
For the synthesis of alloys with sodium, pieces of pure metals with a certain stoichiometric composition were pressed into tablets, which were placed in a tantalum crucible and placed in a resistance furnace with a temperature controller. The rate of heating from room temperature to 400 ºС was equal to 5 ºС per minute. At this temperature, the alloys were kept for two days, and then the temperature was increased from 400 ºС to 800 ºС for 1 hour. The obtained samples were annealed at the same temperature for 8 hours. The alloys were stored under a layer of indifferent oil, previously cleaned and dehydrated. Homogenizing annealing was carried out at a temperature of 200 °C for 480 hours.
The results of calculation and refinement of the crystal structure of compound Tb1-xNaxSn2 (x = 0,1) shown, that it is isostructural to the structural type ZrSi2, where Tb(Na) atoms form a statistical mixture and occupy the positions of Zr atoms, and Sn1 and Sn2 atoms occupy the positions of Si2 and Si1 atoms respectively.
The number of neighboring atoms correlates well with the size of the central atoms. The largest atoms of a rare earth metal (Tb) or an alkali metal (Na) when forming a statistical mixture are characterized by a coordination number of 10 and their atoms are arranged in the form of a distorted four-capped trigonal prism. The coordination polyhedron for the Sn1 atom is a double antitrigonal prism. For other tin atoms (Sn2), the coordination polyhedron in this structure is a trigonal prism. The shortest interatomic distances are typical for intermetallic compounds and their values ​​indicate the metallic type of bond.
EFFICIENCY OF EDUCATIONAL TECHNOLOGIES FOR TEACHING CHEMISTRY IN THE MODERN UKRAINIAN SCHOOL
Authors: Slyvka M.V. , Labatii T.V. , Bestritska V.O. , Korol N.I. , Tsan'ko M.Yu. , Stercho I.P. , Miliovych S.S. , Kryvov'jaz A.O. , Onysko M.Yu.
Published: July 2024

The development and quality of education in the country is an effective indicator of the state of its social development. Secondary education plays a key role in the training of highly qualified professional personnel, therefore, monitoring the effectiveness of teaching natural sciences, in particular chemistry, is extremely relevant and allows for a critical analysis of the quality of secondary school reform, which has been actively implemented in Ukraine in recent years. The work investigated and analyzed the effectiveness of teaching chemistry according to the traditional program of the standard level and according to the alternative scientific and educational program "Intellect of Ukraine", which widely implements innovative learning technologies in combination with elements of STEM education. The object of the study was selected 7-9 classes of secondary schools of the Transcarpathian region, which work exclusively according to the traditional program of teaching chemistry, exclusively according to the program of the scientific and educational project "Intellect of Ukraine" and secondary schools, which work according to a combined scheme (available classes, which study according to different programs ). Experimental data indicate that according to indicators such as the coefficient of the quality of knowledge and the degree of education of students, the classes that study according to the program of the scientific and educational project "Intellect of Ukraine" are 10-15% higher, which indicates a higher efficiency of learning chemistry by students 7- 9 classes.
Studi Tentang Regulasi Emosi pada Siswa Broken Home di SDN Pradah Kalikendal 3 Surabaya
Authors: Christiana Elisabeth , Sutanto Tiara Putri
Published: July 2024

This study aims to determine the level of emotional regulation of broken home students in elementary school, emotional regulation factors and the occurrence of broken home, the impact of emotional regulation, the need for guidance and counseling in elementary schools. The research conducted is a type of qualitative research with a case study approach. The subjects in this study were two students aged 8 and 10 years who were broken home students with characteristics of low emotional regulation at SDN Pradah Kalikendal 3 Surabaya. Data collection was carried out using observation, interview and documentation techniques. The results of this study concluded that elementary school students are still not able to control their emotional regulation due to broken home due to age factors where the use of some coping by venting negative behavior. Researchers conducted interviews first with all homeroom teachers in grades 1-6 before observing and interviewing students who experienced broken homes with lack of emotional regulation control at SDN Pradah Kalikendal 3 Surabaya.
Pengembangan E-Modul Karier Wirausaha Berbasis UMKM Lokal dengan Model Rowntree untuk Siswa SMAN 6 Sidrap
Authors: Nur Edil Wijaya , Saman Abdul , Buchori Sahril
Published: July 2024

This study aims to develop an E-Module for Entrepreneurship Career Guidance, based on local UMKMs, tailored for students at SMAN 6 Sidrap. Utilizing Rowntree's development model, the research integrates essential components from student needs analysis, collaboration with career counselors, and case studies of successful local entrepreneurs. The novel aspect of this E-Module lies in its focus on local UMKMs in Sidrap, providing students with relatable and inspiring examples of entrepreneurship. Findings indicate that the E-Module significantly enhances students' self-efficacy and interest in pursuing entrepreneurial careers. It also aligns with the Social Cognitive Career Theory (SCCT), supporting students in understanding entrepreneurial opportunities and fostering realistic career expectations. By including practical simulations and real-life success stories, the E-Module creates a dynamic and engaging learning environment, demonstrating its effectiveness as a career guidance tool.
Young Malaysian Muslims' online shopping intention and behaviour
Authors: Wan Nawang Wan Rasyidah ,   Faculty of Economics and Muamalat, Universiti Sains Islam Malaysia, 71800 Nilai, Negeri Sembilan, Malaysia, Muhamed Shukri Muhammad Huzairil Syaqir ,   Faculty of Economics and Muamalat, Universiti Sains Islam Malaysia, 71800 Nilai, Negeri Sembilan, Malaysia
Published: July 2024

The internet's commercialization in 1991 marked the beginning of ecommerce, with online shopping rapidly growing among Malaysians, especially the young. The aim of this study is to explain the online shopping intention and behaviour of young Muslim consumers in Malaysia. An online survey was used to collect data from a convenience sample of young Muslims with prior online shopping experience. A regression analysis was conducted to analyse the data. The results show that security and safety and loyalty are the factors that influence online shopping intention, while attitude, trustworthiness, and marketing information do not. Online shopping intention has also been shown to be a predictor of online shopping behaviour. This study contributes to theory while highlighting practical implications for academics and practitioners in the fields of marketing, consumer behaviour, and online shopping.
Persepsi Peserta Didik Terhadap Kemampuan Tenaga Pendidik Dalam Mengaplikasikan Multimetode Pembelajaran Pada Mata Pelajaran Fisika
Authors: Zia'ul Khaerul Qasyaf  , Sudirman  , Baharuddin
Published: July 2024

Tujuan penelitian ini dilakukan adalah untuk mengetahui gambaran mengenai bagaimana persepsi peserta didik terhadap kemampuan tenaga didik dalam mengaplikasikan multimetode pembelajaran pada mata pelajaran fisika di SMA Negeri Kabupaten Sinjai. Penelitian yang digunakan adalah mix methode dengan menggunakan pendekatan fenomenologi. Populasi dalam penelitian ini adalah peserta didik kelas XI IPA SMA Negeri Kabupaten Sinjai, yaitu SMA Negeri 2 Sinjai, SMA Negeri9 Sinjai dan SMA Negeri 12 Sinjai. Jumlah sampel yang diambil adalah sebanyak 60 orang, dimana setiap sekolah diwakili 20 orang peserta didik. Selanjutnya penulis menggunakan tiga metode pengumpulan data, yaitu angket, wawancara, dan dokumentasi.Hasil penelitian ini menunjukkan bahwa 1) Persepsi peserta didik terhadap kemampuan tenaga pendidik dalam mengaplikasikan multimetode pembelajaran pada mata pelajaran fisika di SMA Negeri Kabupaten Sinjai berada pada kategori baik, dimana tenaga pendidik sudah menggunakan metode pembelajaran yang variatif dalam proses pembelajaran. Namun, ada beberapa metode pembelajaran yang belum maksimal penerapannya, misalnya metode metode eksperimen. 2) Jenis metode pembelajaran yang digunakan tenaga pendidik dalam pelajaran fisika di SMA Negeri Kabupaten Sinjai tergolong beragam. Adapun metode pebelajaran yang digunakan yaitu, metode Drill, Project Based Learning, tanya jawab, metode ceramah, Discovery Learning, diskusi kelompok, dan metode demonstrasi.Implikasi dari penelitian ini adalah diharapkan agar hasil penelitian ini adalah 1) Pertimbangan bagi tenaga pendidik mata pelajaran fisika untuk dapat menggunakan multimetode pembelajaran, agar dapat meningkatkan antusias peserta didik dan hasil belajar peserta didik. 2) Guna penelitian selanjutnya, diharapkan agar peneliti dapat lebih fokus terhadap metode-metode pembelajaran yang digunakan oleh tenaga pendidik.
PERBANDINGAN KEMAMPUAN PEMECAHAN MASALAH FISIKA BERDASARKAN TEORI POLYA ANTARA KELAS XI MIA SMAN 7 DAN MAN 2 BULUKUMBA
Authors: Hidayat Muhammad Yusuf , Suarti Suarti , Rahma Muftihatur
Published: July 2024

Penelitian ini bertujuan untuk mengetahui kemampuan pemecahan masalah fisika berdasarkan teori Polya kelas XI MIA SMAN 7 Bulukumba, mengetahui kemampuan pemecahan masalah fisika berdasarkan teori Polya kelas XI MIA MAN 2 Bulukumba, dan mengetahui perbedaan antara kemampuan pemecahan masalah fisika berdasarkan teori Polya kelas XI MIA SMAN 7 dan MAN 2 Bulukumba.
Jenis penelitian ini adalah Ex Post Facto dengan desain kausal komparasi. Subjek pada penelitian ini adalah kelas XI MIA SMAN 7 dan MAN 2 Bulukumba. Instrumen yang digunakan adalah instrumen tes kemampuan pemecahan masalah berdasarkan indikator Polya.
Hasil analisis deskriptif menunjukkan bahwa nilai rata-rata kemampuan pemecahan masalah fisika peserta didik kelas XI MIA SMAN 7 Bulukumba yaitu 63,88. Sedangkan nilai rata-rata kemampuan pemecahan masalah fisika peserta didik kelas XI MIA MAN 2 Bulukumba yaitu 74,36. Berdasarkan hasil rata-rata yang diperoleh pada SMAN 7 dan MAN 2 Bulukumba, terdapat perbedaan antara kemampuan pemecahan masalah fisika berdasarkan teori Polya kelas XI MIA SMAN 7 dan MAN 2 Bulukumba.
IMPLEMENTATION OF FULL COST RECOVERY AND PERFORMANCE BASED REMUNERATION PERUMDA AIR MINUM TIRTA AMPERA BOYOLALI
Authors: Asmono Insan Adi , Wuryanto Y. Agung Tri Sulisto , Muhrom Ali  , Novianto Johan
Published: July 2024

The implementation of Full Cost Recovery and Performance-Based Remuneration at Perumda Tirta Ampera Boyolali is a real step and best practice in BUMD Drinking Water governance. Tariff adjustments and governance reforms, especially performance-based remuneration, with static performance incentive patterns and dynamic incentives, performance deduction factors, individual performance and group performance and measurement of achievements or performance results. Performance-based remuneration is also followed by an Efficiency Work policy that is expected to reduce water loss (NonRevenue Water/NRW). The results of the tariff adjustment and performance-based remuneration have been positive. Based on 2002 and 2003 performance, there was an increase in performance from 3.12 to 3.39 contributed by service aspects, reduced water loss, increased customer connection water pressure, increased water meter replacement and human resource training. This policy has an impact on a significant increase in local revenue of Rp.493,137,143.50 fulfillment of employee rights which previously the company paid welfare benefits (50%) in 2022, in 2023 it can fulfill 100% welfare benefits, year-end incentives, incentives for Eid al-Fitr and Christmas.
INFLUENCE OF FINANCIAL REPORT QUALITY, AUDIT QUALITY, AND ENVIRONMENTAL, SOCIAL, AND GOVERNANCE ON INVESTMENT EFFICIENCY
Authors: Chandra Jesica Amalia , Handoko Jesica , Mokoginta Dirgantara Dahana
Published: July 2024

Research was conducted to identify and analyze the impact of financial report quality, audit quality, and Environmental, Social, and Governance (ESG) on investment efficiency with company size, leverage, and industry type as control variables. The data in this research are quantitative data obtained secondarily from the annual reports of non-financial companies listed on the IDX for the 2020-2022 period and ESG scores published by Bloomberg Terminal. The data were analyzed with multiple linear regression models and processed using SPSS software version 23. The findings of this research are that financial report quality and audit quality have a significant and positive impact on investment efficiency, while ESG has no impact on investment efficiency. These findings are expected to provide additional knowledge and empirical evidence related to factors that have an impact on investment efficiency and provide knowledge for companies and investors in order to make the right decisions regarding efficient investment. This research has limitations, namely using ESG scores from Bloomberg where the data obtained is the final result so that the value of its various aspects, namely environmental, social, and governance, is unknown. This means that it is not known specifically what aspects of the company are good. This research does not classify investment efficiency into overinvestment, underinvestment, and efficient conditions.
Pengembangan E-Modul Fisika Berbasis Problem Based Learning pada Materi Fluida Statis untuk Siswa SMA
Authors: Karien Herlina Wiandari  , Hakim Lukman , Sulistyowati Rita
Published: July 2024

Mengembangkan bahan ajar yang menarik serta interaktif sangat membantu dalam proses pembelajaran. Tujuan penelitian ini adalah menghasilkan bahan ajar berupa e-modul interaktif untuk materi fluida statis terhadap siswa SMA kelas XI yang valid, praktis dan memiliki efek potensial. Metode penelitian yang digunakan yaitu Research and Development (R&D) dengan model pengembangan Rowntree yang memiliki beberapa tahapan yaitu : self evaluation, expert review, one to one, small group dan field test. Teknik pengumpulan data menggunaka angket respon untuk menguji kevalidan dan kepraktisan produk. Hasil rata-rata yang diperoleh dari evaluasi ahli materi dan media (90%dan 90,55%) dan hasil pada tahap uji coba one to one dan small group (95% dan 88,5%). Hasil penelitian menunjukkan e-modul yang dikembangkan sangat valid dan praktis. Untuk nilai N-Gain diperoleh rata-rata sebesar 0,64 dengan kategori sedang.
Analisis Manfaat Program AKLAM dalam Peningkatan Pemanfaatan Laboratorium Fisika
Authors: Qaddafi Muhammad , Anggereni Santih , Ikbal Muh. Syihab , Ali Mukti , Akbar Nur Ika
Published: July 2024

Penelitian ini merupakan penelitian Mixed Methods dengan desain penelitian concurrent triangulation, Tujuan penelitian ini adalah: 1)Untuk mengetahui gambaran penataan tata kelolah laboratorium sekolah pasca aplikasi kerja laboratorium mahasiswa (AKLAM) program studi Pendidikan Fisika UIN Alauddin Makassar di wilayah Takalar dan Bulukumba”; 2)Untuk mengetahui gambaran pemanfaatan laboratorium sekolah pasca aplikasi kerja laboratorium mahasiswa (AKLAM) program studi Pendidikan Fisika UIN Alauddin Makassar di wilayah Takalar dan Bulukumba”; 3)Untuk mengetahui kontribusi apa yang telah diperoleh sekolah setelah pelaksanaan Aplikasi Kerja Laboratorium Mahasiswa (AKLAM) program studi pendidikan fisika UIN Alauddin Makassar di wilayah Takalar dan Bulukumba”. Subjek penelitian ini adalah satu Madrasah Aliyah dan satu sekolah menengah pertama dengan menggunakan angket berupa lembar ceklis dan lembar wawancara maka hasil analisis yang diperoleh yaitu:1) untuk tata kelola pasca AKLAM ada dua sekolah yang masih cukup sesuai dengan standarisasi laboratorium sekolah dan ada satu sekolah yang sudah tidak sesuai dengan standarisasi laboratorium sekolah ; 2) untuk pemanfaatan laboratorium pasca AKLAM yaitu pemanfaatan laboratorium sebagai tempat praktikum masih tetap dipertahankan; 3) untuk kontribusi yang diperoleh masing-masing pihak sekolah pasca AKLAM sangat positif.
Implementation of The Snowball Throwing Learning Model Newton's Law Physics Song Assisted on Interest and Learning Outcomes
Authors: Sulaiman Umar , Aeni Nur Aeni , Ferawati Andi
Published: July 2024

Penelitian bertujuan untuk mengetahui gambaran minat dan hasil belajar peserta didik yang diajar dengan model pembelajaran snowball throwing berbantuan lagu fisika Hukum Newton, untuk mengetahui perbedaan minat dan hasil belajar yang diajar dengan model pembelajaran snowball throwing dengan yang diajar menggunakan model konvensional. Jenis penelitian quasi eskperimen dengan desain posstest only control group desain. Populasi penelitian yaitu peserta didik kelas X SMAN 1 Jeneponto. Instrument penelitian adalahangket respon dan tes hasil belajar. Analisis deskriptif kelas eksperimen kategori sangat tinggi dan kelas kontrol kategori tinggi. Analisis inferensial menggunakan uji t diperoleh thitung 4,68 < ttabel 2,04 Ini menunjukkan H0 ditolak dan Ha diterima atau terdapat perbedaan hasil belajar peserta didik. Implikasi pada penelitian ini yaitu pertimbangan bagi tenaga pendidik dalam menggunakan model pembelajaran snowball throwing berbantuan lagu fisika, pendidik dapat menggunakan model pembelajaran yang berbeda, bagi peneliti lain dapat dijadikan refrensi untuk penelitian lebih lanjut.
Karakterisasi Sifat Fisis dan Mekanis Komposit Berbahan Sabut Lontar dalam Aplikasi Papan Partikel
Authors: Syamsuddin Sahara , Kusmiran Amirin , Fajar Fajar , Apriliah Risky
Published: July 2024

This research used the natural fiber of the Palmyra fruits for composite particle manufacturing, and the physical and mechanical properties were studied on these composite particles. Raw material manufacturing uses the hand lay-up technique with a uniform volume fraction and random fiber in the composite. The presentations of the ratio composition of both fibers of palmyra fruits and epoxy resin are 75:25 for sample A, 70:30 for sample B, 65:35 for sample C, 60:40 for sample D, and 55:45 for sample E. This research shows that densities of the sample A to sample E are in range 0.47 g/cm3 to 0.60 g/cm3, and a sample A has the highest development thickness, with 72.61%, and the lowest is in sample C, with 33.11 %. Water content testing shows that samples A, B, C, and E have range 2.75 % to 7.52 %, and sample D is 17.30 %. For modulus of rapture (MOR), sample A has higher MOR than sample B, C, D, and E. Whereas sample D has lower MOR than the other samples. Sample C has the highest value for modulus of elasticity (MOE), 5526.47 kg/cm2. This sample's high modulus of elasticity correlates with the percentage of thickness development where the percentage of thickness development of sample C is lowest at 33.11%.  The analysis results with AND or OR logic show that samples A, B, and D does not match  SNI 03-2105-2006 standards while C and E samples match with SNI 03-2105-2006 standards. Thus, the three samples are not recommended for development. While C and E samples can be developed into particle board by reducing moisture content and improving elasticity properties.
Mathematical model of a three-stage vacuum ejector system
Authors: Matysko Robert
Published: July 2024

This paper presents a mathematical model of a vapour vacuum system, which is a crucial component of steam power plants of critical importance for energy efficiency. This system consists of three stages, with each stage containing a steam ejector and a gas phase separator in the form of an interstage heat exchanger. The primary purpose of this system is to remove inert gases and maintain the appropriate level of vacuum in the power plant condenser. The presented mathematical model can be used to analyse the operation of the vacuum system in a steady state. Preliminary pressure calculations in various components of the vacuum system show the influence of additional measurement orifice resistance on the vacuum drop in the condenser, which can reduce the efficiency of the entire energy system. It is worth noting that the presented model can be used as a tool for analysing elements of the vacuum system in energy systems.
Research of the physical properties of bio-based building materials with phase change material
Authors: Wendołowicz Mateusz , Mikos-Nuszkiewicz Natalia , Cieślikiewicz Łukasz , Sinka Maris , Bajare Diana , Łapka Piotr
Published: July 2024

This article presents the results of experimental measurements of the physical properties of new environmentally friendly bio-based composite building materials containing hemp shives bonded with a magnesium binder. Some of the tested materials contained an admixture of phase change material (PCM) of variable proportions in the binder to increase the heat capacity of building elements (walls), which can positively affect room temperature regulation. Densities and porosities are key parameters describing building materials, directly affecting mechanical, acoustic, and, most importantly, hygro-thermal properties, including thermal conductivity, water vapor permeability, water absorptivity, and sorption curves. The experiment was carried out for ten different samples of bio-based building composites, differing in the bulk density ob-tained during the manufacturing process and in the PCM proportion. As part of the experiment, true density tests were conducted on a helium pycnometer. Then, the geometric densities of the tested materials (which may differ from the bulk density obtained during production) were measured using the Archimedes method, making it possible to obtain the total, closed, and open porosity values. Tests were also carried out for selected traditional building materials, such as red brick and autoclaved aerated concrete, to compare the results obtained.
Unsteady flow of a couple stress fluid due to sudden withdrawal of pressure gradient in a parallel plate channel
Authors: Anjali Donga , Reddimalla Naresh , Ramana Murthy Josyula Venkata
Published: July 2024

The investigation of the couple stress fluid flow behaviour between two parallel plates under sudden stoppage of the pressure gradient is considered. Initially, a flow of couple stress fluid is developed between the two parallel plates under a constant pressure gradient. Suddenly, the applied pressure gradient is stopped, and the resulting unsteady flow is studied. This type of flow is known as run-up flow in the literature. Now the flow is expected to come to rest in a long time. Usually, these types of problems are solved by using the Laplace transform technique. There are difficulties in obtaining the inverse Laplace transform; hence, many researchers adopt numerical inversions of Laplace transforms. In this paper, the problem is solved by using the separation of variables method. This method is easier than the transform method. The velocity field is analyti-cally obtained by applying the usual no-slip condition and hyper-stick conditions on the plates, and hence the volumetric flow rate is derived at subsequent times. The steady state solution before the withdrawal of the pressure gradient is matched with the initial condition on time. The rest time, i.e. the time taken by the fluid to come to rest after the pressure gradient is withdrawn is calculated. The graphs for the velocity field at different times and different couple stress parameters are drawn. In the special case when a couple stress parameter approaches infinity, couple stress fluid becomes a viscous fluid. Our results are in good agreement with this special case.
Analysis of entropy generation in unsteady flow of nanofluids past a convectively heated moving permeable cylindrical surface
Authors: Chokoe Itumeleng , Makinde Oluwole Daniel , Monaledi Ramotjaki Lucky
Published: July 2024

This paper investigates entropy generation rate in a temperature-dependent variable viscosity unsteady nanofluid flow past a convectively heated impulsively moving permeable cylindrical surface. The governing equations based on the modified Stokes first problem assumption are obtained and transformed using appropriate similarity variables into nonlinear ordinary differential equations. The numerical shooting method together with the Runge-Kutta Fehlberg integration scheme are employed to effectively solve the problem. The effects of related parameters on the nanofluid velocity, temperature, skin friction, Nusselt number, entropy generation rate and Bejan number are displayed graphically and quantitatively explained. It is found that an upsurge in nanoparticles volume fraction enhances the skin friction, Nusselt number, entropy production rate and the Bejan number.
Evaluation of degradation factor effect on solar panels performance after eight years of life operation
Authors: Obaid Ali Hussein , Mahdi Emad Jaleel , Hassoon Isam Azeez , Hussein Hussein Fawzi , Jasime Adil Abd Al-Sahib , Jafarf Ammar Noori , Abdulghanig Ali Sabih
Published: July 2024

Most high-quality solar panel products suffer from performance degradation at an annual rate of 0.4–0.5% per year during their specified normal operational life of 25–30 years. This percentage increases in areas with hot climates and roof photovol-taic systems and varies according to the quality, guarantee and reliability of the solar panel manufacturers. The aim of this research is to assess the degradation rates of solar panels in the city of Baghdad and to determine their impact on the investment feasibility of residential systems under hot climatic conditions. In this research, an evaluation of performance of photovoltaic solar panels working in a 2 kWp system connected to the electrical grid was done under the operational climatic conditions in the evaluation area (Baghdad, Iraq). The degradation rate of all photovoltaic system modules during the operation time from 2015–2023 is equal to 4.74% (0.593% / year). For comparison, a new monocrystalline solar panel of power 185.94 Wp with an old solar panel of monocrystalline type of power 183.33 Wp (which previously was installed in 2015) were installed at the same tilt angle of 30o, and evaluated during the operation months starting in March and ending in November of the year 2023. The degradation rates per year of an aged solar panel were determined to range from 0.441% to 0.850%, with an average value of 0.788% per year. After undergoing a correction process to align the maximum power values of the old and new solar panels, the corrected degradation rates per year values ranged from 0.391% to 0.684% per year, with an average value of 0.621% per year, which closely matches the degradation rate of all photovoltaic system modules at 0.593% per year.
Comparative thermo-hydraulic analysis of periodic stepped open micro pin-fin heat sink
Authors: Bhandari Prabhakar , Vyas Bhavesh , Padalia Diwakar , Ranakoti Lalit , Prajapati Yogesh Kumar , Bangari Raghubeer Singh
Published: July 2024

There is no doubt that the miniaturization of various electronic devices, including processors, servers, micro-electromechan-ical system devices, etc. has resulted in increased overall performance. However, there is a major problem with thermal management in these devices, as well as in many others. One of the most promising solutions is liquid cooled microchannel heat sink. In the current work, different cases of open micro pin-fin configurations of heat sink were considered. The con-figurations considered were a uniform height micro pin-fin heat sink, three-stepped unidirectional micro pin-fin heat sink and three-stepped bi-directional micro pin-fin heat sink. These configurations were also oriented in two dissimilar fashions, i.e. inline and staggered, so the total of six heat sink configurations are compared and analysed. Using single phase water as a coolant and copper as a substrate, these configurations were simulated numerically for different Reynolds numbers (10−160) under heat flux of 500 kW/m2. It can be concluded that at low Reynolds numbers, steepness does not contribute much in both inline and staggered arrangements, while at higher Reynolds numbers, 3 stepped staggered configurations has revealed the best performance due to boosted fluid mixing and more projecting secondary flow. Furthermore, bi-direction-ality in steepness shows augmented performance only in inline arrangement.
PENGARUH MODEL PEMBELAJARAN READ, ANSWER, DISCUSS, EXPLAIN, AND CREATE (RADEC) TERHADAP HASIL BELAJAR SISWA PADA MATERI SISTEM PENCERNAAN MANUSIA DI KELAS V SD NEGERI 29 BANDA ACEH
Authors: Irawan Anadia Syarifah , Tursinawati Tursinawati , Safiah Intan
Published: July 2024

The problem that occurs in class V is that students' science and science learning outcomes are still low, one of which is because teachers rarely use appropriate and interesting learning models in teaching science and science material, especially the human digestive system. Therefore, it is necessary to renew learning styles that involve students actively and improve students' science learning outcomes, especially material on the human digestive system. So, a learning model was used in this research, namely the Read, Answer, Discuss, Explain, and Create (RADEC) learning model. This research aims to determine the effect of the Read, Answer, Discuss, Explain, and Create (RADEC) learning model on student learning outcomes on human digestive system material in class V of SD Negeri 29 Banda Aceh. The approach in this research is a quantitative approach, a type of quasi experimental design in the form of a nonequivalent control group design. Sampling used a total sampling technique with class VA (experimental class) totaling 29 students and VB (control class) totaling 28 students. This research instrument is a multiple choice test with 10 questions and a description of 5 questions. The data collection technique uses tests in the form of pretest and posttest, data analysis techniques assisted by SPSS t-test independent sample test. The results of the independent t-test obtained a significance value (2-tailed) of 0.000 0.05. So the decision making criteria are Ha accepted and Ho rejected. So, it can be concluded that there is an influence of the Read, Answer, Discuss, Explain, and Create (RADEC) learning model on student learning outcomes in the human digestive system material in class V of SD Negeri 29 Banda Aceh
Study on the Development of Lower Limb Strength Using XBODY Technology
Authors: DINU-CRISTINESCU Ștefan ,   National University of Physical Education and Sport, TUDOR Virgil , PETRE Răzvan-Liviu ,   National University of Physical Education and Sport,   National University of Physical Education and Sport
Published: July 2024

The use of XBody technology in Romania is a widespread social phenomenon due to which millions of people benefit from its positive effects. The purpose of this study is to develop lower limb strength through EMS (Electrical Muscle Stimulation) technology using fitness exercises and XBody training equipment for the population of Bucharest and the population living around the capital city. Thus, we aim to provide these people with a healthier lifestyle by both developing their lower body muscles and getting them used to the regular practice of XBody training twice a week during their free time, under the supervision of EMS fitness specialists. Integrating people into society, into their group of friends and fellow workers is a priority for XBody experts from Bucharest, and this scientific approach wants to offer support to sedentary people. When designing the XBody programme for the development of lower limb strength, we will consider some principles and rules such as: Using the Wall Test to assess lower limb strength; Analysing health status; Analysing lifestyles through medical check-ups or cardiac investigations followed by own investigations; Adapting XBody programmes to current health status, physical fitness, daily schedule, and medical history. The methods used in this paper are data processing and interpretation; the comparative study of the information collected during the initial and final testing of the Wall Test applied to the participants willing to develop their lower limb strength because of XBody training. The analysis carried out led us to the conclusion that the development of lower limb strength was greatly improved through XBody technology.
Breakdance from Street Performance to Olympic and Art Stage
Authors: POP Cristiana ,   Bucharest University of Economic Studies
Published: July 2024

Breakdance appeared, like hip-hop, in the 70s in South Bronx borough (New York) and was an energetic dance with acrobatic elements alternanting with complicated and fast footwork. In the next decade several new acrobatic moves, never practiced before, were introduced in breakedance performances: head spins, back spins, or hand glides. Breakdancing has its own unique culture, history, and jargon, but within the breaking community there have always been those who focus on the artistic and creative side of it, and others who thrive on competition and contests. Nowadays breaking is inspiring many modern and classical form of performances and dance. Furthermore breakdance will be the only dance style in the 2024 Olympic program. The best 16 B-boys and 16 B-girls will compete for Olympic medals, being judged on criteria like: performance, creativity, technique, variety, personality, and musicality.
Research on the Opinion of Secondary School Students and Teachers of Physical Education and Sports about Street Dance
Authors: DUMITRU Eduard Ștefan ,   National University of Physical Education and Sport, TUDOR Virgil , DINA Liliana , STĂNESCU Monica ,   National University of Physical Education and Sport,   National University of Physical Education and Sport,   National University of Physical Education and Sport
Published: July 2024

This paper presents a starting point in the authors' journey towards the creation of a programme for a Physical Education and Sport elective that includes elements of Hip Hop Culture, specifically a Street Dance elective. The practice of Street Dance can bring innumerable benefits to students in Romanian schools, as it has already been demonstrated that dancing has a positive impact on both the physical and psychological human being. Whether we are talking about improving psychomotor capacities or cognitive abilities, dance can have a positive impact on a person's life and more than that, it can also help a person's social integration. The opinion of potential participants in this activity, teachers and students, is a very important point of interest, and it is of interest to find out their position on this phenomenon.
Physical Fitness Status among University Students from the Technical Profile
Authors: VOINEA Andreea ,   Bucharest University of Economic Studies, GRIGOROIU Carmen , DINCIU Corina ,   National University of Science and Technology Politehnica of Buchares,   Bucharest University of Economic Studies, Romania
Published: July 2024

The aim of the study was to determine and to describe the physical fitness level of the university students from the technical profile. The study was conducted on a sample of 403 students (n = 403) including 273 males and 130 females, aged between 18 and 20 years, from the National University of Science and Technology Politehnica of Bucharest. The level of physical fitness was assessed by the results in exercises that characterize the development of basic physical qualities such as: agility, flexibility, speed and power. Unpaired T-test was used to compare the difference between the mean of male and female students. The significance for all statistical tests was set at p<0.05. The results obtained show that there are statistically significant differences between male and female subjects across all applied tests. The study highlights that females’ physical fitness overall results are significantly lower than that of male students. Overall, the analysis of the obtained data by comparison with tests requirements reveal decreased physical performance in most applied tests, in both male and female students.
Coaching Behavior, Coach-Athlete Relationship, and Sports Results
Authors: GRIGOROIU Carmen ,   National University of Science and Technology Politehnica of Bucharest, VOINEA Andreea , DOMINTEANU Teodora ,   Bucharest University of Economic Studies, Romania,   Bucharest University of Economic Studies, Romania
Published: July 2024

This study investigates coach behavior, athlete-coach relationship and athlete performance results by coach’s age, gender, nationality, and number of coaches with whom the athlete collaborated and the connection between them. 164 athletes from different sports participated in the survey. Data were collected using a self-administered questionnaire, in Google Forms. The questionnaire used items from CBS-S and CARM-Q. The responses were coded and interpreted in SPSS for statistical relevance. Study findings were that coaching behavior, athlete-coach relationship and sports results have a positive correlation and are influenced by the coach’s age and the number of coaches with whom the athlete collaborated. Athlete’s results in sports are influenced by the coach’s nationality too.
Memoria cultural y prácticas culinarias de los excombatientes de las FARC en Colombia
Authors: Nocua-Caro Diana Priscila , Andrés-Llano Fabián
Published: July 2024

Objetivo: describir las principales perspectivas de los estudios sobre la memoria en relación con los acuerdos de paz, sus marcos jurídicos y los efectos de estas discusiones mediante el análisis de los vínculos teóricos entre las categorías de excombatiente, memoria cultural y prácticas culinarias. Metodología: enfoque cualitativo, mediante un proceso documental que implicó la sistematización, clasificación y organización de corte comprensivo, donde se analizaron las principales tesis y argumentos de los estudios más relevantes sobre la memoria del conflicto en Colombia entre 2016 y 2023. Resultados: las cocinas de la guerra y las prácticas culinarias de los excombatientes permiten reconocer los caminos que ponen en tensión los marcos de producción de verdad a través de la memoria cultural, coadyuvando al abordaje de perspectivas más cotidianas para la construcción del relato histórico. Limitaciones: se presentan resultados parciales del proceso. Conclusiones: se proponen vínculos teóricos entre las categorías de excombatiente, memoria cultural y prácticas culinarias. Las prácticas culinarias en la guerra y los recuerdos culturales asociados a los sabores, olores y colores resultan modos de explicación asociados a formas de hacer la comida que proporcionan nuevas comprensiones sobre el fenómeno de la violencia, la paz y la reconciliación.
PREVALENCE OF MASK USE DURING EXERCISE AT PUPUTAN MARGARANA RENON FIELD, DENPASAR CITY DURING THE COVID-19 PANDEMIC
Authors: Purnamsidi Wilbert , Dinata I Made Krisna , Adiatmika I Putu Gede , Sugianto Alena Juliani
Published: July 2024

The Covid-19 pandemic requires people to wear masks as a preventive measure. In addition, exercise is also highly recommended because it can prevent metabolic and infectious diseases by boosting the immune system. During this period, the government issued several regulations regarding the obligation to wear masks which certainly affected people's sports activities, especially in public spaces such as Puputan Margarana Renon Field, Denpasar City. This study was conducted by means of visual observation to count the number of people who use masks and the types of masks used when exercising. The observations made obtained a total sample of 2023 people. A total of 737 people (36.43%) used masks while 1286 people (63.57%) did not use masks. This low prevalence of mask use can be based on several factors such as concern, discomfort, and non-compliance. The 737 mask users are divided into several types of masks used, including surgical masks (45.45%), KF94 masks (17.91%), duckbill masks (17.91%), cloth masks (8.01%), scuba masks (4.48%), and cloth mask with valves (0.81%). Each of these masks has its advantages assessed through the aspects of effectiveness, price, tightness, and various other aspects. Through this study, it can be concluded that the prevalence of using masks when exercising at Puputan Margarana Renon Field, Denpasar City is still quite low (36.43%) with the most commonly used masks being surgical masks (45.45%).
EFFECTIVENESS OF WEB-BASED PROGRESSIVE MUSCLE RELAXATION (PMR) ON SLEEP QUALITY IN PATIENTS BREAST CANCER UNDERGOING CHEMOTHERAPY
Authors: Amelia Weny , Sari Dian Febrida , Syahid Armein , Espasari .
Published: July 2024

Breast cancer is the uncontrolled growth of cells or tissue in the breast. Chemotherapy is the first therapeutic choice for treating cancer. One of the symptoms felt by breast cancer patients undergoing chemotherapy is a decrease in sleep quality. Sleep quality is a person's sense of satisfaction with their sleep. Decreased sleep quality can reduce the body's immune system to fight developing cancer cells. The recommended nursing action to overcome sleep disorders in breast cancer patients undergoing chemotherapy is web-based progressive muscle relaxation (PMR). PMR is a technique that focuses attention on muscle activity, by identifying tense muscles and then reducing tension by performing relaxation techniques to get a relaxed feeling. The aim of this study was to determine the effectiveness of web-based PMR on sleep quality in breast cancer patients undergoing chemotherapy at RSUP Dr. M. Djamil Padang. The research design uses a quasi-experiment in the form of a one group pretest-posttest approach. The sampling technique was purposive sampling with a sample size of 25 people. Sleep quality was assessed using the Pittsburgh Sleep Quality Index (PSQI). Statistical test using Paired T-Test. The results showed a significant effect of web-based progressive muscle relaxation (PMR) on sleep quality in breast cancer patients undergoing chemotherapy (p value = 0.000; ? < 0.05). In this study, it can be concluded that there is an influence of web-based progressive muscle relaxation (PMR) on sleep quality in breast cancer patients undergoing chemotherapy at RSUP Dr. M. Djamil Padang. This study recommends web-based progressive muscle relaxation (PMR) as an independent nursing intervention to improve sleep quality in breast cancer patients undergoing chemotherapy.
 
Keywords: Progressive Muscle Relaxation (PMR); breast cancer; chemotherapy; sleep quality
LABORATORY EXAMINATION OF TYPHOID FEVER PATIENT AT PROF. NGOERAH GENERAL HOSPITAL IN 2020-2022
Authors: Erawan Kadek Khrisna Fernanda , Putu Ayu Patria Dewi Pande , Gde Diah Dharma Santhi Desak , Kadek Mulyantari Ni
Published: July 2024

Typhoid fever is systemic infection which is caused by Salmonella typhi. The gold standard of typhoid fever diagnosis is blood culture examination. Blood culture examination has a weakness, it could not be practically performed especially due to lack of laboratory facility. There are several others alternative examination including serology and hematology examination that could be used in supporting typhoid fever diagnosis. Therefore, investigation of hematology and serology examination results of typhoid fever patient is required. The type of research carried out was descriptive research with a cross-sectional design using secondary data from medical records of typhoid fever patients at Prof. Ngoerah General Hospital. A total of 52 patients with a diagnosis of typhoid fever as research subjects were taken using a total sampling technique. Following data were obtained: age, gender, serology and hematology examination result, type of antibiotics given, and complications found. Data processing was carried out using the SPSS ver. 26 with univariate analysis. This study found that typhoid fever patient at Prof. Ngoerah General Hospital tend to have normal hematological examination result including hemoglobin level, total count of leukocyte (neutrophile and lymphocyte) and thrombocyte. Widal test result of the patients showed the lowest titer value is 1/80 and the highest is 1/320 at O and H titers. Most of the patients have positive IgM anti-Salmonella typhi score of 4 and 6. 3 patients (5.8%) have negative IgM score of 2 and 11 patients (21.2%) did not have an IgM test. Most of the patients acquired antibiotic treatment with ceftriaxone become most used antibiotic. Complication is rarely occurred among the patients. Hepatomegaly is the most frequent complication occurred among the patients with complication.
The Correlation Between Lipid Profiles with Length of Stay and Clinical Outcomes of Ischemic Stroke Patients at Prof. Dr. I Goesti Ngoerah Gde Ngoerah General Hospital
Authors: Indrayani Pande Kadek Putri Rahayu , Yasa I Wayan Putu Sutirta , Lestari Anak Agung Wiradewi , Wande I Nyoman
Published: July 2024

Ischemic stroke is a neurological condition due to the blockage of cerebral arteries or veins, leading to disrupted blood flow and oxygen supply to the brain. One of the causes of ischemic stroke is abnormalities in lipid profile levels. This study aims to determine the correlation between lipid profiles with the length of stay and clinical outcomes in patients with ischemic stroke. This study is cross-sectional research using secondary data from ischemic stroke patients admitted to Prof. Dr. I Goesti Ngoerah Gde Ngoerah General Hospital between January 1, 2021, and January 31, 2023, who meet the inclusion and exclusion criteria. Out of 215 study subjects included in this research, 137 (63.7%) were male, and 78 were female. Additionally, 192 (89.3%) were aged ? 45 years, and 23 (10.7%) were <45 years. Spearman's analysis showed a weak negative correlation between the length of stay and total cholesterol levels (r = 0.174, p = 0.010), LDL (r = 0.152, p = 0.026), and HDL (r = 0.141, p = 0.039), but no significant correlation was found with triglyceride levels (r = 0.020, p = 0.767). The results of this study also indicated a correlation between clinical outcomes and total cholesterol (p = 0.029) and LDL (p = 0.039), but not with triglyceride levels (p = 0.090) and HDL (p = 0.115). However, further research with a cohort method is needed to establish a direct correlation between lipid profiles with length of stay and clinical outcomes in ischemic stroke patients.
Keywords : Ischemic Stroke, Length of Stay, Outcome