bluuebunny/crossref_metadata_2025_split huggingface dataset:
EVALUASI PROGRAM LABORATORIUM DALAM PEMBELAJARAN IPA DI MADRASAH TSANAWIYAH NEGERI 15 JAKARTA UTARA
Authors: Andris Vrio , Driana Elin , Yuliawati Sri 
Published: June 2023

Laboratorium memiliki peranan penting dalam pembelajaran ilmu pengetahuan alam karena dapat memberi kesempatan pada siswa melakukan aktivitas-aktivitas praktikum untuk memahami dan menerapkan konsep-konsep yang dipelajari. Aktivitas-aktivitas yang dilakukan di laboratorium dapat mendorong siswa berpikir secara kreatif dalam menyelesaikan masalah-masalah terkait sains. Evalusi ini bertujuan untuk menilai program laboratorium IPA Madrasah Tsanawiyah Negeri 15 di Jakarta Utara. Metode evaluasi menggunakan model CIPP. Data dikumpulkan melalui wawancara dengan menggunakan panduan wawancara dan observasi menggunakan checklist, kemudian dianalisis dengan melakukan penskoran. Skor yang diperoleh kemudian diubah ke dalam bentuk persentase dan dikelompokkan ke dalam kategori sangat baik, baik, cukup, kurang dan sangat kurang. Berdasarkan hasil evaluasi dapat disimpulkan bahwa: 1) aspek konteks yang terdiri dari komponen organisasi dan administrasi laboratorium, lokasi dan ruang laboratorium menunjukkan persentase rata-rata 79,41% sehingga termasuk dalam kategori baik; 2) aspek input yang menunjukkan rata-rata persentase 84,18% termasuk dalam kategori sangat baik, antara lain karena peralatan laboratorium yang cukup lengkap dan diklasifikasikan berdasarkan perlengkapan fisika, kimia, dan biologi, 3) aspek proses menunjukkan persentase 64,29% termasuk dalam kategori baik. Penyediaan alat dan bahan pada saat praktikum harus diperbaiki dengan dibantu oleh laboran yang pada saat ini belum dimiliki oleh madrasah, 4) Aspek produk menunjukkan persentase 79,17% sehingga termasuk dalam kategori baik.
PENGARUH METODE PEMBELAJARAN TERHADAP HASIL BELAJAR MATEMATIKA SISWA KELAS VIISMP NEGERI 3 RANGKASBITUNG DITINJAU DARI KEMAMPUAN AWAL SISWA
Authors: Salam Salam , Ernawati  , Abdul Rahman A.  
Published: June 2023

Penelitian ini bertujuan untuk mengetahui pengaruh metode pembelajaran terhadap hasil belajar Matematika siswa kelas VII SMP Negeri 3 Rangkasbitung ditinjau dari kemampuan awal siswa. Populasi target dalam penelitian ini adalah semua siswa SMP Negeri 3 Rangkasbitung Kabupaten Lebak sebanyak 757 siswa dan sampel penelitian sebanyak 80 siswa. Metode penelitian yang digunakan adalah eksperimen rancangan faktorial 2 x 2. Kesimpulan penelitian ini adalah (1) Terdapat pengaruh positif penggunaan metode pembelajaran Contextual Teaching and Learning terhadap hasil belajar Matematika siswa SMP Negeri 3 Rangkasbitung, (2) Terdapat pengaruh positif kemampuan awal siswa terhadap hasil belajar Matematika siswa SMP Negeri 3 Rangkasbitung, (3) Terdapat interaksi antara penggunaan metode pembelajaran Contextual Teaching and Learning dan kemampuan awal siswa terhadap hasil belajar Matematika siswa SMP Negeri 3 Rangkasbitung.

This study aims to determine the effect of learning methods on the results of learning Mathematics for class VII students of SMP Negeri 3 Rangkasbitung in terms of students' initial abilities. The target population in this study were all students of SMP Negeri 3 Rangkasbitung, Lebak Regency, totaling 757 students and the research sample was 80 students. The research method used was a 2 x 2 factorial design experiment. The conclusions of this study were (1) There was a positive effect of the use of the Contextual Teaching and Learning method on the learning outcomes of Mathematics students at SMP Negeri 3 Rangkasbitung, (2) There was a positive influence on students' initial abilities on the results learning Mathematics for students of SMP Negeri 3 Rangkasbitung, (3) There is an interaction between the use of the Contextual Teaching and Learning method and students' initial abilities on the results of learning Mathematics for students of SMP Negeri 3 Rangkasbitung.
Rancang Bangun Sistem Kontrol Untuk Pencampur Nutrisi Hidroponik Metode Pengairan DFT Berbasis Logika Fuzzy
Authors: Zakaria Fikri Dio , Priyandoko Gigih , Mukhsim Mohamad 
Published: June 2023

Abstrak— Hidroponik menjadi salah satu alternatif bagi masyarakat yang ingin berkebun tetapi tidak memiliki lahan yang luas. Hidroponik dengan metode pengairan Deep Flow Technique (DFT) adalah jenis bercocok tanam dimana tanaman ditanam pada air yang dangkal, dan larutan nutrisi terus mengalir di sekitar akar tanaman. Kadar nutrisi yang diperlukan pada setiap jenis tanaman tentunya berbeda beda. Perlunya pemantauan tingkat kepekatan larutan nutrisi secara rutin akan menjadikan masalah bagi masyarakat yang hanya memiliki sedikit waktu luang maka dibuatlah sistem kontrol dengan menggunakan kontrol fuzzy, sistem kontrol yang dirancang pada penelitian ini memiliki kemampuan mengatur nilai atau kadar kepekatan larutan nutrisi teknik hidroponik sistem DFT secara berkelanjutan berdasarkan tingkat penyerapan nutrisi pada tanaman tersebut. Berdasarkan hasil pengujian tingkat keberhasilan 96,875 % untuk nutrisi dan 96.375% untuk air dalam mencapai set point. Pada ketercapaian durasi output memiliki nilai keberhasilan 98,4% untuk output nutrisi dan 98,5% untuk durasi output air dari perbandingan pemodelan di MatLab. Hasil pengujian pada tanaman packcoy, yang menggunakan sistem kontrol pertumbuhanya sedikit lebih baik dari pada packcoy tanpa sistem kontrol, dengan tanaman tertinggi 16 cm dengan menggunakan sistem kontrol sedangkan packcoy tanpa sistem kontrol tertinggi 15 cm
Driven by Fundamentals or Exploded by Sentiments: Testing for Speculative Bubbles in Emerging Stock Markets
Authors: Shaikh Asra , Kashif Muhammad , Rehman Mobeen Ur , Rehman Shafiq Ur 
Published: June 2023

This study investigates the existence of speculative bubbles in diverse nine emerging markets, which may lead to terrible financial disasters. Therefore, a novel approach of Rtadf (Recursive, Right-tailed Augmented Dickey-Fuller) tests, monthly time-series data (January 2000–July 2021), and Monte-Carlo simulation under Gaussian assumptions is used. Our findings imply that massive growth in China, Indonesia, Malaysia, Pakistan, Taiwan, and Thailand is driven by credit or speculative bubbles rather than fundamentals whereas no bubbles are found in South Korea, India, and the Philippines - (as per Generalized Supreme ADF - GSADF test). Furthermore, in each stock market, these bubbles primarily exist prior to any local and global financial crisis. These findings add to the existing knowledge of the relationship between bubbles and financial crises. Hence, this study suggests the GSADF test could detect an impending financial crisis in any economy, allowing authorities to control or maintain economic and financial stability.
Analysis and investigation on defects - delamination and spalling of metal on rolling surface of rail head under code X 10.1
Authors: Ivanovs Viktors , Gavrilovs Pavels 
Published: June 2023

One of the main defects in rail steel is a defect on the rolling surface of the rail head. A sign of the defect appearance is delamination and spalling of the metal on the rolling surface. The development of this type of defect to a length of more than 25 mm and a depth of more than 4 mm requires a decrease of the train speed up to 70 km·h-1, and with a depth of more than 8 mm - to 25 km·h-1. Reducing the speed significantly affects the quality of service and railway performance. As a result, there is a disruption in the accuracy of train traffic, which subsequently leads to material costs for restoring the movement of trains at set speeds. The primary task of the study presented in this article is the collection and analysis of statistical information on the Latvian Railway defective rails in the period from 2011 to 2021. A secondary task is to investigate the causes of the appearance of rail defects under code X 10.1. The research process included: detection of these defects on the Latvian Railway using a modern ultrasonic flaw detector of the “RDM-24” type, determination of the metal hardness (EN 13674-1:2011 standard 350-390 HB) in the rail head and on the rolling surface using a certified modern device “Tinius O Olsen” Firmware Version 1.07, FH - 31 Series as well as the study of the chemical composition of the rail head using the optical emission analyzer PMI - Master PRO and determination of the microstructure of the metal in the rail head. At the final stage, to compare the results obtained in an independent certified laboratory, based on the results of the research to draw conclusions about the causes of this type of defect.
Data correlation of mercury in eggshells and eggshell membranes of wild birds
Authors: Abola Anda , Rimsa Antonija , Strazds Maris , Veilande Rita , Revalde Gita 
Published: June 2023

Wild birds are common study subjects as agents of mercury pollution, in particular predominantly fish-eating birds that are at risk for high mercury intake. The Black Stork is one such species in Latvia. Its conservation status is very unfavourable; by the IUCN criteria, it is considered to be critically endangered. Our data encompasses several species of wild birds; however, the bulk of data consists of black stork eggshells. If the target species is endangered, it is highly desirable to reduce the impact caused by the data collection itself. The collection of eggshell remains under nests is one such non-invasive method. Black storks often drop hatched eggshells and the remains of eggs out of their nests. The downside of this method is the fact that one cannot choose a preferable type of artefact to be collected, only what is there. Eggshell remains under nests vary greatly both in size and condition from almost complete eggs to tiny scratches of eggshell. We used an atomic absorption spectrometer with Zeeman correction LUMEX RA-915M paired with its attachment for pyrolytic analysis PYRO-915+ to detect total mercury concentration in our samples. Pyrolytic combustion enables direct measurements without special pre-treatment steps, minimizing sample contamination risk and offering nearly immediate results. To assess our data, we did a statistical analysis using R version 4.2.1. We have previously observed that eggshell membranes contain higher levels of mercury than eggshells themselves. Here we check whether the amount of mercury found in various types of artefacts correlates, using 320 pairs of data for black storks for which both separate measurements were possible. Our data show that the correlation between the two is significant. In addition, we discuss the correlation between eggshells with attached membranes and membranes themselves, as well as between eggshells and eggshells with attached membranes.
Modelling of fam-gate nitrogen balance in pig production - case study of Latvia
Authors: Auzins Alberts , Jansons Imants 
Published: June 2023

The 150 million pigs reared across EU represent the largest livestock category before that of bovines. In Latvia in 2021 the number of pigs reached 327.0 thousand. The European Green Deal is aimed at transforming EU into an equitable and prosperous society, with a modern, competitive and efficient economy in the use of resources, in which there are no net emissions of greenhouse gases. The EU taxonomy for sustainable activities stipulates that economic activity can qualify as environmentally sustainable only if it substantially contributes to one or more environmental objectives. In case of agriculture, there are limited options how to contribute substantially. One of these options is ensuring sustainable farm-gate nitrogen balance. Moreover, in pig production this option is almost the only real option, especially for landless pig farms. The Platform on Sustainable Finance has proposed several indicators how to measure the farm-gate nitrogen balance, e.g. nitrogen use efficiency (NUE). There is a lack of systematic knowledge about the fam-gate nitrogen balance in Latvia’s pig farming. Therefore, the aim of the study was to model the farm-gate nitrogen balance and examine NUE for both conventional and organic pig production. The input data for modelling were derived from two comparable models of pig production (conventional and organic, 1 000 sows, full production cycle). The criterion of minimum NUE (40%) proposed by the platform was applied to assess the results of the modelling. Results of the study reveal that possibility to meet the minimum NUE of 40% depends on NUE of feed. NUE of feed should be higher than 50% in order to reach the minimum NUE of 40%: at least 58% (conventional production) and 66% (organic production). Thus, ensuring NUE of pig production at least 40% could be challenging for pig farms that purchase feed with unknown NUE or low NUE.
Justification of parameters affecting increase of hammer crusher productivity
Authors: Revenko Ivan , Khmelovskyi Vasyl , Revenko Yulii , Rebenko Victor , Potapova Svitlana 
Published: June 2023

The analysis of the efficiency of the particle sizes of the feed components used in feed rations resulted in proof of the significance of the feed particle size not only while feeding animals with loose dry or wet mixtures but also with feed granules. The study showed that to increase the efficiency of hammer crushers it is relevant to substantiate the parameters of the hammer rotor and the method the raw materials are supplied into the crusher’s working chamber. The experiment involved a stand, which enabled determining the strength of stems while being broken. A sieve classifier was applied to measure the average particle size of the ground products. The rotor speed was monitored electronically and duplicated by a manual tachometer. The average diameter of clover samples was 1.64 mm and correspondingly 3.3 mm of lupine; the length of the samples was 50 and 100 mm. The breaking force on a clover stalk with 13.2% of moisture was 97 N max and 4.4 N min, and correspondingly in the case of a lupine stalk – 22.7 N max and 1.5 N min with 12.3% of moisture. In our case, grinding clover and lupine hay with the minimal energy density Qs, 60 m·s-1 was considered to be the efficient speed of the hammers υм, and the grinding modulus М was within 1.0-1.3 mm. With the different values of the hammer speed and the crusher grinding chamber width of 180 mm, the results of the experimental studies showed that regardless of a supply method and a type of processed raw materials, the output of the ground products was distributed quite unevenly across the width of the working chamber. However, it was found that the peripheral feeding method was significantly more effective than a central one, since the quicker the work was done, the more efficient it became. While at speed υм = 30 m·s-1, the unevenness of the product output under the central supply method was greater than that of the peripheral one only in 8-14%, at speed υм = 75-80 m·s-1 this difference reached 20-32%.
Treatment quality assessment of sunflower inter-row widths with asymmetric joining of cultivator to tractor
Authors: Bulgakov Volodymyr , Ivanovs Semjons , Adamchuk Valerii , Nadykto Volodymyr , Kyurchev Volodymyr , Yaremenko Vadym , Krasiuk Liudmyla 
Published: June 2023

Almost all existing units for mechanical processing of inter-row widths of row crops (corn, sunflower, soybeans, etc.) are symmetrical. In this case, the ratio of the tractor track to the row crop’s inter-row widths is an even integer (k). This article presents the study results of a machine-tractor unit in which the value k equals 3; that is, it is odd. As a result, an asymmetric unit was obtained, in which the cultivator is displaced in the transverse direction relative to the tractor symmetry axis by half the inter-row width, equal to 70 cm. The width fluctuations of sunflower plant protective zone formed by such machine-tractor unit are rather low-frequency. At a speed of 1.9 m·s-1, the main variance spectrum of these oscillations is concentrated in the frequency range 0-0.9 m-1 or 0-0.27 Hz. With an increase in the unit movement speed to 2.4 m·s-1, this diapason narrows to 0-0.6 m-1 (0-0.23 Hz). At the same time, an increase in the movement speed of the studied unit from 1.9 to 2.4 m·s-1 did not lead to a significant change in the mean of the width and variance of the sunflower row protective zone oscillations. The actual difference between the means of this zone (0.6 cm) turned out to be less than LSD05, equal to 0.8 cm. In addition to this, the null hypothesis about the equality of the compared of this parameter fluctuation variances was confirmed. Calculations have established that the possible deviation frequency of the sunflower plant protective zone width actual value of ± 1 cm from the established one can reach 0.007 m-1 or one release per 143 m of the path travelled by the unit at a speed of 1.9 m·s-1. When the machine-tractor unit moves in the sunflower inter-row widths at a speed of 2.4 m·s-1, the value of this indicator is 0.009 m-1 or one release per 111 m of the path. According to the results of experimental studies, real damage (cutting) of sunflower plants for both unit operation modes did not exceed 0.9%. The weed destruction in the inter-row widths of this crop was 98.5%.
Research on gas dynamic flows in poultry house lateral ventilation system using cfd modelling
Authors: Bulgakov Volodymyr , Aboltins Aivars , Trokhaniak Viktor , Beloev Hristo , Trokhaniak Oleksandra , Holovach Ivan , Synyavskiy Oleksandr 
Published: June 2023

Maintaining a good microclimate in the poultry house is one of the most important factors in poultry breeding. It is the quality of the air parameters that ultimately determines the quality of the yield. Poultry keeping requires a lot of effort and technological solutions. Therefore, the study is aimed to improve the microclimate system in the air environment of the poultry house by incorporating exhaust fans on the rear end wall in a non-traditional way. Computational Fluid Dynamics (CFD) with ANSYS Fluent is a powerful tool for predicting the climate system in the poultry house, as an alternative to experimental studies. CFD modelling of the gas-dynamics and heat-mass exchange processes has led to the conclusion that raising the valves to a height of 210 mm from the slab, and changing the spoiler cut-out by 73 °allows air to be conveyed to the centre of the poultry house. At the same time, the pressure drop of the supply valves is 47.18 Pa, which makes it possible to fully supply the exhaust fan. The air velocity at the inlet of the supply valves is 9.16 m·s-1. The average air speed at 0.7 m above the floor level is 0.71 m·s-1, and the temperature is 14.83 °С. Thus, the research presented can be used to develop new ventilation systems for poultry houses in the future.
Outsiders Looking In: Do Contingent Workers Whistleblow?
Authors: Holderness D. Kip , Scheetz Andrea M. , Wall Joseph 
Published: June 2023

ABSTRACT
Little is known about the factors that influence whistleblowing for contingent workers. This study compares the whistleblowing intentions of 146 traditional full-time and contingent workers. We find that contingent workers are significantly less likely to whistleblow than traditional full-time workers. Some of these differences in whistleblowing intentions appear to be due to feelings of powerlessness, organizational citizenship behavior, and organizational commitment that workers have in relation to their organizations. We offer future research ideas, implications for practice, and practical suggestions to encourage whistleblowing by contingent workers.
JEL Classifications: M49.
PERILAKU KEUANGAN GENERASI Z BERDASARKAN LITERASI KEUANGAN, EFIKASI DIRI, DAN GENDER
Authors: Akbar Rama Pradika , Armansyah Rohmad Fuad 
Published: June 2023

Perilaku keuangan menyangkut tanggung jawab seseorang terkait bagaimana cara pengelolaan keuangan guna memiliki kondisi keuangan yang aman dalam hidup. Perilaku keuangan yang baik ditunjang dengan tingkat literasi keuangan serta keyakinan seseorang dalam mengelola keuangan. Perilaku konsumtif yang terjadi pada seseorang terjadi karena kurangnya tanggung jawab seseorang dalam keuangan yang dipicu oleh terbatasnya pemahaman seseorang mengenai perilaku keuangan. Penelitian ini dilakukan untuk menguji pengaruh literasi keuangan, efikasi diri, dan gender terhadap perilaku keuangan Generasi Z. Jumlah responden pada penelitian ini sebanyak 209 responden yang ada di Pulau Jawa, Indonesia dengan rentang usia 18 tahun sampai dengan 27 tahun. Data responden dikumpulkan dengan kuesioner menggunakan teknik purposive sampling dan convenience sampling. Teknik analisis data yang digunakan yaitu Structural Equation Model-Partial Least Square (SEM-PLS) dengan menggunakan progam WarpPLS 7.0. Hasil penelitian menunjukkan bahwa literasi keuangan dan gender tidak berpengaruh signifikan terhadap perilaku keuangan, sedangkan efikasi diri memiliki pengaruh positif signifikan terhadap perilaku keuangan Generasi Z.
Relationship Of Self-Control With Student Academic Procrastination
Authors: Mandasari Desta , Nirwana Herman 
Published: June 2023

This study aims to (1) describe student academic procrastination, (2) describe student self-control, and (3) examine the relationship of self-control with student academic procrastination. This type of research is quantitative research using a descriptive and correlational analysis approach. The population in this study were students of class VII, VIII, and IX SMP N 12 Padang and the amount of samples was 270 students taken using proportional stratified random techniques. This study uses two data analysis techniques, descriptive analysis and correlational analysis. Descriptive analysis is using the percentage formula. While correlational analysis uses the product moment correlation formula and the calculation is assisted by using the SPSS version 20.0 for Windows. The results of the study showed (1) the level of academic procrastination in Padang SMP N 12 students in general was in the high category, (2) the level of self-control of SMP N 12 Padang students was generally in the low category, and (3) there was a significant relationship between self -control with academic procrastination students of SMP N 12 Padang with a correlation coefficient of -0.141 and a significance level of 0.020.
The Effectiveness of Content Mastery Services Using the Approach Self Directed Learning to Increase Student Self Confidence
Authors: Wetnawati Wetnawati , Sukmawati Indah 
Published: June 2023

Self-confidence is an attitude that students need to have in order to develop their potential optimally. But in reality at school students are still afraid to express opinions in front of the class, afraid of being laughed at by friends when expressing opinions in front of the class. Many things can be done to improve student confidence one of them by utilizing guidance and counseling services, namely content mastery services. Thisstudy aims to examine differences in student confidence before and after content mastery services are provided using a self directed learning approach. This research uses quantitative methods. This type of research is a pre-experiment, using the one pretest-posttest design. The subjects of this study were 12 students of SMP Negeri 13 Padang in class VIII of 12 students. Data were analyzed using nonparametric statistical techniques using the Wilcoxon Signed Rank Test. The results of the study noticed that the pretest score was 1480 and posttest 1951. Furthermore for the Asymp hypothesis test. Sig. (2-tailed) students' confidence in the experimental group was 0.002 or the probability under alpha 0.05 (0.002 ≤ 0.05) of these results revealed that Ho was rejected and H1 was accepted. Based on the results of this study, it was concluded that content mastery services using an effective self directed learning approach to increase student confidence.