bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Ultrasonic Treatment on Residual Stress and Mechanical Properties of AISI 304 Stainless Steel Welding
Authors: Li Wenkai , Zou Guowei , Yin Peng , Xu Chunguang , Zhang Wenjun , Xu Rui , Zhu Congbin 
Published: August 2024

Abstract
AISI 304 stainless steel has low thermal conductivity and a high linear expansion coefficient; conventional welding with this material produces coarse grains and poor joint tensile properties. To address the problems inherent in conventional 304 stainless steel welding, an ultrasonic transducer was brought into contact with a base metal and treated with ultrasonic vibration during welding. The residual stress distribution, microstructure, and mechanical properties of the welded joint were then analyzed. The results showed that under the combined action of thermodynamics and the dynamics caused by ultrasonic treatment, the flow performance of the molten pool was enhanced, heat was transferred from the high-temperature region to the low-temperature region, and the metal elements were constantly diffused during the crystallization of the molten pool. Thus, the transformation rate of columnar crystals to equiaxed crystals was accelerated, the proportion of equiaxed crystals increased, and the grains became refined. Compared with conventional welding, the microstructure of the 304 stainless steel welded joints was better after the introduction of ultrasonic vibration, and its tensile residual stress was significantly lower. The improvement in the microstructure of the weld improved its mechanical properties, and the hardness of the weld zone increased significantly, which was close to that of the base metal. After the ultrasonic treatment, the increase in the equiaxed crystals and the refinement in the grains effectively improved the quality of the welded joints so that the tensile strength of the welded joints was higher than that of conventional welded joints. Under the condition of the same ultrasonic vibration frequency and power, the tensile strength of welded joints with 2-mm steel plate exhibited a notable increase, which was 13 %.
Assessing the Suitability of Different Testing and Specimen Preparation Approaches for Indirect Tensile Cracking Test (IDT-CT) Using a Simple Ranking Framework
Authors: Kumar Vikas , Coleri Erdem , Sukhija Mayank 
Published: August 2024

Abstract
The advent of new additives such as polymers, rubber, and warm mix additives, as well as emphasis on the use of reclaimed asphalt materials, has rendered the traditional volumetric mix design of asphalt mixtures inadequate. As a result, the need for incorporating performance tests in the mix design process and adopting a balanced mix design (BMD) approach is now being widely recognized. One of the major challenges in adopting and implementing the BMD process is the selection of performance tests for rutting and cracking evaluation. Oregon is in the preimplementation phase of BMD. The Oregon Department of Transportation has been working on the development of a BMD method since 2015 and is now exploring the use of the indirect tensile cracking test (IDT-CT) (formerly called the IDEAL-CT), which is a simple, practical, and rapid cracking performance test. However, the results of this test have been found to be sensitive to the loading equipment, aging conditions, temperature conditioning methods, and specimen's air voids, among other factors. In this study, the IDT-CT results of the two mix types were compared for different aging conditions, temperature conditioning methods, sample sitting time (the time that lapsed between the production of the sample and the cracking test), and device type, and the most suitable testing approach was determined using a simple ranking approach. Among all the testing approaches, testing the samples in a low-cost load frame after conditioning them in a dry conditioning chamber can be considered the most suitable method.
Evolution of the Shear Strength and Microstructure of Undisturbed Lateritic Soil under the Influence of Alkali Contamination
Authors: Yue Xiu , Bai Wei , Kong Ling-wei , Guo Ai-guo 
Published: August 2024

Abstract
With the progression of industrialization, alkaline contamination has become an increasingly serious issue in soil environments, significantly impacting the engineering properties and microstructure of soils. Undisturbed lateritic soil samples were immersed in sodium hydroxide solutions with pH values of 8.8 and 11.4, as well as in deionized water with a pH of 7.0, for soaking times of 1 day, 7 days, and 28 days. The influence of alkali contamination on the shear strength of the lateritic soil was quantified through consolidated slow shear tests. Additionally, scanning electron microscopy, thermogravimetric analysis, nitrogen adsorption tests, mercury intrusion porosimetry, and laser particle size analysis were employed to thoroughly explore changes in micromorphology, mineral composition, pore structure, and particle size of samples, aiming to establish a microstructural evolution model. At pH = 8.8, the cohesion and friction angle of samples are higher than that soaked in water and increase with the soaking time. At pH = 11.4, the cohesion significantly increases on the 1st day, relatively decreases by the 7th day, but remains higher than that at pH = 8.8. Subsequently, with an increase in soaking time, the cohesion continues to rise. The alkali solution dissolves the kaolinite minerals causing the pore structure to collapse. The elevated shear strength at pH = 8.8 is attributed to smaller particles tightly locking together to form a more stable structure. At pH 11.4, the significant increase in cohesion after 1 day is not only attributable to the reasons mentioned above but also attributed to the aluminum silicate gel’s bonding effect on particles. By the 7th day, gel dissolution reduces soil cohesion.
Damage Assessment of 3-D Printed Ceramic Sandwich Structures with an Auxetic Honeycomb Core Subjected to Quasistatic Indentation Loading
Authors: Liu Qiang , Guan Guoyang , Liao Baopeng , Zhao Zhe , Chen Laiming , Yu Jian 
Published: August 2024

Abstract
Ceramic sandwich structures (CSS) have become an important material in the aerospace industry because of their high strength and excellent thermal insulation properties. However, the brittle nature of ceramic makes them vulnerable to damage from foreign objects, which can reduce their load-bearing capacity. In this paper, a series of tests were designed to investigate the response of CSS to impacts from foreign objects. To realize the damage characteristics and failure modes under the indentation force, a quasistatic indentation (QSI) test was conducted on CSS. Additionally, an acoustic emission device was used to capture damage signals during the QSI testing. Thereafter the extent of damage was evaluated by analyzing the damaged area and the compression after indentation properties. The results of these tests revealed the failure mechanism maps and indicated that the compressive strength of the damaged CSS had a stronger correlation with damage to the honeycomb core than to the face sheet.
Interpreting and Managing Laboratory Data below the Quantification and Detection Threshold
Authors: Carson Polona K. 
Published: August 2024

Abstract
One of the problems of interpreting laboratory reports with data below reporting and detection limits is that there is no standard for reporting. Therefore, laboratories are using different nomenclature, definitions, and reporting formats for low-level data. Some knowledge of laboratory processes is often needed to find all the information required to accurately interpret laboratory reports. To make correct conclusions based on the statistical analysis of such data, a collaboration between a data analyst and a chemist to review the narrative explaining the data package and accurately interpret detection and reporting limits and data qualifiers is needed. This paper is written to aid data analysts and laboratory operational and quality managers in recognizing issues with reporting low-level data and to avoid common pitfalls in their interpretation.
KEMAMPUAN BERPIKIR KREATIF DAN SELF-EFFICACY SISWA KELAS X SMK TEUKU UMAR SEMARANG DENGAN MODEL PEMBELAJARAN OSBORN
Authors: Aziz Muhammad Abdul , Rochmad Rochmad , Wijayanti Kristina 
Published: August 2024

Tujuan penelitian ini untuk mengetahui apakah kemampuan berpikir kreatif siswa kelas eksperimen lebih baik daripada kemampuan berpikir kreatif siswa kelas kontrol, untuk mengetahui apakah kemampuan berpikir kreatif siswa kelas eksperimen meningkat, untuk mengetahui apakah peningkatan kemampuan berpikir kreatif siswa kelas eksperimen lebih baik daripada peningkatan kemampuan berpikir kreatif siswa kelas kontrol, dan untuk mengetahui bagaimana self-efficacy siswa pilihan kelas eksperimen dan siswa pilihan kelas kontrol. Populasi dalam penelitian ini adalah siswa kelas X kelompok bisnis dan manajemen SMK Teuku Umar Semarang tahun pelajaran 2014/2015. Sampel diambil dengan teknik simple random sampling. Pengambilan data pada penelitian ini menggunakan metode tes, angket, dan wawancara. Analisis data menggunakan uji-t, uji gain, dan analisis kualitatif deskriptif. Dari hasil uji-t diperoleh rata-rata kemampuan berpikir kreatif siswa kelas eksperimenÂ lebih dari rata-rata kemampuan berpikir kreatif siswa kelas kontrol, dan peningkatan kemampuan berpikir kreatif siswa kelas eksperimen lebih baik daripada peningkatan kemampuan berpikir kreatif siswa kelas kontrol. Dari hasil uji gain diperoleh kemampuan berpikir kreatif siswa pada kelas yang menggunakan pembelajaran Osborn meningkat dengan indeks gain sebesar 0,400, termasuk dalam kategori sedang. Self-efficacy ketiga siswa pilihan pada kelas eksperimen yaitu E-1, E-2, dan E-3 dalam kategori tinggi, sedangkan self-efficacy ketiga siswa pilihan pada kelas kontrol yaitu K-1, K-2, dan K-3 dalam kategori sedang.
KOMPARASI PEMBELAJARAN MEA DAN PBL TERHADAP KEMAMPUAN PEMECAHAN MASALAH DAN DISPOSISI MATEMATIS SISWA SMP KELAS VIII PADA MATERI SPLDV
Authors: Miranti Nawang Kusuma , Agoestanto Arief , Kurniasih Ary Woro 
Published: August 2024

Tujuan penelitian ini adalah untuk mengetahui: (1) apakah kemampuan pemecahan masalah dan disposisi matematis pada pembelajaran MEA lebih baik dariÂ kemampuan pemecahan masalah dan disposisi matematis siswa pada pembelajaran PBL, dan (2) apakah terdapat perbedaan kemampuan pemecahan masalah siswa yang mempunyai disposisi matematis rendah, sedang dan tinggi. Populasi dalam penelitian ini adalah siswa kelas VIII SMP N 1 Donorojo. Melalui teknik Random Sampling terpilih kelas eksperimen dan kelas kontrol. Metode analisis data menggunakan uji kesamaan dua rata-rata, uji ANAVA, dan uji lanjut Tukey-Kramer. Hasil penelitian menunjukkan bahwa kemampuan pemecahan masalah dan disposisi matematis siswa pada pembelajaran MEA lebih baik dari pembelajaran PBL. Kemudian terdapat perbedaan kemampuan pemecahan masalah siswa yang mempunyai disposisi matematis rendah, sedang, dan tinggi. Hasil uji lanjut menyatakan bahwa tidak ada perbedaan kemampuan pemecahan masalah antara siswa dengan disposisi matematis sedang dan tinggi. Selanjutnya dapat dilakukan penelitian lebih lanjut terkait penyebab tidak ada perbedaan kemampuan pemecahan masalah antara siswa dengan disposisi matematis sedang dan tinggi.
PENERAPAN MODEL PEMBELAJARAN CTL DENGAN STRATEGI REACT UNTUK MENINGKATKAN HASIL BELAJAR DAN KEDISIPLINAN SISWA PADA MATERI GEOMETRI
Authors: Wangi Sulistyaningsih Ratu , Winarti Endang Retno , Kharis Muhammad 
Published: August 2024

TujuanÂ penelitianÂ iniÂ adalahÂ untukÂ meningkatkanÂ hasilÂ belajarÂ danÂ kedisiplinanÂ siswa.Â PopulasiÂ penelitianÂ iniÂ adalahÂ siswaÂ kelasÂ VIIIÂ SMPN1Â AmpelgadingÂ tahunÂ pelajaranÂ 2014/2015.Â DuaÂ kelompokÂ dipilihÂ secaraÂ acakÂ sebagaiÂ kelompokÂ eksperimenÂ danÂ kelompokÂ kontrol.Â TeknikÂ pengumpulanÂ dataÂ yangÂ digunakanÂ yaituÂ metodeÂ tesÂ hasilÂ belajar,Â metodeÂ observasiÂ kedisiplinan,Â danÂ kuesionerÂ kedisiplinan.Â DataÂ dianalisisÂ denganÂ ujiÂ proporsi,Â ujiÂ kesamaanÂ duaÂ rata-rata,Â ujiÂ kesamaanÂ duaÂ proporsi,Â danÂ ujiÂ Gain.Â HasilÂ penelitianÂ yangÂ diperolehÂ menunjukkanÂ bahwaÂ hasilÂ belajarÂ siswaÂ padaÂ kelompokÂ yangÂ menggunakanÂ modelÂ pembelajaranÂ CTLÂ denganÂ strategiÂ REACTÂ dapatÂ mencapaiÂ ketuntasanÂ belajar,Â rata-rataÂ hasilÂ belajarÂ siswaÂ padaÂ kelompokÂ yangÂ menggunakanÂ modelÂ pembelajaranÂ CTLÂ denganÂ strategiÂ REACTÂ lebihÂ dariÂ rata-rataÂ hasilÂ belajarÂ siswaÂ padaÂ kelompokÂ yangÂ menggunakanÂ modelÂ pembelajaranÂ DI,Â proporsiÂ ketuntasanÂ hasilÂ belajarÂ siswaÂ padaÂ kelompokÂ yangÂ menggunakanÂ modelÂ pembelajaranÂ CTLÂ denganÂ strategiÂ REACTÂ lebihÂ dariÂ proporsiÂ ketuntasanÂ hasilÂ belajarÂ siswaÂ padaÂ kelompokÂ yangÂ menggunakanÂ modelÂ pembelajaranÂ DI,Â kedisiplinanÂ siswaÂ padaÂ kelompokÂ yangÂ menggunakanÂ modelÂ pembelajaranÂ CTLÂ denganÂ strategiÂ REACTÂ lebihÂ baikÂ dariÂ kedisiplinanÂ siswaÂ padaÂ kelompokÂ yangÂ menggunakanÂ modelÂ pembelajaranÂ DI,Â penerapanÂ modelÂ pembelajaranÂ CTLÂ denganÂ strategiÂ REACTÂ dapatÂ meningkatkanÂ hasilÂ belajarÂ danÂ kedisiplinanÂ siswa.Â Jadi,Â disimpulkanÂ bahwaÂ penerapanÂ modelÂ pembelajaranÂ CTLÂ denganÂ strategiÂ REACTÂ dapatÂ meningkatkanÂ hasilÂ belajarÂ danÂ kedisiplinanÂ siswa
Remedial Teaching untuk Mengatasi Kesulitan Belajar Siswa pada Kemampuan Pemecahan Masalah Matematika berdasarkan Prosedur Newman
Authors: Hafid Hasan , Kartono Kartono , Suhito Suhito 
Published: August 2024

Penelitian ini dilatarbelakangi oleh temuan kesulitan belajar siswa dalam belajar matematika. Tujuan penelitian ini adalah untuk mendiagnosis kesulitan belajar siswa dalam kemampuan pemecahan masalah berdasarkan prosedur Newman dan melaksanakan remedial teaching untuk mengatasi kesulitan belajar siswa. Pembelajaran kooperatif tipe Think Pair Share diajarkan kepada siswa untuk memberikan kemampuan pemecahan masalah. Subjek penelitian adalah sembilan siswa kelas X Mipa 1 di SMA Negeri 1 Petarukan yang diambil 3 siswa pada kelompok atas, tengah, dan bawah. Hasil penelitian ini adalah: 1) kebanyakan letak kesulitan belajar siswa adalah pada tahap memahami (comprehension) dan tranformasi. Untuk kesalahan process skill dan encoding terjadi karena siswa mengalami kesalahan pada tahap sebelumnya. Temuan faktor penyebab kesulitan belajar siswa yaitu 3 siswa mengalami kesulitan belajar bersifat fisiologis, 5 siswa bersifat psikologis, 1 siswa bersifat pedagogis, 6 siswa bersifat sosiologis; 2) remedial teaching berhasil mengatasi kesulitan belajar sebanyak 8 dari 9 siswa atau 89% siswa. Sehingga dapat dikatakan remedial teaching efektif dalam mengatasi kesulitan belajar.
This research was motivated by findings of students' learning difficulties in learning mathematics. The purpose of this research was to diagnose students' learning difficulties in problem solving skill based Newman procedures and implement remedial teaching for eclipse students learning difficulties. Cooperative learning Think Pair Share was taught to students to give problemÂ­solving skills. The subjects were nine students class of X science 1 at SHS 1 Petarukan taken three students in the top group, middle, and bottom. The results of this research are: 1) the most mistake of student learning difficulty was at the stage of understanding (comprehension) and transformation. For process skill and encoding errors occur because students had an error in the previous stage. The factors causing of students' learning difficulties were three students had learning difficulties were physiological, 5 students were psychological, one student was pedagogical, 6 students were sociological; 2) remedial teaching successfully eclipse learning difficulties 8 of 9 students or 89% of students. So it can be said that remedial teaching effective to eclipse learning difficulties.
Problem solving skill through think pair share model with murder approach viewed from learning interest of tenth grade students
Authors: Millah Najichatul , Waluya St. Budi , Walid Walid 
Published: August 2024

This research focuses on problem-solving capability through Think Pair Share model with MURDER approach viewed from learning interest of the students. TPS learning with MURDER approach was conducted through three phases of TPS namely Think, Pair, and Share. This research aims to testthe completeness of problem-solving through TPS model with MURDER approachand to describe the problem-solving capability through TPS model with MURDER approach viewed from studentsâ€™ learning interest.This research usedmixed methods with concurrent embedded design. The samples of this research weretenth-grade students of AP (experimental class) andtenth grade TP A (control class) of State Vocational High School 2 Rembang who were chosen through random sampling technique. The quantitative data collection technique used test, while qualitative data collection used triangulation technique. Sample selection on qualitative research used purposive sampling technique. The qualitative datawere analyzed by usingnormality, homogeneity, equality of two means, t, and z tests. Qualitative data were analyzed by using data validation test, data reduction, data presentation, and verification andconclusion drawing. The results of the research showedthat the (1) problem-solving capabilities of the students through TPS model with MURDER approach has reached individual and classical completeness, (2) the problem solving capabilities of the students through TPS model with MURDER approach was better than the problem solving capabilities of the studentsthrough expository learning model, (3) students with high learning interestcould fulfill all problem solving capability indicators, (4) students with moderate learning interestcould fulfill fourproblem solving capability indicatorsbut they tend to be lessthorough, and (5) students with low learning interestwere less able to fulfill appropriate strategies application indicators to solve the problem.
Enhancing mathematical problem solving ability through model eliciting activities
Authors: Diyastanti Arum , Dewi Nuriana Rachmani , Sunarmi Sunarmi 
Published: August 2024

The main purpose of this research was to comprehensively examine the achievement and improvement of mathematical problem solving ability through the use of Model Eliciting Activities and Problem Based Learning. The research method used was explanatory sequential mixed methods. The research design used was Pretest-Posttest Control Group Design. The research population was grade VII students one of Junior High School in Kudus except students in the favourite class. The sample was taken by simple random sampling technique, so that grade VII F was obtained as experiment class and grade VII E as control class. Qualitative research subject were taken 6 subjects based on the mathematical early ability category. The result of the research showed that (1) the achievement of mathematical problem solving ability of the students who got Model Eliciting Activities had not reach the completeness classically; (2) the achievement and improvement of mathematical problem solving ability of the students who got Model Eliciting Activities were better than the students who got Problem Based Learning; (3) the students who got Model Eliciting Activities tend to be active and brave rather than the students who got Problem Based Learning; and (4) some of the studentsâ€™ difficulties, students with the high early mathematical ability in the experiment class did not face any difficulties, only the students were not careful in calculating, while in the control class faced the difficulty in making plans at number 4, thus influencing the next indicator. For students with the medium early mathematical ability in the experiment class faced the difficulty in determining the correctness of the answer and were not careful in calculating, while in the control class faced the difficulty in determining the correctness of the answer and making the plan at number 4 thus influencing the next indicator. Lastly, for students with low early mathematical ability in both experiment class and control class, they faced the difficulty in determining the truth of the answer and had not finished working on the four questions because the time provided has been exhausted.
An analysis of mathematical problem solving ability based on hard work character in mathematics learning using connecting organizing reflecting extending model
Authors: Purwati Lina , Rochmad Rochmad , Wuryanto Wuryanto 
Published: August 2024

Mathematical problem-solving ability is one of the goals of mathematics learning. However, the mathematical problem-solving ability of students is still lacking. Therefore, this research was conducted (1) to observe whether students problem-solving ability on CORE-modeled mathematical learning passed the minimum criteria of mastery learning or called as KKM included average mastery and proportion mastery, (2) compare the application of CORE model and Jigsaw model on students problem solving ability, (3) increase the mathematical problems solving ability using CORE model and (4) analyze the mathematical problem solving ability observed from hard work character using CORE model. This research used a mixed method with the concurrent triangulation method. The population was VIII grade student of SMPN 12 Semarang. The results showed that: (1) the mathematical problems solving ability on CORE-modeled mathematical learning passed the minimum criteria of mastery learning included average mastery and proportion mastery, (2) students problem solving ability on CORE mathematics learning model and those on Jigsaw mathematics learning model are equal, (3) there was an increase in the mathematical problems solving ability on mathematics learning after CORE model being applied, (4) student who had worked hard trait in the 1st group on mathematics learning showed the ability to solve mathematical problems was better than those in 2nd and 3rd group on mathematics learning.
Redreaming Boundaries and Community Engagement: John Edgar Wideman and the Homewood Reading Series
Authors: Osai Esohe , Kubis Dan 
Published: August 2024

John Edgar Wideman is one of Pittsburgh’s most decorated, yet least celebrated native sons. Though Wideman left the city in his youth, he returned as part of a series of events to honor the fiftieth anniversary of his first book. Wideman embodies the unique intersections and tensions that exist in Pittsburgh related to race, place, and the stories we tell. His presence as part of a collaborative reading series reflected those dynamics, bringing together the members of two Pittsburgh neighborhoods: Homewood, a Black neighborhood where Wideman was raised, and Oakland, which is home to the University of Pittsburgh (Pitt). The project created an opportunity for conversation between Black high school students from Westinghouse Academy in Homewood and mostly non-Black university students from Pitt. It also created a cross-disciplinary dialogue between community-engaged scholars at the university. This article draws on student writing and other resources to narrate the limited but meaningful connections between the intersecting spaces that came together in honor of this literary giant. It also situates the project within public humanities scholarship and a community engagement framework, related to the potential role of urban universities in neighboring communities. Finally, it argues that the project has resonance for these uncertain times, as it embodied the themes of Brothers and Keepers, a literary work that explores the tensions that exist in crossing boundaries and how the stories we tell provide meaning, despite differences.