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Impact of using virtual and concrete manipulatives on students’ learning of fractions

Nabil Kamal Al Farra, Shashidhar Belbase, Hassan Tairab, Ahmad Qablan et al. • Cogent Education (2024)

Fraction is considered one of the main topics in mathematics in the early years. Many students struggle to progress in fractions in the classrooms and on exams. Teaching strategies are among the most important factors affecting student lear...

DOAJ Open Access (DOAJ) DOI: 10.1080/2331186X.2024.2379712

The Threefold Role of the University in Fostering the Energy Transition: The Case of Bologna and Its Cesena Campus

Andrea Boeri, Beatrice Turillazzi, Francesca Sabatini, Louise-Nour Sassenou et al. • Energies (2024)

As acceleration toward the transition to a carbon-neutral energy production becomes an urgent imperative, universities are called to play a multifaceted role: to produce knowledge and cutting-edge research for the pursuit of energy transiti...

DOAJ Open Access (DOAJ) DOI: 10.3390/en17153751

Foraminifera as environmental bioindicators on the Rio Grande Terrace: a preliminary assessment

João Machado Neto, Simone Souza Moraes, Edgar Romeo Herrera de Figueiredo Iza, Felipe Rocha Abreu et al. • Journal of the Geological Survey of Brazil (2025)

There is still a significant gap in research that integrates foraminiferal data with water mass characterization within the specific context of marine phosphorite prospecting. Therefore, this study investigates the environmental dynamics of...

DOAJ Open Access (DOAJ) DOI: 10.29396/jgsb.2026.v9.n2.6

Mixed Systems of Quaternary Ammonium Foam Drainage Agent with Carbon Quantum Dots and Silica Nanoparticles for Improved Gas Field Performance

Yongqiang Sun, Yongping Zhang, Anqi Wei, Xin Shan et al. • Nanomaterials (2024)

Foam drainage agents enhance gas production by removing wellbore liquids. However, due to the ultra-high salinity environments of the Hechuan gas field (salinity up to 32.5 × 104 mg/L), no foam drainage agent is suitable for this gas field....

DOAJ Open Access (DOAJ) DOI: 10.3390/nano14191590

Improved InSAR Deformation Time Series with Multi-Stable Points Technique for Atmospheric Correction

Baohang Wang, Guangrong Li, Chaoying Zhao, Liye Yang et al. • Geosciences (2026)

Potential tropospheric noise is a critical factor that undermines the effectiveness of deformation monitoring in Synthetic Aperture Radar Interferometry (InSAR) technologies. In most scenarios, many point targets within the InSAR deformatio...

DOAJ Open Access (DOAJ) DOI: 10.3390/geosciences16020059

The Effectiveness of Low-Carb Diet vs Low-Fat Diet on Body Composition in People with Obesity: A Literature Review

Tutut Rizki Indriyani, Atika Rahmawati, Luthfiani Khoirunnisa, Izka Sofiyya Wahyurin • Amerta Nutrition (2024)

Background: Obesity is still become a serious problem today. Obesity is caused by excessive adipose tissue. One of many factors that contribute to a person's obesity is food intake. Excess carbohydrate and fat intake will be stored in the f...

DOAJ Open Access (DOAJ) DOI: 10.20473/amnt.v8i1.2024.139-150

Linear Potentiometer Sensor-Based of Athlete Flexibility Measurement Tool

Dzihan Khilmi Ayu Firdausi, Muhammad Eka Mardyansyah Simbolon, Indra Dwisaputra, Catur Pebriandani • Jurnal Teknik Elektro Indonesia (2024)

This study aims to develop a novel "sit and reach test" flexometer device utilizing a linear potentiometer sensor to quantitatively evaluate an individual's body flexibility. The innovation in this research lies in the utilization of electr...

DOAJ Open Access (DOAJ) DOI: 10.24036/jtein.v5i1.541

Remaining Useful Life Prediction for Nonlinear Degraded Equipment With Bivariate Time Scales

Hong Pei, Changhua Hu, Xiaosheng Si, Jianfei Zheng et al. • IEEE Access (2019)

As the fundamental and prerequisite work of remaining useful life (RUL) prediction, degradation modeling directly affects the accuracy of RUL prediction. Existing degradation models are all developed under a single time scale, and less rese...

DOAJ Open Access (DOAJ) DOI: 10.1109/ACCESS.2019.2951804

A Novel Dual-Domain Filtering Method to Improve GNSS Performance Based on a Dynamic Model Constructed by TDCP

Fangchao Li, Jingxiang Gao, Nanshan Zheng, Cheng Pan et al. • IEEE Access (2020)

To overcome the strikes from the tremendous noise of pseudorange and the integer ambiguity of carrier phase observation, we developed a novel dual-domain filtering method that integrates the traditional observation- and an innovative positi...

DOAJ Open Access (DOAJ) DOI: 10.1109/ACCESS.2020.2990132

Delay-Dependent H∞ Control for Singular Markovian Jump Systems With Generally Uncertain Transition Rates

Chunyu Li, Lin Li, Anyou Shen • IEEE Access (2020)

This article is devoted to the problem of H control for a class of singular Markovian jump systems with time-varying delay and generally uncertain transition rates, which means each transition rate is completely unknown or only its estimate...

DOAJ Open Access (DOAJ) DOI: 10.1109/ACCESS.2020.3040974

Optimal planning of integrated energy system considering swapping station and carbon capture power system

Chenke He, Jizhong Zhu, Kwok Cheung, Alberto Borghetti et al. • Energy Reports (2023)

An optimal planning method for an integrated energy system (IES) considering electric vehicles (EVs) swapping station (SS) and carbon capture power system (CCPS) is studied in this paper. Firstly, based on the analysis of swapping EV load, ...

DOAJ Open Access (DOAJ) DOI: 10.1016/j.egyr.2023.09.120

Feature Selection and Rule Generation Integrated Learning for Takagi-Sugeno-Kang Fuzzy System and its Application in Medical Data Classification

Xiaoqing Gu, Cong Zhang, Tongguang Ni • IEEE Access (2019)

The rule-based fuzzy systems have successfully applied for numerous medical data classification problems. However, structuring the concise and interpretable fuzzy rules with good classification performance is still a big challenge. To addre...

DOAJ Open Access (DOAJ) DOI: 10.1109/ACCESS.2019.2954707

Spectrum sensing and resource allocation for 5G heterogeneous cloud radio access networks

Hossein Safi, Ali Mohammad Montazeri, Javane Rostampoor, Saeedeh Parsaeefard • IET Communications (2022)

Abstract In this paper, the problem of opportunistic spectrum sharing for the next generation of wireless systems empowered by the cloud radio access network (C‐RAN) is studied. More precisely, low‐priority users employ cooperative spectrum...

DOAJ Open Access (DOAJ) DOI: 10.1049/cmu2.12356