Results 121 to 130 of about 385,673 (291)

Analisis subject matter knowledge calon guru matematika pada topik geometri

JP3M (Jurnal Penelitian Pendidikan dan Pengajaran Matematika), 2016
This study aimed to analyse Subject Matter Knowledge (SMK) of preservice teachers in mathematics teaching on the topic of geometry at Mathematics Department of Siliwangi University.
Eko Yulianto, Dedi Nurjamil
doaj  

Well-Posedness of the Schrödinger–Korteweg–de Vries System with Robin Boundary Conditions on the Half-Line

Axioms
The Schrödinger–Korteweg–de Vries (SKdV) system can describe the nonlinear dynamics of phenomena such as Langmuir and ion acoustic waves, which are highly valuable for studying wave behavior and interactions. The SKdV system has wide-ranging applications
Po-Chun Huang, Bo-Yu Pan
doaj   +1 more source

An assessment of stress and production rate of sucker rod heat pipes in oil well pumping system

Deep Underground Science and Engineering, EarlyView.
The sucker rod pumping system is the preferred oil extraction technique. The concept about equipping the hollow vacuum space in solid sucker rods with heat pipe has been scrutinized in terms of stress and oil production evaluation. Abstract The implementation of the heat pipe concept in sucker rods for oil pumping systems negates the requirement for an
R. S. Anand, Ang Li, Wenbo Huang, Juanwen Chen, Qingshan Ma, Fangming Jiang   +5 more
wiley   +1 more source

Seismic analysis and design of tunnels within fault ground: A review

Deep Underground Science and Engineering, EarlyView.
The research methods of seismic response of tunnels within fault ground, including field investigations, analytical solutions, physical experiments, and numerical simulations, and seismic countermeasures are discussed. The present study examines the shortcomings and limitations of the current research and design, and puts forward proposals for future ...
Xingda Wang, Yujing Jiang, Xuepeng Zhang, Yuyong Jiao, Ningbo Li, Xiao Wang, Bo Li   +6 more
wiley   +1 more source

Universal and Normalized Regeneration of Heterogeneous Spent LiFePO4 via Mechanochemical Delithiation and Flash Relithiation

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
We propose a universal “x → 0 → 1” regeneration route: mechanochemical delithiation converts spent LixFePO4 of any degradation level to FePO4, erasing batch variance; 35‐s flash relithiation yields uniform LiFePO4 with near‐identical capacity, suppressing grain growth and cutting energy andtime by >90% versus furnace sintering, overcoming unpredictable
Yaduo Song, Hao Zhang, Sanqi Guo, Cheng Lin, Junyi Lian, Xin Hu, Jinming Guo, Dinggen Li, Minglei Cao, Zhiqiang Wang, Jinyu Wen, Yunhui Huang, Jia Xie, Yonggang Yao   +13 more
wiley   +1 more source

Design of a Hydroelectronic Solar‐Tracking System for Solar Panels

Energy Science &Engineering, EarlyView.
A prototype of a passive solar‐tracking system utilizing buoyant force based on water level was developed, and its MATLAB/Simulink model was implemented. This study is expected to encourage researchers to design solar‐tracking mechanisms using metals with different thermal expansion coefficients, air, oil, and other fluids. ABSTRACT This study presents
Ufuk Süğürtin, Türker Fedai Çavuş
wiley   +1 more source

The quasi-xgamma frailty model with survival analysis under heterogeneity problem, validation testing, and risk analysis for emergency care data

Scientific Reports
Frailty models are important for survival data because they allow for the possibility of unobserved heterogeneity problem. The problem of heterogeneity can be existed due to a variety of factors, such as genetic predisposition, environmental factors, or ...
Hamami Loubna, Hafida Goual, Fatimah M. Alghamdi, Manahil SidAhmed Mustafa, Getachew Tekle Mekiso, M. Masoom Ali, Abdullah H. Al-Nefaie, Hassan Alsuhabi, Mohamed Ibrahim, Haitham M. Yousof   +9 more
doaj   +1 more source

Nanomaterials and Eco‐Friendly Refrigerants in Vapor Compression System: A Review of Performance and Sustainability

Energy Science &Engineering, EarlyView.
This review highlights how nano oils and eco‐friendly nano refrigerants enhance energy‐efficient refrigeration by improving thermal conductivity, lubrication, and system performance. The integration of rheological and tribological testing confirms reduced compressor work, better heat transfer, and higher COP using sustainable, low‐GWP refrigerants for ...
Mohammed Dilawar, Bisma Ali, Turali Narayana, Mohammad Reza Chalak Qazani, Rehan Khan, Adnan Qayoum, Tabrez Qureshi, Mohd Mujtaba Ahmed   +7 more
wiley   +1 more source

Design and Experimental Study of Pressure Maintenance and Temperature Control System for Hydrate Pressure Core Processing Device

Energy Science &Engineering, EarlyView.
This paper presents a hydrate pressure core processing device integrated with a high‐precision active control system to perform nondestructive transfer, cutting, and analysis. To address the limitations of slow dynamic response and high thermal inertia in traditional passive systems, a differentiated control scheme is implemented.
Liwen Nan, Jiawang Chen, Qiaoling Gao, Yingjie Liu   +3 more
wiley   +1 more source

A Reproducible SEM Surface Imaging Protocol for Monitoring Microstructural Changes During Gas–Rock Interactions

Greenhouse Gases: Science and Technology, EarlyView.
ABSTRACT Reliable characterization of mineralogical and textural changes in rock samples is essential for understanding fluid–rock interactions, particularly in experimental studies simulating subsurface conditions. This study presents a reproducible protocol for scanning electron microscopy (SEM) analysis of rock surfaces before and after exposure to ...
Berta Ordóñez‐Casado, Timea Kovács, Sara Roces, Edgar Berrezueta   +3 more
wiley   +1 more source