Results 141 to 150 of about 591,240 (354)

Wireless Sensor Networks:A case study for Energy Efficient Environmental Monitoring

open access: yes, 2008
Energy efficiency is a key issue for wireless sensor networks, since sensors nodes can often be powered by non-renewable batteries. In this paper, we examine four MAC protocols in terms of energy consumption, throughput and energy efficiency.
Harris, Nick R.   +3 more
core  

Photovoltaic Power Without Batteries for Continuous Cathodic Protection [PDF]

open access: yes, 1993
The objective of this project was to successfully demonstrate that renewable energy can efficiently and economically replace dedicated non-renewable power sources. The COASTSYSTA designed, installed, and started up on 20 Jan.
Muehl, W. W., Sr.
core   +1 more source

Tough, Ductile, and Strong Hard‐Soft Cementitious Composite Enabled by Multi‐Material Additive Manufacturing

open access: yesAdvanced Materials, EarlyView.
Drawing inspiration from the layered hard‐soft architecture found in sea sponges, this work establishes a new framework for architected cementitious composites (ACC) through multi‐material additive manufacturing (MMAM) process. The integration of mortar and elastomer phases into layered architectures enables synergistic toughening mechanisms, including
Aimane Najmeddine   +5 more
wiley   +1 more source

The Future of Energy: Exploring Renewable and Non-Renewable Resources

open access: yesInternational Journal of Science Education and Science
This comprehensive article delves into the evolving energy landscape, contrasting renewable and non-renewable resources to highlight the global transition toward sustainable energy systems. It underscores the pivotal role of renewable energy sources, such as solar, wind, hydroelectric, and geothermal, as viable solutions to combat climate change and ...
Rashed Ahmed, Md. Tanzimur Rahman Tamim
openaire   +1 more source

Ammonium Salts as Curing Agents to Obtain Ionic Epoxy Resins With a Thermoplastic‐to‐Thermoset Transition

open access: yesAdvanced Materials, EarlyView.
Ionic epoxy networks are prepared using ammonium salts as hardeners, leading to a two‐stage curing process with a thermoplastic‐like intermediate. This uncommon behavior enables extrusion and fabrication of thermoplastic prepregs that can be cured into thermoset composites.
Izabela Kurowska   +10 more
wiley   +1 more source

High Charge Carrier Mobility in Non‐Conjugated 3D Covalent Organic Frameworks

open access: yesAdvanced Materials, EarlyView.
A non‐conjugated 3D COF constructed via boronate ester linkages from tetraphenylene and pyrene‐based monomers is reported, which exhibits a high charge carrier mobility of 14 ± 1 cm2 V−1 s−1. ABSTRACT π‐Conjugation, π–π stacking, and long‐range order play a central role in determining charge transport efficiency in organic materials.
Joaquín Almarza   +11 more
wiley   +1 more source

Energi Terbarukan Dalam Pembangunan Berkelanjutan [PDF]

open access: yes, 2007
Renewable energy is non fossil energy which can be renewed and managed properly. Therefore, the renewable energy resources would be sustainable. Those that can be classified as renewable energy are geothermal, hydro, solar, wind, biomass, ocean, fuel ...
Lubis, A. (Abubakar)
core  

Single‐Chromophore Homojunction Organic Solar Cells: A Path to Simplicity and Efficiency

open access: yesAdvanced Materials, EarlyView.
This perspective discusses how the intrinsic optoelectronic properties of organic semiconductors, their molecular packing in the solid‐state, and internal energetic gradients within a device can enable free‐charge carrier generation in homojunction organic solar cells.
Shaun McAnally   +2 more
wiley   +1 more source

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