scholarly journals First UK field application and performance of microcapsule-based self-healing concrete

2019 ◽  
Vol 208 ◽  
pp. 669-685 ◽  
Author(s):  
Abir Al-Tabbaa ◽  
Chrysoula Litina ◽  
Petros Giannaros ◽  
Antonios Kanellopoulos ◽  
Livia Souza
Keyword(s):  
Field Application ◽  
Self Healing ◽  
And Performance

Effect of chain extender on microphase structure and performance of self‐healing polyurethane and poly(urethane‐urea)

2021 ◽  
pp. 51371
Author(s):  
Yulong Wang ◽  
Yaqiong Li ◽  
Maoyong He ◽  
Jingjing Bai ◽  
Bingxiao Liu ◽  
...  
Keyword(s):  
Chain Extender ◽  
Self Healing ◽  
And Performance

scholarly journals Self-Healing Many-Core Architecture: Analysis and Evaluation

VLSI Design ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Arezoo Kamran ◽  
Zainalabedin Navabi
Keyword(s):  
Normal Operation ◽  
External Control ◽  
Self Healing ◽  
Aging Effects ◽  
Analysis And Evaluation ◽  
Promising Solution ◽  
Self Test ◽  
And Performance ◽  
The Many ◽  
Many Core

More pronounced aging effects, more frequent early-life failures, and incomplete testing and verification processes due to time-to-market pressure in new fabrication technologies impose reliability challenges on forthcoming systems. A promising solution to these reliability challenges is self-test and self-reconfiguration with no or limited external control. In this work a scalable self-test mechanism for periodic online testing of many-core processor has been proposed. This test mechanism facilitates autonomous detection and omission of faulty cores and makes graceful degradation of the many-core architecture possible. Several test components are incorporated in the many-core architecture that distribute test stimuli, suspend normal operation of individual processing cores, apply test, and detect faulty cores. Test is performed concurrently with the system normal operation without any noticeable downtime at the application level. Experimental results show that the proposed test architecture is extensively scalable in terms of hardware overhead and performance overhead that makes it applicable to many-cores with more than a thousand processing cores.

scholarly journals Semantic-Aware Security Orchestration in SDN/NFV-Enabled IoT Systems

Sensors ◽  
2020 ◽  
Vol 20 (13) ◽  
pp. 3622 ◽  
Author(s):  
Alejandro Molina Zarca ◽  
Miloud Bagaa ◽  
Jorge Bernal Bernabe ◽  
Tarik Taleb ◽  
Antonio F. Skarmeta
Keyword(s):  
Optimal Allocation ◽  
Added Value ◽  
Virtual Network ◽  
Security Policies ◽  
Network Function Virtualization ◽  
Self Healing ◽  
Network Function ◽  
Semantic Conflict ◽  
And Performance ◽  
Self Protection

IoT systems can be leveraged by Network Function Virtualization (NFV) and Software-Defined Networking (SDN) technologies, thereby strengthening their overall flexibility, security and resilience. In this sense, adaptive and policy-based security frameworks for SDN/NFV-aware IoT systems can provide a remarkable added value for self-protection and self-healing, by orchestrating and enforcing dynamically security policies and associated Virtual Network Functions (VNF) or Virtual network Security Functions (VSF) according to the actual context. However, this security orchestration is subject to multiple possible inconsistencies between the policies to enforce, the already enforced management policies and the evolving status of the managed IoT system. In this regard, this paper presents a semantic-aware, zero-touch and policy-driven security orchestration framework for autonomic and conflict-less security orchestration in SDN/NFV-aware IoT scenarios while ensuring optimal allocation and Service Function Chaining (SFC) of VSF. The framework relies on Semantic technologies and considers the security policies and the evolving IoT system model to dynamically and formally detect any semantic conflict during the orchestration. In addition, our optimized SFC algorithm maximizes the QoS, security aspects and resources usage during VSF allocation. The orchestration security framework has been implemented and validated showing its feasibility and performance to detect the conflicts and optimally enforce the VSFs.

Self-Healing Polymeric Materials

2017 ◽  
Vol 727 ◽  
pp. 482-489 ◽  
Author(s):  
Cui Cui Su ◽  
Jian Sheng Chen
Keyword(s):  
Future Development ◽  
Smart Materials ◽  
Polymeric Materials ◽  
Development Trend ◽  
Self Healing ◽  
New Class ◽  
Advantages And Disadvantages ◽  
System Success ◽  
And Performance ◽  
External Intervention

During the last few years, synthetic self-healing materials have become a new class of emerging smart materials with the ability to repair damage and restore lost or degraded properties or performance using resources inherently available to the system. Success in the design of self-healing materials is important to material safety, product reliability and prolonged lifetime. This article covers fundamental material-independent principles and different self-healing approaches for polymeric materials. Among these approaches, some depend on specific external stimulus to achieve their goal while others regain the physical properties of the pristine material without such external intervention. Both the mechanisms and performance of different methods are discussed and evaluated, along with their advantages and disadvantages. In the end, both the potential application areas and the main challenges are also discussed in this article for a better understanding of future development trend of self-healing polymeric materials.

scholarly journals Field Application of Microbial Self-Healing Cement Slurry in Chunguang 17-14 Well

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1544
Author(s):  
Lixia Li ◽  
Tianle Liu ◽  
Guosheng Jiang ◽  
Changliang Fang ◽  
Jiaxin Sun ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Large Scale ◽  
High Efficiency ◽  
Low Cost ◽  
Field Application ◽  
Oil Wells ◽  
Dairy Wastewater ◽  
Self Healing ◽  
Cement Slurry ◽  
Calcium Carbonate Precipitation

Due to the inappropriate treatment of dairy wastewater, which can easily cause underground water pollution, there is an increasing need for a novel approach to reuse dairy wastewater. The technology of microbially induced calcium carbonate precipitation with environmentally friendly characteristics and high efficiency has been widely used for underground infrastructure remediation. However, there is a lack of in-depth research on the application of this technology under extreme underground environments, such as the borehole of oil wells with high temperature, high pressure, alkaline, and aerobic conditions. In addition, to reduce the cost of this technology when applied on a large scale, we adopted dairy wastewater to cultivate bacteria. Then, we put the bacterial solution into cement slurry in the borehole to improve the cementing quality. In this paper, the rheology properties, mechanical strength, permeability, porosity, and pore distribution of microbial cementing slurry were studied. Moreover, we applied this microbial cement slurry in the Chunguang 17-14 well of China, and the sealing channeling ability of cement sheath on site was evaluated. The results showed that dairy wastewater could serve as an alternative medium to provide nutrients and energy for the growth of bacteria with low cost. Additionally, the microbial cement slurry exhibited a good right-angle thickening performance and high mechanical strength. The field application displayed an anti-gas channeling ability after microbial remediation. The application of dairy wastewater incubated bacteria to cement slurry not only provides an alternative method for the reuse of dairy wastewater but is also conducive to prolonging the lifespan of oil wells.

scholarly journals Development and Performance of Bacterial Self-healing Concrete - A Review

2018 ◽  
Vol 431 ◽  
pp. 062003 ◽  
Author(s):  
Muhd Afiq Hizami Abdullah ◽  
Nurul Ain Harmiza Abdullah ◽  
Mohamad Fahrurrazi Tompang
Keyword(s):  
Self Healing ◽  
And Performance
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