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Articles by Peter Dahl
A biofilm-derived peptide as an underwater adhesive
Reference #1 Abstract INTRODUCTION RESULTS DISCUSSION MATERIALS AND METHODS Acknowledgments Supplementary Materials REFERENCES eLetters (0) Information & Authors Metrics & Citations View Options References Figures Tables Media Share This article has 0 eLetter . Abstract Wet adhesives that perform under water have broad applications in industrial and biomedical settings. To date, molecular designs for underwater adhesives have largely been inspired by marine animals including mussels and barnacles.
Potential and kinetic energy of underwater noise measured below a passing ship and response to sub-bottom layering
When a vessel passes directly above, underwater noise emissions originating from the vessel can dominate the sound field below. In such conditions where sound propagation is nearly vertical, the sound field is reinforced by multiple reflections from the seafloor and sea surface, establishing a standing wave. Potential energy can be an order of magnitude greater than kinetic energy in certain frequency bands with the opposite occurring in neighboring bands.
Trends in low-frequency underwater noise off the Oregon coast and impacts of COVID-19 pandemica)
Approximately six years of underwater noise data recorded from the Regional Cabled Array network are examined to study long-term trends. The data originate from station HYS14 located 87 km offshore of Newport, OR. The results indicate that the third-octave band level centered at 63 Hz and attributable to shipping activity is reduced in the spring of 2020 by about 1.6 dB relative to the mean of the prior five years, owing to the reduced economic activity initiated by the COVID-19 pandemic.
Plugged In: New Horizons for Beneficial Electrification in Higher Education
The world’s energy diet is in the midst of transformational change. Fossil fuels, a fundamental driver of progress since the Industrial Revolution, are under pressure for their role in climate change and air pollution.
How Hospitals Can Achieve Net-Zero Energy
Historically high energy users, hospitals do have a pathway to net-zero energy. These tips and real-world case studies illustrate how. Hospitals are among the most energy-intensive facilities. Anchors for help and healing, they are a vital foundation for science and life. Large in size and capacity, hospitals address diverse needs that require round-the-clock use. This means inevitable energy use which often results in lofty and overlooked consumption.
Net-Zero Strategies for Hospitals
As one of the most energy-intensive facilities in our communities, hospitals require around-the-clock functionality, which means inevitable energy use that often results in elevated and unnoticed consumption. The benefits of net-zero buildings have been proven with residential and light commercial facilities. But, with the high energy intensity of a hospital typically located on a restrained site, a net-zero hospital raises new challenges for project design teams.
Physical effects of sound exposure from underwater explosions on Pacific sardines (Sardinops sagax)a)
There is growing concern about the potential effects of anthropogenic sound on aquatic life (e.g., see papers in Popper and Hawkins, 201626. Popper, A. N., and Hawkins, A. D. (2016). The Effects of Noise on Aquatic Life II ( Springer Science+Business Media, New York).). While there have been studies assessing these potential effects on marine mammals (reviewed in NMFS, 201824. NMFS (2018).
Energy-saving ideas for every project
Hospitals are highly complex facilities, and many of the functions that take place within them consume a lot of energy. Together that combination creates a significant opportunity to reduce energy consumption. A new American Society for Health Care Engineering (ASHE) monograph, “Reducing Operational Costs Through Energy Efficiency: Tips, Best Practices, and Case Studies from Energy Star® Hospitals,” describes many of these energy-saving opportunities.
Data Standards: Abbreviations - is Terse Worse?
Ofttimes we are forced to squeeze as much information into a small space as we can manage. Many or most computer systems limit the characters available for describing something and that forces one into the SMS mindset of using acronyms or abbreviations to get concepts across quickly. While it can be amusing in the SMS world, in the world of data that is seldom the case. One needs to very carefully control the use of acronyms and abbreviations.
Parametric Data – Don’t let the “metric” scare you.
It’s funny how looking at different parts of a compound word gives different connotations. In our taxonomy world,has nothing to do with the metric measurement system … it’s all about. Parameters are the “old” version of our current termsor. However, parametric also implies that there is order to the characteristics.Why would we care about order? Ok, that’s a tongue-in-cheek question; order is invariably a good thing.
Data Elements - Duplicate Parts
One of the very first things that happens when one is challenged to reduce the stock of spare parts in inventory – whether it be MRO spares or parts for production – is the search for duplicates byThe results of that search can be interesting, but are those duplicates you found actually duplicates?Before jumping right in and starting to perform drastic surgery, make sure that you investigate the manufacturer’s numbering schema.
Data Standards: Abbreviations - is Terse Worse?
Ofttimes we are forced to squeeze as much information into a small space as we can manage. Many or most computer systems limit the characters available for describing something and that forces one into the SMS mindset of using acronyms or abbreviations to get concepts across quickly. While it can be amusing in the SMS world, in the world of data that is seldom the case. One needs to very carefully control the use of acronyms and abbreviations.
Parametric Data – Don’t let the “metric” scare you.
It’s funny how looking at different parts of a compound word gives different connotations. In our taxonomy world,has nothing to do with the metric measurement system … it’s all about. Parameters are the “old” version of our current termsor. However, parametric also implies that there is order to the characteristics.Why would we care about order? Ok, that’s a tongue-in-cheek question; order is invariably a good thing.
Data Elements - Duplicate Parts
One of the very first things that happens when one is challenged to reduce the stock of spare parts in inventory – whether it be MRO spares or parts for production – is the search for duplicates byThe results of that search can be interesting, but are those duplicates you found actually duplicates?Before jumping right in and starting to perform drastic surgery, make sure that you investigate the manufacturer’s numbering schema.
How fast is a collective bacterial state established?
Bacteria in a biofilm colony have the capacity to monitor the size and growth conditions for the colony and modify their phenotypical behaviour to optimise attacks, defence, migration, etc. The quorum sensing systems controlling this involve production and sensing of diffusive signal molecules. Frequently, quorum sensing systems carry a positive feedback loop which produces a switch at a threshold size of the colony.
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