Microbial response to organic particle generation by surface coagulation in seawater

1988 ◽  
Vol 48 ◽  
pp. 193-198 ◽  
Author(s):  
PE Kepkay ◽  
BD Johnson
Keyword(s):  
Particle Generation ◽  
Microbial Response ◽  
Organic Particle

Particle characterization of CVD tungsten metallization for 64 MBIT DRAM

1991 ◽  
Vol 49 ◽  
pp. 896-897
Author(s):  
Marylyn Bennett-Lilley ◽  
Thomas T.H. Fu ◽  
David D. Yin ◽  
R. Allen Bowling
Keyword(s):  
Chemical Vapor ◽  
Device Performance ◽  
Particle Characterization ◽  
Particle Generation ◽  
Tungsten Hexafluoride ◽  
Homogeneous Particle ◽  
Multiple Levels ◽  
Circuit Density ◽  
Sources Of Contamination

Chemical Vapor Deposition (CVD) tungsten metallization is used to increase VLSI device performance due to its low resistivity, and improved reliability over other metallization schemes. Because of its conformal nature as a blanket film, CVD-W has been adapted to multiple levels of metal which increases circuit density. It has been used to fabricate 16 MBIT DRAM technology in a manufacturing environment, and is the metallization for 64 MBIT DRAM technology currently under development. In this work, we investigate some sources of contamination. One possible source of contamination is impurities in the feed tungsten hexafluoride (WF6) gas. Another is particle generation from the various reactor components. Another generation source is homogeneous particle generation of particles from the WF6 gas itself. The purpose of this work is to investigate and analyze CVD-W process-generated particles, and establish a particle characterization methodology.

Hard X-ray radiation and fast particle generation using multiterawatt laser pulses

1999 ◽  
Vol 169 (1) ◽  
pp. 72 ◽  
Author(s):  
Aleksandr A. Andreev ◽  
V.E. Yashin ◽  
Aleksandr V. Charukhchev
Keyword(s):  
Laser Pulses ◽  
Fast Particle ◽  
X Ray ◽  
Particle Generation

scholarly journals Invertebrate and Microbial Response to Hyporheic Restoration of an Urban Stream

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 481
Author(s):  
Sarah A. Morley ◽  
Linda D. Rhodes ◽  
Anne E. Baxter ◽  
Giles W. Goetz ◽  
Abigail H. Wells ◽  
...  
Keyword(s):  
Hyporheic Zone ◽  
Habitat Diversity ◽  
Urban Stream ◽  
Floodplain Restoration ◽  
Design Elements ◽  
Biological Communities ◽  
Taxa Richness ◽  
Restoration Technique ◽  
Microbial Response ◽  
Face Complex

All cities face complex challenges managing urban stormwater while also protecting urban water bodies. Green stormwater infrastructure and process-based restoration offer alternative strategies that prioritize watershed connectivity. We report on a new urban floodplain restoration technique being tested in the City of Seattle, USA: an engineered hyporheic zone. The hyporheic zone has long been an overlooked component in floodplain restoration. Yet this subsurface area offers enormous potential for stormwater amelioration and is a critical component of healthy streams. From 2014 to 2017, we measured hyporheic temperature, nutrients, and microbial and invertebrate communities at three paired stream reaches with and without hyporheic restoration. At two of the three pairs, water temperature was significantly lower at the restored reach, while dissolved organic carbon and microbial metabolism were higher. Hyporheic invertebrate density and taxa richness were significantly higher across all three restored reaches. These are some of the first quantified responses of hyporheic biological communities to restoration. Our results complement earlier reports of enhanced hydrologic and chemical functioning of the engineered hyporheic zone. Together, this research demonstrates that incorporation of hyporheic design elements in floodplain restoration can enhance temperature moderation, habitat diversity, contaminant filtration, and the biological health of urban streams.

Soil microbial response to silicate fertilization reduces bioavailable arsenic in contaminated paddies

2021 ◽  
pp. 108307
Author(s):  
Suvendu Das ◽  
Hyun Young Hwang ◽  
Hyeon Ji Song ◽  
Song Rae Cho ◽  
Joy D. Van Nostrand ◽  
...  
Keyword(s):  
Soil Microbial ◽  
Microbial Response

Overview of Forming and Formability Issues for High Volume Aluminium Car Body Panels

2006 ◽  
Vol 519-521 ◽  
pp. 795-802 ◽  
Author(s):  
Dominique Daniel ◽  
Gilles Guiglionda ◽  
Pierre Litalien ◽  
Ravi Shahani
Keyword(s):  
New Technologies ◽  
High Volume ◽  
Production Lines ◽  
Particle Generation ◽  
Car Body ◽  
Conventional Technology ◽  
Sheet Products ◽  
Cost Efficient ◽  
Aluminum Panels ◽  
Fine Tune

Cost-efficient designs of aluminum autobody structures consist mainly of stampings using conventional technology. Progress in metallurgy and forming processes has enabled aluminum body panels to achieve significant market share, particularly for hoods. Fast bake hardening alloys with better hemming performance were developed for improved outer panel sheet products. Specific guidelines for handling and press working were established to form aluminum panels using similar schedules and production lines as steel parts. Stamping productivity was improved by optimization of the trimming process to reduce sliver/particle generation and resulting end-of-line manual rework. Both hemming formability and trimming quality not only depend on tooling setup but also on microstructural features, which govern intrinsic alloy ductility. Targets for the next high volume aluminum car body applications, such as roof panels and doors, require higher strength and/or better formability. The challenges of complex stampings can be met with optimized alloys and lubricants, with improved numerical simulation to fine-tune stamping process parameters, and with the introduction of new technologies. Warm forming was examined as a potential breakthrough technology for high volume stamping of complex geometries.

scholarly journals Zooplankton grazing of microplastic can accelerate global loss of ocean oxygen

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
K. Kvale ◽  
A. E. F. Prowe ◽  
C.-T. Chien ◽  
A. Landolfi ◽  
A. Oschlies
Keyword(s):  
North Pacific ◽  
Grazing Pressure ◽  
System Model ◽  
Earth System ◽  
Primary Producers ◽  
Climate Research ◽  
The North ◽  
Zooplankton Consumption ◽  
The North Pacific ◽  
Organic Particle

AbstractGlobal warming has driven a loss of dissolved oxygen in the ocean in recent decades. We demonstrate the potential for an additional anthropogenic driver of deoxygenation, in which zooplankton consumption of microplastic reduces the grazing on primary producers. In regions where primary production is not limited by macronutrient availability, the reduction of grazing pressure on primary producers causes export production to increase. Consequently, organic particle remineralisation in these regions increases. Employing a comprehensive Earth system model of intermediate complexity, we estimate this additional remineralisation could decrease water column oxygen inventory by as much as 10% in the North Pacific and accelerate global oxygen inventory loss by an extra 0.2–0.5% relative to 1960 values by the year 2020. Although significant uncertainty accompanies these estimates, the potential for physical pollution to have a globally significant biogeochemical signal that exacerbates the consequences of climate warming is a novel feedback not yet considered in climate research.

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