236 research outputs found
Supplementary videos to Kawagucci et al. "Deep-sea freezer" Front Mar Sci (2023).
No full textSupplementary videos in high-resolution for: Kawagucci S, Matsui Y, Nomaki H, Chen C (2023). Deep-sea freezer. Frontiers in Marine Science, 10: 1179818. DOI: 10.3389/fmars.2023.1179818
SUPPLEMENTARY VIDEO 1
Time-lapse of the DSF-a during the in situ examination on-board ROV Hyper-Dolphin. Timestamps are in JST (Japan Standard Time).
SUPPLEMENTARY VIDEO 2
Time-lapse of ice formation during Assessment Test 3 mimicking the deepsea condition, with the DSF-a powered on and water bath set to 6°C. The video is speeded up 10x.
SUPPLEMENTARY VIDEO 3
Time-lapse of ice melting during Assessment Test 3 (following on from ice formation in Supplementary Video 2), when the DSF-a was powered off and water bath was gradually heated up. The video is speeded up 10x. </p
Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, Okinawa Trough
No full textCompositional and isotopic characteristics of hydrocarbons generated by a hydrothermal experiment simulating seafloor sediment alteration stepwise heating from 275 to 361 degrees C at 30 MPa
No full textAuthor Posting. © The Geochemical Society of Japan, 2019. This article is posted here by permission of The Geochemical Society of Japan for personal use, not for redistribution. The definitive version was published in Kawagucci, S., & Seewald, J. S. Compositional and isotopic characteristics of hydrocarbons generated by a hydrothermal experiment simulating seafloor sediment alteration stepwise heating from 275 to 361 degrees C at 30 MPa. Geochemical Journal, 53(4), (2019): 281-291, doi:10.2343/geochemj.2.0566.We conducted a laboratory hydrothermal experiment that simulated generation of low molecular-weight hydrocarbons during seafloor sediment alteration at 275–361°C and 30 MPa. The abundance and carbon and hydrogen stable isotope composition of low molecular weight thermogenic hydrocarbons in the fluids were determined. In general, the abundance of C1−C4 alkanes increased with time. The abundance of CH4 relative to C2−C4 alkanes as reflected by C1/C2+ ratios showed progressive increases from 1.2 to 4.3 with continued sediment heating. Alkenes were enriched in early phase and decreased with time. Carbon isotope ratios (δ13C) of thermogenic CH4 ranged between –42.0~−24.2‰. Carbon isotope ratios of C2H6 and C3H8 were similar to each other throughout the experiment (δ13C = –28.0~−20.3‰). In general, the carbon isotope ratios of C1−C4 alkanes were more close to those of substrate organic matter in larger carbon numbers and at later periods of the experiment. Hydrogen isotope ratios (δD) of CH4 varied from –325~−262‰, more negative than those expected at the isotope equilibrium between CH4 and H2O. Compared with results from the experiment, natural hydrothermal fluids show higher C1/C2+ ratio, more diverse δ13CCH4 values among the fields, higher δ13CC2 values, and higher δDCH4 values. The differences likely result from lower maturity of the experimental fluid and biogenic methane contribution to the natural fluids.The InterRidge, a non-profit organization concerned with promoting all aspects of mid-ocean ridge research, provided the Postdoctoral fellowship in 2010 to SK for the internationally collaborative experiment in this study. We wish to thank Sean Sylva and Uta Konno for their professional assistance on the hydrothermal experiment and chemical analysis. SK would like to also thank Prof. Gretchen Bernasconi-Green for providing space and opportunity to prepare the manuscript as an academic visitor of ETH Zurich in 2016
Protected Culture for Vegetable and Small Fruit Crops: Types of Structures
No full textA protective structure is defined as any structure designed to modify the environment in which plants are grown. Protective structures, such as greenhouses, screen houses, and tunnels, are known worldwide as production systems for high-quality vegetable and fruit crops.
This minor revision by Shinsuke Agehara adds updated information regarding 2015 revisions to the Worker Protection Standards in the last paragraph, and removes one former author no longer affiliated with UF.
https://edis.ifas.ufl.edu/hs1224
Previous version: Santos, Bielinski, Gary Vallad, and Emmanuel Torres-Quezada. 2013. “Protected Culture for Vegetable and Small Fruit Crops: Types of Structures”. EDIS 2013 (7). https://journals.flvc.org/edis/article/view/121080
- …
