نتایج جستجو برای: hydrothermal time analysis

تعداد نتایج: 4273069  

Journal: :Chemphyschem : a European journal of chemical physics and physical chemistry 2015
Sylvia Reiche Natalia Kowalew Robert Schlögl

A specific control of the morphology and chemical structure of hydrothermal carbon (HTC) is of crucial importance for its application, both in catalyst supports or electrochemical devices. Here we show how the morphology, that is, particles size and homogeneity, and the distribution of functional groups can be controlled by the control of the synthesis pH of the hydrothermal carbonization. A co...

2006
S. N. White E. T. Peltzer J. J. Freeman P. G. Brewer

[1] The Deep Ocean Raman In Situ Spectrometer (DORISS) instrument was deployed at the Sea Cliff Hydrothermal Field and Hydrate Ridge in July 2004. The first in situ Raman spectra of hydrothermal minerals, fluids, and bacterial mats were obtained. These spectra were analyzed and compared to laboratory Raman measurements of standards and samples collected from the site. Spectra of vent fluid ( 29...

2010
Asli YUKSEL Mitsuru SASAKI Motonobu GOTO

Biodiesel has become an attractive fuel recently, because it is renewable, non-toxic, biodegradable, environmentally friendly, etc. With the increase in the production of biodiesel, the problem of disposing crude glycerol, which is produced as main by-product from biodiesel process such as transesterification, has been raised. Therefore, we have been developing a new green technology-Hydrotherm...

2004
Sharon L. Walker Edward T. Baker Gary J. Massoth Richard N. Hey

[1] A multidisciplinary expedition to the southern East Pacific Rise (27 300–32 200S) provided an opportunity to compare the efficiency and effectiveness of two methods for mapping hydrothermal plumes: the standard conductivity-temperature-depth-optical (CTDO) tow-yo method and a towed fixed array of hydrographic and optical sensors (Miniature Autonomous Plume Recorders (MAPRs)). Six second-ord...

Journal: :Nanoscale 2010
Min Liu Lingyu Piao Weiming Lu Siting Ju Lei Zhao Chunlan Zhou Hailing Li Wenjing Wang

Flower-like TiO(2) nanostructures with exposed {001} facets were synthesized by a low-temperature hydrothermal process from Ti powders for the first time, and they exhibited enhanced photocatalytic degradation of methylene blue dye under ultraviolet light irradiation.

Journal: :Chemical communications 2009
Anuj Kumar Darbha Srinivas Paul Ratnasamy

Framework Ti-substituted, 3-D hexagonal mesoporous, Ti-SBA-12, obtained for the first time by direct hydrothermal synthesis, oxidises bulky molecules such as cyclohexene and cyclooctene to the epoxides with >96% selectivity at high conversion levels (>60%).

2018
Pelayo Salinas-de-León Brennan Phillips David Ebert Mahmood Shivji Florencia Cerutti-Pereyra Cassandra Ruck Charles R Fisher Leigh Marsh

The discovery of deep-sea hydrothermal vents in 1977 challenged our views of ecosystem functioning and yet, the research conducted at these extreme and logistically challenging environments still continues to reveal unique biological processes. Here, we report for the first time, a unique behavior where the deep-sea skate, Bathyraja spinosissima, appears to be actively using the elevated temper...

2015
Shaolong Sun Jialong Wen Shaoni Sun Run-Cang Sun

BACKGROUND Conversion of plant cell walls to bioethanol and bio-based chemicals requires pretreatment as a necessary step to reduce recalcitrance of cell walls to enzymatic and microbial deconstruction. In this study, the sweet sorghum stems were subjected to various hydrothermal pretreatment processes (110°C to 230°C, 0.5 to 2.0 h), and the focus of this work is to systematically evaluate the ...

Journal: :Geobiology 2011
C Konn D Testemale J Querellou N G Holm J L Charlou

Experiments on hydrothermal degradation of Pyrococcus abyssi biomass were conducted at elevated pressure (40 MPa) over a 200-450 °C temperature range in sapphire reaction cells. Few organic compounds could be detected in the 200 °C experiment. This lack was attributed to an incomplete degradation of P. abyssi cells. On the contrary, a wide range of soluble organic molecules were generated at te...

2014
Rika E. Anderson Mitchell L. Sogin John A. Baross Vladimir N. Uversky

The deep-sea hydrothermal vent habitat hosts a diverse community of archaea and bacteria that withstand extreme fluctuations in environmental conditions. Abundant viruses in these systems, a high proportion of which are lysogenic, must also withstand these environmental extremes. Here, we explore the evolutionary strategies of both microorganisms and viruses in hydrothermal systems through comp...

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