26 research outputs found
Wettability and Surface Treatment of Carbon Powder
In investigating the relation between wettability and surface treatment of
carbon powder for fuel cell, air cell, etc., the following results Were obtained:
(1) The surface area of carbon powder increased by steam treatment, but
the contact angle to water decreased somewhat.
(2) The contact angles to water of surface treated carbon powder were in
the 90-94° range. The surface area, hOWever, decreased considerably except
under fluorine gas treatment.
(3) It was found that in treatment with a H2O2 solution in 1 %, the contact
angle of paraffin coated carbon decreased from 91 ° to 50° after 30 minutes. On
the other hand, the contact angles of polyethylene, polystyrene and fluorine gas
treated samples remained constant for 4-6 hours.
(4) The waterproofing effect as a porous carbon electrode was discussed
from changes in the electrode potential of air cell with time. The electrodes
treated by polyethylene and fluorine gas gave good results. Particularly the
electrode treated by fluorine gas showed great promise, despite some problems
in respect to mechanical strength
Inhibition Effect of Hexamethylenetetramine on Corrosion of Mild Steel in Hydrochloric Acid
Cardiotoxicity Associated with Immune Checkpoint Inhibitors
Immune checkpoint inhibitors (ICIs) have shown significant efficacy in various cancers, including non-small cell lung cancer, small cell lung cancer, melanoma, classical Hodgkin lymphoma, head and neck squamous cell carcinoma, urothelial cancer, and renal cell carcinoma [...
Data from: Speciation and subsequent secondary contact in two edaphic endemic primroses driven by Pleistocene climatic oscillation
Climatic perturbation during the Pleistocene era has played a major role in plant evolutionary history by altering species distribution range. However, the relative roles of climatic and geographic factors in the distribution dynamics remains poorly understood; in particular, the edaphic endemics. In this paper, we examine the evolutionary history of two ultramafic primroses, Primula hidakana and P. takedana. These species are ecologically and morphologically distinct with disjunct distributions on Hokkaido Island, Japan. Primula hidakana is found on various rocks in southern Hokkaido and P. takedana in serpentine areas in northern Hokkaido. We performed population genetics analyses on nuclear and chloroplast data sets and tested alternative phylogenetic models of divergence using approximate Bayesian computation (ABC) analyses. Nuclear microsatellite loci clearly distinguished the two sister taxa. In contrast, chloroplast sequence variations were shared between P. takedana and P. hidakana. ABC analyses based on nuclear data supported a secondary contact scenario involving asymmetrical gene flow from P. hidakana to P. takedana. Paleodistribution modeling also supported the divergence model, and predicted their latitudinal range shifts leading to past secondary contact. Our findings highlight the importance of the distribution dynamics during the Pleistocene climatic oscillations in the evolution of serpentine plants, and demonstrate that tight species cohesion between serpentine and non-serpentine sister taxa has been maintained despite past interspecific gene flow across soil boundaries
A two-step processing route for achieving a superplastic forming capability in dilute magnesium alloys
Superplastic ductilities were achieved in a dilute magnesium alloy containing 0.6% Zr through the use of a two-step processing procedure in which the basal planes are initially aligned through extrusion and the grain size is then refined using equal-channel angular pressing. The results show a maximum tensile elongation of >400% at 573 K when using an initial strain rate of 3.3×10?4 s?1