61 research outputs found
Precipitation of calcium compounds onto rock surfaces in water with cementitious material
In this study, the precipitation of minerals onto rock surfaces was investigated to consider whether sealing of pores and cracks in rock can be accelerated. Cylindrical specimens were prepared and then kept in purified water with powders of high-strength and ultra-low-permeability concrete (HSULPC), which will be used to confine transuranic wastes in Japan. Then, the rock specimens were weighed and the surfaces of rock specimens were inspected under a microscope. It was recognized that precipitation occurred on the surface of the rock specimens. It was also shown that precipitation did not occur on rock specimens kept in water without HSULPC. The weight of all specimens stored in HSULPC increased, and the observed weight change was larger for rocks with higher porosities. It is concluded that precipitation of minerals occurs on the rock surface when the rock is kept in water with HSULPC powders. From the results obtained in this study, it is suggested that the sealing of pores and cracks in rock can be accelerated by the precipitation of calcium compounds using HSULPC. It is concluded that HSULPC is useful for underground radioactive waste disposal
Intermediate Charge-Breaking Phases and Symmetry Non-Restoration in the 2-Higgs-Doublet Model
The Higgs potentials of extended Higgs sectors exhibit a complex and
interesting vacuum structure. When travelling back in time, i.e. going to
higher temperatures, the structure may change and exhibit interesting phase
patterns and sequences of phases related to the respective minima of the
potential. The investigation of the vacuum structure can give us indirect
insights in beyond-Standard-Model physics and the evolution of the Universe. In
this paper, we investigate the possibility of an intermediate charge-breaking
(CB) phase in the 2-Higgs-Doublet Model (2HDM) type I. The existence has been
reported previously by using a simple potential setup. We here confirm that the
intermediate CB phase can still exist when using the one-loop corrected
effective potential including thermal masses. We discuss its features and the
relation with SU(2) symmetry (non-)restoration as well as its consistency with
the current experimental data. Lastly, we show for some selected benchmark
points the rich and interesting phase patterns and sequences that the 2HDM can
undergo during its evolution from the early Universe to today's electroweak
vacuum.Comment: 38 pages, 7 figures, 3 table
The Japanese Society of Pathology Guidelines on the handling of pathological tissue samples for genomic research: Standard operating procedures based on empirical analyses
Genome research using appropriately collected pathological tissue samples is expected to yield breakthroughs in the development of biomarkers and identification of therapeutic targets for diseases such as cancers. In this connection, the Japanese Society of Pathology (JSP) has developed “The JSP Guidelines on the Handling of Pathological Tissue Samples for Genomic Research” based on an abundance of data from empirical analyses of tissue samples collected and stored under various conditions. Tissue samples should be collected from appropriate sites within surgically resected specimens, without disturbing the features on which pathological diagnosis is based, while avoiding bleeding or necrotic foci. They should be collected as soon as possible after resection: at the latest within about 3 h of storage at 4°C. Preferably, snap‐frozen samples should be stored in liquid nitrogen (about −180°C) until use. When intending to use genomic DNA extracted from formalin‐fixed paraffin‐embedded tissue, 10% neutral buffered formalin should be used. Insufficient fixation and overfixation must both be avoided. We hope that pathologists, clinicians, clinical laboratory technicians and biobank operators will come to master the handling of pathological tissue samples based on the standard operating procedures in these Guidelines to yield results that will assist in the realization of genomic medicine
IMPACT OF CLINICAL FRAILTY ON VASCULAR FLOW RESERVE AFTER INFRAPOPLITEAL INTERVENTION IN PATIENTS WITH CRITICAL LIMB ISCHEMIA
CONTRIBUTION OF NEOINTIMAL HEMORRHAGE TO IN-STENT ATHEROMA FORMATION AND AGGRESSIVE NEOINTIMAL HYPERPLASIA AFTER FIRST-GENERATION DRUG-ELUTING STENT IMPLANTATION
Electroweak baryogenesis between broken phases in multi-step phase transition
Possibility of electroweak baryogenesis (EWBG) via multi-step phase transition (PT) is considered. We investigate the EWBG between SU(2) broken phases in the second step PT of the two-step PT. The produced baryon number asymmetry is evaluated using a prototypical model with a SU(2) charged CP-odd scalar field. We show that the second step PTs where the sphaleron rate is possible to be un-suppressed before the PTs, which can reproduce the sufficient baryon number asymmetry. Our studies can be adapted to models with extra SU(2) scalar fields. We discuss specific models suitable for our scenario
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