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Article
Resonant tunneling at electron field emission from Si tips coated with SiO2(Si) films
The electron field emission from Si tips coated with ultrathin nanocomposite SiO2(Si) films containing Si nanocrystals embedded into silicon dioxide matrix of varying thickness have been investigated. The peaks ...
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Article
Preparation of silica-based titanate adsorbents and application for strontium removal from radioactive contaminated wastewater
K2Ti6O13/SiO2 adsorbents were prepared by sol–gel method and good microcrystalline K2Ti6O13 phases were formed at 500 °C. From EDS of the adsorbents before and after adsorption of Sr2+ it showed that there was io...
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Article
Blue and Green Electroluminescence from Porous Materials
In applying porous Si (PS) to color display technology, it is important to fabricate light emitting devices with three primary colors. However, there have been few reports on blue and green electroluminescence...
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Article
The effect of shock pressures on the inactivation of a marine Vibrio sp.
The effect of shock pressures on the inactivation of a marine Vibrio sp. was studied experimentally and numerically. In the experiment, an aluminum impactor plate accelerated by a gas gun was used to induce shock...
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Article
Transcatheter Embolization of Pulmonary Artery False Aneurysm Associated with Primary Pulmonary Hypertension
A 29-year-old woman with primary pulmonary hypertension presented with recurrent hemoptysis. Contrast-enhanced CT of the chest demonstrated the enhanced mass surrounded by consolidation related to parenchymal ...
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Article
Separation of americium from europium by biopolymer microcapsules enclosing Cyanex 301 extractant
Microcapsules enclosing an extractant with strong affinity for Am were prepared by employing a biopolymer gel as an immobilization matrix. A relatively large separation factor between Am and Eu was exhibited b...
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Article
Uptake behavior of americium on alginic acid and alginate polymer gels
The uptake behavior of Am3+ was investigated by using alginic acid and alginate polymer gels. The affinity of radioactive nuclides for carboxyl groups in gel matrices increased in the order of Na+ < Cs+ < Co2+ < ...
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Article
Integrins and osteoclast polarization
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Article
Surface Alteration of Sintered Product of Strontium Aluminum Silicate Under Hydrothermal Conditions
The surface alteration of strontium aluminum silicate has been studied under hydrothermal conditions in connection with the leachability of Sr from solidified radioactive wastes. Samples exposed to a 3 M NaCl ...
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Article
Initial Stage Carrier Dynamics in Porous Silicon Using Ultrafast Spectroscopy
We have studied the electronic relaxation processes in porous silicon using a femtosecond pump and probe pulse-correlation technique at 440— nm wavelength. We have observed photoinduced absorption with a respo...
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Article
Visible Photoluminescence From Porous Silicon Carbide
We have fabricated porous silicon carbide using single crystal 6H— SiC that has a wider indirect bandgap than silicon crystal prepared by electrochemical anodization. We have observed intense blue—green lumine...
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Article
Optical Properties of Free-Standing Porous Si Films
We have studied optical properties of free-standing porous Si thin films fabricated by electrochemical anodization. The average diameter of Si crystallite spheres is evaluated by Raman spectroscopy and transmi...
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Article
Electroluminescence From μc-SiC / Porous Si PN Junctions
We have measured electrical properties and electroluminescence (EL) characteristics of the light-emitting diode (LED) based on a pn junction of n-type microcrystalline silicon carbide (µc-SiC) and porous silic...
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Article
Visible Photoluminescence from Rapid-Thermal-Oxidized Porous Silicon
We have studied the origin of the visible photoluminescence (PL) from oxidized porous Si. The hydrogen-passivated surface of porous Si prepared by electrochemical etching is converted to stable silicon oxides ...
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Article
A High Speed Contact-Type Image Sensor using Amorphous Silicon Alloy Pin Diodes
A new A4-size contact-type image sensor with 8 elements per millimeter (1,728 elements) was developed by using amorphous silicon alloy pin photodiodes as the light receiving elements. The matrix switching meth...
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Article
Visible Electroluminescence from PN Junction Type μc-SiC/ Porous Si / c-Si Structures
We have fabricated two kinds of n-type microcrystalline silicon carbon (μc-SiC) / porous silicon (PS) / p-type crystalline silicon (c-Si) pn junctions and demonstrated a visible light emission from them. We have ...
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Article
Photochemical Etching Effects on Optical Properties of Porous Silicon
We have studied effects of hydrogen-termination on optical properties of porous Si. The hydrogen concentration in the samples was controlled by photochemical etching after the electrochemical anodization. Tran...
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Article
Picosecond Decay Dynamics in Porous Silicon
Picosecond decay dynamics of luminescent porous silicon has been studied using the second harmonics (SH) of a cw modelocked YLF laser and a synchroscan streak camera. Picosecond luminescence decay shows nonexp...
