Publications

Energy Conservation and CO>inf<2>/inf<Reduction by Conversion of Paper Document to Electronic Document using High Speed Color Multifunction Device with Document Flow Software

Electricity and paper consumptions were estimated quantitatively for the cases where paper documents can be easily converted to electronic ones using combination of Fuji Xerox's multifunctional device of DocuCentre Color 450 and Fuji Xerox's software of DocuCentre Flow Service. For the typical case reduction of electricity and paper consumption as high as 15% and 0.79 t was shown to be attained.

Euclid preparation. The Cosmic Dawn Survey (DAWN) of the Euclid Deep and Auxiliary Fields

Euclid will provide deep NIR imaging to $\sim$26.5 AB magnitude over $\sim$59 deg$^2$ in its deep and auxiliary fields. The Cosmic DAWN survey complements the deep Euclid data with matched depth multiwavelength imaging and spectroscopy in the UV--IR to provide consistently processed Euclid selected photometric catalogs, accurate photometric redshifts, and measurements of galaxy properties to a redshift of $z\sim 10$. In this paper, we present an overview of the survey, including the footprints of the survey fields, the existing and planned observations, and the primary science goals for the combined data set.

Room-temperature Coulomb oscillation of Ni-Nb-Zr-H glassy alloys with nanoscale size clusters

Ti‐Zr‐Hf‐Cu‐Niバルクガラス合金の生成,熱的安定性及び機械的性質

No abstract is provided for this article.

Stereochemistry of helvolic acid

No abstract is provided for this article.

Environmentally conscious office equipment

The development of environmentally conscious office equipment at Fuji Xerox is described, taking digital equipment Able1250 and DocuCenter450/550 families as examples. The following are described: (1) power management at standby state; (2) energy saving of electronics circuits; (3) miniaturization of xerographic engine unit; (4) efficient duplex mechanism utilizing digital processing; and (5) reuse of machine parts and recycling of materials.

Zr 50 Cu 30 Ni 10 Al 10 バルクガラス合金の電子ビーム溶接

No abstract is provided for this article.

High-cycle fatigue behavior of Zr-based bulk metallic glasses

No abstract is provided for this article.

A New Fe‐based Bulk Glassy Alloy with Outstanding Mechanical Properties

A new Fe-based bulk glassy alloy with high glass-forming ability, super-high fracture strength, and plasticity is described. The [(Fe0.8Co0.1Ni0.1)0.75B0.2Si0.05]96Nb4 alloy has a super-high strength of over 4000 MPa, the highest yet reported for Fe-based bulk alloys. In compressive failure, a shear band with an angle of 43° relative to the compression direction can be observed by scanning electron microscopy (see Figure).

28a-W-11 Convergent-beam electron diffraction study of a quasicrystal Ales Cu_ Fe_ (III)

Effect of high density excitons on fluorescence of naphthalene-tetracyanobenzene complex crystal

An exciton-exciton collisional annihilation was studied with the naphthalene-tetracyanobenzene complex crystal by observing and analyzing the fluorescence decay curve; the second-order decay constant was determined to be 3 × 10−13 cm3 sec−1 at 77°K. A new type of inhomogeneous broadening effect was found for the fluorescence from the complex crystal excited in high density and was interpreted to be due to the strong electrostatic interaction between the charge-transfer excitons with large dipole moments.

Formation and ultrahigh mechanical strength of multicomponent Co-based bulk glassy alloys

A glassy phase with glass transition (GT) was formed in a wide B content range of 12‒31 at% for (Co0.75Cr0.125Mo0.125)100-xBx alloys. The appearance of GT at the low metalloid content of 12%B among Co-, Fe- and Ni-based alloys is the first, in contrast to the absence of GT for (Fe0.75Cr0.125Mo0.125)88B12 and (Ni0.75Cr0.125Mo0.125)88B12 alloys. The Co-based 12%B glassy alloy crystallized through unique three stages, i.e., glass (G) → [G + hcp + fcc] → [G + fcc] → [fcc + M23B6]. The appearance of GT is due to the necessity of long-range rearrangement of constituent elements for the simultaneous precipitation of hcp and fcc phases from glassy phase. The glass transition temperature, crystallization temperature, Vickers hardness (Hv) and Young's modulus for the Co-based glassy alloys increase linearly with increasing B content and reach 904 K, 946 K, 1566 and 188 GPa, respectively, at 31%B. The good bending plasticity is retained up to 29%B. The crystallization of the 27‒29%B alloy occurs through G → [G + M23B6] → [M23B6 + M2B] and the ultrahigh Hv above 2000 is attained for the metastable [G + M23B6] phase state. The glassy alloy rod with a diameter of 1 mm was prepared for the 27%B alloy and exhibited ultrahigh yield strength of 4700 MPa, plastic strain of 1% and high oxidation resistance up to about 1200 K. The Co-based bulk glassy alloy with simultaneously high strength, ultrahigh hardness and high oxidation resistance, is promising for the future high hardness and heat-resistance materials.

Effect of Zr Composition and Heat-Treatment on Fracture Toughness in Zr-Cu-Al Bulk Metallic Glass

Fracture toughness tests were carried out using different Zr composition in Zr-Cu-Al based bulk metallic glasses (BMGs) and heat-treated those just under the glass transition temperature (Tg) in order to examine the effects of Zr composition and heat-treatment on the fracture toughness (KQ; fracture toughness including the values under unsatisfying the plane strain condition). Zr50Cu40Al10, Zr55Cu35Al10 and Zr60Cu30Al10 BMGs fabricated by a tilt ark casting method were used. Heat-treatments were done for 90 minutes just under the Tgs of each BMG. Tests were conducted based on ASTM E399. Compact type specimen was used (thickness=2.3, 2.0 mm, thickness : width=1 : 4). Fatigue pre-crack was induced under ΔK less than 6 MPa•m1/2 by a servohydraulic fatigue machine and the fracture toughness test was done by using the same machine. The KQ dominantly increased with increasing the Zr composition. The KQ in heat-treated BMGs decreased in comparison with that in unheat-treated BMGs in all Zr composition. In the BMG of the high Zr composition, however, the decrease was small after heat-treatment, and the KQ showed enough high values. In heat-treated BMGs, the dispersion of KQs did not become small, but fatigue pre-cracks were induced more vertical against the loading axis and less bifurcation than those in unheat-treated BMGs.

Unusual gradient stress induced superior room-temperature plasticity in brittle ferromagnetic bulk metallic glass

Ferromagnetic bulk metallic glasses (FBMGs) possess excellent soft magnetic properties, good corrosion resistance, and high strength. Unfortunately, their commercial utility is limited by their brittleness. In this work, we report the enhancement in the room-temperature plasticity during the compression (25%) and bending flexibility of Fe74Mo6P13C7 FBMG by using water quenching. The high-energy synchrotron X-ray measurements, high-resolution transmission electron microscopy, three-dimensional X-ray microtomography, and finite element simulation were performed to reveal the origin. It was found that the M-shape profile of residual stress improves the mechanical properties of FBMGs, particularly their plasticity. The reversal of the heat-transfer coefficient and cooling rate from the ‘vapor blanket’ to ‘nucleate boiling’ transition during water quenching processing is the main cause of the unusual profile of residual stress in glassy cylinders. Encouraged by the progress in developing flexible silicate glasses, this work highlights a processing method to improve plasticity and surmount technical barriers for the commercialization of FBMGs.

Formation, Thermal Stability and Soft Magnetic Properties of Fe-Co-B-Si Amorphous Alloys with Ultrahigh Saturation Magnetic Induction of 2.0 T

This paper studies the influence of metallic element composition on the formation ability, thermal stability and magnetic properties of melt-spun (Fe1-xCox)B15-19Si1 (x=0.2-0.4) amorphous alloy ribbons. The maximum metallic concentration at which an amorphous phase is formed during melt spinning has been determined in conjunction with the metal content dependence of crystallization processes and crystallized phases. The amorphous (Fe0.8Co0.2)84B15Si1 alloy with the highest metal content in an optimally annealed state exhibits an extremely high saturation induction (MS) of 2.0 T, low coercive force of 7.6 A m-1, high effective permeability of 13500 at 1 kHz and low core losses of 5.5 W kg-1 at 100 mT and 19.7 W kg-1 at 200 mT at 10 kHz which have not been simultaneously obtained for all kinds of soft magnetic materials up to date. The replacement of Fe with Co significantly increases the Curie temperature of the amorphous phase, resulting in very high thermal stability of the high Ms alloys. The combination of excellent soft magnetic properties with ultrahigh MS value makes them candidates for use in highly loaded high-speed electric motors capable of operating at temperatures up to 473 K.

Fictive stress model calculations of viscoelastic behaviors in a Zr‐based glassy alloy

Viscoelastic behaviors of a Zr‐based glassy alloy in the glass transition region were investigated with uni‐axial compression tests. The transition between the linear and the nonlinear viscoelasticity was observed just as it was observed in other glassy materials. The transition is considered to be due to a structural change in the glassy structure. Using the relationship taken from experimental results between the steady‐state flow stress and their relaxation time at various temperatures, we make the steady‐state flow stress, which is named fictive stress, stand for the flow structure during deformation. Based on the hypothesis of the stress‐induced structure change and the concept of the fictive stress, we succeeded in demonstrating various characteristic viscoelastic behaviors. The model calculations agreed fairly well with the experimental results. The condition under which the transition occurs and the mechanism of the transition itself in various deformations of a Zr‐based glassy alloy were demonstrated by this model calculation.

Proximity effect in spin sublevel dynamics: Possible influence of a low-lying3 A2 (nπ*) state: On singlet → triplet intersystem crossing of Pyrimidine

Comparison of spin sublevel population rates in pyrimidine and 5-methylpyrimidine suggests that the vibronic perturbation of 3B2 and/or 3A1 ππ* states by a higher-lying 3A2nπ* state plays an important role in S1 → T1 intersystem crossing of pyrimidine. The result also implies that the n+π*—n−π* splitting in pyrimidine is significantly smaller than the corresponding gap in pyrazine. The appearance of the 0.0 band in the τx spectrum indicates that the triplets state symmetry is lower tha C2v.

Fe-base Metal Glass Coating Produced by Gas Tunnel Type Plasma Spraying

Metal glass has excellent functions such as high toughness and corrosion resistance. Therefore it is one of the most attractive materials, and many researchers have conducted various developmental research works. However, the metal glass material is expensive and the composite material is preferred for the industrial application. Thermal spraying method is one of potential candidates to produce those metal glass composites. The gas tunnel type plasma system, which has high energy density and efficiency, is useful for smart plasma processing to obtain high quality ceramic coatings such as alumina (Al2O3) and zirconia (ZrO2) coatings. In this study, the Fe-base metal glass coatings were produced by the gas tunnel type plasma spraying, and the microstructure and mechanical property were investigated. The Fe-base metal glass coatings of 100µm in thickness were formed densely with Vickers hardness of Hv =1000 at plasma current of 300A.