ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

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Magnetic anisotropy of amorphous (Fe1−x Co x )78Si10B12 alloys (1979)

Morita, H. ; Fujimori, H. ; Obi, Y.

Springer

Applied physics 20 (1979), S. 125-127

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ISSN: 1432-0630

Keywords: 75.30

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Abstract In order to better understand the problem of magnetic anisotropy in amorphous alloys produced by a rapidly quenching technique, in-plane magnetic anisotropy of amorphous (Fe1−x Co x (78Si10B12 alloys was measured by means of a torque magnetometer using a disk specimen made from the amorphous alloy ribbon. The amorphous ribbons were prepared by a single roller type quenching apparatus. It was found that the anisotropy had mostly twofold symmetry in all the alloy cases, and that the concentrationx dependence of the anisotropy constant behaved differently from that of the magnetostriction. Moreover, the anisotropy did not disappear by subsequent annealing at high temperatures where the internal stress relief and the crystallization were completed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00885932

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2

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The magnetic anisotropy of cold-rolled and as-quenched amorphous (Fe1−x Ni x )78Si10B12 alloy systems (1980)

Morita, H. ; Obi, Y.

Springer

Applied physics 22 (1980), S. 313-315

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ISSN: 1432-0630

Keywords: 75.30

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Abstract In order to make clear the origin of magnetic anisotropy of amorphous alloys produced by a single roller quenching method, the composition dependence of the in-plane magnetic anisotropy of cold-rolled and as-quenched amorphous (Fe1− x Ni x )78Si10B12 alloy systems was studied at room temperature. The twofold in-plane magnetic anisotropy constantK u of cold rolled and as-quenched specimen decreases with increase inx at the Fe-rich side, and increases drastically at aboutx=0.2. Beyondx=0.25,K u decreases gradually with further increase inx. From this study, it is emphasized that there is a clear correspondence between the atomic ratio of Fe to Ni at which the anomaly in magnetic anisotropy of the amorphous alloy occurs and the position of the fcc/bcc phase boundary in the Fe−Ni metal alloy system.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00899884

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3

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Magnetic and electrical properties of several Mn-based amorphous alloys (1987)

Obi, Y. ; Morita, H. ; Fujimori, H.

Springer

Applied physics 42 (1987), S. 201-204

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ISSN: 1432-0630

Keywords: 61.40 ; 75.50

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Abstract Magnetic and electrical properties of amorphous Mn-Y, Mn-Zr, and Mn-Nb alloys have been investigated. All these alloys have a temperature-dependent susceptibility which is well fitted by a Curie-Weiss law. This implies the existence of localized magnetic moments associated with the Mn atoms. In addition, amorphous Mn-Y alloys exhibit spin-glass characteristics at low temperature. The experimental results of the electrical resistivity show that the temperature coefficient of resistivity (TCR) of both Mn-Y and Mn-Zr are negative, while Mn-Nb has a positive TCR. On the other hand, the resistivity-temperature curves of Mn-Zr and Mn-Nb have nearly the same tendency but are different from that of Mn-Y.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00620600

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4

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Association of Methylenetetrahydrofolate Reductase (MTHFR) Polymorphism with Bone Mineral Density in Postmenopausal Japanese Women (2000)

Miyao, M. ; Morita, H. ; Hosoi, T. ; [et al.]

Springer

Calcified tissue international 66 (2000), S. 190-194

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ISSN: 1432-0827

Keywords: Key words: Osteoporosis — Bone mineral density — Genetic risk factor — Methylenetetrahydrofolate reductase — Homocysteine.

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine , Physics

Notes: Abstract. The pathogenesis of osteoporosis is controlled by genetic and environmental factors. Considering the high prevalence of osteoporosis in homocystinuria, abnormal homocysteine metabolism would contribute to the pathogenesis of osteoporosis. It is known that the polymorphism of methylenetetrahydrofolate reductase (MTHFR), the enzyme catalyzing the reduction of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate, correlates with hyperhomocysteinemia. In this study, we examined the association of this polymorphism with bone mineral density (BMD). BMD was measured by dual-energy X-ray absorptiometry (DXA) in 307 postmenopausal women. MTHFR A/V polymorphism was analyzed using polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP). We compared BMD, clinical characteristics, and bone metabolic markers among MTHFR groups (AA, AV, VV). The groups did not differ in terms of baseline data. The values of lumbar spine BMD and total body BMD were as follows: lumbar spine: AA, 0.91 ± 0.18, AV, 0.88 ± 0.16, VV, 0.84 ± 0.14 g/cm2; total body: AA, 0.97 ± 0.11, AV, 0.96 ± 0.11, VV, 0.93 ± 0.09 g/cm2. In the VV genotype, lumbar spine BMD values were significantly lower than those of the women with the AA genotype (P= 0.016) and total body BMD was significantly lower than those of the women with AA genotype (P= 0.03) and AV genotype (P= 0.04). This is the first report that suggests that the VV genotype of MTHFR is one of the genetic risk factors for low BMD.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s002230010038

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5

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CNDO/2 calculations and configuration analyses for some hydrogen-bonded systems (1972)

Morita, H. ; Nagakura, S.

Springer

Theoretical chemistry accounts 27 (1972), S. 325-338

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ISSN: 1432-2234

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Zusammenfassung Die Kurven potentieller Energie von Systemen mit H-Brücken wurden im Fall von H2O-, CH3OH- und HCOOH-Dimeren und für das Hydrogen-Maleatanion mittels eines modifizierten CNDO-Verfahrens berechnet, wo für Rumpf-σ- und -π-Elektronen jeweils verschiedene Resonanzintegrale und verschiedene Bindungsparameter für =O und -O- verwendet und wo die Rumpfpotential-Integrale für O-H, C=O und O...O semiempirisch bestimmt werden. Die Resultate sind 1) eine Potentialkurve mit einem einfachen Minimum für lineare Ketten von H2O und CH3OH, 2) eine symmetrische Potentialkurve mit zwei Minima für das cyclische Diniere von HCOOH und 3) eine Potentialkurve mit einem flachen Minimum für das Maleatanion. Konfigurationsanalyse ergab einen Beitrag von 39% für die ionischen Strukturen.

Notes: Abstract The potential energy curves of hydrogen-bonded systems were calculated for the water, methanol, and formic acid dimers and for the hydrogen maleate ion by a modified CNDO/2 method, the core resonance integrals betweenσ-electrons being distinguished from those betweenπ-electrons, the different bonding parameters being used for -O- and =O, and the core potential integralsV AB c for O-H, C=O, and O...O being determined semi-empirically. Consequently, the following results were obtained: 1) a potential energy curve with a single minimum atr(O-H)=0.95 Å and with a concavity near 1.70 Å for the linear chain dimers of water and methanol; 2) a symmetrical potential energy curve with two minima atr(O-H)=0.95 and 1.78 Å for the cyclic dimer of formic acid; 3) a flat-bottomed symmetrical potential energy curve for the hydrogen maleate ion. The configuration analysis method was applied to the hydrogen-bonded systems; the contributions of the covalent ((O-H-O)−1) and ionic (O−H+O−) structures being 54% and 39%, respectively, for the symmetrical hydrogen bonding of the hydrogen maleate ion.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00868858

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6

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The influence of surfactant on the alkali-thickening of acrylic emulsions (1965)

Tyuzyo, K. ; Harada, Y. ; Morita, H.

Springer

Colloid & polymer science 201 (1965), S. 155-157

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ISSN: 1435-1536

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01520500

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7

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Breath-by-breath measurement of alveolar gas exchange with a slow-response gas analyser (1987)

Yamamoto, Y. ; Takei, Y. ; Mokushi, K. ; [et al.]

Springer

Medical & biological engineering & computing 25 (1987), S. 141-146

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ISSN: 1741-0444

Keywords: Alveolar gas exchange ; Breath ; Gas analyser

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology , Medicine

Notes: Abstract The O2-paramagnetic or polarographic and CO2-infra-red expired gas analyser have a response delay which results in an underestimation in breath-by-breath $$\dot vO_2 $$ and $$\dot vCO_2 $$ calculations. In this study, correction for this delay has been made. After measuring the step response of the O2-polarographic and CO2-infra-red analyser, the damping factor and the natural angular frequency were determined as well as the time constant, assuming the response was a first-order one. $$\dot vO_2 $$ and $$\dot vCO_2 $$ were calculated when the response of the analyser was corrected for the first- and second-order responses using the inverse Laplace transform. For the uncorrected $$\dot vO_2 $$ and $$\dot vCO_2 $$ , values from the breath-by-breath method were 27·5 and 18·1 per cent systematically underestimated (p〈0·001) compared with those of the Douglas bag method. When correction for the first-order response was made, values of the breath-by-breath method became equivalent to those of the Douglas bag method for $$\dot vCO_2 $$ whereas there was still a 17·5 per cent systematic underestimation (p〈0·001) for $$\dot vO_2 $$ . The correction for the second-order response gave equivalence and significant correlation (p〈0·001) between the values of both methods for $$\dot vO_2 $$ and $$\dot vCO_2 $$ . These results might indicate that breath-by-breath measurement of alveolar gas exchange with a slow-response gas analyser is valid when a second-order response delay correction is used.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02442842

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