Showing papers by "Sophia University published in 1995"
TL;DR: The proposed new type of inverse problem by which the spatial distribution of the relative elastic modulus of the tissue can be estimated only from the deformation or strain measurement seems promising for the quantitative differential diagnosis on the lesion in the tissue in vivo.
Abstract: In order to obtain noninvasively quantitative static mechanical properties of living tissue, the authors propose a new type of inverse problem by which the spatial distribution of the relative elastic modulus of the tissue can be estimated only from the deformation or strain measurement. The living tissue is modeled as a linear isotropic incompressible elastic medium which has the spatial distribution of the shear modulus, and the deformation or strain is supposedly measured ultrasonically. Assuming that there is no mechanical source in the region of interest, the authors derive a set of linear equations in which unknowns are the spatial derivatives of the relative shear modulus, and the coefficients are the strain and its spatial derivatives. By solving these equations, the spatial derivatives of the relative shear modulus are determined throughout the region, from which the spatial distribution of the relative shear modulus is obtained by spatial integration. The feasibility of this method was demonstrated using the simulated deformation data of the simple inclusion problem. The proposed method seems promising for the quantitative differential diagnosis on the lesion in the tissue in vivo. >
184 citations
TL;DR: Northern blot analysis employing XhoI-SmaI fragments of the cloned cDNA as probes revealed that expression of the L-SF gene occurred exclusively in the livers of spawning female fish and estrogen-treated male fish and that there was no mRNA encoding L- SF in the ovary of the spawning femaleFish.
118 citations
TL;DR: The feasibility of cell activation/inactivation control by temperature-modulated surface changes is attractive as modulator for biomedical systems and this strategy may lead to development of new ‘intelligent materials' with specific temperature- modulated surface properties.
103 citations
TL;DR: It is shown that the L/sub 2/-induced norm of a closed-loop system with the uncertainty is less than one if an extended nonlinear system with no uncertainty is dissipative with respect to a supply rate.
Abstract: This technical note presents a solution of robust H/sub /spl infin// control problem for an affine nonlinear system with gain bounded uncertainty. It is shown that the L/sub 2/-induced norm of a closed-loop system with the uncertainty is less than one if an extended nonlinear system with no uncertainty is dissipative with respect to a supply rate. In consequence of this result, a state feedback law such that the closed-loop system has H/sub /spl infin// robust performance is derived based on the Hamilton-Jacobi inequality. It is also shown that the existing results for linear systems are special cases of the presented results. >
99 citations
TL;DR: Namikawa and Steenbrink as discussed by the authors studied the relationship between local and global deforma- tions of a threefold Z with isolated hypersurface singularities which admits small resolutions.
Abstract: Yoshinori Namikawa I,*, J.H.M. Steenbrink 2 I Department of Mathematics, Sophia University, Kioi-Cho, Tokyo 102, Japan 2 Mathematical Institute, University of Nijmegen, Toernooiveld, 6525 ED Nijmegen, The Netherlands Oblatum 10-X-1994 & 13-VI-1995 Introduction Friedman [Fr] has studied the relationship between local and global deforma- tions of a threefold Z with isolated hypersurface singularities which admits small resolutions. One of his main results is as follows. Let Z be a Moishezon threefold with only ordinary double points { Pl ..... p. }. Assume that the canon- ical line bundle
98 citations
TL;DR: The results of in situ hybridization to whole embryos at consecutive developmental stages demonstrated that the hatching gland cells located at the most anterior portion of the hypoblast migrated posteriorward to endoderm (pharyngealendoderm) by way of ectoderm, while they were expressing mRNA for the hatch enzyme.
85 citations
TL;DR: In this paper, room temperature molten salts consisting of 1-butylpyridinium halide (chloride or bromide) and aluminium chloride have been utilized as electrolytes for a new class of highly conductive polymer electrolytes.
78 citations
TL;DR: In this paper, the α-helix was investigated using circular dichroism and it was found that α-helicity of the actomyosin from eight species of fish decreased during incubation at 30 o C or at 40 o C. The extent and pattern of decrease differed among species.
Abstract: Participation of the α-helix in setting was investigated using circular dichroism. The α-helicity of the actomyosin from eight species of fish decreased during incubation at 30 o C or at 40 o C. The extent and pattern of decrease differed among species. When rate of decrease was plotted vs rate of increase in strength of gel preincubated at 30 o C or at 40 o C, the two factors correlated closely. We propose that the unfolding of α-helix initiated setting
57 citations
TL;DR: In this paper, a set of jointed structures consisting of simple round rods and simple beam blocks of rectangular cross-section was idealized to simplify the analysis of the three-dimensional vibrations of automobile engine crankshafts under firing conditions.
Abstract: To simplify the analysis of the three-dimensional vibrations of automobile engine crankshafts under firing conditions, the crankshaft was idealized by a set of jointed structures consisting of simple round rods and simple beam blocks of rectangular cross-section. The front pulley, timing gear, and the fly-wheel were idealized by a set of masses and moments of inertia. The main journal bearings were idealized by a set of linear springs and dash-pots. For each constituent member, the dynamic stiffness matrix was derived (in closed form) from the transfer matrix. Then the dynamic stiffness matrix for the total crankshaft system was constructed, and the natural frequencies and mode shapes were calculated. The modeling and analysis procedures were aplied to the analysis of free vibrations of four kinds of crankshafts: single cylinder, three-cylinder in-line, four-cylinder in-line, and V-six engines. The different coupling behavior of the three-dimensional vibrations in the planar-structure and the solid-structure crankshaft is discussed, and the influence of the bearing oil film stiffness on the crankshaft natural frequency is also analyzed
48 citations
TL;DR: In this article, an electrochemical control of drug release was demonstrated by redox-active micelles of non-ionic surfactants having a ferrocenyl moiety (FPEG).
46 citations
09 May 1995
TL;DR: In this article, the authors proposed a sulfur-free wide gap II-VI quaternary compound of MgZnCdSe as a material of visible light emitting devices.
Abstract: We propose sulfur-free wide-gap II-VI quaternary compounds of MgZnCdSe as a material of visible light emitting devices. MgZnCdSe compounds have bandgap energy from 2.1 to 3.6 eV, maintaining lattice-matching to InP substrate. MgZnCdSe lattice-matching quaternary compounds with various Mg composition were grown on (100) InP substrates, for the first time. A wide range of photoluminescence (PL) peak wavelengths from 572 nm (2.17 eV) to 398 nm (3.17 eV) at 15 K was obtained with increasing Mg composition.
TL;DR: The feasibility of cell activation/inactivation or cell attachment/detachment control by temperature-modulated surface changes is attractive for suspension cell culture and drug delivery at targeted sites in vivo.
TL;DR: It is proved that the proposed method and device are effective for hearing and/or measuring lung sounds in noisy environments.
Abstract: Ambient noise such as instrument noise and human voices often disturbs the hearing and/or measurement of lung sounds. Conventional frequency-domain filtering is usually ineffective. Noise is transmitted to the microphone that measures lung sounds through the chest wall around it, and it may be feasible to cancel out the noise by identifying this transfer function. The function, however, may vary with respect to the subject and measuring site, and therefore it should be modified dynamically. We apply an adaptive filtering technique to solve this problem. A workstation-based off-line adaptive noise canceller is developed to assess its performance in detail. Filter coefficients are controlled by a least-mean-square algorithm. Results show that the ambient noise is reduced by about 30 dB in a convergence time of several seconds. A real-time adaptive noise canceller is subsequently implemented by incorporating a digital signal processor, and a prototype electronic stethoscope is realised with high immunity to ambient noise. In a clinical application experiment in which the noise-contaminated lung souds are observed during an airway sensitivity test, satisfactory results are obtained. It is proved that the proposed method and device are effective for hearing and/or measuring lung sounds in noisy environments.
TL;DR: It is considered that rightward attentional bias increased the amplitude of this shift of fixation that was planned on the basis of the perception of the whole line while cueing, and may explain smaller but obvious rightward bisection errors found in the cueing condition.
Abstract: Patients with typical left unilateral spatial neglect bisected lines after cueing to the left end-point, the fixation point being monitored with an eye camera. They persisted with the point of initial fixation made after cueing and placed the mark there without searching leftwards again. The rightward shift of fixation to the initial point of fixation thus determined the location of the subjective midpoint. We consider that rightward attentional bias increased the amplitude of this shift that was planned on the basis of the perception of the whole line while cueing. This hypothesis may explain smaller but obvious rightward bisection errors found in the cueing condition.
TL;DR: In this article, a dithiolatorhodium complex [Rh(Cp)(S2C2Z2)] (2, ZCOOMe) reacts with dimethyl acetylenedicarboxylate (DMAD) to give a 1:1 adduct (3) in 85% yield.
TL;DR: In this paper, the authors argue that the outcome of stabilization and structural adjustment policies, largely based on the neoclassical economic rationale, was justifiable neither in terms of the analytical nor the historical literature.
TL;DR: In this paper, two 2,2′-bipyridine and pyridine as co-existing ligands were synthesized and characterized as cis-[Ru(NO)(X)(pby)(py)2]z+ (X=OH, Cl, NO2 for z = 2; X=py for z=3).
TL;DR: In this paper, the microwave spectrum of trans-nitrosoethylene-15 N was observed in the frequency range from 8.0 to 40.0 GHz and the relational constants of the 15 N species were determined to be A = 50390(201), B = 5057.00(3), and C = 4605.
TL;DR: In this article, a new approach for adhering copper to an epoxy resin was studied, where the copper surface was first treated with hydrogen plasma generated by the atmospheric pressure glow (APG) discharge, and a thin film of γ-aminopropyltriethoxysilane (γ-APS) was formed on the treated copper surface.
Abstract: A new approach for adhering copper to an epoxy resin was studied. In this new approach, the copper surface was first treated with hydrogen plasma generated by the atmospheric pressure glow (APG) discharge. Then a thin film of γ-aminopropyltriethoxysilane (γ-APS) was formed on the treated copper surface. The copper oxide formed by air on the copper surface deteriorated the adhesion by forming a weak boundary layer, part of which could separate from the surface. This oxide layer was reduced when an APG hydrogen plasma was applied for a couple of minutes at a frequency of 13.56 MHz and a power input of 200 W. The resulting peel strength at the copper/epoxy interface increased up to ca. 0.9 Kg/cm. Curing temperature of γ-APS was also an important factor in obtaining good adhesion at the copper/epoxy interface, with the highest value of peel strength occurring at a curing temperature of 120°C.
TL;DR: In this paper, a crankshaft system for a four-cylinder in-line automobile engine was modeled and analyzed using the dynamic stiffness matrix method under firing conditions, where one half of the reciprocating masses consisting of the piston, piston pin, and connecting rod small end were attached to the two ends of the crankpin, taking account of the rigidity of the connecting rod.
Abstract: The modeling and analysis procedures with the dynamic stiffness matrix method described in Part 1 were applied to a crankshaft system, consisting of crankshaft, front pulley, flywheel, piston, and connecting rod, under firing conditions. For firing conditions, (1) one half of the reciprocating masses consisting of the piston, piston pin, and connecting rod small end, and (2) rotating masses of the connecting rod big end mass, were attached to the two ends of the crankpin, taking account of the rigidity of the connecting rod. The excitation forces were calculated from the gas force and the inertia force due to the reciprocating masses. By solving the equations of motion derived in the form of the dynamic stiffness matrix, we calculated the three-dimensional steady-state vibrations of the crankshaft system under firing conditions. A crankshat system for a four-cylinder in-line automobile engine was used for the analysis. We calculated the influence of the mass and moments of inertia of the front pulley on the behavior of the crankshaft vibrations and the excitation induced at the crankjournal bearings. Calculated values were compared with experimental results
TL;DR: In this paper, a spin-wave excitation was observed by using pulsed neutrons from CsVC${\mathrm{l}}_{3}$, an $S\phantom{\rule{0ex}{0ex}}=\phantastic{\rule {0ex} 0ex}}3/2$ Heisenberg antiferromagnetic chain.
Abstract: Well-defined spin-wave excitations were observed by using pulsed neutrons from CsVC${\mathrm{l}}_{3}$, an $S\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3/2$ Heisenberg antiferromagnetic chain. The observed spin-wave dispersion relation shows an enhancement of the excitation energy by a factor of 1.26, which must be compared with the quantum renormalization factor of $\ensuremath{\pi}/2$ for an $S\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1/2$ system. The linewidth of the spectrum at 40 K was broad and independent of $q$. The $q$-independent linewidth is the first experimental observation, which was predicted by rigorous theories for a classical chain at sufficiently low temperature.
TL;DR: A tendency for longer interbirth intervals following the birth of daughters than sons was recognized, in the provisioned Arashiyama troop of Japanese macaques, which may indicate that female infants were more costly to produce than male infants.
Abstract: Based on a sample of 237 live births recorded over a period of 30 years, a tendency for longer interbirth intervals following the birth of daughters than sons was recognized, in the provisioned Arashiyama troop of Japanese macaques. This may indicate that female infants were more costly to produce than male infants. This tendency seemed to be independent of a mother’s rank.
TL;DR: The formation constants of the phosphine and phosphite adducts of several (η5-cyclopentadienyl) (substituted 1,2-ethylenedithiolato) cobalt(III) complexes in acetonitrile were determined spectrophotometrically as discussed by the authors.
TL;DR: In this paper, a small magnetization jump at Bc = 12.5 T in CsCuCl3 found in 1978 has been a mystery for a long time, and it was confirmed by high field neutron diffraction and high field submillimeter wave ESR.
Abstract: A small magnetization jump at Bc = 12.5 T in CsCuCl3 found in 1978 has been a mystery for a long time. In this compound, the magnetization was supposed to be linear because of smooth tilt of the magnetic moments toward the field direction for B || c-axis. Then a jump was completely unexpected by the molecular field model. Recently, Shiba proposed a model where the 120°-structure at low field changes to the coplanar type above Bc due to a quantum effect. This is the first example which shows a quantum effect in high fields very clearly in a magnetic system with strong frustration. This structure is confirmed by high field neutron diffraction and high field submillimeter wave ESR. But the plateau observed in the magnetization for B ⊥ c is still an open question.
TL;DR: In this paper, the voltammetric characteristics of the title adducts [Co(Cp) (S 2 C 2 X 2 L] (X CN, CF 3, COOCH 3, 4-pyridyl, phenyl; L = tributylphosphane or tributially phosphite) in acetonitrile solutions are reported.
TL;DR: In this paper, the effect of compositional modulation in terms of PL spectra, and TEM images for GaInP-AlGaInP MQWR lasers with 18 period (GaP)/sub 1.5/-(InP)/s 1/5/SPBS active layers were described.
Abstract: GaInP-AlGaInP compressively strained multiple quantum-wire layers were fabricated by the in situ strain induced lateral layer ordering process, during gas source molecular beam epitaxial (GS-MBE) growth. The effect of compositional modulation was described in terms of PL spectra, and TEM images for GaInP-AlGaInP MQWR lasers with 18 period (GaP)/sub 1.5/-(InP)/sub 1.5/ SPBS active layers. Based on transmission electron microscopy (TEM) images, the size of quantum-wire width was estimated, and the size fluctuation of quantum wires were discussed. Quantum-wire effect was discussed in terms of anisotropic lasing characteristics and EL polarization, which were reflected by an anisotropic oscillation strength in quantum wires and the comparison with GaInP-AlGaInP compressively strained quantum-film lasers was examined in terms of threshold current density. The condition under which quantum wires were formed by strained induced lateral layer ordering process was discussed in terms of anisotropic behaviors of lasing characteristics, such as threshold current density and lasing wavelength for GaInP-AlGaInP MQWR lasers with (GaP)/sub m//(InP)/sub m/SPBS active layers. The lowest obtained J/sub th/ value was 278 A/cm/sup 2/ under the room temperature (r.t.) pulsed condition. The first CW operation of GaInP-AlGaInp quantum-wire laser was described. Threshold current was 294 A/cm/sup 2/ and CW operation up to 70/spl deg/C was obtained. >
TL;DR: In this article, an experimental and analytical investigation was conducted on the compressive buckling behavior of orthotropic plates with a delamination, where a constrained point is introduced to allow the contact between the two delaminated surfaces.
Abstract: An experimental and analytical investigation is conducted on the compressive buckling behavior of orthotropic plates with a delamination. The plates, which have three simply supported edges and one free edge, are a simplified model of stiffener plates of a stiffened panel. A uniform width delamination is located at their free edges over the whole length. In the analysis, the Rayleigh-Ritz approximation method is adopted. A constrained point is introduced to allow the contact between the two delaminated surfaces. Imaginary springs about relative displacement and two relative slopes are introduced at the constrained point. With the constraint, buckling loads of physically admissible buckling modes can be obtained by ordinary buckling analysis. The global buckling load reduction is found to be significant and almost proportional to the delamination width. Local delamination buckling is found to occur when the delamination is located near the surface and its size is relatively large compared with that of the plate. The local buckling mode is different from the global one, and more wave number in loading direction and constrained points are necessary to obtain physically admissible solutions. The analytical results agree well with the experimental ones.
TL;DR: It is concluded that controlled formation of a defined protein adsorption layer on the 61P3-25 surface via the transient exchange of adsorbed albumin with fibrinogen from plasma, can be a dominant factor in preventing platelet adhesion and activation on this surface.
Abstract: The influence of adsorbed plasma proteins on preventing contact-induced activation of platelets on poly(propylene oxide) (PPO)-segmented nylon-610 surfaces was investigated by monitoring changes in cytoplasmic free Ca2+ concentrations in platelets and adsorption/desorption of albumin and fibrinogen on these copolymer surfaces. Direct measurement of cytoplasmic free Ca2+ concentration in platelets in contact with copolymer surfaces was achieved by monitoring spectral changes of a fluorescent indicator dye, Fura 2. These copolymers were characterized by a surface microstructure composed of coexisting crystalline and amorphous phases. An increase in cytoplasmic free Ca2+ concentration in platelets interacting with polymer surfaces was observed, and this increase was found to be strongly reduced both by the adsorption of plasma proteins into the polymer surface and by modifying the surface microstructure of the polymer itself. Transient changes in cytoplasmic free Ca2+ concentration were observed in platelets in contact with the surface of copolymer 61P3-25, which exhibited excellent nonthrombogenicity in our previous studies, depending on the residence time of plasma and plasma concentration. Additionally, adsorption/desorption of albumin and fibrinogen on copolymer surfaces was estimated using 125I-labeled proteins. Exchange of the adsorbed albumin with fibrinogen and minimum fibrinogen adsorption were observed particularly on the 61P3-25 surface. Exchange of adsorbed fibrinogen with plasma proteins and/or increased fibrinogen adsorption were also observed on all other polymer surfaces examined. Finally, we conclude that controlled formation of a defined protein adsorption layer on the 61P3-25 surface via the transient exchange of adsorbed albumin with fibrinogen from plasma, can be a dominant factor in preventing platelet adhesion and activation on this surface.
TL;DR: In this paper, the lithium isotope separation factors were determined batchwise in a LiOH or (LiCl + LiOH) solution at 25 or 20°C, respectively, for five kinds of inorganic ion exchangers with different ion-sieve properties.
Abstract: Lithium isotope fractionation properties were studied on five kinds of inorganic ion exchangers with different ion-sieve properties. The lithium isotope separation factors were determined batchwise in a LiOH or (LiCl + LiOH) solution at 25 or 20°C, respectively. The separation factor increased in the order birnessite-type manganese oxide ≤ hollandite-type manganese oxide ≤ spinel-type manganese oxides ≤ cubic antimonic acid in the LiOH solution. It was dependent on the pore radius (r is) of the ion-sieve and was a maximum at r is = 0.10 nm. The difference in the separation factor with r is could be well explained by considering two factors; the difference in hydration circumstances of Li+ between the ion-exchanger and the solution phase, and the influence of Li+ stabilization in the solid phase.