Biography:

In the past Y. Liu has collaborated on articles with C.K. Hu and R.N. Parkins. One of their most recent publications is Case reportIsolation of virulent treponema pallidum from human aorta thirty-two hours after death from cardiovascular syphilis. Which was published in journal The American Journal of Medicine.

More information about Y. Liu research including statistics on their citations can be found on their Copernicus Academic profile page.

Y. Liu's Articles: (346)

Case reportIsolation of virulent treponema pallidum from human aorta thirty-two hours after death from cardiovascular syphilis

AbstractVirulent Treponema pallidum was isolated from the aortic tissue of a patient who died of syphilitic aortitis with aortic regurgitation. The aortic tissue was transferred into the rabbit thirty-two hours after the death of the patient. Viable Treponema pallidum was also isolated from the juxta-articular nodules, but not from the circulating blood nor from the mitral valve tissue. The patient died twenty-five years after acquiring syphilis, without ever receiving specific antisyphilitic treatment.

Case reportIsolation of virulent treponema pallidum from human aorta thirty-two hours after death from cardiovascular syphilis

AbstractVirulent Treponema pallidum was isolated from the aortic tissue of a patient who died of syphilitic aortitis with aortic regurgitation. The aortic tissue was transferred into the rabbit thirty-two hours after the death of the patient. Viable Treponema pallidum was also isolated from the juxta-articular nodules, but not from the circulating blood nor from the mitral valve tissue. The patient died twenty-five years after acquiring syphilis, without ever receiving specific antisyphilitic treatment.

Case reportIsolation of virulent treponema pallidum from human aorta thirty-two hours after death from cardiovascular syphilis

AbstractVirulent Treponema pallidum was isolated from the aortic tissue of a patient who died of syphilitic aortitis with aortic regurgitation. The aortic tissue was transferred into the rabbit thirty-two hours after the death of the patient. Viable Treponema pallidum was also isolated from the juxta-articular nodules, but not from the circulating blood nor from the mitral valve tissue. The patient died twenty-five years after acquiring syphilis, without ever receiving specific antisyphilitic treatment.

Case reportIsolation of virulent treponema pallidum from human aorta thirty-two hours after death from cardiovascular syphilis

AbstractVirulent Treponema pallidum was isolated from the aortic tissue of a patient who died of syphilitic aortitis with aortic regurgitation. The aortic tissue was transferred into the rabbit thirty-two hours after the death of the patient. Viable Treponema pallidum was also isolated from the juxta-articular nodules, but not from the circulating blood nor from the mitral valve tissue. The patient died twenty-five years after acquiring syphilis, without ever receiving specific antisyphilitic treatment.

Case reportIsolation of virulent treponema pallidum from human aorta thirty-two hours after death from cardiovascular syphilis

AbstractVirulent Treponema pallidum was isolated from the aortic tissue of a patient who died of syphilitic aortitis with aortic regurgitation. The aortic tissue was transferred into the rabbit thirty-two hours after the death of the patient. Viable Treponema pallidum was also isolated from the juxta-articular nodules, but not from the circulating blood nor from the mitral valve tissue. The patient died twenty-five years after acquiring syphilis, without ever receiving specific antisyphilitic treatment.

Effects of dynamic straining in an artificial crack on the stress corrosion of a NCMV steel in 10 M NaOH

AbstractPotential and current changes along an artificial crack have been studied as a function of applied potential at the mouth of the crack, temperature and crack aspect ratio in a NCMV turbine disc steel exposed to 10 M NaOH. The approach used was to expose surfaces of the steel, in segmented form to allow current measurements, in a creviced situation simulating a crack, the dynamically straining tip of which was simulated by a tensile specimen located at the remote end of the crack. For cracks having aspect ratios up to about 400, it is shown that potential gradients are likely to be of very limited duration, because of passivation of the crack sides, and evidenced by the decay of current at the steel segments. Consequently the crack tip potential approximates the potential applied at the mouth of the crack and stress corrosion cracking of slow strain rate tensile specimens at the remote end of the crack is indistinguishable from that observed with specimens openly exposed to the bulk solution.

Magneto-optical and structural properties of nanocrystalline MnBi-based films

AbstractIn this paper we discuss recent research on MnBi and MnBiX films where X denotes alloying elements whose purpose is to modify the properties of the parent compound in beneficial ways. While MnBi has a large Kerr response, large uniaxial anisotropy and can be grown in thin-film form with its easy axis normal to the film plane, it also has large grain sizes and a high-temperature structural instability near the Curie point, both of which are detrimental to magneto-optic recording applications. We report systematic studies of Al doping which show that it does not enhance the Kerr response nor eliminate the high temperature structural instability. Al does, however, promote small grain sizes which are required for a low noise magneto-optical recording medium. Preliminary results are reported on sputtered samples with a number of other dopants, and some of these have promising properties.

Study of a surface critical phenomenon associated with surface segregation in CuAg alloys

AbstractThis paper presents a modified regular solution formalism for surface segregation in substitutional alloys which distinguishes between bond energies at the surface and in the bulk of a solid solution. The differences between surface and bulk energies are ascribed to strain energy effects associated with misfitting solutes. Experimental measurements of surface composition on (111) surfaces of CuAg alloys dilute in Ag are reported and show the existence of a surface phase transition, which manifests itself as an abrupt surface composition change at temperatures below 788 K. Similar measurements on (100) surfaces show no comparable critical phenomena down to temperatures as low as 523 K, indicating a strong anisotropic behavior of the surface phase transition. The data are compared with the model to obtain model-based estimates of the surface critical temperatures and the surface regular solution constants for both surface orientations.

Nonlinearly constrained discrete-time optimal-control problems☆

AbstractWe consider a class of constrained discrete-time optimal-control problems. We use the discrete version of the control-parametrization concept together with a simple constraint transcription to devise a computational algorithm for solving this class of problems. Convergence analysis is given to support this numerical approach. For illustration, three nontrivial optimal-control problems are solved using it.

Original articleClonal chromosome abnormalities in 54 cases of ovarian carcinoma☆

AbstractAs a prelude to assessing the relationship of chromosome alterations to clinical outcome in ovarian carcinoma, we report on the cytogenetic analysis on short-term cultures from 54 patients. All patients had histopathologically confirmed malignancy, with the majority of cases demonstrating serous ovarian adenocarcinomas. Structural alterations were evident in 52 cases, whereas numeric changes were identified in 13 cases. The most notable numeric abnormalities were loss of the X-chromosome (913 total cases) and +7 (39 diploid cases). Structural alterations most frequently involved chromosomes 1, 3, 6, 7, 11, and 12. Chromosomal breakpoints were shown to cluster in several chromosomal banding regions, including 1p36, 1p11–q21, 3p23–p10, 7p (especially 7p22), 11p, 11q, 12p13–q12, and 12q24. The frequency of structural alterations involving the following chromosome arms was found to be significantly increased: 1p (p < 0.01), 7p (p < 0.01), 11p (p < 0.01), 11q (p < 0.05), and 12p (p < 0.05). An analysis of the net gain or loss of chromosome segments was also performed, with the most consistent tendency observed being over-representation of 1q and chromosome 7, deletion of 1p, and loss of the X chromosome.

The two-dimensional superconductor-insulator transition

AbstractSuperconductor-to-insulator transitions in ultrathin films can be brought about either by the variation of film properties such as sheet resistance, thickness, and carrier concentration in zero magnetic field, or by the application of a magnetic field. Interest in this problem has been heightened by the prospect that the transitions are zero-temperature quantum phase transitions, which can be described by a Boson-Hubbard model. Variants of this model are relevant to aspects of systems as diverse as helium films, quantum Hall systems, and high temperature superconductors with columnar defects. Ultrathin superconducting films, depending on their properties or the value of the applied magnetic field, exhibit either insulating or superconducting behavior in the limit of zero temperature. However, for films described by certain parameters, or at critical values of the magnetic field, there appears to be a finite, nonzero resistance in the zero temperature limit which has been identified as the resistance at the quantum critical point. The Boson-Hubbard model predicts this resistance to be universal. In the case of the zero-field transition the value of the limiting resistance may indeed be universal and close to the value h4e2, or 6450 Ω.

Magnetic properties of two new low-dimensional copper-halide systems

AbstractPowder magnetic susceptibility measurements on two new, low-dimensional copper-halide systems are reported: (piperazinium)2CuCl6·CH3OH, and (1,2-dimethylpyridinium)2Cu3Br8. The data are analyzed using the high- and low-temperature series expansions for a 1D,S = ½, Heisenberg Hamiltonian, with a mean-field correction to model the interaction between chains. The piperazinium system shows very weak antiferromagnetism with a possibility of two-dimensional behavior. The pyridinium trimer system shows more strongly ferromagnetically coupled doublet ground states between trimers, which comprise the chain.

Letters to the EditorRemanence enhancement in isotropic Sm-Co powders

AbstractThe crystallisation, structure and magnetic properties of Sm-Co powders prepared by mechanical alloying were studied. High values of remanent magnetisation of up to 0.8 Ms were obtained in isotropic nanocrystalline samples after heat treatment. The remanence decreased with increasing crystallite size while the coercivity increased. The presence of the SmCo5 phase resulted in an increase of the coercivity. A maximum energy product of 18 MGOe was measured in optimally treated SM12.5Co87.5.

A unified viscoplastic boundary element approach for residual stress analysis of axisymmetric bodies under axisymmetric and non-axisymmetric loads

AbstractThis paper presents a unified viscoplastic boundary element method (BEM) for the residual stress analysis of axisymmetric structures subjected to axisymmetric and non-axisymmetric loads. By using the Fourier expansions of displacements, tractions and viscoplastic stresses including both the symmetric and anti-symmetric terms, the BEM formulations for an axisymmetric body subjected to axisymmetric and non-axisymmetric loads are developed. A unified viscoplastic model including the actual loading and unloading stress-strain material behaviour can be used to generate plasticity solutions in a simple manner when stationary conditions are reached, and at the other extreme, can reproduce standard creep phenomena. Hence, the viscoplastic BEM program developed in this paper for computing residual stresses of axisymmetric structures allows the treatment of a wide range of materially non-linear problems. The solution algorithm employed is relatively simple and possesses many advantages over the conventional computational procedures utilized in elastoplastic material analysis. Several examples of interest to residual stresses of axisymmetric structures due to axisymmetric and non-axisymmetric loads are presented.

Magnetic and structural properties of high coercivity nanocrystalline CoSm films with in-plane anisotropy

AbstractThis paper presents results and an overview of magnetic and nanostructural properties of CoSm alloys which have high potential for future ultra high-density longitudinal magnetic recording. These sputtered films consist of about 5 nm crystallites embedded in an amorphous matrix, with the easy axes of the nanocrystallites in the film plane. The films have high coercivities, 3–4 kOe, and other highly favorable properties. Fundamental aspects of the relationship between nanostructure and magnetic properties are discussed.

2 - Advanced fibrous architectures for composites in aerospace engineering

AbstractThis chapter discusses the various types of advanced fibrous architectures (woven, knitted, braided and others) that are used for producing composites for various applications in aerospace engineering. It explains the various production techniques for advanced fibrous architectures, as well as their properties, advantages and disadvantages and applications. New developments are also considered.

Numerical study on effects of buffer bulbous bow structure in collisions

ABSTRACTIn order to reduce the risk of cargo leakage in case of ship-to-ship collision, in this paper, a novel bulbous bow is introduced. A numerical simulation by using FEM was conducted to validate its effectiveness compared with the conventional one. Collapse mechanism, force-time curves of the novel bulbous bow structure were investigated and compared with those of conventional bow structure. The computed results indicate that the novel bulbous bow structure is expected to be efficient to reduce the risk of cargo leakage, and the approach of modification on the bulbous bow structure in ship collision accidents protection is reasonable.

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