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Biomedical subjects

Z P Lu

Publications and source records attributed to Z P Lu.

10 recordsLinked to original sources
PubMed2004

Theoretical strength and the onset of plasticity in bulk metallic glasses investigated by nanoindentation with a spherical indenter.

The mechanical behavior of bulk metallic glasses (BMGs) was investigated by nanoindentation with a spherical indenter. The transition from perfectly elastic behavior to plastic deformation was clearly observed as a pop-in event (sudden displacement excursion) on the load-displacement curves. Hertzian stress analysis was used to describe fully the load-displacement behavior during elastic deformation and to determine the theoretical shear strengths of the BMGs.

Journal Article↗
PubMed2004

Structural amorphous steels.

Recent advancement in bulk metallic glasses, whose properties are usually superior to their crystalline counterparts, has stimulated great interest in fabricating bulk amorphous steels. While a great deal of effort has been devoted to this field, the fabrication of structural amorphous steels with large cross sections has remained an alchemist's dream because of the limited glass-forming ability (GFA) of these materials. Here we report the discovery of structural amorphous steels that can be cast into glasses with large cross-section sizes using conventional drop-casting methods. These new steels showed interesting physical, magnetic, and mechanical properties, along with high thermal stability. The underlying mechanisms for the superior GFA of these materials are discussed.

Journal Article↗
PubMed2003

Glass formation criterion for various glass-forming systems.

A conceptual approach to evaluate glass-forming ability for various glass-forming systems has been proposed from a physical metallurgy point of view. It was found that the glass-forming ability for noncrystalline materials was related mainly to two factors, i.e., 1/(T(g)+T(l)) and Tx (wherein Tx is the onset crystallization temperature, T ( g) the glass transition temperature, and T(l) the liquidus temperature), and could be predicated by a unified parameter gamma defined as T(x)/(T(g)+T(l)). This approach was confirmed and validated by experimental data in various glass-forming systems including oxide glasses, cryoprotectants, and metallic glasses.

Journal Article↗
PubMed2001

An evaluation of a polyethersulfone hollow fiber plasma separator by animal experiment.

Membrane plasma separators are being used routinely for therapy in various diseases. In this study, a newly developed plasma separator made of polyethersulfone (PES) hollow fibers was evaluated for its plasma filtration efficiency and blood compatibility by animal experiment. Hemolysis did not occur under the usual conditions of plasma separation. The sieving coefficients of total protein and albumin were over 95%, and the total cholesterol was over 90% throughout the perfusions. Decreases in white blood cells, platelets, fibrinogen, and coagulation factors were observed during the early stage of plasma separation, but appear to be within acceptable ranges for clinical use.

Animals↗
PubMed1997

The drinking behaviors of a sample of university students in Nanning, Guangxi province, People's Republic of China.

A Chinese translation of the Student Alcohol Questionnaire was administered to a sample of 190 students at two universities in Nanning, China. Males consumed alcohol significantly more frequently and in greater quantities than did females. A significantly higher proportion of males also experienced problems resulting from their drinking. Beer was the alcoholic beverage of choice for both males and females. Most students of both genders drank with friends, and most have also consumed with their parents; about half reported that their parents approved of their alcohol consumption. The results support earlier observations that moderate drinking is widely accepted in the Chinese culture and results in few problem.

Adolescent↗
PubMed1996

[Study on the variation and mechanism of diameter of nailfold capillary and its blood flow speed in patient with chronic pain syndrome].

Diameter of nailfold capillaries and their blood flow speed in 90 patients with pain syndrome were measured accurately by using YJD clinical microcirculatory image analyser, and the data obtained were compared with that of 31 normal subjects. The results showed (1) Shortening of capillary loop and slow down of blood flow were revealed in patients no matter where the location of pain was; (2) The disturbance of microcirculation was more prominent in case of chronic pain patient, manifested chiefly as slow down of blood flow speed (0.19 +/- 0.09 mm/s in afferent branch) and increase of loop diameter (15.86 +/- 6.50 microns), as compared with those in normal subjects (0.35 +/- 0.13 mm/s and 14.01 +/- 3.31 microns respectively), the difference were significant, P < 0.01; (3) Typing according to Syndrome Differentiation of TCM, the afferent loop diameter of the Blood Stasis type were 9.23 +/- 1.65 microns, it was significantly different from that of other types; and the blood flow speed of this group was markedly slowing down (0.18 +/- 0.08 mm/s in afferent branch), the change was of significant difference in comparing with normal group, P < 0.01. Authors considered that the mechanism of changes in microcirculation was related to increase of blood viscosity and spasm or diastole of capillaries induced by neurohumoral regulation, and many humoral factors, as histamine, may take part in this procedure.

Adolescent↗
PubMed1995

[Relationship between tongue colour and cardio-vascular function].

The cardiac diastolic and systolic function, arterial compatibility and total arterial resistance of 116 patients was investigated. Using RM-6000 polygraph recorder, five kind of tongue pictures were described, and their impedance cardiogram, carotid arteriogram and their differential spectrum, cardiophonogram and electrocardiogram were examined. The results showed that the PEP index in presphygmic period of purplish tongue group was larger than that of other groups, while the PEP/LVET, HI, SV, SVI and CI indexs of purplish tongue group was less than that of other groups. The cardiac function index of the pale and dark-red tongue group were lower than that of pale-red tongue group. The cardiac function index of red tongue was similar to pale-red tongue. According to cardiac function index, the cardiac function displayed that: pale red tongue > red tongue > dark-red tongue > pale tongue > purplish tongue.

Adolescent↗
PubMed1993

Use of night soil in agriculture and fish farming.

The use of untreated night soil as a fertilizer in agriculture or as a source of nutrients in fish farming presents a considerable health hazard in the form of pathogens and parasites. A pilot study is reported in which night soil was placed in an anaerobic digester, producing biogas and residual organic matter. The latter was introduced into biostabilization ponds, and nutrients were thus obtained for the rearing of fish. Fish ponds receiving nutrients derived from treated night soil were less contaminated than ones to which untreated night soil was applied, and the fish reared in them were of superior quality.

Agriculture↗