Biomedical subjects

Y B Qiu

Publications and source records attributed to Y B Qiu.

4 recordsLinked to original sources

PubMed2001

Theoretical study of opacity for a mixture of gold and gadolinium at a high temperature.

Using the detailed configuration accounting with the term structures treated by the unresolved transition array model, we have presented a method to calculate the spectral-resolved opacity for high temperature and density plasmas. Due to the fully relativistic treatment, incorporated with the quantum defect theory to handle the huge number of transition arrays from configurations with high principal quantum number, we can calculate the opacity of any medium- and high-Z plasmas conveniently. In the present work, the frequency-dependent opacity and the Rosseland mean opacity are calculated for a mixture of gold and gadolinium at a high temperature, 250 eV, and three densities, 0.1 g/cm(3), 1.0 g/cm(3), and 10.0 g/cm(3). Agreement between our theoretical results and experimental measurements and other theoretical simulations is obtained.

Journal Article↗

PubMed1999

[Development of a multi-channel physiological telemetry system].

OBJECTIVE: To develop an instrument used in measurement of physiological parameters in laboratories or field. Method A: computer was used to process data in the telemetry system. The frequency-time division modulation technique was adopted. The low frequency signals were directly connected to the computer serial port after demodulation, and measurement control was achieved by single-chip computer. Temperature measurement results were obtained by conversion table. RESULT: It is capable of telemeter and processing ECG, wind speed and temperature signals in real-time. Good results were gained in high temperature condition and -17 degrees C environment. CONCLUSION: The instrument has many advantages, such as high accuracy, good processing ability, reliability, long operation distance, small volume and easy operation.

Aerospace Medicine↗

PubMed1990

Characteristics of immobilized aminoacylase from Aspergillus oryzae on macroporous copolymers.

Aminoacylase from Aspergillus oryzae was adsorbed on functionallized macroporous copolymers where the enzyme showed excellent catalyzing activity and operation stability. Various factors which effect the activity of the immobilized aminoacylase such as temperature, pH and ionic strength were investigated. The continuous operation of the enzyme immobilized on macroporous copolymers was compared with that of the enzyme immobilized on DEAE-Sephadex.

Amidohydrolases↗

PubMedDate not supplied

Study on immobilization of aminoacylase from Aspergillus oryzae on macroporous copolymers.

The aminoacylase from Aspergillus oryzae was adsorbed on polymer carriers where the enzyme showed excellent catalyzing activity and operating stability. It was found that the pore structure and functional group were the basic factors which affected the activity of the adsorbed enzyme. The hydrophobility of the carriers did not play an important role in the enzymatic resolution. Various factors, such as percentage and nature of cross-linking agent, porogenic agents and functionalizing agents which controlled the pore structure and properties of the polymer carriers during their preparation, were investigated and relationship between the activity of the adsorbed aminoacylase and the carrier structure was also discussed.

Adsorption↗