Chengdu University of Technology is a Chinese state university, which is located in Chengdu, Sichuan, China. CDUT was established in 1956 on the basis of geo-related faculties from Chongqing University, Nanjing University, Northwest University, Beijing Institute of Geology and Changchun College of Geology . Wikipedia.
Yang H.Q.,Chengdu University of Technology
Zhen ci yan jiu = Acupuncture research / [Zhongguo yi xue ke xue yuan Yi xue qing bao yan jiu suo bian ji] | Year: 2013
To observe the effect of different moxibustion intervention on expression of interleukin-1 (IL-l) and tumor necrosis factor-alpha (TNF-alpha) in the synovial fluid of hind-knee joint in rheumatoid arthritis (RA) rabbits. Forty Japanese big-ear white rabbits (half male and half female) were randomized into normal control, RA model, direct-moxibustion, ginger-partitioned moxibustion and warm moxibustion groups (n= 8). RA model was established by injection of Freund's Complete Adjuvant (0. 5 mL/kg) into the articular cavities of the rabbits' bilateral hind-limbs. Moxibustion intervention was applied to unilateral "Shenshu" (BL 23) and "Zusanli"(ST 36) regions alternatively for 20 min from the 7th day on after modeling, once daily for 3 weeks except Sundays. The circumference of the hindlimb-knee joint was measured using a tape measure and the contents of IL-1 and TNF-alpha in the synovial fluid of articular cavities were detected by ELISA. In comparison with the normal control group, the circumference values of the bilateral hind-knee joints, and the contents of IL-1 and TNF-alpha in the synovial fluid of articular cavities in the model group were significantly increased (P<0. 01). After the moxibustion treatment, compared with the model group, the circumference values of the bilateral hind-knee joints, and IL-1 and TNF-alpha contents of the synovial fluid in the warm moxibustion, direct moxibustion and ginger-partitioned moxibustion groups were remarkably reduced (P<0.01, P<0.05). The effects of the ginger-partitioned group were significantly superior to those of both warm moxibustion and direct moxibustion groups in decreasing the swelled hind-knee joint circumference on day 21 after the treatment and down-regulating synovial fluid inflammatory cytokines IL-1 and TNF-alpha levels (P<0. 05). Warm, direct and ginger-separated moxibustion interventions all can reduce inflammatory reactions of the knee-joint and suppress inflammatory cytokine IL-1 and TNF-alpha levels of the synovial fluid in RA rabbits, which may contribute to its effect in improving RA in clinic. The therapeutic effect of ginger-partitioned muxibustion intervention is apparently better.
Li T.,Chengdu University of Technology
Bulletin of Engineering Geology and the Environment | Year: 2012
Many tunnels along the Dujiangyan to Wenchuan highway, located near the epicenter of the 2008 Wenchuan earthquake in China, were damaged severely. The characteristics of the tunnel failures were analyzed and categorized as avalanches and landsliding near the tunnels, cracking of the tunnel portals, collapse of the liner and surrounding rock, cracking and dislocation of the liner, uplift and cracking of the ground, deformation and cracking of the preliminary bracing. The main geological factors influencing the tunnel damage are secondary fractures of earthquake faults, sudden change in soil and rock type, weak rocks and the variable geo-stresses in the host material. The tunnel portals and their slopes, unless fully integrated into the tunnel structures and sufficiently reinforced, are likely to suffer significant distress as a consequence of seismic events. The main mitigation measures proposed are the use of reinforced concrete in the secondary lining in the area of fault zones and injection grouting to reduce the differences where there are sudden changes in the character of the host material. © 2011 Springer-Verlag.
Huang R.,Chengdu University of Technology
Bulletin of Engineering Geology and the Environment | Year: 2012
Large-scale landslides in western China are famous for their size, complex formation mechanism and serious destruction. Data were collected from some typical large-scale landslides in mainland China in the 20th century. A number of geo-mechanical models have been identified: the "three sections" model (sliding; tension cracking; shearing), "retaining wall collapse", "horizontal-pushing" in horizontal strata; large-scale toppling in counter-inclined strata; the creep-bending-shearing model etc. Large-scale rock landslides are generally accompanied by sudden brittle failure of the "locking section" along the potential sliding surface. The paper discusses the importance of this "locking section" which is key to assessing slope geohazard and to the development of control/mitigation measures. © 2011 Springer-Verlag.
Ye C.,Chengdu University of Technology
Journal of Molecular Liquids | Year: 2013
Liquid-liquid equilibria data have been determined for the ternary system of water + phosphoric acid + organic entrainers (N-pentane, 2-methylpentane and N-hexane) at 308.15 and 328.15 K. Experiments were carried out at atmospheric pressure using stirred and thermo-regulated cells. Ternary phase diagrams were obtained by the experimental solubility and tie-line data. The reliability of the tie-line compositions was ascertained through the Othmer-Tobias equation. The measured liquid-liquid equilibrium data were compared with the non-random two liquid (NRTL) activity coefficient model. Root mean square deviations between experimental and calculated compositions were considered satisfactory. It was showed that the NRTL model of all ternary systems presented very good satisfactory results with root mean square deviations so it was concluded that this model was highly appropriate to calculate thermodynamic properties of the ternary solutions. © 2013 Elsevier B.V.
Yu B.,Chengdu University of Technology
Journal of Sedimentary Research | Year: 2011
Subaqueous channels are formed on subaqueous fans in oceans or lakes by turbidity currents. The subaqueous channels are laid on gentle slopes and are bounded by levees. The sediment in subaqueous channels differs in grain-size distribution in the channel and levee. The process by which a turbidity current flowing over an initially featureless surface creates channels by itself is still incompletely understood. I have addressed the following research question: which combination of turbidity-current factors leads to channelization? In this paper the discharge of turbidity currents, the bottom gradient of the turbidity currents, the settling velocity of sediment, and the range of grain-sizes of the sediment in the turbidity currents were considered for the turbidity-current factors. Some factors such as the sediment concentration of turbidity current, the width of the fan, the kinematic viscosity of water, the density of the particles, and the density of the ambient fluid were not considered. This meant that I had to determine the proper interaction of the following factors: the discharge of turbidity currents, the bottom gradient of the turbidity currents, the settling velocity of sediment, and the range of grain-sizes of the sediment in the turbidity currents. The following (model) testing arrangements were used: a test basin 6 m long with a slope 5 m long that can be inclined between 20% and 0.3%, sediments with four different densities and seven different grain-size distributions were used, with various discharges of turbidity currents. The model tests showed that subaqueous depositional channels can be formed when the dimensionless discharge is an empirical linear function of the gradient of subaqueous fans. The dimensionless discharge of the turbidity current is the product of the square of the grain size and the settling velocity of the sediment, divided by the discharge of the turbidity current. Formulas were developed to narrow down the range of sediment and flow conditions required for channel formation. It is shown that these formulas are applicable not only on the laboratory scale but also on the field scale. © 2011, SEPM.