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The simulator based on interactive virtual reality can solve many drawbacks in traditional surgery training, and it is widely used to train apprentices. A real-time and realistic guidewire model is a challenging task for the simulator, which is used to simulate minimally invasive vascular surgery. In this paper, we propose a fast and stable physical model to simulate the behavior of the guidewire...
An optical ac-current sensor with large range and high accuracy is designed, which is based on magnetostriction effect and fiber-loop cavity ring-down technique. The model of the sensor is proposed which discribed the relationship of current, magnetic field, strain and ring-down time of the fiber loop. Simulation results show that both the measurement range and accuracy of the sensor are depended...
Salmonella pullorum was induced using liquid lysogeny broth medium at 4°C into viable but non-culturable (VBNC) state. The activated VBNC genes were screened by mRNA differential display. VBNC bacteria transformed to the spherical-rods or spherical shape and aggregated. Sequence analysis showed two VBNC differential fragments respectively belonged to partial sequences of ATP-dependent RNA unwindase...
The ability of Listeria monocytogenes resisting bile stress is very important for its successful infection and colonization in the human gastrointestinal tract. Some studies have indicated that the alternative sigma factor Sigma B (σB), encoded by sigB, is at least partly involved in bacteria resisting many adverse conditions. In order to investigate the role of L. monocytogenes Sigma B in bile tolerance...
In the light of the temperature crack problem of the construction of RCCD during cold winter season, the authors have analyzed the dam cracking site and the cracking mechanism. Pointed out that the early autogenous volume deformation and temperature difference between inside and outside of the bedding concrete and the temperature difference of basis concrete are the main reasons resulted in the crack...
OBJECTIVE: A quantitative effect of the hypothermia treatment was made on the cranial-cavity deformation with the increasing intracranial pressure (ICP). METHORDS: Finite element software-ANSYS was used to construct a human cranial cavity model, and simulate the deformations with and without hypothermia treatment. RESULTS: The deformation of the cranial-cavity model with hypothermia treatment is 0...
In this paper, a kind of shape memory alloy (SMA) model based on multivariate statistical analysis was developed and applied in studying the vibration characteristic of SMA intravascular stent in blood stream field. Hysteretic nonlinear theory was introduced to interpret the difference between loading and unloading curve of SMA. Multivariate statistical analysis method was applied in finding the relationship...
Monitoring intracranial pressure (ICP) is crucial in the study of neurosurgical disorders. In the present study, we propose a new minitraumatic method for monitoring ICP with strain-electrometric technology in rats. Strain foils were placed on the exterior surface of parietal skull to record the strains of skull bone. A small incision was made on the skin in the rat's head and the area is shaved for...
The biodegradation of Daqing crude oil in seawater was studied by petroleum-degrading Zoogloea sp. strain SY1 isolated from soil. The results showed its biodegradation rate was 44.5% without nutrients. SY1 can adapt to NaCl concentration, temperature, pH, and dissolved oxygen in the seawater. Biodegradation rate was improved by appending nitrogen and phosphorus. Phosphorus, pH, NaCl, and nitrogen...
A strain JM-1 producing biodemulsifier with high efficiency was isolated from cold rolling plant emulsion wastewater untreated. The experimental results proved that demulsification rate of JM-1 culture broth achieved 97.1%, oil removal rate 97.38% with 8 h in room temperature. The strain JM-1 was identified as Candida tropicalis based on physiological and biochemical characteristics, 26SrDNA sequence...
In this paper, a kind of shape memory alloy (SMA) model based on multivariate statistical analysis was developed and applied in vibration control on rotor system with SMA bearing. Hysteretic nonlinear theory was introduced to interpret the difference between loading and unloading curve of SMA. Stepwise multiple regression method was applied in finding the relationship among strain, stress and temperature...
In this paper, a kind of shape memory alloy (SMA) model based on hysteretic nonlinear theory and data mining was developed and applied in vibration control on rotor system with SMA bearing. Nonlinear difference item was introduced to interpret the hysteretic phenomenon of SMA. Arctangent function was introduced to describe the variation of SMA stiffness with temperature. Based on above, all of possible...
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