The small-signal stability problem of complex connected DC DPS was studied. Using mathematical induction method, it is proved that the N subsystems cascaded DPS can be seemed as two equivalent subsystems at arbitrary interface as the stability conclusion is the same. But for complex connected DPS which have M sources, it could be equivalent to M sources and one load system instead of two equivalent subsystems and M minor loop gain at M different interfaces should be satisfied Nyquist criterion simultaneously to ensure the DPS's stability.
Sand shrimp (Metapenaeus ensis), shrimp shell, and shrimp meat were inoculated with a three-strain cocktail of Vibrio parahaemolyticus with or without the natural antimicrobial cinnamaldehyde (2.5 mg/ml) and were, then, stored at 4 ∘ C for up to 25 days and 18 inactivation curves were obtained. V. parahaemolyticus were inactivated down to the minimum level of detection (2.48 log CFU/g) on thiosulfate citrate bile salts sucrose agar (TCBS) plates within 7 and 10 days with low and high densities of V. parahaemolyticus inoculation, 4.5 log CFU/g and 8.2 log CFU/g, respectively. With adding cinnamaldehyde, the inactivation process of V. parahaemolyticus with low populations, 4.5 log CFU/g, lasted for only 4 days. Therefore, cinnamaldehyde inactivated cells faster as expected. However, unexpectedly, in shrimp meat cases, cells have much more persistence of over even 25 days before entering the minimum level of detection both with and without cinnamaldehyde treatment. Therefore, a hypothesis was formed that when cells kept in cold environments (4 ∘ C) after several days recovered to up to 10 3 -10 4 CFU/g towards the end of the experiments and with starvation (shell and shrimp studies), cells might render a viable but nonculturable (VBNC) state.
A new 5-degrees-of-freedom hybrid kinematic machine(HKM) consisting of a
4-degrees-of-freedom PTS-based parallel kinematics platform with center constraint branch and a
serial X axis is developed. The will-be-machined workpiece is mounted on the platform and the
spindle movement is driven by the X axis. This new HKM is very different from a conventional
serial-type machine. Therefore, a special algorithm that can transfer the cutter location data
(CL-data) into machine specific NC commands is essential for the applications of the PTS-X based
HKM in real machining of the workpiece with the complicated surface. The workpiece’s location
approach on the platform and the orientation transformation of the moving platform relative to the
machine coordination system are investigated.
A three dimensional model of Multichip Module (MCM) is built with ANSYS. The temperature and thermal stress field distribution are studied. Taking into account the global heat dissipation and the local thermal stress, the effect of structure parameters and material properties on the maximum chip junction temperature and the maximum thermal stress of MCM are studied. The four design parameters are the thickness of the substrate, thermal conductivity of the substrate, thermal conductivity of the thermal grease and convection heat transfer coefficient. This paper gave the method to reduce the temperature, and the results provided an efficient basis for the compromising design of thermal stress, which is benefit for the thermal optimization of MCM.
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