In NSC KIPT, Kharkov, Ukraine a neutron source based on a subcritical assembly driven by a 100MeV/100kW electron linear accelerator will be constructed. This neutron source is an USA (ANL)- Ukraine (KIPT) Joint projec...
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ISBN:
(纸本)9783954501229
In NSC KIPT, Kharkov, Ukraine a neutron source based on a subcritical assembly driven by a 100MeV/100kW electron linear accelerator will be constructed. This neutron source is an USA (ANL)- Ukraine (KIPT) Joint project, and its accelerator will be designed and constructed by Institute of High Energy Physics (IHEP), China. The design and construction of such an accelerator with high average beam current and low beam power losses is a technical challenging task. In the paper, the main accelerator features and current status are under discussion.
This paper presents a unified slip model for axial, radial, and mixed-flow impellers. The core assumption of the model is that the flow deviation or the slip velocity at the impeller exit is mainly originated from the...
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This paper presents a unified slip model for axial, radial, and mixed-flow impellers. The core assumption of the model is that the flow deviation or the slip velocity at the impeller exit is mainly originated from the blade loading near the discharge of an impeller and its subsequent relative eddy in the impeller passage. The blade loading is estimated and then used to derive the slip velocity using Stodola's assumption. The final form of the slip factor model can be successfully related to Carter's rule for axial impellers and Stodola's slip model for radial impellers, making the case for this model applicable to axial, radial, and mixed-flow impellers. Unlike conventional slip factor models for radial impellers, the new slip model suggests that the flow coefficient at the impeller exit is an important variable for the slip factor when there is significant blade turning at the impeller discharge. This explains the interesting off-design trends for slip factor observed from experiments, such as the rise of the slip factor with flow coefficient in the Eckardt A impeller. Extensive validation results for this new model are presented in this paper. Several cases are studied in detail to demonstrate how this new model can capture the slip factor variation at the off-design conditions. Furthermore, a large number of test data from more than 90 different compressors, pumps, and blowers were collected. Most cases are radial impellers, but a few axial impellers are also included. The test data and model predictions of the slip factor are compared at both design and off-design flow conditions. In total, over 1650 different flow conditions are evaluated. The unified model shows a clear advantage over the traditional slip factor correlations, such as the Busemann-Wiesner model, when off-design conditions are considered. [DOI: 10.1115/1.4003022]
Although the protective mechanisms of delayed ischemic preconditioning have received extensive studies, few have addressed the mechanisms associated with rapid ischemic preconditioning. We investigated whether ischemi...
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Although the protective mechanisms of delayed ischemic preconditioning have received extensive studies, few have addressed the mechanisms associated with rapid ischemic preconditioning. We investigated whether ischemic tolerance induced by rapid preconditioning is regulated by the Akt survival signaling pathway. Stroke was generated by permanent occlusion of the left distal middle cerebral artery plus 30 min or 1 h occlusion of the bilateral common carotid artery (CCA) in male rats. Rapid preconditioning performed 1 h before stroke onset reduced infarct size by 69% in rats with 30 min CCA occlusion, but by only 19% with 1 h occlusion. After control ischemia with 30 min CCA occlusion, Western blot showed that P-Akt was transiently increased while Akt kinase assay showed that Akt activity was decreased. Although preconditioning did not change P-Akt levels at 1 and 5 h compared with control ischemia, it attenuated reduction in Akt activity at 5 h in the penumbra. However, preconditioning did not change the levels of P-PDK1, P-PTEN, and P-GSK3 beta in the Akt pathway, all of which were decreased after stroke. At last, the PI3K kinase inhibitor, LY294002, completely reversed the protection from ischemic preconditioning. In conclusion, Akt contributes to the protection of rapid preconditioning against stroke.
The design parameters and the operational aspects of mine water disposal project in Fengxi Xinyu coal mine were introduced. The primary disposal process included neutralization, coagulation settling and mechanical fil...
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ISBN:
(纸本)9783860090664
The design parameters and the operational aspects of mine water disposal project in Fengxi Xinyu coal mine were introduced. The primary disposal process included neutralization, coagulation settling and mechanical filtration process, and reverse osmosis (RO) process for desalination were used to treat mine water with high-turbidity, high-hardness and high-salinity. The results showed that the pretreated mine water could be used for washing coal, and the quality of permeate liquid of RO for water with milk excelled the national standards for drinking water. New water source was supplied to the coal mine, the recycle of mine water was resource engineering practice.
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