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 algorithm presented here is used on unmanned aerial vehicles system. In 2013,*** proposed a matching cost computation model(or function), This matching cost model combined three kinds of constraints, the cost func...
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ISBN:
(纸本)9781479953905
The algorithm presented here is used on unmanned aerial vehicles system. In 2013,*** proposed a matching cost computation model(or function), This matching cost model combined three kinds of constraints, the cost function is formulated by combining three individual costs: a cost computed on an extended census transformation of the images;the absolute difference cost, taking into account information from colour channels;and a cost based on the principal image derivatives. Experiments show that the cost function is excellent performance in similar estimates. Apply it to the stereo matching of ancient buildings, it is favorable for practical. However, this experiment, in color mutated region, leaded to blurred border. Therefore, our proposed method added color space structural information, which based on HVS Weber's law, to the cost function. we use the differential excitation of WLD reflects the structure of color space. This robust cost measures can reduce percent of bad pixels in mutated color region. The proposed method use color image, which is used after epipolar line rectification.
Synergetic effects in Au-Ag bimetallic nanoclusters (BNCs) more favorably enhanced electrochemical redox induced electrochemiluminescence (ECL) over photoexcitation induced photoluminescence (PL); this not only led to...
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Synergetic effects in Au-Ag bimetallic nanoclusters (BNCs) more favorably enhanced electrochemical redox induced electrochemiluminescence (ECL) over photoexcitation induced photoluminescence (PL); this not only led to Au-Ag BNCs with enhanced bandgap-engineered ECL compared to Au NCs, but it also generated surface-defect related ECL to enhance the total ECL intensity.
China's electricity market is now still in the mode of "Unified market and two-tier operation" including provincial and inter-provincial market. The inter-provincial market is divided into the medium and...
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China's electricity market is now still in the mode of "Unified market and two-tier operation" including provincial and inter-provincial market. The inter-provincial market is divided into the medium and long-term market and spot market. This study takes the inter provincial spot market as the research object, and proposes a unified optimization clearing algorithm for inter provincial spot market considering path constraints. The proposed method is able to handle AC-DC hybrid electricity network, and sort and determine the trading pairs using power flow tracing algorithm. The power market software PLEXOS and practical market data are used to simulate the proposed model, and the results show the accuracy and effectiveness.
The fruits of Citrus are popular all over the world. It was reported that the extracts of fruits possessed antiallergic activities. In China, Citri Reticulatae Pericarpium (CRP) is a production of peels. In this study...
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The fruits of Citrus are popular all over the world. It was reported that the extracts of fruits possessed antiallergic activities. In China, Citri Reticulatae Pericarpium (CRP) is a production of peels. In this study, flavonoids were extracted by solvent method, and enriched by polyamide. Then antiallergic activity of flavonoids was investigated in vivo and in vitro. Under optimal parameters, most abundant compounds of extracts were hesperidin and narirutin, their contents were 232.0325 and 98.7946 mg/g, respectively. In vitro, RBL-2H3 cell line was used to investigate the antiallergic activity. As the results shown, -hexosaminidase release of antigen-induced degranulation was decreased by flavonoids. An ovalbumin-induced allergic asthmatic model was used to test the activity of the flavonoids in vivo. After treated with different concentrations of flavonoids, the levels of IgE, IL-4, and IL-13 decreased significantly. These findings provide evidence that flavonoids extracted from CRP have potential using in antiallergic therapeutic area. Practical applicationsOranges are popular all over the world as fruit, besides a little percent of peels are applied as traditional medicine in China, the others are thrown away as rubbish. To explore the new way to extend the application of peels, we extracted the total flavonoids from Citri Reticulatae Pericarpium (CRP) and evaluated the antiallergic activity of it. Fortunately, the total flavonoids have antiallergic activity in vitro and vivo. The findings provide evidence that extracts from CRP have potential using in antiallergic therapeutic area. It can also afford a theoretical basis for the new application of orange peel.
Person re-identification is a technique to automatically search the same people in diffe..ent camera views. It is a challenging task because of the huge variations caused by different illuminations and views in images...
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ISBN:
(纸本)9781538665657
Person re-identification is a technique to automatically search the same people in diffe..ent camera views. It is a challenging task because of the huge variations caused by different illuminations and views in images. There is an effective method tackling the problem, which learns a useful feature representation for the pedestrian images, In recent research, a featu..e rep..esentation named Local Maximal Occurrence (LOMO) achieves outstanding performance, but LOMO has a disadvantage that its robustness to illumination is not excellent. In this pape.., we propose an imp..oved LOMO representation to further reduce the impact of light. The improved LOMO feature combines Color Name feature with LOMO, because Color Name feature has strong robustness to illumination. However, Color Name feature has the weakness that it loses graphical details. The..efore, the feature is unsuitable for traditional pooling method. To overcome the disadvantage, a specific pooling method called global Gaussian pooling for Color Name feature is designed, which is based on Gaussian distribution and can weigh the different regions of an image. The important regions gain mo..e attention in matching images. The experimental results on two public available datasets demonstrate the effectiveness of our proposed approach.
Instantaneous undeformed chip thickness (IUCT) plays a critical role in optimizing and monitoring of five-axis milling processes, as it determines machining precision and tool life by affecting cutting forces. Analyti...
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Instantaneous undeformed chip thickness (IUCT) plays a critical role in optimizing and monitoring of five-axis milling processes, as it determines machining precision and tool life by affecting cutting forces. Analytical and numerical methods have been widely used for IUCT calculation. However, these methods have some deficiencies, such as solving the unsolvable transcendental equations, modeling the complex cutting edge trajectory, and poor adaptability for five-axis milling. Therefore, a Boolean method which consists of subtraction and intersection operations is developed. First, the blank for the current cutting edge is obtained by the Boolean subtraction operation between the workpiece and the swept volume that produced by the front cutting edges. Second, the Boolean intersection operation is executed between the blank and the auxiliary edge entity (AEE) that corresponding to the tool edge. Then, the IUCT of each cutting edge or each cutting point can be deduced based on the Boolean result with the known blank geometry, tool geometry, tool path, and machining parameters. The method is verified by milling force experiments. It is an efficient, accurate, and general method because it does not need to establish complex mathematical or numerical models. The calculated IUCT will promote the optimizing and monitoring of five-axis milling processes.
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