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Taking No. 3 coal in Qinshui Basin as research object, factors such as solid phase of drilling fluid, water sensitivity, stress sensitivity, scaling, capillarity and polymer plugging which maybe damage coal reservoir were researched during coalbed methane drilling. Sample results analyzed show that No. 3 coal reservoir has low porosity and low permeability, high content of clay mineral. Lab evaluation results show water sensitivity, scaling, solid phase invasion of drilling fluid and polymer plugging are factors which induce the coal reservoir damage. Drilling fluid which has suitable salinity, suitable density, anti-scaling, and removable drilling fluid agents can protect coal reservoir from damage during drilling for pinnate horizontal wells. [ABSTRACT FROM AUTHOR]

Objective The purpose of this study was to investigate the correlation of serum oxidative stress with MMPs in rheumatoid patients with carotid atherosclerosis. Methods Ninety-two cases of rheumatoid patients were divided into non-carotid atherosclerosis group (group A, 45 cases) and carotid artery (group B,47 cases),while 40 cases of healthy person were selected as the control group (group C) . MMP-3, MMP-9, TIMP-1, MDA, SOD and GSH were detected. Results There were significant differences in MMP-9 and TIMP-1 between groupsA and C(P < 0.05),and in MMP-3,MMP-9 and TIMP-1 between group B and the other two groups (P < 0.05) . Compared with group C,SOD and GSH in group A have decreased significantly(P < 0.05) . There were significant differences in SOD and GSH between group B and groups A and C,and MDA in group B increased significantly compared with group A(P < 0.05) . SOD showed significant correlations with MMP-9 and TIMP-1(P < 0.05), while no correlation with MMP-3 (P > 0.05) . There were negative correlations of GSH with MMP-3 and MMP-9(P < 0.05),while was significant positive correlation with TIMP-1(P < 0.05) . Conclusion MMPs were closely related to the oxidative stress disorder in rheumatoid patients with carotid atherosclerosis, which promote the incidence of carotid artery atherosclerosis. [ABSTRACT FROM AUTHOR]

Objective To investigate the correlation between carotid atherosclerosis and inflammatory factors in patients with rheumatoid and its clinical significance. Methods 92 patients with rheumatoid were divided into non- carotid atherosclerosis group (group A 45 cases), and carotid artery (group B 47 cases), while 40 cases of healthy people were selected as a control group ( group C) . Serum levels of TNF- a, IL-17, CRP, IMT and ICAM-1, VCAM-1 were detected. Results Serum levels of TNF-α, IL-17 of patients in A group were significantly higher than those in group C (P< 0.05), Serum levels of TNF-α, IL-17, CRP of of patients in group B were significantly different to group A and group C (P < 0.05). Serum levels of IMT, ICAM-1, VCAM-1 of A group were significantly higher than those in group C (P< 0.05), Serum levels of IMT, ICAM-1, VCAM-1 of group B were significantly higher than those in group A and group C (P<0.05) . Serum levels of TNF-α and IMT, ICAM-1, VCAM-1 showed a significant positive correlation (P<0.05), Serum levels of IL-17 and ICAM-1, VCAM-1 showed significant positive correlation (P< 0.05), Serum levels of CRP and IMT, ICAM-1, VCAM-1 showed no significant correlation (P>0.05). Conclusion Inflammatory cytokines and carotid atherosclerosis are closely related, and synergically promote the incidence of carotid artery atherosclerosis. [ABSTRACT FROM AUTHOR]

The change of illumination have a serious effect on pedestrian detection algorithms based on image difference, general adaptive background updating methods is difficult to eliminate the effects of illumination change. This paper proposed a new method of illumination changes elimination based on similarity of histogram distribution to solve this problem. It analyzed similarity of histogram distribution on local area between illumination changed image and normal image. It presented standard deviation of image which could use to measure similarity of histogram distribution. Through image difference experiment between two adjacent frames acquired under light frequency change environment, it shows that the method has a outstanding performance in robustness which can segment the moving targets accurately and restrain the changes of illumination significantly. [ABSTRACT FROM AUTHOR]