运动训练治疗高血压的机制

采用文献资料法从神经内分泌、糖代谢、钠代谢、血流动力学改变等方面论述了运动后即刻和长期运动训练后血压下降的机制,指出运动后血压下降是多种机制参与的结果。     

博客(Blog)及其在图书馆中的应用研究

介绍博客(Blog)的定义、简史、精神和分类，并就博客在图书馆应用的可行性进行探讨，认为博客不仅可以在图书馆应用，而且和图书馆有着天生的共通性。     

《参天台五台山记》中所见的北宋乘轿风俗

《参天台五台山记》所记北宋乘轿风俗,可以纠正过去学者在论及此问题时的片面认识。北宋时在轿子的实际普及过程中,南北方是存在很大差异的。以京城开封为中心的北方地区,尽管乘轿之风日盛,但在相当长时期内受到朝廷禁令的严加约束,官员乘轿更受限制,而同时期的南方地区,乘轿现象已非常普遍,官员乘轿显得极为平常。     

关注生物多样性及生物多样性的保护

地球是太阳系八（或九）大行星中最为璀璨和美丽的星球。地球之美在于生命之美,在于数百万种生物的繁衍生息、协同进化、欣欣向荣所演绎出来的各种生命奇迹。然而,随着人口的急剧增长和人类对自然资源的无节制开发利用,地球上的很多生物正在遭受灭种之灾。据比较保守的估计,全世界每年至少有5万种生物物种灭绝,平均每天灭绝的物种便达140个之多,要不了多久,全世界野生生物物种灭绝的数量将达到其总数的15％～30％,那将是一场十分可怕的灾难!     

“三重融合”模式下校企合作机制探索

校企合作、工学结合是高职院校办学的重点与难点。本文探讨行业型高职院校如何在融合行业办学、融合企业育人、融合生产教学的"三重融合"的办学模式下,通过行业、企业、学校三层次产学合作,建立五方面的校企合作机制和校内改革体系,为工学结合创造良好的条件,形成此类高职院校校企合作的特色。     

Synergistic effects of tea polyphenols and ascorbic acid on human lung adenocarcinoma SPC-A-1 cells

Tea polyphenols have been shown to have anticancer activity in many studies.In the present study,we investigated effects of theaflavin-3-3'-digallate(TF3),one of the major theaflavin monomers in black tea,in combination with ascorbic acid(AA),a reducing agent,and(-)-epigallocatechin-3-gallate(EGCG),the main polyphenol presented in green tea,in combination with AA on cellular viability and cell cycles of the human lung adenocarcinoma SPC-A-1 cells.The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide(MTT) assay showed that the 50% inhibition concentrations(IC50) of TF3,EGCG,and AA on SPC-A-1 cells were 4.78,4.90,and 30.62 μmol/L,respectively.The inhibitory rates of TF3 combined with AA(TF3+AA) and EGCG combined with AA(EGCG+AA) at a molar ratio of 1:6 on SPC-A-1 cells were 54.4% and 45.5%,respectively.Flow cytometry analysis showed that TF3+AA and EGCG+AA obviously increased the cell population in the G0/G1 phase of the SPC-A-1 cell cycle from 53.9% to 62.8% and 60.0%,respectively.TF3-treated cells exhibited 65.3% of the G0/G1 phase at the concentration of its IC50.Therefore,TF3+AA and EGCG+AA had synergistic inhibition effects on the proliferation of SPC-A-1 cells,and significantly held SPC-A-1 cells in G0/G1 phase.The results suggest that the combination of TF3 with AA or EGCG with AA enhances their anticancer activity.     

Quasi-Bayesian software reliability model with small samples

In traditional Bayesian software reliability models, it was assume that all probabilities are precise. In practical applications the parameters of the probability distributions are often under uncertainty due to strong dependence on subjective information of experts’ judgments on sparse statistical data. In this paper, a quasi-Bayesian software reliability model using interval-valued probabilities to clearly quantify experts’ prior beliefs on possible intervals of the parameters of the probability distributions is presented. The model integrates experts’ judgments with statistical data to obtain more convincible assessments of software reliability with small samples. For some actual data sets, the presented model yields better predictions than the Jelinski-Moranda (JM) model using maximum likelihood (ML). Project supported by the National High-Technology Research and Development Program of China (Grant Nos.2006AA01Z187, 2007AA040605)     

Numerical study on effects of door-opening on airflow patterns and dynamic cross-contamination in an ISO class 5 operating room

The contamination diffusion to the operating room when the door is open was simulated with a computational fluid dynamic (CFD) method,to give the extent of the contamination diffusion.The influence of the door-opening procedure was ignored since the door of the operating room is normally a sliding one.The flow field in the case of the 16 s course of opening the door was simulated.The simulated and the experimental results demonstrate that the extent of the contamination diffusion is around 1.5 m when there is no temperature difference between indoor and outdoor,and there is hardly any contamination diffusion when the temperature difference is 1 ℃.It can be concluded that the positive pressure difference in the operating room lost its function in preventing the contamination when the door is open.That the temperature of corridor is lower than that of operating room contributes to contamination control.Keeping 1 ℃ temperature difference between corridor and operating room and increasing positive pressure and air flow are suggested.It is more secure to set up an anteroom if persons come in or out of the operation room at the course of surgery.     

Automatic tracing and segmentation of rat mammary fat pads in MRI image sequences based on cartoon-texture model

The growth patterns of mammary fat pads and glandular tissues inside the fat pads may be related with the risk factors of breast cancer.Quantitative measurements of this relationship are available after segmentation of mammary pads and glandular tissues.Rat fat pads may lose continuity along image sequences or adjoin similar intensity areas like epidermis and subcutaneous regions.A new approach for automatic tracing and segmentation of fat pads in magnetic resonance imaging (MRI) image sequences is presented,which does not require that the number of pads be constant or the spatial location of pads be adjacent among image slices.First,each image is decomposed into cartoon image and texture image based on cartoon-texture model.They will be used as smooth image and feature image for segmentation and for targeting pad seeds,respectively.Then,two-phase direct energy segmentation based on Chan-Vese active contour model is applied to partitioning the cartoon image into a set of regions,from which the pad boundary is traced iteratively from the pad seed.A tracing algorithm based on scanning order is proposed to accurately trace the pad boundary,which effectively removes the epidermis attached to the pad without any post processing as well as solves the problem of over-segmentation of some small holes inside the pad.The experimental results demonstrate the utility of this approach in accurate delineation of various numbers of mammary pads from several sets of MRI images.