The relationship between group adoption of Knowledge Building Principles and performance in creating artifacts

Educational technology research and development - Knowledge Building is a socio-constructivist approach that aims to engage students in a knowledge-creation environment as early as possible to get...     

发挥文化资源优势加快发展黄石文化产业

在建设全面小康社会与构建社会主义和谐社会的进程中,繁荣和发展社会主义先进文化十分重要.黄石要大力发展社会主义先进文化,加快建设文化强市,必须把深厚的文化资源优势转化为促进跨越发展的动力源,努力把黄石建设成为文化设施好、文化企业多、文化产品精、文化机制活的全省文化强市.     

我国中小企业技术创新模式的选择:智猪博弈

企业要在日益激烈的竞争环境中发展,技术创新是必不可少的。但不同的企业应该根据自己的实际情况,选择不同的技术创新模式。从博弈论中的\"智猪博弈\"模型出发,在分析现阶段我国中小企业与大企业相比技术创新劣势的基础上,根据中小企业特点,得出在技术创新中中小企业应采取模仿创新的模式。     

R&D型动态联盟的模块化与项目式集成管理研究

R&D型动态联盟是一种高度柔性化的模块化组织,这种合作型研发组织通过对合作企业核心能力和资源的整合,降低了研发成本,缩短了研发周期,提高了研发竞争力.将R&D型联盟中的合作企业按功能进行模块化分解,并将各个功能模块转化为项目活动,以实现对R&D型动态联盟的项目式集成管理,并运用网络优化原理对R&D型动态联盟各模块的进度进行优化,为最优工期的确定提供有效方法.     

APL-based flexibility analysis of manufacturing grid

With the characteristics of diversity, randomness, concurrency and decomposability, tasks in manufacturing field are very complicated, and so manufacturing grid(MG)should have considerable flexibility to deal with this problem. With the definition of node and arc, MG structure is converted into a small-world network. Given construction cost constraint, the problem of shortest task waiting time is transformed into the constrained optimization problem, and a corresponding flexibility analysis model based on average path length(APL)is proposed, and the premise of arc-length and node-distance are defined. The results of application example show that the analysis model is effective.     

试论体育专业教学评价的时代特征

教学评价是教学活动中的重要环节。随着教育教学思想、观念的更新 ,体育教学的指导思想、目标的发展与变化 ,体育教学评价的时代性特征表现为 :评价内容的全面性、评价指标的层次性、评价对象的整体性、评价目的的发展性、评价方式的综合性和评价结果的导航性。     

论高职院校的“大学意识”

高等教育是高职教育的普遍性,职业技术教育是高职教育的特殊性,普遍性的核心要素是“大学意识”。为促进高级技能型人才科学的培养,使未来劳动者的知识、技能与人品结构平衡发展,高职院校有必要树立大学意识。大学意识是培养人追求真理,独立思考能力;是培养、塑造人的“有容乃大”的精神;是衡定孵化社会人的职能。高职的大学意识有其特殊性,重点在于环境陶冶、言传身教和厚德载物。     

<Emphasis Type=Italic>Agrobacterium</Emphasis>-mediated transformation of herbicide resistance in creeping bentgrass and colonial bentgrass

Embryogenic calli were induced from the seeds of creeping bentgrass (Agrostis palustris Huds.) cv. Regent and colonial bentgrass (Agrostis Tenuis Sibth. Fl. Oxen.) cv. Tiger. The embryogenic calli were precultured on fresh medium for 4–7 days and then co-cultivated withAgrobacterium tumefaciens, LBA4404. which contains plasmid vector-pSBGM harboring bar coding region, synthetic green fluorescent protein (sGFP) coding region and matrix attachment region (MAR). After 3 days of co-cultivation, the calli were washed thoroughly and transferred to MS medium containing 2 mg/L of 2, 4-D, 12–15 mg/L phosphinothricin (PPT) and 250 mg/L of cefotaxime. After 2–3 months of selection, the actively growing calli of ‘Regent’ and ‘Tiger’ were transferred to MS medium with 12–15 mg/L PPT and 250 mg/L cefotazime for regeneration. The putative transformants were maintained on MS medium with 3 mg/L PPT for long period but control died within 1 month. After establishing in greenhouse, the transformants also showed strong resistance to 0.4% of herbicide Basta but control plants died within 2 weeks. Under confocal microscope, both young leaves and roots showed significant GFP expression. PCR analysis revealed the presence of a DNA fragment of GFP gene at the expected size (380 bp) in the transformants and its absence in a randomly selected control plant.     

重视铅球教学 完善铅球教法

揭示铅球教学在中学体育中的重要性,并提出通过改进和完善铅球教法来提高学生的素质,提高学生的铅球成绩     

Danshen protects endothelial progenitor cells from oxidized low-density lipoprotein induced impairment

In this study,we examined the protective effects of Danshen both on endothelial progenitor cells(EPCs) in patients with hypercholesterolemia and on in-vitro EPCs of healthy volunteers.In the clinical study,we randomly divided 24 subjects with hypercholesterolemia into two groups(the control group and the Danshen-treated group).At the end of two weeks of treatment,the EPC cellular functions of both groups were tested.The results indicated that,compared to the control group,EPCs in the Danshen-treated group showed significantly better cellular functions,which was manifested in the cloning number,the proliferation capacity,the number of EPC adhesions,and cell migration.In the subsequent in-vitro experiments,EPCs were treated with vehicle,oxidized low-density lipoprotein(Ox-LDL,100 μg/ml),or Ox-LDL(100 μg/ml) plus different concentrations of Danshen(Danshensu 2,10,or 50 μg/ml,respectively) for 24 h.The results showed that Danshen treatments can prevent the detrimental effects of Ox-LDL on EPC cellular functions measured by proliferation capacity(0.24±0.08,0.37±0.11,0.30±0.04 vs.0.13±0.02,P0.05,P0.01,and P0.01,respectively),and adhesion ability(63.00±11.60,70.00±10.80,85.50±11.41 vs.40.50±6.85,all P0.01).Compared to the group treated with Ox-LDL alone,Danshen treatment significantly decreased the lipid peroxidation end product malondialdehyde(MDA) [(4.34±0.54),(3.98±0.47),(3.46±0.31) vs.(5.57±0.64) nmol/ml,all P0.01],increased the production of superoxide dismutase(SOD) [(29.74±0.71),(31.09±0.83),(30.41±0.65) vs.(14.76±3.99) U/ml,all P0.01],and lowered the expression of interleukin-6(IL-6) [(24.62±7.69),(27.04±3.14),(33.38±18.86) vs.(230.67±33.53) pg/ml,all P0.01] and tumor necrosis factor-α(TNF-α) [(41.72±6.10),(17.02±6.82),(3.73±2.26) vs.(228.71±41.53) pg/ml,all P0.01] in Ox-LDL treated EPCs.These results suggest that Danshen may exert a protective effect through its antioxidant and anti-inflammatory features.