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Search Results: 1 - 10 of 403010 matches for " 王涵杨 "
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优化的协同过滤推荐算法
Optimized Cooperative Filtering Algorithm
 [PDF]

马瑞新, 孟繁成,
Computer Science and Application (CSA) , 2011, DOI: 10.12677/csa.2011.13022
Abstract: 基于最近邻的协同过滤算法是个性化推荐中应用的最为成功的算法,然而在普通网络中,用户身份兴趣等信息缺乏可靠性,导致该算法推荐不够精确。社会网络是彼此拥有足够的感情后建立起来的一种人际关系网络,它的出现为广大用户提供了一个相对安全的绿色交流通道。本文针对社会网络中个性化推荐系统存在的问题,提出了一种在社会网络下基于信任度的最近邻居集合算法的优化,该算法通过分析社会网络中用户的信任度给出个性化推荐。实验表明,该算法在社会网络中的应用提高了个性化推荐的准确度,增加了用户的满意程度。
Cooperative Filtering algorithm is one of the most successful technologies in the application of personalized recommendation system. However, the users’ identities and interests are very complicated in the normal network, which results in the inaccuracy of the recommendation. However, the appearance of social network provides users with a relatively green and safe communication platform. This paper in terms of the problems in the personalized recommendation system of social network comes up with the trust-based nearest neighbor algorithm which optimizes the traditional NN algorithm and provides recommendation by analyzing trust between the social network users. The experimental results show that the modified algorithm greatly improves the recommendation accuracy and raises the users’ degree of satisfaction.
原油和干酪根热演变下限模拟实验在研究高变质地区中的应用
天宇,
天然气工业 , 1984,
Abstract: ?本文通过原油和干酪根的热模拟实验,探讨了热演化过程及烃类裂解的最终反应.对气体产物的体积和组分作了测定和分析,对烃类在热作用下两极分化产生氢,而在一般天然气中却含氢较少的原因作出解释.根据演化程度及保存条件,讨论了含氧异常的情况,并列举了天然气井中含氧异常的实例.最后,结合高变质有机质碳酸盐岩地区的岩石中固体沥清反射率和镜质体反射率romax,讨论了高变质地区存在天然气藏的可能性.
油型气和煤成气判别指标的探索
,天宇
天然气工业 , 1987,
Abstract: ?本文在模拟实验的基础上,探讨了煤成气和油型气甲烷碳、氮同位素组成和气体组特征,总结了判别煤成气和油型气指标及其在不同成熟度条件下变化的规律。
原油热解成气模拟实验
,天宇
天然气工业 , 1982,
Abstract: ?本文论述了用四川盆地侏罗纪原油,在350~600℃温度模拟实验条件下,热变成气规律以及不同温度下形成气体的组份特征.进一步验证了埋藏在储集层中的原油随着温度而演化,最后生成甲烷这一事实.同时测出一定原油量与受热演化生气量的关系.当实验温度为600℃时,原油全部热解成甲烷、氢气和残碳.实测结果,在该温度,1吨原油可演化成600米3左右纯甲烷和100米3氢气,认为该参数对于过成熟地区,计算生气量具有一定意义.
社会网络经济案例研究与分析
Research and Analysis of Economic Case Based on Social Network
 [PDF]

马瑞新, 孟繁成, 陈鹏, , 崔亚杰
Modern Marketing (MOM) , 2011, DOI: 10.12677/mom.2011.13010
Abstract: 随着经济全球化和网络化的发展,经济体系中的社会资本逐渐成为限制企业发展和进步的首要因素。本文针对经济社会中存在的关系结构进行分析和研究,指出社会网络分析在经济决策和选择中的重要地位。以消息传播为例,阐释了社会网络中的关键节点在创新推广、企业改革中的重要作用。深入研究经济体系中的社会网络,充分利用经济环境中的不完全信息建立相对完整的关系结构作为企业的决策基础,可以有效地推动企业的发展和进步。
With the development of economic globalization and networking, social capital is becoming the most important element during the course of company growth and progress in economic system. This paper analy- zed and studied the relation structures in economic social-networks, raises the point that social network analy- sis plays a very important role in the procedure of economic decision-making and choosing. Take example of news traveling to illustrate the center nodes’ non-ignorable effects in innovation diffusion and in enterprise re- form. This paper explains that go into the economic social-network analysis is good for us to take advantage of the incomplete information to build a relatively complete relation network as the foundation of economic de- cision-making, which can effectively promote the companies development.
1990—2010年新疆额尔齐斯河流域湿地景观动态变化
,陈学刚,亚奇
干旱区研究 , 2013,
Abstract: 利用1990年、2000年、2010年3期TM遥感影像,运用GIS和FRAGSTATS景观分析软件,从景观和斑块尺度上分析了1990—2010年新疆额尔齐斯河流域湿地景观格局变化的整体特征和空间异质性。结果表明从1990—2010年各类湿地型景观斑块数持续增加,斑块形状趋于不规则化,整体景观趋于破碎化。湿地总面积呈增加趋势,这主要与20世纪80年代以来该流域降水量的增加有关。湿地空间分布上的破碎化主要是人类活动影响的结果。总之,湿地斑块破碎化严重、空间异质性增强,受人类活动的影响随着时间的推移越来越大。
骨活素基因转染的兔骨髓基质干细胞复合多孔丝素蛋白支架体外构建组织工程骨
Construction of Tissue Engineering Bone with Osteoactivin Gene Transfected Rabbit Bone Marrow Stromal Cells and Porous Silk Fibroin Scaffold in Vitro
 [PDF]

, 征毅, 程峰, 潘广嗣, 易晓辉, 孙晋, 曹依娜, 袁林
Advances in Clinical Medicine (ACM) , 2014, DOI: 10.12677/ACM.2014.42006
Abstract:

目的:用腺病毒表达载体将骨活素基因转染到兔骨髓基质干细(BMSCs),复合多孔丝素蛋白支架体外构建组织工程骨。方法:用表达骨活素基因的腺病毒载体转染体外培养的兔BMSC,免疫组化、原位杂交染色和蛋白印迹方法检测细胞骨活素的表达,并通过流式细胞仪和ALP活性检测分析其对细胞增殖、分化的影响。然后将转染后细胞接种到多孔丝素蛋白支架上,扫描电镜观察细胞贴附、生长状况。结果:转染后,骨活素基因在mRNA水平和蛋白水平均有表达;S期细胞比例和ALP活性明显增高。扫描电镜见转染细胞分布均匀,伸展良好。结论骨活素基因可高效转染兔BMSC,且促进细胞增殖及成骨转化。转染后细胞在多孔丝素蛋白支架上生长良好,骨活素基因治疗的组织工程骨构建成功。
Objective: Rabbit bone marrow stromal cells (BMSCs) infected by a recombinant adenoviral vector carrying the osteoactivin gene (Ad-OA) were seeded into porous silk fibroin scaffold to construct tissue engineering bone in vitro. Method: Ad-OA infected RBM SC cultured in vitro and the expression of OA in these cells after infection were determined by in situ hybridization and immune ohistochemical analysis. OA productions were confirmed by western blot analysis of the supernatant collected from the cells. The changes of cellular proliferation and differentiation in the cells were observed by flowcytometry and ALP activity analysis. OA transduced cells were then seeded into porous silk fibroin scaffolds. The attachment and growth of the cells on the scaffold were examined using SEM. Results: The expression of OA was confirmed in mRNA and protein levels in the cells after infection and the presence of OA was detected in the supernatant of the cells. In addition, cellular proportion in S period and ALP activity obviously increased in the cells. SEM examination revealed extensive cellular attachment and growth on the porous silk fibroin scaffolds composite in 1 day. Conclusion: Ad-OA could infect RBMSC with high efficiency and promote cellular proliferation and osteoblast conversion. The cells after infection grew well on a porous silk fibroin scaffold. Tissue engineering bone used to regional gene therapy is constructed successfully.

基于等效剩磁法的永磁电动机转子偏心磁场解析计算
张冉,秀和,玉波,王道
电工技术学报 , 2009,
Abstract: 转子偏心对永磁电动机的性能有较大的影响。本文基于等效剩磁的方法,利用永磁电动机中标量磁位所满足的微分方程和场量所满足的边界条件提出了静态偏心气隙永磁电动机磁场的解析计算方法。采用该方法计算了一台转子静态偏心的永磁无刷直流电动机在不同偏心率时不同半径处的气隙磁场分布,与有限元计算结果进行了对比,结果表明该方法具有较高的准确性,并得出了相应的结论。
基于水火电置换的发电权调节市场
雁凌,张粒子,
中国电机工程学报 , 2006,
Abstract: 在遵循国家能源政策,充分有效利用水资源的前提下,引入市场机制的调节作用,在合约市场、月度市场和日前市场的基础上,建立基于水火电置换的发电权调节市场,设定了发电权转让价格的上下限值。文中设计三种发电权交易的类型:月间发电权交易、日间发电权交易和小时发电权交易,并建立置换电量在发电权交易主体中的优化分配模型,应用线性规划法进行求解。算例表明该模型简单实用,能够较好地兼顾国家能源政策和市场机制的调节作用两方面的因素,在我国电力市场改革的初级阶段具有一定的实用性。
卵砾石边坡坡脚泥沙起动试验研究
胜发,,周华君
重庆交通大学学报(自然科学版) , 2009, DOI: 10.3969/j.issn.1674-0696.2009.02.19
Abstract: :?针对山区河流枯水卵石急滩的泥沙输移特点,通过对斜坡上卵砾石的实验现象观察和理论分析,发现卵砾石边坡坡脚处的泥沙首先起动。根据卵砾石边坡坡脚泥沙的受力状态,采用滚动模式进行理论推导,考虑了底部流速、阻力系数、卵砾石水下重力及其附加重力的影响,推导出了卵砾石边坡坡脚泥沙的起动流速公式,该公式与边坡坡度有关。通过水槽试验,拟合出卵砾石边坡坡脚泥沙的起动公式,并与沙莫夫公式进行了比较。
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