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BiFeO3复合薄膜结构分析与生长模型
Structure Analysis and Growth Pattern of BiFeO3 Composite Film
 [PDF]

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Applied Physics (APP) , 2013, DOI: 10.12677/APP.2013.32008
Abstract:

本文采用脉冲激光沉积法(PLD)制备了(BiFeO3)0.5:(Sm2O3)0.5/SrTiO3(011)复合薄膜,采用X射线衍射仪(XRD)、能量色散X射线光谱仪(EDX)、X射线φ扫描(XRD phi-scan)和透射电子显微镜(TEM)测试分析了复合薄膜的取向关系、组分、微结构以及界面。并通过“润湿模型”原理结合能量最小化原理推测出了复合薄膜的可能生长结构,发现理论与实验结果相吻合。说明该“润湿模型”可以用来有效的分析讨论复合薄膜的微结构和生长机理。
A (BiFeO3)0.5:(Sm2O3)0.5/SrTiO3(011) composite film has been made by pulsed laser deposition (PLD). Various methods, such as x-ray diffractometer (XRD), energy dispersive x-ray spectroscopy (EDX), x-ray diffraction phi-scan (XRD phi-scan) and transmission electron microscopy (TEM), were used to measure and analyze the orientation relationship, composition, microstructure and interface of the composite film. A possible growth pattern of the film has been speculated by the theory of Wetting Model and Energy Minimization Principle. Analysis shows that the growth pattern is in coincidence with the practical results. The conclusion is that the Wetting Model can be applied to analyze and discuss the microstructure and growth mechanism of composite films.



晚清政治现代化的路径选择及其历史启示—以清末宪政改革为例
The Path Selection of Political Modernization and Its Historical Enlightenment in Late Qing Dynasty—The Case of Constitutional Reform in the Late Qing
 [PDF]


Open Journal of Historical Studies (OJHS) , 2014, DOI: 10.12677/OJHS.2014.24007
Abstract:
20世纪初,为了维系摇摇欲坠的封建专制统治,清政府立足中国政治传统,放眼世界政治发展潮,将政治革新看成是挽救封建政治体系和实现救亡图存的最后一根救命稻草。在1905年推进的宪政改革中,清政府通过考察立宪政治、颁布宪政法令、设置立宪机构、推动地方自治等措施对封建专制政治体系进行了较为全面地调整,希望能在中国确立起君主立宪制。这次在中国政治发展史上具有重要历史意义的政治改革虽然以失败告终,但它极大地撬动了封建专制政治体系,不仅使中国传统政治文化沐浴到了新鲜之气,而且还大大地推动了中国早期政治现代化的步伐。
At the beginning of the twentieth century, the Qing government, based on Chinese political tradition, taking a broad view of the trend of world development, regarded the constitutional politics as the last life-saving straw to achieve the salvation and continue the feudal rule. In the political revolution movement in 1905, the Qing government made a whole adjustment to the feudal autocratic political system by observing the constitutional politics, issuing the constitutional decree, setting constitutional institutions, and encouraging local autonomy, and they hoped to establish a consti-tutional monarchy in China. The superincumbent reform failed, however, it greatly leveraged the feudal autocratic political system, and it not only brought fresh air to the Chinese traditional politics and culture, but also further promoted the process of the early political modernization of China.
创业企业家的最优消费与投资
Optimal Consumption and Investment for an Entrepreneur
 [PDF]

金强,
Finance (FIN) , 2011, DOI: 10.12677/fin.2011.11001
Abstract: 本文考虑一个面临随机需求风险的创业企业家,如何通过消费平滑策略与动态调整企业规模,实现效用最大化的公司金融问题。运用动态随机控制方法,得到了风险厌恶下企业资本的平均价值与边际价值的半闭式解及相应的最优消费与投资策略。数值结果表明,创业企业家的风险态度对企业资本的边际价值与平均价值以及相应的最优消费与投资决策具有显著的影响。
This paper considers an optimal investment problem for a risk-averse entrepreneur facing stochastic demands to maximize the expectation of total consumption utility through consumption and business investment with costly reversibility. Utilizing dynamic stochastic control, we derive semi-closed-form solutions for the average value and marginal value of the capital and the corresponding optimal consumption and investment strategies in a non-risk-neutral world. The numeric results show that the risk attitude of the entrepreneur has a significant effect on the value of the capital and the optimal consumption strategy and investment decision.
取代基对苯基格氏试剂电解液电化学性能的影响
Effect of Substituent Groups in Phenyl Grignard Reagent Electrolytes on Electrochemical Performance
 [PDF]

郭永胜, 张帆,
Journal of Advances in Physical Chemistry (JAPC) , 2013, DOI: 10.12677/JAPC.2013.22002
Abstract:
镁能够在格氏试剂RMgX(R为烷基和苯基等,X为卤素)的醚溶液中实现可逆沉积–溶出,然而,对于不同取代基对格氏试剂电解液的电化学性能影响却很少有人研究。在本文中,我们合成了一系列氟或甲基在不同位置取代的苯基格氏试剂电解液,并研究了他们的电化学性能。结果表明,苯环上不同位置被氟或甲基取代对苯基格氏试剂电解液的镁沉积–溶出可逆性和电化学稳定窗口有显著影响。这些发现为开发新的可充镁电池电解液体系打下了基础。
Mg can be reversibly deposited from ethereal solutions of Grignard salts of the RMgX type (R = alkyl, aryl groups and X = Cl, Br etc.). However, effect of different substituent groups on the electrochemical properties of Grig-nard electrolyte is rarely studied. In this paper, we synthesized a series of phenyl Grignard reagents with substituent groups in different positions and investigated their electrochemical performance. The results show that the Mg deposi-tion/dissolution reversibility and electrochemically stable window of the phenyl Grignard reagent electrolytes are greatly influenced by fluorine or methyl group in different positions on the phenyl ring. These findings pave the way to develop new electrolyte systems for rechargeable magnesium battery.
一种基于门限的排序算法及其在OFDM中的应用
A Sorting Algorithm Based on Threshold and Its Application in OFDM
 [PDF]

何伟,, 鸿文
Hans Journal of Wireless Communications (HJWC) , 2013, DOI: 10.12677/HJWC.2013.36020
Abstract: 着科技的飞速发展,排序算法不再仅限于计算机领域,越来越来多优异的排序算法开始应用于无线通信领域。OFDM需要选择信道条件好的子载波进行数据传输。传统方法是利用冒泡排序、插入排序等算法提取出最好的n个信道,其缺点是复杂度高。本文提出一种基于门限的排序算法,通过自适应门限的方式设定好一个门限取出比门限大的元素。所提方法能显著降低复杂度。通过对不同的数据样本进行仿真比较,证明所提方法能较好地接近理想排序。特别在用于OFDM子载波选择时,信道容量性能非常接近
With the rapid development of technology, sort algorithm is not limited in computer areas any longer. More and more outstanding sort algorithm begins to be applied in wireless communications. OFDM needs to select good subcarrier channel conditions for data transmission. Traditional sort methods, including bubble sort and insertion sort, aim to find n best channels. Its disadvantage is that the complexity is high. This paper proposed a sorting algorithm based on threshold which sets a threshold by means of adaptive threshold and get elements that are better than the threshold. The proposed method can significantly reduce the complexity. The simulation results based on different data sample can prove that the proposed method can be better close to the ideal sort. Especially when used in OFDM sub- carrier selection, channel
用C语言实现在GRAPHTOOL中使用汉字

计算机系统应用 , 1995,
Abstract: GRAPHTOOL是一个用于高级图形分析的功能强大的二、三维图形处理软件,它具有集成的处理和表达方式,可以处理13种基本图形和26种图形类型,并允许对任一种图形进行数据分析和元素编辑,可供要求高级图形分析的用户使用。在GRAPHTOOL的图形编辑过程中,一般需要添沃加注解(如标题、轴标号等说明性文字),用以说明该图形的名称和用途,尤其是当一个图形文件中含有多个图形时,必须使用注解来区分不同的数据。但是洞大多数西文软件一样,GRAPHT00L不支持汉字的显示,只能添加西文注解。笔者在使用该软件的过程中,发现其中的散布…
含两类耐药基因逆转录病毒载体的构建及在人脐血CD34+细胞中的表达

科学通报 , 2000,
Abstract: 将耐药谱截然不同的3种耐药基因(mdrl,mgmt,dhfr)两两组合,以逆转录病毒介导在人脐血CD34^+细胞中表达,增强了细菌对相应两种不同类型化疗药物的抗性,使造血细胞受到多重保护,为研究肿瘤化疗中如何更大程度地保证正常组织,降低药物毒副作用,提高治疗效果提供实验基础。
谈谈“左手材料”

现代物理知识 , 2006,
Abstract: “左手材料”(left-handed materials)是指在一定的频段下同时具有负的磁导率和负的介电常数的材料。电磁波在这种材料中的传播特性与在一般材料中相比有很大的不同,比如光在左手材料中的行进方向与能量传播的方向相反、完全相反的折射定律等等,“左手材料”颠覆了一般材料中所
超导电性的研究及应用

现代物理知识 , 2004,
Abstract: 1911年 ,荷兰莱顿大学的卡茂林 -昂尼斯 (H .Kamerlingh Onnes)在实验中发现将汞冷却到绝对温度4 .2K时 (- 2 6 8.98℃ ,绝对温度零度相当于零下 2 73摄氏度 )其电阻突然消失并由此开始了超导研究 ,昂尼斯称这种处于超导状态的导体为超导体。昂尼斯也凭这一发现获得了 1913年的诺贝尔物理学奖。一、超导体的特性和分类超导体电阻突然变为零的温度叫超导临界温度(TC)。目前已经发现的一半的金属元素和成百上千种合金与化合物都是超导体 ,但是他们的转变温度TC 都较低。直到 2 0世纪 80年代中期TC 也未能突破 30K大关 ,人们把此类超导体…
混合物流动沸腾传热研究

化工学报 , 1998,
Abstract:
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