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Search Results: 1 - 10 of 180648 matches for " 杨军 "
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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
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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
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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.
日粮蛋白质水平对早期断奶仔猪生产性能的影响
The Influence of Different Protein Level Diet on Production Performance to Early Weaned Piglet
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Hans Journal of Agricultural Sciences (HJAS) , 2015, DOI: 10.12677/HJAS.2015.56031
Abstract:

仔猪早期断奶已成为规模化养殖生产中采取的一项重要手段。早期断奶技术可提高母猪生产性能,也有利于提高仔猪的成活率。饲粮蛋白质是制约早期断奶仔猪生产成绩的主要因素。仔猪适宜的蛋白质水平是保证仔猪健康生长的必要条件。日粮蛋白水平对早期断奶仔猪生产性能有重要影响。由试验结果可知,日粮蛋白质水平在14%~20%的范围内,平均日增重、平均日采食量都逐渐增加,料重比与腹泻率都逐渐降低。在蛋白质为20%条件下,平均日增重与平均日采食量达到最大,料重比与腹泻率都达到最小。蛋白质水平继续升高各指标趋势相反。

Early weaning of piglets has already become an important means of intensive and mass breeding production. Early weaning technique not only may improve the sow production performance, but also improve the survival rates of piglets. Fodder protein is the main restricted factor of early weaned piglets’ production results. An appropriate protein level is the necessary condition to guarantee the health growth of piglets. Different protein level diets have an important influence on production performance of the early weaned piglets. By test results, when the protein level is in 14 percent to 20 percent range, the daily gain and average daily intake are gradually increased. Feed weight ratio and diarrhea rate are gradually reduced. Under the condition of the protein level in 20%, the daily gain and average daily intake achieve the maximum, feed weight ratio and diarrhea rate achieve the minimum. Protein level continues to rise and each index trends to the contrary.

创业企业家的最优消费与投资
Optimal Consumption and Investment for an Entrepreneur
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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
方差相关保费原理下基于VaR和CTE下停止–损失再保险的最优自留额比较研究
The Comparison of Optimal Retention for a Loss-Stop Reinsurance with Variance Related Premium Principles under the VaR and CTE Risk Measures
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, 吴黎
Statistics and Applications (SA) , 2016, DOI: 10.12677/SA.2016.52018
Abstract: 本文对停止–损失再保险模型,给出风险度量VaR和CTE值下最优自留额的存在性及解析解表达式。假设损失总量X服从指数分布,并给定几种不同的保费附加因子,通过数值模拟,比较三种方差相关保费原理下自留额解的存在性。比较得出:在三种方差相关保费原理下,CTE下自留额的存在性均优于VaR。
This paper considers both the existence and the analytical solution expression of optimal retention for stop-loss reinsurance model based on VaR and CTE, respectively. It is supposed that the aggregate loss X has an exponential distribution, and then the existence of the solution for retention under several premium principles with different premium additional factors is compared by the numerical simulation. The following result is obtained: CTE is superior to VaR for the existence of retention under three kinds of variance related premium principles.
六通道试验迭代目标信号筛选方法研究
Research on the Method of Selecting Iterative Target Signal for Six Channels Test
 [PDF]

晓俊,
Mechanical Engineering and Technology (MET) , 2016, DOI: 10.12677/MET.2016.52022
Abstract:
本文针对六通道道路模拟试验台迭代加速度目标信号筛选行了研究,提出了一种将载荷谱离散进行单位化拟合的相关度分析方法,计算了前车身加速度信号和前副车架应变信号之间的相关度,提出了一种基于相关分析的台架迭代目标信号筛选方法。以伪损伤最大原则筛选了一组台架试验迭代目标信号,对相关分析法筛选结果与伪损伤最大原则筛选结果进行了时域、频域、相关性三个方面对比。
In this paper, the selection of the acceleration signals of the six channels road simulation test bench is researched. The correlation between the strain spectrum of sub frame and the acceleration spectrum of the car body is calculated by linear fitting. Acceleration signals are selected by the result of the correlation analysis. In addition, six acceleration signals were selected by comparing the pseudo damage of each acceleration spectrum. This group of acceleration signals was analyzed and compared with signals selected by correlation analysis within time-domain, frequency-domain and correlation-domain.
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。
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