oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 38 )

2018 ( 753 )

2017 ( 780 )

2016 ( 802 )

Custom range...

Search Results: 1 - 10 of 30236 matches for " 陆鑫 "
All listed articles are free for downloading (OA Articles)
Page 1 /30236
Display every page Item
甘蔗野生种滇蔗茅种质创新利用研究Ⅱ.滇蔗茅F1群体重要农艺性状的遗传分析

湖南农业大学学报(自然科学版) , 2012,
Abstract: 以热带种路打士(Saccharum officinarum)与滇蔗茅(Erianthus rockii)云南95–19属间远缘杂交F1群体的62个无性系为研究对象,利用方差、相关、逐步回归及通径分析方法对其单茎重、株高、茎径、有效茎、节间长度、小区产量等6个农艺性状进行遗传分析。结果表明:所有性状分布频率接近正态分布,单茎重、株高、茎径、节间长度在后代群体中存在双向超亲分离,有效茎平均表型值高于母本,小区产量平均表型值低于母本;有效茎、节间长度与小区产量呈极显著正相关,并解释小区产量48.9%、3.4%的变异信息;单茎重与小区产量呈显著正相关,并解释小区产量32.3%的变异信息;株高、茎径主要通过间接效应影响小区产量,有效茎、单茎重、节间长度更适于作为该群体后代材料高产潜力的选择指标。
甘蔗野生种滇蔗茅利用研究Ⅲ.滇蔗茅杂种F1群体的表型变异与遗传多样性分析

植物遗传资源学报 , 2013,
Abstract: 选用8个数量性状和18个质量性状对滇蔗茅杂种F1群体的表型变异、多样性及聚类关系进行分析。结果表明:数量性状的遗传变异主要来自于有效茎、单茎重及糖分;质量性状的叶鞘背毛群与内叶耳形状多样性丰富,根点排列、芽位、茎形、节间性状、生长裂缝等5个性状均表现一致;聚类分析表明62份后代材料可分为4大类群和10个亚类群。遗传多样性和聚类分析为杂交后代的筛选及其杂交或回交利用提供了科学依据。
预应力混凝土吊车梁型式的分析与比较(下)

工业建筑 , 1978, DOI: 10.13204/j.gyjz197804003
Abstract: 混凝土标号对强度、抗裂的影响以6米和12米四种20根梁为例,选择不同的混凝土标号进行分析。图12~17表示混凝土标号与正截面强度、正截面抗裂和主拉应力的关系。从这些图中可以看出1.混凝土标号的变化,在梁截面尺寸
预应力混凝土吊车梁型式的分析与比较

工业建筑 , 1978, DOI: 10.13204/j.gyjz197803004
Abstract: 本文从设计、施工、受力性能、材料用量等方面,对梁的型式(等截面和变截面)和截面尺寸(梁高、腹板厚度、混凝土标号及钢种变化等)加以分析讨论,从而对预应力混凝土吊车梁的设计原则、型式选择和材料采用等提出了具体建议。
中外大宗农产品价格波动与传导机制:相关性复杂网络的视角
Price fluctuation and transmission mechanism of bulk agricultural products in domestic and abroad: Based on correlation complex network

,,泓宇
- , 2017,
Abstract: 为了解中外大宗农产品价格波动规律,应用复杂网络和统计物理学分析方法,对中国和美洲市场大宗农产品玉米、小麦和大豆在双变量相关性波动模态的变化规律、强度分布和聚集系数方面的差异性进行了研究。结果表明,中外大豆价格波动以弱正相关性为主,小麦价格更多的表现为弱负相关性,而玉米价格正相关性和负相关性波动较为均衡。3种农产品的价格相关性波动表现出不同的群簇性和周期性,波动网络通过各自不同的核心模态进行传递和演化。最后提出了依据国内外农产品价格波动周期及趋势进行价格调控的政策建议。
In order to get an insight into the regularities of price fluctuation of bulk agricultural products in China and foreign countries,complex networks and statistical physics are used to analyze the differences of corn.Wheat,corn and soybeans are taken the study objects of bulk agricultural products in China and the Americas market to investigate the variation regularity,strength distribution and cluster coefficient of bivariate correlation fluctuation modes.Research results show that:The soybean price fluctuation in China and foreign countries is mainly effected by weak positive correlation;The price of wheat displays a weak negative correlation,and the corn price stays more balanced between the positive and negative correlation fluctuations;The correlation fluctuation of three kinds of agricultural products shows different clusters and periodicity.The fluctuation of bivariate correlation is transmitted and evolved by a few modes.Countermeasures and suggestions about price adjustment and control are proposed on the cycle and trend of price fluctuation of agricultural products at domestic and abroad in this study.
复合材料圆柱壳中心受横向集中载荷作用的渐进破坏非线性有限元分析
,伟*
复合材料学报 , 2010,
Abstract: 旨在建立能够正确预计复合材料圆柱壳的屈曲和后屈曲渐进破坏行为的模拟策略。采用有限元方法和Hashin失效准则进行模拟,基于该失效准则编写了用户材料子程序,然后插入到商用有限元软件ABAQUS中。分析了中心受横向集中载荷作用复合材料圆柱壳板,壳板的2条直边弹性支持,2条曲边自由。为了探讨弹性边界条件和集中载荷作用点应力集中的影响,将有限元分析结果与文献中的试验结果进行了比较,提出了一种合理的弹性边界选取依据。研究结果表明,在建模中考虑了弹性边界和集中载荷作用点处存在的应力集中后,本文中模拟的结果与文献中的试验结果比较接近,模拟精度明显高于文献中报道的结果。这也验证了本文中建立的模拟策略的合理性。
基于相空间重构和ICA-R的轴承故障特征增强方法
A Method of Enhancing the Fault Characteristics in Early Stage of Rolling Bearing Based on Phase-Space Reconstruction and ICA with Reference

柏林,,
- , 2016, DOI: 10.16450/j.cnki.issn.1004-6801.2016.06.010
Abstract: 针对实测滚动轴承早期故障信号中故障特征频率成分微弱、难以识别及提取的问题,设计了一种结合相空间重构(phase-space reconstruction,简称PSR)和参考独立分量分析(independent component analysis with reference,简称ICA-R)的故障特征增强方法。利用相空间重构将一维时域信号拓展到高维,再进行参考独立分量分析,将所感兴趣的轴承故障特征频率成分进行增强。该方法相比传统频率提取方法具有效果好、对干扰频率抑制明显的特点。仿真结果和工程实测信号表明,该方法对滚动轴承早期故障特征提取有效可行,具有一定工程应用价值。
In the early stages of rolling bearing fault diagnosis, the characteristic frequencies of different parts are weak and difficult to identify. Thus, this paper presents a method to enhance the interested frequency components of rolling bearing. This method has better results and higher resistance to interference frequencies than do traditional methods using phase-space reconstruction to expand the time-domain signal into a high dimension space and independent component analysis with reference (ICA-R) to find the closest component to the reference signal. The simulation results and actual measurements of signals prove that this method is effective and feasible in early stage fault diagnosis, and also has certain values for engineering applications.
影响海洋平台检测质量因素的模糊综合评判分析
宋儒,,刘振国
海洋工程 , 1996,
Abstract: 本文通过对海洋平台结构实际检测工作的调查分析,着重研究了检测人员的失误对检测质量影响的主要因素,并运用模糊数学的基本理论,对包括人因素,非人因素。进行了多级模糊综合评判,建立了相应的对检测质量影响的理论模型。为验证所建立的数学模型的正确性和有效性,进行了数值实例计算。计算分析结果表明,本文所建立的理论分析模型是比较科学合理的,能较好地分析人的因素对检测质量的影响,为平台结构的完整性、可靠性以及剩余寿命的评估提供了基础和依据
物料配送与线边存储集成决策模型与算法
志强,,
- , 2018, DOI: 10.3785/j.issn.1008-973X.2018.07.016
Abstract: 以飞机移动装配线的物料供给为应用背景,将该过程抽象为一类物料配送与线边存储集成优化问题,在线边空间可共享和重复使用的环境下对物料的配送及物料在线边的存储两类子问题进行联合决策.以小车配送次数最小化为目标函数,建立集成优化数学模型.针对该模型,设计基于蚁群算法的混合启发式算法.该算法的核心思想为借助蚁群算法的全局搜索能力搜寻较优的物料组批方式,通过基于物料批次划分的解生成算法联合决策各物料的配送时刻和物料在线边空间的存放位置.为了进一步提高解的质量和求解成功率,在解码算法中嵌入物料摆放位置调整的修复算法,对物料的存储方案进行再优化.通过数值实验,证明了模型与算法的有效性.
Abstract: The material supply process was abstracted as an integrated optimization problem of material delivery and line-side storage by taking the material supply for aircraft moving assembly line as the application background. Joint decisions were made for two sub-problems of material delivery and line-side storage in the conditions where the line-side space is shareable and reusable. An integrated optimization mathematical model was established to minimize the number of deliveries. A hybrid heuristic based on ant colony optimization (HACO) was proposed to solve the model. The core mechanism of HACO was to seek the optimized composition of material batches by the global searching capability of ant colony optimization algorithm. A batch-based solution generating algorithm was adopted to jointly make decisions on delivery time and storage positions at the line-side space for each material. A repairing algorithm was embedded in the decoding process to re-optimize the storage scheme of materials in order to further enhance the quality and the success rate of solutions. The effectiveness of the model and algorithm was verified through numerical experiments.
父母情绪社会化行为与青少年同伴社交技能的关系:教养方式的调节作用
Association between Parental Emotion-Related Socialization Behaviors and Adolescents’ Peer Social Skills: Moderated by Parenting Style
 [PDF]

, 梁宗保, 邓慧华, 叶明, 祖宏
Advances in Psychology (AP) , 2012, DOI: 10.12677/AP.2012.23023
Abstract: 采用问卷调查法,考察父母情绪社会化行为对青少年同伴社交技能的独特贡献及父母教养方式在其中的调节作用。结果发现:1) 在控制了教养方式之后,母亲情绪教导能显著正向预测青少年同伴社交技能,表明母亲情绪社会化行为对青少年同伴社交技能有独特贡献。父亲情绪社会化行为对青少年同伴社交技能的预测不显著,说明其在同伴社交技能上不存在独特贡献。2) 父亲温暖支持、自主鼓励调节了父亲情绪谈论、情绪教导与青少年同伴社交技能之间的关系,但母亲教养方式对其情绪社会化行为与青少年同伴社交技能之间的调节作用不明显。
The present study which using questionnaire method aimed to examine the unique effect of PERSB (Parental emotion-related socialization behaviors) on adolescents’ peer social skills and the moderate effect of parenting style on PERSB-peer social skills relation. The regression results showed that: 1) Maternal coaching of emotion was positively related to adolescents peer social skills after their parenting style was controlled. However, paternal PERSB didn’t predict peer social skills. This indicated that maternal PERSB have an additional effect on adolescents’ peer social skills relative to the maternal parenting style. 2) The relation of paternal emotion discussion and coaching and adolescents’ peer social skills was moderated by paternal warmth and autonomy. Whereas, there is no moderating effect for mother’s parenting style.
Page 1 /30236
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.