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Search Results: 1 - 10 of 59713 matches for " 田洪 "
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四川乐山大佛砂岩的成因

沉积学报 , 1990,
Abstract: 四川乐山地区上白垩统夹关组红色砂岩到底是水成的还是风成的已经争论了很久。许多人根据它宏观的沉积构造特征认为是风成砂岩,但并未提出令人信服的证据。为了解决这一问题,本文作者从沉积构造、垂向序列、粒度分布特征,石英砂表面特征等四个方面详细论证了这套砂岩的确形成于干旱的沙漠环境,但不时受到间歇性河流的影响。该区典型的垂向序列由粒度明显不同的两套岩石组成。中到下部为细到中粒长石石英砂岩具巨型斜层理,属内陆砂丘成因。上部粉砂岩具沙纹层理,含钙质结核和泥质纹层,属间歇性片流沉积。粒度分析和石英砂扫描电镜分析有力地支持了这一结论。综合分析区域地层学和岩相古地理资料可知,晚白垩世时乐山地区处于干旱气候下距西部山前冲积扇不远的沙漠环境。
城市社会背景下的“产城融合”发展问题研究
陈绍友,
重庆师范大学学报(自然科学版) , 2014, DOI: 10.11721/cqnuj20140524
Abstract: 城市产生时就与产业密切相关,在进一步发展中却出现了城市与产业的隔离与分离,解决不好可能再现城市破产,因此,“产城融合”是“城市社会”时期需要认真研究的新问题与大问题。“产城融合”发展是在城市化进程推进过程中产业与城市相互配合、良性互动,共同推进城市持续健康发展、现代文明进步和广大人民群众提高生活质量。本研究认为,站在城市发展的角度,“产城融合发展”的研究与探索应当从“城市新区与新区产业”、“城市整体与城市产业体系”、“城市与区域产业”等3个层面渐次展开;站在产业发展的角度,“产城融合发展”要强化“以人为本”和“系统经营”观念,在更宽的市场背景中去寻求和选择城市产业发展内容。如此,才能实现城市产业体系优化,推动现代城市文明发展。
第二届全国心血管药理专业学术会议简讯

药学学报 , 1984,
Abstract:
全国肿瘤化疗药理学会简讯

药学学报 , 1983,
Abstract:
西藏高原云的几个特点

气象 , 1980, DOI: 10.7519/j.issn.1000-0526.1980.11.012
Abstract:
山东调整阿胶价格

中国中医药信息杂志 , 1994,
Abstract: <正>为促进生产,调动企业的积极性,根据成本和市场情况。经山东省物价局同意,山东省医药局决定从1994年2月20日起,对阿胶价格作适当调整。具体如下(金额单位:元):
风味指纹结合PLS-DA用于羊肉香精风味质量的评定

- , 2016, DOI: 10.13982/j.mfst.1673-9078.2016.4.046
Abstract: 实验采用SPME-GC-MS结合GC-O技术对25个不同批次的羊肉样本中的挥发性成分进行分析鉴定,共筛选获得32种共有风味物质作为羊肉特征风味评定的关键化合物,以此为分类变量,结合五种常见肉类样品中相对应化合物的种类和含量,构建用于鉴别天然羊肉风味的偏最小二乘回归-判别分析(PLS-DA)模型,所建模型相关系数大于0.90,校正和预测误差均方根均小于0.3,表明所建模型拟合度较好,可以应用于天然羊肉风味的识别。依据所建立的PLS-DA模型,对自制一系列羊肉香精(MPF)风味的天然模拟程度进行评估。结果表明:由不同美拉德反应体系制备的羊肉香精呈现显著差异,整体风味属性依次为MPF5> MPF6-8>MPF2>MPF4>MPF1>MPF3。为了考察所建模型对羊肉风味评定的准确性和可靠性,结合课题组已建立的描述性感官分析方法对所PLS-DA模型评定的结果进行了验证,结果趋势较为一致,表明通过结合PLS-DA模型可以替代传统的描述性感官分析用于羊肉香精风味质量的评定。
The volatile components in twenty-five mutton samples from different batches were analyzed by headspace– solid phase microextraction gas chromatography mass spectroscopy (SPME-GC-MS) and gas chromatography-olfactometry (GC-O). Thirty-two common volatiles were identified as the key compounds for the evaluation of the characteristic mutton flavor. Based on these 32 compounds, the variables were classified, and the partial least squares discriminant analysis (PLS-DA) model was developed for the identification of natural mutton flavor relative to the types and content of the corresponding compounds in five common meat samples. The correlation coefficient of the PLS-DA model was > 0.90, and the root mean square error of calibration (RMSEC) and root mean square error of prediction (RMSEP) were < 0.3, indicating that this model achieved a good fit and could be used for the identification of natural mutton flavor. Subsequently, PLS-DA model was used to evaluate the degree of natural flavor simulation for a series of mutton process flavor (MPF) samples that were prepared in our lab. The results showed that there were significant differences among MPF samples that were prepared by different Maillard reaction systems. The order of the flavor quality for the MPF samples studied was as follows: MPF5 > MPF6-8 > MPF2 > MPF4 > MPF1 > MPF3. In order to validate the accuracy and reliability of the model for the evaluation of mutton flavor, descriptive sensory analysis (DSA), previously established by our group, was used to examine the results obtained from PLS-DA model. The results were consistent, indicating that PLS-DA model can replace the traditional DSA method in the evaluation of the flavor quality of MPFs.
基于LM神经网络瓦斯灾害预测模型的应用研究
Applied Research on the Prediction Model of Coalmine Gas Disaster Based on the LM Neural Network
 [PDF]

, 茂义, 柳林, 韩李涛
Advances in Geosciences (AG) , 2012, DOI: 10.12677/AG.2012.22012
Abstract: 矿山瓦斯突出与爆炸事故的预测预报是当前我国煤矿安全生产中急待解决的问题之一。本文引入BP神经网络的LM优化算法,在保留空间实体相关和多种分布并存的前提下,讨论了建立LMBP神经网络瓦斯灾害预测预报模型的数学模型设计、网络结构设计和程序设计三个部分,并以兖矿集团济宁二号井为实例进行了测试。实验结果表明:该模型稳定、快速、预测精度高,能够较好地模拟矿山瓦斯突出与爆炸事故特征,对瓦斯灾害作出较准确的预测。
Currently the forecasting of gas outburst and explosion is one of the issues to be solved in China’s coal mine safety production. Based on the LM optimization algorithm of BP neural network, this paper discussed the mathe- matical model, network architecture and programming design of establishing the neural network prediction model on gas disaster with keeping the relationship among the spatial entities and their distributions, and tested an instance of Jining No. 2 coal mine. The result shows that this model is stable, fast and high prediction accurate and it can simulate the mine gas disaster to get higher accurate predictions.
海洋漂流浮标在海洋洋流模拟中的应用
Application of Drifting Buoy in Ocean Current Simulation
 [PDF]

, 柳林, 茂义, 韩李涛
Advances in Geosciences (AG) , 2013, DOI: 10.12677/AG.2013.34029
Abstract:
本文介绍了基于GPS导航定位系统研制的小型漂流浮标工作原理,分析了漂流浮标跟踪模拟美国东部沿海洋流的运动过程,为漂流浮标在海洋环境监测中的应用提供了前期实验和资料准备。
This paper introduced the working principle of the small size drifting buoys that is based on the GPS system and analyzed the motion process of the ocean current along the USA east coast by tracking simulation. The purpose is to provide the prophase experiments and usage experience of the drifting buoys in the marine environmental monitoring.
CaMnO3晶体结构、电子结构和磁性质的杂化泛函研究
Study of Crystal Structure, Electronic Structure and Magnetic Properties of CaMnO3 from Hybrid Functional Approach
 [PDF]

戴佳,, 雎胜
Applied Physics (APP) , 2016, DOI: 10.12677/APP.2016.64009
Abstract:
基于杂化密度泛函理论,我们研究了钙钛矿型过渡金属氧化物CaMnO3的晶格结构和电子结构,并与传统的局域密度近似和广义梯度近似相比较。计算表明杂化泛函给出的晶体结构与实验结果非常吻合,同时2.5 eV大小的能隙与实验上测得的3.1 eV也十分接近。更进一步,我们计算了Mn4+离子间的磁交换作用系数,并用蒙特卡罗方法估算出体系的尼尔温度为87 K,这与实验上的131 K也比较符合。这些结果表明杂化泛函可以很好预测绝缘型过渡金属氧化物的物理性质。
Based on the Heyd-Scuseria-Ernzerhof (HSE) screened hybrid density functional theory, we have studied the crystal structure, electron structure, and magnetic properties of perovskite transition metal oxide CaMnO3. Compared with traditional local density approximation and generalized gradient approximation, the crystal structure within HSE is in good agreement with experimental data. In addition, a 2.5 eV band gap is close to 3.1 eV from experiment. Furthermore, with the magnetic exchange coupling constants, the magnetic transition Néel temperature of CaMnO3is 87 K, consistent with the experiment value of 131 K. These findings indicate that the hybrid functional could provide a proper description of insulating transition metal oxides.
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