气液混合物通过孔板的修正能量流动模型及其在双参数流量测量中的应用

根据能量方程能确切地反映气液双相流动中的不可逆损失这一特点,在劳伦兹能量模型的基础上,本文提出了新的截面含气率的计算方法,从而得到了修正分相能量模型,并以此作为处理数据的依据。作者用三块不同截面比的安装在管径为50.8mm的管道上的锐缘孔板,分别与口径为100mm的椭圆齿轮流量计组合进行了试验,试验结果表明,利用此模型处理数据时,不必考虑孔板截面比的影响,也不必考虑被测介质干度范围的影响。在本试验的范围中,(0.00111相似文献   

Resilience and Survival: Black Teenage Mothers ‘Looked After’ by the State Tell their Stories About their Experience of Care

‘Looked after’ young people are among the most disadvantaged members of our society. While their disadvantaged status should not be ignored, poor outcomes are often emphasised at the expense of good ones. This article reports a study that adopts the concept of resilience to understand the narratives of the participants’ experience of care and foster care. A total of 15 young mothers, aged 16–19 and mainly from black African backgrounds, were interviewed. Despite lacking a ‘secure base’, informants invested in a sense of moral identity and a source of self‐directedness, which enabled them to move from victim of circumstances to individuals who overcome their circumstances.     

多孔介质内流体相态特征超声波探测研究进展

目前有关烃类流体相态的研究已较为成熟,能为油气田的高效开发提供相应的理论指导和技术支持。但研究成果大多忽略多孔介质对流体相态的影响。为此,在充分考虑流体与多孔介质相互作用的基础上,开展多孔介质内流体相态特征的研究十分必要。随着研究的不断深入,超声波探测技术不受压力温度限制、不改变流体成分、检测成本低、对人体无害等优点逐渐得到重视,并在多孔介质内相态研究领域逐渐得到了应用。在参考国内外相关文献资料的基础上,简述了超声波的探测机理,重点综述了超声波探测在多孔介质内天然气水合物、凝析油气相态特征研究的应用进展,并指出了目前存在的主要问题及今后的研究重点。     

开发区发展阶段识别及差异化调控对策研究——以湖南省为例

在文献回顾及相关专家访谈基础上,提出开发区成长指数、成长速度、成长累积的概念,并设计出计算方法,以此对湖南省开发区发展阶段及调控对策进行实证研究。首先划定几个临界值识别开发区发展阶段;然后说明湖南开发区发展呈现的明显的不均匀性;最后基于不同发展阶段特征提出相关差异化调控对策。     

Phase I trial design for drug combinations with Bayesian model averaging

Various statistical models have been proposed for two‐dimensional dose finding in drug‐combination trials. However, it is often a dilemma to decide which model to use when conducting a particular drug‐combination trial. We make a comprehensive comparison of four dose‐finding methods, and for fairness, we apply the same dose‐finding algorithm under the four model structures. Through extensive simulation studies, we compare the operating characteristics of these methods in various practical scenarios. The results show that different models may lead to different design properties and that no single model performs uniformly better in all scenarios. As a result, we propose using Bayesian model averaging to overcome the arbitrariness of the model specification and enhance the robustness of the design. We assign a discrete probability mass to each model as the prior model probability and then estimate the toxicity probabilities of combined doses in the Bayesian model averaging framework. During the trial, we adaptively allocated each new cohort of patients to the most appropriate dose combination by comparing the posterior estimates of the toxicity probabilities with the prespecified toxicity target. The simulation results demonstrate that the Bayesian model averaging approach is robust under various scenarios. Copyright © 2015 John Wiley & Sons, Ltd.     

二维XY模型动力学平均相距〈D（t〉与时间t关系的计算和分析

考察了二维XY模型的两种组态按Metropolis动力学随时间的演化，教育处得到了其在平方点阵上的动力学平均相距＜D（t）＞随时间t的变化关系，该＜D（t）＞－t图作了分析。     

语段理论下汉语旁格宾语的生成

虽然以往研究能解释汉语中旁格宾语的生成机制,但仍存在些许不足.语段理论能为旁格宾语的生成机制提供了一种新的解释：在旁格宾语结构中,动词的内论元为基础生成的空宾语e,旁格宾语实际上是介词脱落后的介词词组右附加到VP.由于e 不具有语音特征,不会被拼读出来.因此在语音系统拼读后,最终得到旁格宾语出现在动词之后.     

e-He弹性散射的相移计算

用与半经典交换势（ＳＣＥ）不同的三种交换势计算了低能ｅ－Ｈｅ弹性散射的相移，结果表明，这三种势均在不同程度上改善了ＳＣＥ势的结果．     

毛细电色谱中流动相的选择

本文以实验为依据，介绍了毛细电色谱中用ＯＤＳ 反相柱分离中性物时流动相的选择     

相变界面流动技术的计算精度

对用于固液相变问题数值模拟的界面流动技术的精度进行了讨论，分析表明对移动界面项使用一阶有限差分不能精确地描述界面的运动，特别是在解决如爆融情况下的高热流问题，建议使用二阶方法，其在所有情况下均可保证足够的精度。