Vapor-liquid equilibrium and volumetric properties calculations for solutions in the supercritical carbon dioxide

The calculations of gas solubilities in supercritical solvents require equations of state remaining accurate in the critical range, which are difficult to obtain with classical models. In this work, the Helmholtz energy of a mixture is considered as the sum of the Helmholtz energies of pure components taken at a constant packing fraction and of a residual term which may have the form of a RedlichKister, Van Laar, NRTL, UNIQUAC, or UNIFAC function. Thus it is possible to assign to a given component an equation of state whose form is different from that of the others. This model has been applied to binary systems containing supercritical carbon dioxide. The results are improved with respect to those obtained with the classical model for vapor-liquid equilibria and for volumetric properties.     

富水电厂机组在线监测及状态检修

介绍了在富水电厂实施状态检修管理体制的情况以及与之相关的在线监测技术。     

What the small Rubik’s cube taught me about data structures, information theory, and randomisation

This article discusses observations made when the state space of the 2 × 2 × 2 Rubik’s cube was constructed with various programs based on various data structures, gives theoretical explanations for the observations, and uses them to develop more memory-efficient data structures. The cube has 3,674,160 reachable states. The fastest program runs in 20 s and uses 11.1 million bytes of memory for the state set structure. It uses a 31-bit representation of the state and also stores the rotation through which each state was first found. Its memory consumption is remarkably small, considering that 3,674,160 × 31 bits is about 14.2 million bytes. Getting below this number was made possible by sharing common parts of states. Obviously, it is not possible to reduce memory consumption without limit. We derive an information-theoretic hard average lower bound of 6.07 million bytes that applies in this setting. We introduce a general-purpose variant of the data structure and end up with 8.9 million bytes and 48 s. We also discuss the performance of BDDs and perfect state packing in this application.     

Effects of calcination temperature on phase and microstructure evolution of BaTi4O9 powders

Calcining of the mixture of BaCO₃ and TiO₂ with a ratio 1:4 at different temperatures was carried out to synthesize BaTi₄O₉ powders. Phase evolution of the samples was studied using the differential thermal analysis (DTA) and X-ray diffractometry (XRD). Both techniques confirmed that the formation of BaTi₄O₉ started around 1000 °C. The XRD peaks showed that BaTi₄O₉ was most pronounced at 1250 °C. X-ray line broadening methods were employed to study the variation of particle size and microstrain of the BaTi₄O₉ powders. The Voigt function in a single line and the pseudo-Voigt function in the variance methods were used in our case. We found that both functions resulted in the same trends, i.e., the particle size increased with the temperature with the biggest size of 180 and 160 nm, whilst the microstrain yielded the opposite trend with the lowest values of 6.2 × 10^–3 and 1.1 × 10^–3. The scanning electron microscopy (SEM) study revealed the size of the large particles formed, due to agglomeration, to be about 0.5–1.9 μm. Furthermore, it was shown that irregular shapes of BaTi₄O₉ powders necked to each other appeared at 1000 °C and grew into ellipse and rod shapes at 1250 °C. Electronic Publication     

国有企业党风廉政建设中的问题及治理研究

剖析国有企业党风廉政建设中的突出问题。提出“推进国有企业党风廉政建设运用市场经济原则经营运作是重要途径;加强对企业经营管理者的监督管理是关键;完善法人治理结构、建立企业内部权力制衡机制是重要基础”的观点。     

实施ISO14000标准促进中国企业可持续发展

阐述ISO14000标准与国有企业可持续发展的关系。企业按ISO14000建立环境管理体系是企业可持续发展的重要方面，具有战略意义。企业施行ISO14000标准的效能显著，但目前实行IS O14000的企业相对较少。分析了企业施行ISO14000标准存在的困难，提出了建立环境管理体系的几点建议。     

高维滞环多值电路唯一稳态的研究

本文利用矩阵分解方法，在用常数界定元件成份关系斜率条件下，得到了确定高维具有滞环的非线性非自治电路唯一稳态的新条件。本文的结果表明，该类电路的唯一稳态，可以用分解矩阵的稳定性来决定，本文的结果中，电路元件可以是多值元件，这大大放松了目前已的经典结果中要求电路元件为单值的限制，扩展了已有的结果，同时，本文的结果，对于确定高维非线性非自治电路的唯一稳态，比已有结果，更加有力和简洁。     

成藏流体历史分析——以黄骅坳陷三马地区为例

应用储集层岩石烃类流体包裹体研究方法，对黄骅坳陷三马地区沙一段油藏进行了重建成藏流体历史的尝试。对包体流体状态的分析表明，成藏流体具有高密度，高矿化度的性质，被捕获时的温度约为110－140℃，成藏流体的主要充注时期在明化镇组沉积期，距今为10－4Ma之前，充注成藏后的小幅度构造抬升中可能使原称油水界面以下的地层水矿化度发生变化，导致现今储集层流体矿化矿比包裹体流体矿化度明显下降。图5表2参6（钟宁宁摘）。     

二极管端泵浦连续激光器激活介质长度与透过率的优化

从准三能级系统的速率方程出发,推导出了二极管(LD)端泵浦连续工作端面泵浦固体激光器的速率方程,提出了计算连续LD端面泵浦激光器输出功率的方法,并表示成激活介质长度和透过率的函数,由此得到在泵浦功率一定情况时的优化设计步骤。数值计算结果与我们的实验结果和文献[3],[4]的实验数据符合甚好。