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1.
Sun-Hwa Yeon Jeasung Park Youngjune Park Sukjeong Choi Kyuchul Shin Jiwoong Seol Minjun Cha Huen Lee 《Korean Journal of Chemical Engineering》2008,25(1):154-157
Clathrate compounds are crystalline materials formed by a physical interaction between host and relatively light guest molecules.
Various types of nano-sized cages surrounded by host frameworks exist in the highly unique crystalline structures and free
guest molecules are entrapped in an open host-guest network. Recently, we reported two peculiar phenomena, swapping and tuning,
naturally occurring in the hydrate cages. Helium, one of the smallest light guest molecules, must be the challengeable material
in the sense of physics and moreover possesses versatile applications in the field of superconductivity technology and thermonuclear
industry. In this regard, we attempted for the first time to synthesize helium hydrates at moderate temperature and pressure
conditions. According to inclusion phenomena, helium itself normally cannot form clathrate hydrates due to being too small
molecularly without the help of hydrate former molecules (sI, sII, and sH formers). In this study, the hydrate equilibria
of the binary clathrate hydrate containing tetrahydrofuran, helium, and water were determined at 2, 3, 5.56 THF mol%. Direct
volumetric measurements were also carried out to confirm the exact amount of helium captured in the hydrate cages. Finally,
the crystalline structure of the formed mixed hydrates was identified by powder X-ray diffraction, resulting in structure
II. 相似文献
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Combustion tests of pre-mixture of methane and air in constant volume combustion chamber(CVCC) have been carried out by means of flame propagation photo and gas pressure measurement,the effects of CVCC body temperature,intake pressure of pre-mixture of methane and air,equivalence ratio and location of the built-in adaptor have been investigated.The whole combustion chamber can be divided into two parts,i.e.the upper combustion chamber and the lower combustion chamber,by the built-in adaptor with through hol... 相似文献
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重新建立了共轭凸轮开口机构的动力学模型,组成相应的弹性振动微分方程.用矩阵摄动法分析该微分方程,并设计织机的开口机构.与传统的求解方法相比,计算时间减少20%,减小综框的振动以及降低断纬频率达到65%以上. 相似文献
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Shop-floor scheduling at shipbuilding yards using the multiple intelligent agent system 总被引:4,自引:0,他引:4
The intelligent agent system has become a typical approach to research distributed artificial intelligence and distributed problem solving. However, despite its various technical advantages, the distribution and expansion of the intelligent agent system approach has been limited because existing methodologies rely on specialized applications and therefore require intensive investment to develop new systems. In an attempt to conquer these difficulties, a standardized methodology to construct intelligent agent systems is proposed. This approach deviates from current agent system approaches of repeatedly constructing new and customized expert systems. Specifically, it provides an economical method for developing intelligent agent systems by investigating the possibility of standardizing message communication protocols in linguistics speech-act theory and by supplementing traditional algorithmic systems with intelligent segments using, among others, expert system tools. To verify effectiveness, the shop-floor scheduling system of a large-scale shipbuilding yard has been redesigned, developed, and tested using this approach. This shop-floor scheduling system requires the scheduling of when and where to process block construction under various constraints. It is a difficult four-dimensional time and space allocation problem involving traditional NP-complete search spaces. The tested intelligent agent system proposes an innovative method for reducing the search space into three levels: the algorithm level, the agent intelligence level, and the level of cooperation among agents. It also provides methods for solving deadlock occurrence and non-uniformity problems resulting from parallel processing. Test results demonstrate applicability and economy, among other technical advantages. 相似文献
7.
基于本文第1部分的数学模型,求解了各种工艺参数下铸件/铸型间的界面热流和换热系数,重点研究不同工艺参数对于界面热流和换热系数的影响.在现有的"阶梯"块铸件的条件下,计算结果表明:压铸过程各种工艺参数对于铸件/铸型界面热流和换热系数有着不同的影响规律.铸型初始模腔表面温度对于界面热流的峰值有着很大的影响,随着铸型初始模腔表面温度的上升,热流峰值不断下降.对于较厚的"阶梯"面,铸型初始模腔表面温度对于界面换热系数的影响较大,随着该温度的上升,界面换热系数的峰值不断下降;对于较薄的"阶梯"面,各种工艺参数对于界面换热系数的影响不大. 相似文献
8.
Although milling is one of the most common chip metal removal processes, little has been done to aid in identifying the optimum operational conditions for milling processes. In this paper, a mathematical model for milling operations is developed and the five primary control variables identified. The model is then decomposed and an efficient optimization procedure developed for control variable identification. 相似文献
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