Decentralized Stabilization of Large-scale Uncertain Systems with State-Delays——LMIs Approach

This paper deals with the problem of decentralized robustcontrol for a class of interconnected uncertain systemswith state delays.The parameter uncertainties are un-known but norm-bounded.A new sufficient condition isobtained for each subsystem and overall system to be sta-bilizable via linear memoryless state feedback robust de-centralized controllers.The results depend on the size of the delays and are given in terms of linear matrix ine-qualities,so they are less conservative than those of delay-independent.Moreover,matching condition is not a necessary condition.Finally,an example is presented to illustrative the effectiveness of the proposed method.

Utilization Survey of Livestock Manure Resources in Large-scale Farms of Yangzhou

Based on surveying the conditions of large -scale farms and commercial manure in the each county of Yangzhou city, the situations and problems for utilization of livestock manure resources were grasped. After an analysis of the potential value of livestock manure, the suggestion and strategy for utilization of livestock manure resources were proposed based on the actual conditions in Yangzhou city.

Formation conditions and exploration direction of large natural gas reservoirs in the oil-prone Bohai Bay Basin, East China

The Bohai Bay Basin is a typical oil-prone basin, in which natural gas geological reserves have a small proportion. In this basin, the gas source rock is largely medium-deep lake mudstone with oil-prone type Ⅱ2-Ⅱ1 kerogens, and natural gas preservation conditions are poor due to active late tectonic movements. The formation conditions of large natural gas fields in the Bohai Bay Basin have been elusive. Based on the exploration results of Bohai Bay Basin and comparison with large gas fields in China and abroad, the formation conditions of conventional large-scale natural gas reservoirs in the Bohai Bay Basin were examined from accumulation dynamics, structure and sedimentation. The results show that the formation conditions of conventional large natural gas reservoirs in Bohai Bay Basin mainly include one core element and two key elements. The core factor is the strong sealing of Paleogene "quilt-like" overpressure mudstone. The two key factors include the rapid maturation and high-intensity gas generation of source rock in the late stage and large scale reservoir. On this basis, large-scale nature gas accumulation models in the Bohai Bay Basin have been worked out, including regional overpressure mudstone enriching model, local overpressure mudstone depleting model, sand-rich sedimentary subsag depleting model and late strongly-developed fault depleting model. It is found that Bozhong sag, northern Liaozhong sag and Banqiao sag have favorable conditions for the formation of large-scale natural gas reservoirs, and are worth exploring. The study results have important guidance for exploration of large scale natural gas reservoirs in the Bohai Bay Basin.

Large scale manufacture of magnetic polymer particles using membranes and microfluidic devices

Magnetic polymer particles have found applications in diverse areas such as biomedical treatments, diagnosis and separation technology. These applications require the particles to have controlled sizes and narrow size distributions to gain better control and reproducibility in use. This paper reviews recent developments in the preparation of magnetic polymer particles at nano- and micro-scales by encapsulating magnetic components with dissolved or in situ formed polymers. Particle manufacture using emulsification and embedment methods produces magnetic polymer particles at micro-scale dimensions. However, the production of particles in this range using conventional emulsification methods affords very limited control over particle sizes and polydispersity. We report on alternative routes using membrane and microfluidics emulsification techniques, which have a capability to produce monodisperse emulsions and polymer microspheres （with coefficients of variation of less than 10%） in the range from submicrometer to a few 100 μm. The performance of these manufacturing methods is assessed with a view to future applications.

AN ADAPTIVE CONTROL STRATEGY FOR PROPER MESH DISTRI-BUTION IN LARGE EDDY SIMULATION

The Filtering Grid Scale （FGS） of sub-grid scale models does not match with the theoretical Proper FGS （PFGS） because of the improper mesh. Therefore, proper Large Eddy Simulation （LES） Mesh is very decisive for better results and more economical cost. In this work, the purpose is to provide an adaptive control strategy for proper LES mesh with turbulence theory and CFD methods. A new expression of PFGS is proposed on the basis of -5/3 law of inertial sub-range and the proper mesh of LES can be built directly from the adjustment of RANS mesh. A benchmark of the backward facing step flow at Re = 5147 is provided for application and verification. There are three kinds of mesh sizes, including the RANS mesh, LAM （LES of adaptive-control mesh）, LFM （LES of fine mesh）, employed here. The grid number of LAM is smaller than those of LFM evidently, and the results of LAM are in a good agreement with those of DNS and experiments. It is revealed that the results of LAM are very close to those of LFM. The conclusions provide positive evidences for the novel strategy.

聚合瓷嵌体修复活髓牙大面积牙体缺损的临床研究及感染预防

目的分析聚合瓷嵌体修复活髓牙大面积牙体缺损的临床疗效及感染预防。方法选取活髓后牙大面积牙体缺损患者42例患牙48颗,随机分为实验组(24颗牙)和对照组(24颗牙)。其中实验组牙体预备,聚合瓷嵌体修复;对照组应用金属烤瓷冠修复,应用RelyX Unicem树脂黏接剂随诊2年并评价疗效,分析感染预防方法。结果实验组在颜色匹配、形态匹配、继发龋、边缘适合性、磨损与断裂方面均较对照组有优势,差异有统计学意义(P<0.05)。结论应用聚合瓷嵌体修复活髓牙大面积牙体缺损的临床疗效优良,患者随访2年后在形态、颜色匹配与功能方面均作用优良。

硅微粉等离子改性及其在IC封装用EMC中应用

使用射频等离子,通过等离子表面聚合技术对环氧树脂模塑料用硅微粉进行改性,考察了放电功率、处理压力、处理时间对硅微粉表面处理效果的影响。用于硅微粉表面等离子聚合包覆的单体有吡咯、1,3-二胺基丙烷、丙烯酸、尿素,包覆后硅微粉用红外光谱和接触角来表征。使用等离子包覆后的硅微粉制备了大规模集成电路封装用环氧树脂模塑料(EMC)。结果表明,硅微粉表面能够被吡咯、1,3-二胺基丙烷、丙烯酸、尿素包覆。利用等离子改性后的硅微粉制备的EMC性能被提高。

聚酰胺6聚合技术的最新进展与研究

介绍了最近十多年来世界聚酰胺6(PA6)聚合器单线产能大型化、单体和低聚体全回用、高性能改性添加剂的研究和应用等PA6聚合的主要工艺和技术的最新进展,分析了实现PA6切片低成本、低消耗、高性能、高质量的主要因素和PA6聚合主要技术的发展方向。

大型PVC聚合釜配套釜顶冷凝器的设计制造要点

介绍了国内几种大型PVC聚合釜相配套釜顶冷凝器的结构形式及制造要求,分析了设备的设计、制造难点及制造时必须保证的设计指标和制造工艺。

Probing dynamics of dark energy with latest observations

We examine the validity of the ACDM model and probe the dynamics of dark energy with the latest astronomical observations. Using the Ore（z） diagnosis, we find that various kinds of observational data are in tension within the ACDM framework. We then allow for dynamics of dark energy and investigate the constraint on dark energy parameters. We find that for two different kinds of parametri- sations of the equation of state parameter w, a combination of current data mildly favours an evolving w, although the significance is not sufficient for it to be supported by Bayesian evidence. A forecast of the DESI survey shows that the dynamics of dark energy could be detected at the 7σ confidence level and would be decisively supported by Bayesian evidence, if the best-fit model of w derived from current data is the true model.

PVC大型聚合釜缺陷检测及分析

PVC产品因其工艺成熟、成本低廉,广泛应用于生产生活的各个方面。聚合釜是PVC的生产工艺中最关键的设备之一,通过搅拌传动系统和传热系统等完成聚合反应,所以聚合釜的安全运行对PVC正常生产起着至关重要的作用。文章介绍了某化工厂5台PVC大型聚合釜的定期检验过程,就检验过程中出现缺陷的位置和类型进行了统计,对缺陷产生的原因进行了分析,并提出了减少缺陷产生的措施。

氯醋树脂生产装置大型化的设想

介绍了国内悬浮法氯醋树脂的生产现状,对比了国内外氯醋树脂的质量差距,阐述了氯醋树脂生产装置大型化的必要性与可行性,提出了生产装置大型化的设计思路,分析了实现生产装置大型化的要点、难点和注意事项。