3D image retrieval based on differential geometry and co-occurrence matrix

3D image retrieval approach is a challenging problem in the research of content-based image retrieval. In this paper, a novel retrieval approach combined differential geometry and co-occurrence matrix is presented. Firstly, Gaussian curvature and mean curvature are utilized to represent the inherent characteristic of spatial surface, and then we use co-occurrence matrix to store the shape information of 3D images. Secondly, normalization process is applied to the co-occurrence matrix and the invariants independence of the translation, scaling, and rotation transforms are proved. In comparison with the recent methods, experiments indicate a lower computation complexity and a better retrieval rate to 3D images with slight different shape characteristic.     

碳沉积法制富氮用炭分子筛的研究

本文提出的碳沉积法是用煤焦油馏分油的有机溶液浸渍煤炭化物,然后热解以进行“孔调变”。确定了最佳工艺条件,制得富氮性能良好的炭分子筛。并用D-A方程求取了各种样品的微孔结构参数。     

Lithium-ion battery remaining useful life estimation based on fusion nonlinear degradation AR model and RPF algorithm

The lithium-ion battery cycle life prediction with particle filter (PF) depends on the physical or empirical model. However, in observation equation based on model, the adaptability and accuracy for individual battery under different operating conditions are not fully considered. Therefore, a novel fusion prognostic framework is proposed, in which the data-driven time series prediction model is adopted as observation equation, and combined to PF algorithm for lithium-ion battery cycle life prediction. Firstly, the nonlinear degradation feature of the lithium-ion battery capacity degradation is analyzed, and then, the nonlinear accelerated degradation factor is extracted to improve prediction ability of linear AR model. So an optimized nonlinear degradation autoregressive (ND–AR) time series model for remaining useful life (RUL) estimation of lithium-ion batteries is introduced. Then, the ND–AR model is used to realize multi-step prediction of the battery capacity degradation states. Finally, to improve the uncertainty representation ability of the standard PF algorithm, the regularized particle filter is applied to design a fusion RUL estimation framework of lithium-ion battery. Experimental results with the lithium-ion battery test data from NASA and CALCE (The Center for Advanced Life Cycle Engineering, the University of Maryland) show that the proposed fusion prognostic approach can effectively predict the battery RUL with more accurate forecasting result and uncertainty representation of probability density distribution (pdf).     

富勒型篦冷机的性能特点和技术改造

富勒型篦冷机具有急冷熟料、热回收效率高和冷却效率高等性能。自1985年引进富勒篦冷机设计和制造技术以来，我国的篦冷机技术已完成了第一代、第二代、茅三代的技术更新和发展历程。针对第二篦冷机一些固有的缺陷，巢湖铁道水泥厂采用第三代篦冷机技术，对原609S-819S／809S-1025S型第二代篦冷机进行了改造并获成功。改造4年来，篦冷机运行稳定，维修较少，经济效益明显。     

PC-DCS关键技术研究

结合一个工控系统实例，介绍了一种PC－DCS系统数据刷新频率的方法，提出从使用智能通信卡，多串口通信，通信数据组织，以及测控仪表选型等全方位着手提高系统通信实时性的新思路。     

PPESK／PS共混物流变性能的研究

以溶液共沉淀的方法制备了含二氮杂萘联本结构的聚芳醚砜酮（PPESK）。聚苯乙烯（PS）共混物，用毛细管流变仪测定了共混物的流为性能。结果表明，在本实验条件下，PPESK／PS共混物熔体属假塑性非牛顿汉体，其熔体粘度随PS含量的增加、温度的升高、剪切速率的增大而下降。PS的加入有利于改善PPESK的熔融加工流动性。     

金属膦配位化合物在不对称催化反应中的应用

本文分别介绍了不对称催化合成技术及作为手性催化剂的金属膦配位化合物，并且简要综述金属膦配位化合物的研究与应用进展。     

开放式热风穿流干燥蔬菜降低能耗的研究进展

开放式热风干燥（AD）工艺以其设备成本低、操作和维修简单等特点，在国内大批量脱水蔬菜生产中仍占有较高的比例。但开放式AD蔬菜的能耗高，故对其进行节能技术研究是项急需而有意义的。我们可以从AD工艺前处理、AD和其它干燥方法联合、干燥系统改进、余热回收以及工艺参数再优化等5个方面来降低AD蔬菜生产中的能耗。     

PVC芯层发泡管的研制

PVC芯层发泡管除具备实壁管的性能外,还具有抗冲强度高、适用温度变化大、建筑下水隔音等优点,并且节省原材料25％～30％。通过试验确定了生产工艺要点。产品质量达到或超过了等效采用美国ASTM F891同类产品标准的企业标准。