石灰石在煤气化过程中的催化和固硫作用

基于CaO在煤气化中的催化和固硫作用,以及石灰石加热分解的性质,石灰石有可能作为煤气化过程中的催化剂和固硫剂。本文根据国内外对石灰石在煤燃烧和煤气化中作用的研究,从石灰石结构、Ca/C,Ca/S,可能的反应机理等几个方面进行了介绍和分析,并指出需进一步研究的内容。     

Correlation of the reactivity,the active surface area and the total surface area of thin films of pyrolytic carbon

Using thin films of pyrolytic carbon the rate of the reaction with oxygen has been measured over the temperature range 625–740°C and at pressures of oxygen from 6–100 torr. The active surface area (ASA) of the films was measured from the total concentration of strongly-bound complexes with oxygen on the surface and the relative total surface area (TSA) was measured by low-temperature adsorption of nitrogen. A maximum in reactivity and in ASA was observed for films of average thickness of about 20 nm with a TSA of about 30 m² g^?1. At the maximum the ASA and TSA were essentially equal. The results are interpreted in terms of the mechanism of formation of pyrolytic carbon in the initial stages.     

Efficient object detection based on selective attention

In this paper, we make use of biologically inspired selective attention to improve the efficiency and performance of object detection under clutter. At first, we propose a novel bottom-up attention model. We argue that heuristic feature selection based on bottom-up attention can stably select out invariant and discriminative features. With these selected features, performance of object detection can be improved apparently and stably. Then we propose a novel concept of saccade map based on bottom-up attention to simulate the saccade (eye movements) in vision. Sliding within saccade map to detect object can significantly reduce computational complexity and apparently improve performance because of the effective filtering for distracting information. With these ideas, we present a general framework for object detection through integrating bottom-up attention. Through evaluating on UIUC cars and Weizmann–Shotton horses we show state-of-the-art performance of our object detection model.     

纳米SiO2粉体的制备与研究

纳米SiO2粉体的制备是以硅酸钠和盐酸为原料，添加适宜的稳定剂(非离子表面活性剂)和分散剂，在适宜的pH值和温度下，采用化学沉淀法合成。研究表明，要得到性能优良纳米的SiO2粉体，最佳工艺条件为：温度20～40℃，pH=6，反应液质量浓度P1=20g／L，P2=1．20g／L，反应时间15min。结果表明：制备的纳米SiO2粒径30～50nm，比表面积大，分散性好，质量优良，可达到产业化的生产。     

HDPE新牌号树脂的研究

根据扬子石化公司开发HDPE新牌号产品的生产经验,从分子量及分子量分布与树脂性能的关系、密度对HDPE性能的影响、HDPE的共聚改性、HDPE的共混改性、添加剂与HDPE改性等5个方面讨论了HDPE新牌号产品开发的方法。     

火电厂发电机组常见的电气故障与维修研究

发动机组是火电厂各生产环节中重要的组成部分,其运行效率不但决定了生产效率,还关系着各类生产资源应用的有效性,对实现节能降耗具有重要意义,所以,必须加强对其运行稳定性的管理。分析了火电厂发动机组常见电气故障,并提出了相应的解决措施。     

Robust state estimation for uncertain linear systems with deterministic input signals

In this paper, we investigate state estimations of a dynamical system in which not only process and measurement noise, but also parameter uncertainties and deterministic input signals are involved. The sensitivity penalization based robust state estimation is extended to uncertain linear systems with deterministic input signals and parametric uncertainties which may nonlinearly affect a state-space plant model. The form of the derived robust estimator is similar to that of the well-known Kalman filter with a comparable computational complexity. Under a few weak assumptions, it is proved that though the derived state estimator is biased, the bound of estimation errors is finite and the covariance matrix of estimation errors is bounded. Numerical simulations show that the obtained robust filter has relatively nice estimation performances.     

Photopolymerization of methyl methacrylate initiated by benzophenone/aromatic tertiary amines

Summary The photopolymerization of methyl methacrylate initiated by benzophenone-tertiary aromatic amines was studied under irradiation at 365 nm. The initiating amino radicals were investigated with combined ESR and spin-trapping method. The rate of polymerization for different amines was found in the sequence of p-hydroxymethyl-N,N-dimethylaniline>N,N-dimmethyltoluidine>N,N-dimethylaniline>p-methyl-N,N-dihydroxyethylaniline. The influence of diphenylmethanol on the polymerization reveals the incapacity of the benzophenone ketyl radical to initiate, while the amino end-group was detected in the polymers. This end-group can interact with benzophenone again, leading to initiate further polymerization to give a copolymer.     

硅氮聚合物交联的室温硫化橡胶的研究Ⅰ．热稳定性的研究

本文利用硅氮聚合物作文联剂使双组分缩合型室温硫化硅橡胶在不需要催化剂存在下就能交联硫化，通过时硫化胶老化后的热失重、交联密度和力学性能的测定，表明这种硫化胶的耐温性能由２００℃提高到３５０℃。对硫化胶的降解动力学研究表明：降解反应活化能由７０ｋＪ／ｍｏｌ提高到３３０ｋＪ／ｍｏｌ，这是由于消除了端基引发的主链降解。