铝电解槽阳极组装用磷生铁复合添加剂工业试验研究

电解铝是耗能大户,通过技术研发降低能耗是铝行业坚持不懈的追求.通过改进阳极组装用磷生铁的配方并添加复合改性剂的方法改善磷生铁性能,降低阳极组在电解槽内工作时的铁-碳压降.在现场试验中,经过测试,铁-碳压降降低约50mV,节能效果十分明显.     

Handy broker: an intelligent product-brokering agent for m-commerce applications with user preference tracking

One of the potential applications for agent-based systems is m-commerce. A lot of research has been done on making such systems intelligent to personalize their services for users. In most systems, user-supplied keywords are generally used to help generate profiles for users. In this paper, an evolutionary ontology-based product-brokering agent has been designed for m-commerce applications. It uses an evaluation function to represent a user’s preference instead of the usual keyword-based profile. By using genetic algorithms, the agent tracks the user’s preferences for a particular product by tuning some parameters inside its evaluation function. A prototype called ‘Handy Broker’ has been implemented in Java and the results obtained from our experiments look promising for m-commerce use.     

Hanseniaspora opuntiae, Saccharomyces cerevisiae, Lactobacillus fermentum, and Acetobacter pasteurianus predominate during well-performed Malaysian cocoa bean box fermentations,underlining the importance of these microbial species for a successful cocoa bean fermentation process

Two spontaneous Malaysian cocoa bean box fermentations (one farm, two plantation plots) were investigated. Physical parameters, microbial community dynamics, yeast and bacterial species diversity [mainly lactic acid bacteria (LAB) and acetic acid bacteria (AAB)], and metabolite kinetics were monitored, and chocolates were produced from the respective fermented dry cocoa beans. Similar microbial growth and metabolite profiles were obtained for the two fermentations. Low concentrations of citric acid were found in the fresh pulp, revealing low acidity of the raw material. The main end-products of the catabolism of the pulp substrates glucose, fructose, and citric acid by yeasts, LAB, and AAB were ethanol, lactic acid, acetic acid, and/or mannitol. Hanseniaspora opuntiae, Lactobacillus fermentum, and Acetobacter pasteurianus were the prevalent species of the two fermentations. Saccharomyces cerevisiae, Lactobacillus plantarum, Lactobacillus pentosus, and Acetobacter ghanensis were also found during the mid-phase of the fermentation processes. Leuconostoc pseudomesenteroides and Acetobacter senegalensis were among the prevailing species during the initial phase of the fermentations. Tatumella saanichensis and Enterobacter sp. were present in the beginning of the fermentations and they could be responsible for the degradation of citric acid and/or the production of gluconic acid and lactic acid, respectively. The presence of facultative heterofermentative LAB during the fermentations caused a high production of lactic acid. Finally, as these fermentations were carried out with high-quality raw material and were characterised by a restricted microbial species diversity, resulting in successfully fermented dry cocoa beans and good chocolates produced thereof, it is likely that the prevailing species H. opuntiae, S. cerevisiae, Lb. fermentum, and A. pasteurianus were responsible for it.     

安徽某复杂多金属铜铅锌矿石综合回收试验研究

针对安徽某多金属共生复杂硫化铜铅锌矿石特点,通过系统的试验研究,确定了分选工艺流程,使矿石中铅、锌、铜、金、银得到了综合回收,选矿指标先进,为该矿山开发奠定了技术基础,为企业决策提供了科学依据。     

重力场中铝热剂的燃烧特性研究

研究了重力场作用下有液相生成的铝热剂的燃烧特性。研究了CaO,CaF2等添加剂以及预热温度对铝热剂燃烧温度和燃烧速率的影响。结果表明,在重力作用下有液相生成的铝热剂的燃烧速率为反应产物熔体未反应粉末中的渗透速率。提高预热温度可使燃烧温度升高,燃烧速率增大。     

数字矿山系统框架与关键技术研究

数字矿山是当今采矿科学、信息科学、人工智能、计算机技术和3S技术发展与高度结合的产物,它将深刻改变传统的采矿生产活动和人们的生活方式。分析了数字矿山的内涵和基本特征,对数字矿山的层次结构和系统框架进行了研究,讨论了数字矿山战略实施的关键技术,并对数字矿山的发展前景做了初步的展望。     

Analysis of etched long-period fibre grating and its response to external refractive index

Analytical formulas are presented for the first time to describe the shift in the resonance wavelength of a long-period fibre grating (LPFG) in response to etching of the fibre cladding or a change in the external refractive index. The accuracy of the formulas is confirmed by comparison with numerical simulations and experimental results. It is shown that the resonance wavelengths of an etched LPFG are more sensitive to the external refractive index than those of an unetched grating.     

A general approach for analysis and application of discretemultiwavelet transforms

This paper proposes a general paradigm for the analysis and application of discrete multiwavelet transforms, particularly to image compression. First, we establish the concept of an equivalent scalar (wavelet) filter bank system in which we present an equivalent and sufficient representation of a multiwavelet system of multiplicity r in terms of a set of r equivalent scalar filter banks. This relationship motivates a new measure called the good multifilter properties (GMPs), which define the desirable filter characteristics of the equivalent scalar filters. We then relate the notion of GMPs directly to the matrix filters as necessary eigenvector properties for the refinement masks of a given multiwavelet system. Second, we propose a generalized, efficient, and nonredundant framework for multiwavelet initialization by designing appropriate preanalysis and post-synthesis multirate filtering techniques. Finally, our simulations verified that both orthogonal and biorthogonal multiwavelets that possess GMPs and employ the proposed initialization technique can perform better than the popular scalar wavelets such as Daubechies'D8 wavelet and the D(9/7) wavelet, and some of these multiwavelets achieved this with lower computational complexity