利用自动解离分析方法研究硫化铜尾矿的矿物学特征:谦比希铜矿尾矿的实例研究

As ore grades constantly decline, more copper tailings, which still contain a considerable amount of unrecovered copper, are expected to be produced as a byproduct of froth flotation. This research reveals the occurrence mechanism of copper minerals in typical copper sulfide tailings using quantitative mineral liberation analysis (MLA) integrated with scanning electron microscopy–energy dispersive spectroscopy (SEM–EDS). A comprehensive mineralogical characterization was carried out, and the results showed that almost all copper minerals were highly disseminated within coarse gangue particles, except for 9.2wt% chalcopyrite that occurred in the 160–180 μm size fraction. The predominant copper-bearing mineral was chalcopyrite, which was closely intergrown with orthoclase and muscovite rather than quartz. The flotation tailings sample still contained 3.28wt% liberated chalcopyrite and 3.13wt% liberated bornite because of their extremely fine granularity. The SEM–EDS analysis further demonstrated that copper minerals mainly occurred as fine dispersed and fully enclosed structures in gangue minerals. The information obtained from this research could offer useful references for recovering residual copper from flotation tailings.     

Collaborative multi-agent reinforcement learning based on experience propagation

For multi-agent reinforcement learning in Markov games, knowledge extraction and sharing are key research problems. State list extracting means to calculate the optimal shared state path from state trajectories with cycles. A state list extracting algorithm checks cyclic state lists of a current state in the state trajectory, condensing the optimal action set of the current state. By reinforcing the optimal action selected, the action policy of cyclic states is optimized gradually. The state list extracting is repeatedly learned and used as the experience knowledge which is shared by teams. Agents speed up the rate of convergence by experience sharing. Competition games of preys and predators are used for the experiments. The results of experiments prove that the proposed algorithms overcome the lack of experience in the initial stage, speed up learning and improve the performance.     

企业数据仓库与决策支持系统

介绍了数据仓库（DW）、联机分析处理（OLAP）和数据挖掘（DM）的概念和功能,提出了将DW,OLAP和DM三种技术相结合的企业决策支持系统结构框架。     

Design hardware calculator in PWM peripherals of nios II with verilog HDL

The Plus Width Module (PWM) in microprocessors is commonly used in motor control field. If the ordinary PWM peripherals output PWM waveform, the software must calculate the period and duty cycle number based on the microprocessor’s system clock cycle first, and then write them into the registers. As all known, the microprocessor without hardware calculator consume very long time in multiplication and division. In order to reduce the CPU’s running time, a calculation hardware unit was designed to calculate the waveform parameters. The software only need to write the period (Hz units) to the period register and the duty cycle (% units)to its register. This hardware unit was designed with Verilog HDL and running in the Nios II system successfully.     

Fabrication of fine spongy nanoporous Ag-Au alloys with improved catalysis properties

Fine NP-AgAu(nanoporous AgAu) alloys with spongy structure was fabricated by chemical dealloying from rapidly solidified amorphous precursors Ag_(38.75-x)Cu_(38.75)Si_(22.5)Au_x(x=0, 0.5, 1 and 5). The results indicate that the addition of small content Au in precursor can refine both the ligaments and pores obviously. Among the present components of the precursors, NP-AgAu alloys dealloying from Ag_(37.75)Cu_(38.75)Si_(22.5)Au_1 had the finest spongy structure. The size of pores was 5–10 nm and the grain size of ligaments was 10–20 nm. It also had the highest surface area of 106.83 m~2g~(-1) and the best catalytic activity towards electro-oxidation of formaldehyde with the peak current of 665 mA mg~(-1).     

图书馆效益及评价方法

分析了图书馆效益及其特点，在此基础上讨论了几种计算图书馆效益的方法。     

The Grey Relational Analysis （GRA） of Influence Factors on Exports in China

There are many factors influencing export in China, such as the supply in domestic market, the market openness in China, the demand in overseas market, exchange rate and so on. Since the late of 1990＇s, non-tariff barriers such as antidumping, safeguard measures and technical barriers to trade （TBT） have become the main factors. We analyze the influence factors and the degree of the influence about exports in China by the Grey Relational Analysis （GRA） and put forward countermeasures for enterprises.     

Correlation between echolocation calls and morphological features among three kinds of bats

The correlation between echolocation sound and morphological features of 18 species of bats, which are subordinated to 3 families including rhinolophidae, hipposideridae and vespertilionidae is studied. Pearson's correlation and regression analysis are adopted to analyze the correlations between noseleaf width (NW) and forearm length (FAL), NW and dominant frequency (DF), FAL and DF. The results show a positive correlation between NW and FAL and a negative correlation between NW and DF in Rhinolophidae. In each family, there is a negative correlation between FAL and DF. Some species have a higher or lower frequency than predicted one according to their body size. There are significant differences of the regression equation of FAL and DF among the three families. For the bats with the same body size, the order in frequency is: hipposiderid bats＞ rhinolophid bats＞ vespertilionid bats. The mechanism of interrelationship between FAL and DF of bats, the reason why these deviations occur in correlativity of the three families and the mechanism of the interaction between morphological, physiological and ecological characteristics are discussed.     

Consistent Estimation of Order for Regression in the Presence of Serial Correlation and Heteroscedasticity

1　 IntroductionIn econometric regression models,serial correlation and heteroscedasticity are twocommonly encoutered features of disturbance behavior and may often occursimultaneously. For example,the effects of omitted variables may give rise to bothproblems simultaneously.Therefore,an econometric regression model where both serialcorrelation and heteroscedasticity are present would be feasible.There are literaturesconcerning efficient estimation of regressions with both serial correlation a…     

二元系的热刺激电流

测量3种不同化学成份的粉料与硅油混合物的热刺激电流。BT粉与硅油的混合物有很明显的热刺激电流（TSC），且显示出粒径存在一定的关系；TiO2粉和AIO3与硅油的混合物在测量温区几乎没有热刺激电流峰。