CuSO4对氰化提金贫液中SCN-的沉淀效果以及对共存离子浓度的影响

针对氰化提金贫液循环利用过程SCN^-积累以及外排带来的环境污染问题，以CuSO₄作为沉淀剂处理某高浓度SCN^-贫液，考察了沉淀剂用量、沉淀时间及沉淀温度对SCN^-沉淀效果和对共存离子浓度的影响。结果表明，当在贫液中加入1.6倍化学反应计量的CuSO₄后于室温搅拌60 min，SCN^-的去除率达87.5%以上，体系中T_Cu、S₂O₃ ^2-和SO₃ ^2-浓度也大幅降低，同时得到纯度达97%以上的CuSCN产品。沉SCN^-后的贫液只需石灰中和并沉部分SO₄ ^2-后，其活性得到进一步恢复，可直接返回金精矿浸出工序充分利用其中的CN^-，实现提金贫液的循环利用。     

我国钼矿床伴生矿产综合勘查评价指标探讨

钼矿是我国优势金属矿种之一,我国钼矿无论是在资源储量还是产量上均在世界上占有重要地位,并且具有矿床规模大、伴生矿产多、综合利用价值高等特点。文章通过对我国几个主要类型典型钼矿床矿石化学分析、选矿试验及矿山实际开采利用资料分析,总结了各类型钼矿床共(伴)生组分组合特点及伴生矿产综合评价常用方法,并结合当前技术经济条件及环境保护要求,对伴生矿产综合评价指标提出了调整建议。     

On Ilyashenko’s statistical attractors

We define a minimal α-observability of Ilyashenko’s statistical attractors. We prove that the space is always full Lebesgue decomposable into pairwise disjoint sets that are Lebesgue-bounded away from zero and included in the basins of a finite family of minimal α-observable statistical attractors. Among other examples, we analyse the Bowen homeomorphisms with non-robust topological heteroclinic cycles. We prove the existence of three types of statistical behaviours for these examples.     

Genes without prominence: a reappraisal of the foundations of biology

The sequencing of the human genome raises two intriguing questions: why has the prediction of the inheritance of common diseases from the presence of abnormal alleles proved so unrewarding in most cases and how can some 25 000 genes generate such a rich complexity evident in the human phenotype? It is proposed that light can be shed on these questions by viewing evolution and organisms as natural processes contingent on the second law of thermodynamics, equivalent to the principle of least action in its original form. Consequently, natural selection acts on variation in any mechanism that consumes energy from the environment rather than on genetic variation. According to this tenet cellular phenotype, represented by a minimum free energy attractor state comprising active gene products, has a causal role in giving rise, by a self-similar process of cell-to-cell interaction, to morphology and functionality in organisms, which, in turn, by a self-similar process entailing Darwin''s proportional numbers are influencing their ecosystems. Thus, genes are merely a means of specifying polypeptides: those that serve free energy consumption in a given surroundings contribute to cellular phenotype as determined by the phenotype. In such natural processes, everything depends on everything else, and phenotypes are emergent properties of their systems.     

共存物质对O3/H2O2工艺降解2,4-D的影响(Ⅱ)氯和过氧化氢动力学分析

为了模拟实际水体中复杂的水质环境,在去离子水配制的溶液里加入少量无机盐、有机物,以及用自来水、地表水配制2,4-D溶液,采用O3/H2O2工艺处理水溶液中2,4-D污染物,通过跟踪反应液内氯离子和过氧化氢的浓度变化,考察共存物质对脱氯和过氧化氢产生分解的影响.实验结果表明,脱氯量小于2,4-D去除量,2,4-D降解过程...     

An artificial neural network noise reduction method for chaotic attractors

A method is presented to reduce noise in chaotic attractors without knowing the underlying maps. The method is based on using Artificial Neural Network (ANN) for moderate levels of additive noise. For high levels of additive noise, a combination of a refinement procedure with ANN is used. In this case, only one refinement is needed for the successful use of ANN. The obtained ANN model is used for long-term predictions of the future behavior of a Henon attractor, using information based only on past values.     

Synchronization of chaotic attractors with different equilibrium points

This paper investigates the synchronization of coupled chaotic systems with many equilibrium points. By addition of an external switching piecewise-constant controller, the system changes to a new one with several independent chaotic attractors in the state space. Then, by addition of a nonlinear state feedback control, the chaos synchronization is presented. This method can be used in many couples of chaotic systems characterized by the same equilibrium point or by two different equilibrium points, even they are the same systems (Lorenz, Jerk, Van der Pol) or two chaotic systems with different structures (Lorenz modified).     

磁性介孔TiO2/氧化石墨烯复合材料的制备及其对U(Ⅵ)的吸附

以氧化石墨烯（GO）、纳米Fe₃O₄、钛酸四丁酯（TBOT）为原料,合成了磁性介孔TiO₂/GO（Fe₃O₄@TiO₂/GO）复合材料,用其处理浓度为10 mg·L-1的含U（Ⅵ）废水。研究了Fe₃O₄@TiO₂/GO复合材料中GO含量、溶液初始pH值、Fe₃O₄@TiO₂/GO复合材料投加量、反应时间、U（Ⅵ）初始浓度及共存离子对U（Ⅵ）吸附的影响。结果表明:在pH值为6、GO质量分数为60wt%、Fe₃O₄@TiO₂/GO复合材料投加量为10 mg的条件下,Fe₃O₄@TiO₂/GO复合材料对U（Ⅵ）的吸附效果最佳,较同等条件下磁性介孔Fe₃O₄@TiO₂复合材料和GO的吸附量分别高了10.99 mg·g-1和1.91 mg·g-1。Fe₃O₄@TiO₂/GO复合材料对U（Ⅵ）的吸附180 min即达到平衡,准二级动力学模型和Freundlich吸附等温模型能很好地描述其吸附过程。解吸实验表明,经5次吸附-解吸后,U（Ⅵ）的吸附率仍高达90.86%,说明Fe₃O₄@TiO₂/GO复合材料具有较高的循环利用性能。