双正交尺度函数的两尺度关系

构造了双正交尺度函数Lk^j（x）与Lk^j^-（x）的两尺度关系。首先给出了双正交尺度函数Lk^j（x）与Lk^j^-（x）的定义以及几个引理,通过这些得到了双正交尺度函数的两尺度关系式。     

Reaction of sodium perborate with a chlorinated cyclic hindered amine (TMP-Cl): I. Quantitative evaluation of active oxygen species in fabric bleaching

The reaction of N-chloro-4-hydroxy-2,2,6,6-tetramethylpiperidine (TMP-Cl) with sodium perborate (PB) was investigated with special reference to the generation of singlet oxygen and the possible application to a new oxidative bleaching process. Generation of the singlet oxygen (¹O₂), the hydroxyl radical (HO·) and superoxide anion radical (O₂·⁻) in the PB/TMP-Cl mixed solution was confirmed by the trapping reagent method. From the results of another experiment, in which the bleaching abilities of each active oxygen species were confirmed, the main active oxygen species contributing to the bleaching of purpurogallin, the skeleton of black tea pigment, in the PB/TMP-Cl system was concluded to be¹O₂.     

Solvent free oxidation of alcohols catalyzed by KMnO4 adsorbed on Kieselguhr

Efficient and selective oxidation of primary and secondary alcohols to the corresponding aldehydes and ketones catalyzed by potassium permanganate supported on Kieselguhr reagent under solvent free conditions are reported.     

海河平原地下水储量变化的重力卫星反演和流域水量平衡

南水北调工程向华北输水与地下水压采的实施,一定程度改变了海河平原供用水格局,影响了海河平原的地下水储量。准确监测地下水储量变化是水安全保障和地下水战略储备的基础。本研究以水资源公报数据为基准,比较了重力卫星(GRACE)不同的信号处理方法和相关产品,反演了2003—2020年海河流域总水储量及其平原区地下水储量变化,分析了海河流域2000—2019年供用水结构变化和水量平衡关系,量化了总水储量变化对流域蒸散发估算的影响。结果表明：GRACE JPL Mascons数据反演的海河平原地下水储量变化与水资源公报数据的决定系数最高;2003—2020年海河平原地下水储量总体分3阶段呈下降趋势,2003—2011年、2012—2015年和2016—2020年的下降速率分别约为-23.9±1.3亿m³/a、-75.5±5.3亿m³/a、-37.3±2.6亿m³/a;在不考虑海河流域年总水储量变化条件下估算的2003—2019年多年平均蒸散量(521 mm/a),与考虑年总水储量变化的多年平均蒸散量(530 mm/a)相差约10 m...     

基于余弦相似度的改进蝴蝶优化算法

针对蝴蝶优化算法（BOA）容易陷入局部最优和收敛性差等问题,提出一种多策略改进的蝴蝶优化算法（MSBOA）。首先引入余弦相似度位置调整策略,通过旋转变化算子和伸缩变换算子进行位置更新,从而有效地保持BOA的种群多样性;其次引入动态切换概率,来平衡BOA局部阶段和全局阶段的转换;最后增加混合惯性权重策略,以提高BOA的收敛速度。使用16个基准测试函数、Wilcoxon检验以及部分CEC2014函数来验证MSBOA的有效性和鲁棒性。仿真实验结果表明,与BOA和其他改进策略BOA及其他群智能算法相比,MSBOA在收敛精度和收敛速度上有明显的提升。     

马钢某轧钢加热炉燃烧控制优化项目实施方案及可行性研究

分析了马钢某钢轧加热炉氧化烧损偏高问题,提出了燃烧控制优化实施方案,并研究了方案的可行性,给出了研究结论和建议。     

NH_4SCN解吸剂对负载Re的D296树脂的解吸影响

为了实现离子交换树脂中吸附离子的高效解离,研究了NH_4SCN解吸剂对负载Re的D296树脂的解吸影响,并探讨了其最优解吸工艺.通过静态实验探讨了解吸时间、解吸温度,以及解吸溶液的浓度和p H值对D296树脂的解吸影响,并测定了相应的解吸曲线.结果表明,NH_4SCN解吸剂对D296树脂的最佳解吸温度为323 K,最佳pH值为10,最佳解吸溶液浓度为100 g·L~(-1).在最佳解吸工艺条件下,反应20 min后,D296树脂中Re的解吸率可达98%以上,且解吸反应为吸热反应.当NH_4SCN解吸剂的流速为2 m L·min~(-1)时,淋洗效果较好.     

ISAR imaging algorithm for targets with the complex motion based on the high-order ambiguity function-Lv's distribution

In ISAR imaging for targets with the complex motion, since the azimuth high order phase terms caused by the time-varying rotation vector will deteriorate the azimuth focusing quality, the traditional RD algorithm and LFM model are not appropriate. Thereby, in the case when the received signal can be modeled as cubic phase signals (CPSs), this paper proposes an ISAR imaging algorithm based on HAF-LVD (high-order ambiguity function-Lv's distribution). First, this algorithm defines a novel double lag parametric instantaneous autocorrelation function, and then applies the scaling operator to remove the coupling and utilizes FFT to achieve the energy accumulation. Finally, the non-searching estimation of the moving parameter and the ISAR images for targets are accomplished by the obtained HAF-LVD. Because of the introduction of the scaling factor, this algorithm can flexibly deal with more changeful and hostile ISAR environment without loss of the anti-noise performance and computational efficiency. Simulation results validate the effectiveness of the ISAR imaging approach.     

Investigation into the flotation response of refractory molybdenum ore to depressant mixtures:A case study

In this paper, bulk flotation followed by separation was investigated to concentrate purified molybdenite product from Jinduicheng molybdenum ores(Shanxi province, China). The bench scale tests mainly focussed on separation of molybdenite from other sulfide minerals using the new type of depressants.The effect of each single depressant, including organic depressant-modified dextrin(MD), P-Nokes reagent(PN) and sodium trithiocarbonate(ST), and their mixtures on galena, chalcopyrite and other sulfide ores, was examined in turn by changing the concentrations used in cleaner flotation tests. Closed circuit experiments were carried out under the optimal condition and satisfying recovery and grade of molybdenite concentrate could be achieved(86.294% and 53.157%, respectively). A potential reagent regime was developed, with more environmental friendly and more economical advantages due to the introduction of modified dextrin.     

混凝-Fenton氧化联合工艺处理有机废水的试验研究

利用多种方法联合处理是废水处理技术的发展方向,通过单因素实验确定了Fenton氧化和混凝处理高浓度有机废水的最佳参数,并进行了联合工艺处理该废水的实验。结果表明:采用Fenton-混凝联合工艺处理高浓度有机废水优于混凝-Fenton法,处理后苯酚含量、CODCr和浊度分别为45.2mg/L、818.2 mg/L和0.1 NTU,去除率分别为95.5%、60.1%和99.9%。