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Corrosion mechanism of magnesia-chromite refractories by ZnO-containing fayalite slags: Effect of funnel glass addition

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International Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1604-1616页

作者： Zhe-nan Jin Jian-fang Lv Hong-ying Yang Zhi-yuan Ma Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China Guangdong Institute of Resource Comprehensive Utilization Guangdong Academy of SciencesGuangzhou 510650China State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals Guangzhou 510650China Guangdong Provincial Key Laboratory of Development and Comprehensive Utilization of Mineral Resources Guangzhou 510650China

An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractories by ZnO-containing fayalite slag, the corrosion behavior of magnesia-chromite refractories in lead smelting slags with different funnel glass additions from 0wt% to 40wt% was tested. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) was used to acquire the microstructural information of the worn refractory samples. Experimental results showed that the corrosion of magnesia-chromite refractory consisted predominantly of the dissolution of MgO into slag. ZnO and FeO reacted with periclase and chromite to form (Zn,Fe,Mg)O solid solution and (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel, respectively. With the addition of funnel glass, the solubility of MgO increased whereas ZnO levels remained stable, thereby resulting in a reduced Mg content and an elevated Zn and Fe content in the (Zn,Fe,Mg)O solid solution and the (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel. Considering the stability of the (Zn,Fe,Mg)O solid solution layer and the penetration depth of the slag, the optimal funnel glass addition for lead smelting was found to be 20wt%.

关键词： funnel glass zinc-containing fayalite slag magnesia-chromite refractory corrosion

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输入时滞非线性系统的新型动态面funnel控制

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控制理论与应用 2022年第8期39卷 1426-1432页

作者：王清华刘烨张桂林李洪芹刘海珊上海工程技术大学电子电气工程学院上海201620 山东科技大学电气与自动化工程学院山东青岛266590

本文针对一类带有输入时滞的不确定非线性系统,提出了新型动态面funnel控制方案.首先设计补偿动态变量将输入时滞系统转换成无时滞的系统,仅需在递归控制的最后一步补偿,从而优化了控制器设计过程.其次,构造funnel函数,使系统的瞬态和... 详细信息

本文针对一类带有输入时滞的不确定非线性系统,提出了新型动态面funnel控制方案.首先设计补偿动态变量将输入时滞系统转换成无时滞的系统,仅需在递归控制的最后一步补偿,从而优化了控制器设计过程.其次,构造funnel函数,使系统的瞬态和稳态跟踪误差被限制在给定边界内.最后,提出新型非线性动态面控制方法,不仅避免了自适应反推控制中的“微分爆炸”问题,而且消除了边界层误差,使得系统的跟踪误差最终渐近收敛到零.理论分析表明该闭环系统的所有信号一致最终有界,仿真结果验证了该控制方案的有效性.

关键词：自适应控制动态面控制输入时滞神经网络 funnel

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Controllable Magnetic Focusing of Cold Atoms on a Chip

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Chinese Physics Letters 2006年第7期23卷 1698-1701页

作者：刘泱恽旻印建平 Key Laboratory for Optically and Magnetic Resonance Spectroscopy Department of Physics East China Normal University Shanghai 200062

We propose a new lens scheme to focus cold atoms by using a controllable inhomogeneous magnetic field from a square current-carrying wire fabricated on a chip. The spatial distributions of the magnetic field are calculated, and the results show that the generated magnetic field is a two-dimensional （2D） quadrupole one and can be used to focus cold atoms or a cold atomic beam. The dynamic processes of cold atoms passing through our square wire layout and its focusing properties are studied by using Monte Carlo simulations. Our study shows that the atomic clouds can be focused effectively by our magnetic lens scheme, and the focal length of the atomic lens and its radius of focused spot can be continuously changed by adjusting the current in the wires.

关键词： BOSE-EINSTEIN CONDENSATION NEUTRAL ATOMS HOLLOW-BEAM LIGHT MICROMANIPULATION FORCES MIRROR OPTICS funnel TRAPS

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Karst and Pseudokarst of the West Kazakhstan (Republic of Kazakhstan)

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International Journal of Geosciences 2014年第2期5卷 131-136页

作者： Kazhmurat M. Akhmedenov Dinmuhammed Zh. Iskaliev Vladim P. Petrishev Department of Geography M. Utemissov West Kazakhstan State University Uralsk Kazakhstan Institute of Steppe (Ural Branch of RAS) Orenburg Russian Federation Scientific Research Institute of Biotechnology and Nature Management West Kazakhstan Agrarian Technical University Named of Zhangir Khan (WKATU) Uralsk Kazakhstan

An analysis of the formation of karst and karst-suffosion forms on the territory of the West Kazakhstan region is presented in this paper. Numerous literary sources were used as the information database for the analysis of the relief features of the West Kazakhstan region. Evaluation of the morphometric features of the collapsed new formations on the basis of materials of our own field research is presented here for the first time. According to the research objectives there were defined localization places of the karst-collapsed phenomena where the reconnaissance field surveys were carried out. Survey points’ localization has been carried out by means of GPS system with the help of 12-channel GPS-receiver of Garmin eTrex model. Geoinformational technology, based on MapInfo 9.5 and ArcGIS 9.2 packages was used for the building of the information and cartographic database. Original thematic maps compiled on the basis of the research results’ analysis have been obtained in this research. The features of the Caspian Basin’s karst landscapes, formed as a result of salt-dome tectonic manifestations (Inder Mountains, Malaya Bogdo Mountain, Bish-Chokho hill) are described in this paper. The important elements of the Caspian Basin salt-dome landscapes are landforms of the karst origin from large karst depressions of the karst-tectonic origin to modern forms of the sulfate karst: sinkholes, wells, polje, knobs (“Kurgantau”), arches, caves and grottoes. Some karst formations have a non-salt-dome origin. Three areas with the collapsed forms that have the karst-suffosion origin have been identified (near Konyr village, Berezovka village and Zhanatalap village). The mechanism of the sinkholes formation is due to the changes of the groundwater regime and the displacement of limestone eluvium as a result of active anthropogenic impacts. The sinkholes occurence near Zhanatalap village, which is located near the Karachaganak oil and gas field, is probably due to the anthropogenic ini

关键词： Geography Geomorphology Relief Karst Pseudokarst Collapses Suffusion Denudation-Karst Karst-Collapsing funnel Ponor Well Trough Keprok Inder Kazakhstan

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