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Phase Composition Analysis of TiN-AI_2O_3Synthesized from Aluminum-containing Dross and Rutile by Aluminothermic Reductionnitridation Method

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China's Refractories 2014年第3期23卷 40-43页

作者： LIU Haitao MIN Xin JI Haipeng XU Youguo FANG Minghao LIU Yangai HUANG Zhaohui School of Materials Science and Technology China University of Geosciences(Beijing)

TiN- Al2O3 composite powder was prepared by aluminothermic reduction- nitridation method with starting materials of aluminum-containing dross and rutile,and metallic aluminum in the aluminum-containing dross as reducer. The influences of synthesis temperature（600-1 400 ℃） and aluminum-containing dross addition（20% lower than theoretical value,theoretical value,20% higher than theoretical value,and 50% higher than theoretical value） on phase compositions and microstructure of the composites were investigated,and the reaction mechanism was analyzed. The results show that（1） TiN- Al2O3 composite powder can be synthesized under the experimental conditions; the main phases are TiN,α-Al2O3,a little bytownite,and MgAl2O4;（2）enhancing synthesis temperature or increasing aluminumcontaining dross addition favors the reaction of aluminothermic reduction- nitridation;（3） in the synthesized products,α-Al2O3 is platy or columnar; TiN is sub-micron granular,which reinforces and toughens the composite.

关键词： aluminum-containing dross futile alumi-nothermic reduction - nitridation titanium nitride -alurnina composite powder phase compositions

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Preparation of Ti-rich material from titanium slag by activation roasting followed by acid leaching

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Transactions of Nonferrous Metals Society of China 2013年第4期23卷 1174-1178页

作者：刘水石郭宇峰邱冠周姜涛陈凤中南大学资源加工与生物工程学院长沙410083

A method of activation roasting followed by acid leaching using titanium slag was introduced to prepare Ti-rich material. The effects of HaPO4 dosage, roasting temperature, and roasting time on TiO2 grade were investigated. A Ti-rich material containing 88.54% TiO2, 0.42% （CaO＋MgO） was obtained when finely ground titanium slag was roasted with 7.5% H3PO4 at 1000 ℃ for 2 h, followed by a two-stage leaching in boiling dilute sulfuric acid for 2 h. The XRD patterns show that the product is titanium dioxide with a rutile structure. Mechanism studies show that structures of anosovite solid solution and silicate minerals are destroyed in the roasting process. As a result, titanium components in titanium slag are transformed into TiO2 （futile） while impurities are transformed into acid-soluble phosphate and quartz.

关键词： titanium slag activation roasting acid leaching Ti-rich material futile

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The Impact of Health Care Reform Initiatives on Ethical Conflict and Opportunities for Nurses to Improve Quality of Care While Enhancing Their Work Environments

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Open Journal of Nursing 2014年第9期4卷 644-655页

作者： Robert Cooper Garry Frank Cherry Shogren College of Business and Public Administration Drake University Des Moines USA Professional Development Unity Point Health-Des Moines Des Moines USA

Background: After more than a decade of the nursing profession contending that healthcare reform based almost exclusively on cost cutting was creating an array of serious ethical issues for nurses, healthcare organizations and other providers are now facing increasing demands primarily from payers to demonstrate improvement in both quality of care and patient experience along with continued cost reduction. Research Question: Have efforts by healthcare organizations to comply with these recently imposed requirements influenced the ethical environment faced by nurses and nurse leaders and if so, how? Materials and Methods: Data for assessing the current ethical environment was gathered with a close-ended survey mailed in October 2012 to a random sample of 3000 members of the American Organization of Nurse Executives. Results and Discussion: Statistical analysis of the data and comparison with the findings of a similar study conducted in 2000 indicated that along with five highly rated issues in the earlier study attributed largely to economic constraints imposed by healthcare organizations, the top-10 key ethical issues today included five issues primarily attributable to interprofessional conflict. Conclusion: Given the success of many ongoing efforts aimed at weakening these key sources of ethical conflict that have blocked many proposals to improve the quality of care, opportunities should arise for the nursing profession to more fully achieve its goals of improving the quality of care, safety and patient satisfaction and enhancing nurses’ work environments essential to that effort.

关键词： Cost Control End-of-Life Care Ethical Consults futile Treatment Healthcare Reform Nursing Ethics Patient Satisfaction Quality of Care

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Application of ESR Technique to Distinguish the Phase and Size of TiO_2 Powders

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Journal of Electronic Science and Technology of China 2010年第1期8卷 31-34页

作者： Kheamrutai Thamaphat Weeranut Kaewwiset Pichet Limsuwan Department of Physics Faculty of ScienceKing Mongkut's University of Technology ThonburiBangmodBangkok 10140Thailand

The commercial TiO2 nanopowder and micropowder of anatase phase and rutile phase have been characterized by X-ray diffraction （XRD） and electron spin resonance （ESR） spectroscopy. XRD patterns and ESR spectra of nano-TiO2 in rutile and anatase phases exhibit broad peaks whereas both phases of micro-TiOz demonstrate very sharp peaks. Furthermore, the anatase phase of both particle sizes provide ESR peak at a magnetic field around 3568.25G, On the other hand, this peak is not established in the rutile phase of both particle sizes.

关键词： Anatase electron spin resonance(ESR) nanopowder futile titanium dioxide.

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Four Lessons Washington Needs to Learn From Its Trade War With China

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Beijing Review 2019年第37期62卷 38-39页

Students in many parts of the world are heading back to school for a new semester. In the same vain, it is also time for trade trade hawks in Washington to start learning at least four lessons from their futile trade ... 详细信息

关键词： Four Lessons Trade War futile

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