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536 results on '"Zhao, Li-Hua"'

178. A Professional Mode of the Transformation of Sci-tech Achievements in Scientific Research Institutions of Tianjin City

Author

Dong Shugong, Zhao Li-hua, and Fu Qiang

Subjects
Professional Mode, Government, Engineering, business.industry, Mode (statistics), Scientific Research Institutions, lcsh:Social Sciences, lcsh:H, Engineering management, Transformation (function), Industrial technology, Sci-tech Achievements, Engineering ethics, business, Connotation
Abstract

There are too many scientific research institutions in Tianjin, and the scientific research activities are very active. The transformation of Sci-tech achievements is badly in need of a set of suitable and standardized mode, and how to establish this kind of mode is an important problem faced by researchers of Tianjin Sci-tech development. Based on analyzing the situation in Tianjin research activities, the paper proposes a way to solving this problem--the professional mode of the transformation of Sci-tech achievements, illustrates the connotation of the professional mode, and describes the implement environment and the specific operation progress. According to the characteristics of factors in Tianjin, such as society, government, market, industrial technology and so on, the paper designs the professional mode of the transformation of Sci-tech achievements, which is suitable for the characteristics of Tianjin, and which plays an important role in promoting the development of the productive force in science and technology of Tianjin.

Published
2014

185. Crystal structures of two phytohormone signal-transducing α/β hydrolases: karrikin-signaling KAI2 and strigolactone-signaling DWARF14

Author

Zhao, Li-Hua, primary, Zhou, X Edward, additional, Wu, Zhong-Shan, additional, Yi, Wei, additional, Xu, Yong, additional, Li, Suling, additional, Xu, Ting-Hai, additional, Liu, Yue, additional, Chen, Run-Ze, additional, Kovach, Amanda, additional, Kang, Yangyong, additional, Hou, Li, additional, He, Yuanzheng, additional, Xie, Cen, additional, Song, Wanling, additional, Zhong, Dafang, additional, Xu, Yechun, additional, Wang, Yonghong, additional, Li, Jiayang, additional, Zhang, Chenghai, additional, Melcher, Karsten, additional, and Xu, H Eric, additional

Published
2013
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186. Superior machinability of steel enhanced with BN and MnS particles.

Author

Chen, Ya-nan, Bao, Yan-ping, Wang, Min, Cai, Xiao-feng, Wang, Lin-jing, and Zhao, Li-hua

Abstract

The strategy that replacing part of MnS with BN was proposed in order to decrease the sulfur content in sulfur based free-cutting steel. The effects of BN and MnS inclusions on the microstructure and machinability of the steel were systematically investigated. The results show that most of the BN and MnS inclusions exist individually in the steel and only a small amount of them are in a composite state forming either isolated particles or clusters of particles. In the case of multi-phased steel, the theoretical calculation predicts that the volume of large BN particles should be 0.7 times of the volume of large MnS particles. The machinability of this type of BN and MnS alloy steel over a wide range of cutting speeds ranging from a low speed appropriate for drilling to a high speed appropriate for turning is confirmed as being equal to or superior to that of an MnS reference steel, even though the sulfur content in the composite steel is only half that of the MnS steel. The aptitude for cutting effect of 240 ppm nitrogen and 115 ppm boron in the composite steel is demonstrated to be equivalent or even better than 1000 ppm sulfur in MnS free-cutting steel. [ABSTRACT FROM AUTHOR]

Published
2016
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187. Experimental study on sulfur removal from ladle furnace refining slag in hot state by blowing air.

Author

Zhao, Li-hua, Lin, Lu, and Wu, Qi-fan

Abstract

In view of the present problem of sulfur enrichment in the metallurgical recycling process of ladle furnace (LF) refining slag, a simple and efficient method of removing sulfur from this slag was proposed. The proposed method is compatible with current steelmaking processes. Sulfur removal from LF refining slag for SPHC steel (manufactured at a certain steel plant in China) by blowing air in the hot state was studied by using hot-state experiments in a laboratory. The FactSage software, a carbon/sulfur analyzer, and scanning electron microscopy in conjunction with energy-dispersive X-ray spectroscopy were used to test and analyze the sulfur removal effect and to investigate factors influencing sulfur removal rate. The results show that sulfur ions in LF refining slag can be oxidized into SO by O at high temperature by blowing air into molten slag; SO production was observed to reach a maximum with a small amount of blown O when the temperature exceeded 1350°C. At 1370°C and 1400°C, experimental LF refining slag is in the liquid state and exhibits good fluidity; under these conditions, the sulfur removal effect by blowing air is greater than 90wt% after 60 min. High temperature and large air flow rate are beneficial for removing sulfur from LF refining slag; compared with air flow rate, temperature has a greater strongly influences on the sulfur removal. [ABSTRACT FROM AUTHOR]

Published
2016
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188. Coordinated control of carbon and oxygen for ultra-low-carbon interstitial-free steel in a smelting process.

Author

Wang, Min, Bao, Yan-ping, Yang, Quan, Zhao, Li-hua, and Lin, Lu

Abstract

Low residual-free-oxygen before final de-oxidation was beneficial to improving the cleanness of ultra-low-carbon steel. For ultra-low-carbon steel production, the coordinated control of carbon and oxygen is a precondition for achieving low residual oxygen during the Ruhrstahl Heraeus (RH) decarburization process. In this work, we studied the coordinated control of carbon and oxygen for ultra-low-carbon steel during the basic oxygen furnace (BOF) endpoint and RH process using data statistics, multiple linear regressions, and thermodynamics computations. The results showed that the aluminum yield decreased linearly with increasing residual oxygen in liquid steel. When the mass ratio of free oxygen and carbon ([O]/[C]) in liquid steel before RH decarburization was maintained between 1.5 and 2.0 and the carbon range was from 0.030wt% to 0.040wt%, the residual oxygen after RH natural decarburization was low and easily controlled. To satisfy the requirement for RH decarburization, the carbon and free oxygen at the BOF endpoint should be controlled to be between 297 × 10 and 400 × 10 and between 574 × 10 and 775 × 10, respectively, with a temperature of 1695 to 1715°C and a furnace campaign of 1000 to 5000 heats. [ABSTRACT FROM AUTHOR]

Published
2015
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