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Table of Content
31 October 2014, Volume 30 Issue 5
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A Preliminary Discuss on the Feasibility Approach to the Recovery of Cassiterite from Tailings Using Knelson Concentrator
YANG Bo, ZHANG Gen-Lin, MA Juan, TONG Xiong
2014, 30(5): 1-4. doi:
10.3969/j.issn.1009-0479.2014.05.001
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In this paper,the applications of the Knelson concentrator at home and abroad and the principle of benefication were presented.According to the recovery status of cassiterite from tin−bearing tailings,taking tin tailings of Yunnan Province as an example,the feasibility approach to applying Knelson concentrator for the recovery of cassiterite in the gravity separation circuit of bearing−tin tailings were discussed and carried out.The result indicated that Knelson concentrator is more efficientthan table concentrator for the recovery of fine−particle cassiterite.The grade and recovery of tin in concentrate are 13.6% and 58.3%.
Research on Seismic Activities Rules on the Area of Coal Seam Thickness Variation
YANG Chun-Dong
2014, 30(5): 5-8. doi:
10.3969/j.issn.1009-0479.2014.05.002
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In order to effectively prevent the rock burst disaster occurred in the area of the variation in thickness of the deep coal seam during mining,a mine stope was considered as engineering practice background.The influence of coal bifurcation and coal seam thickness variation to rock burst was analyzed using the distribution of space and the varied featuresof the energy releasing and vibration frequency in the seismic activities.The results showed that there would be high vibration frequency and low levels of energy releasing before the intense seismic activity occurred.Mine earthquake is active and prone to large energy mineral earthquake in changes in the area of coal seam thickness.The analysis of the “time-space” of mine earthquake can determine the concentration of mine earthquake region and energy accumulation period.Thereby targeted relief scour protection work can be taken in seam thickness variation affected areas.
Discussion of Smelting Technology of Low Nitrogen Steel in Steel Mill
WEI Bao-Sen
2014, 30(5): 9-12. doi:
10.3969/j.issn.1009-0479.2014.05.003
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The thermodynamic and kinetic analysis of increasing nitrogen and nitrogen discharge was done in the molten steel converter process.Combined with a large number of production practice,the influence of combined blown converter system,raw materials adding and collocation,converting process control,discharge control,the steel deoxidation alloying system as well as the throat opening differential pressure to the steel liquid nitrogen were discussed.The relative improvement measures were given.
The Study of Compatibility between Concrete Mixed Steel Slag Powders and Admixtuers
HAN Chang-Ju, ZHANG Yu-Cai, HUANG Lan, SONG Hua
2014, 30(5): 13-18,34. doi:
10.3969/j.issn.1009-0479.2014.05.004
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Based on steel slag as an active admixture for concrete industry,C30 concrete was prepared with waste utilization of steel slag powder and slag powder,which were produced by Yunnan Kunming Steel Industry Development Co.. Mixed concrete and steel slag powder flow ability and slump loss of concrete were studied.Slag powder and naphthalene and polycarboxylate adapt ability were explored.The results demonstrate that the incorporation of slag powder does not affect the suitability of concrete superplasticizer,but helps to reduce the concrete slump loss.
Research of Technology for Travel OD's obtainment Based on Mobile Positioning Data
CHEN Zhen-Ting, RONG Hui, LI Dong-Sheng, NIE Jun-Tang, CHEN Zhan
2014, 30(5): 19-23. doi:
10.3969/j.issn.1009-0479.2014.05.005
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It has become one of the important basic data for intelligent transportation construction about how to get urban residents's travel OD.The traditional way of travel survey relies on manual operation mode,so there is a substantial limitation on the application. With the development of mobile communication technology, the obtainment of travel OD based on mobile positioning technology has become one of the hottest fields of intelligent transportation. On the basis of the mobile communication network andpositioning technology, travelers' historical mobilephone positioning data can be mined and finished. By probability and statistics for the sampling data, the locating cell with different probability can be extracted. It can be established travel OD matrix by the combination of K—OPSA algorithm to obtain the optimal trajectory and get travelers'trip starting and ending point.The experimental results show that this method can effectively get travelers'OD.
Genetic Algorithm Applied for Base Station Planning in Mobile Communications
LUO Yu-Mei, CHEN Wen
2014, 30(5): 24-28. doi:
10.3969/j.issn.1009-0479.2014.05.006
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Research on a Mission—oriented Resource Allocation Approach under Uncertain Efficiency
CHEN Wen, LUO Yu-Mei, ZHOU Shao-Jing
2014, 30(5): 29-34. doi:
10.3969/j.issn.1009-0479.2014.05.007
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According to the performance uncertainty of task—oriented resource allocation problem, a solving frame work is proposed based on multi–dimensional dynamic programming. Deep analysis of the characteristics of the problem, a model is created in the resource constraints, time constraints, and strategies constraints on the problem. It is decomposed into three sub–problems organically on the basis of this model, namely determining the sequence of tasks, assigning resources to tasks and taking up time optimization. Respectively, it applies prior analysis, multidimensional dynamic programming,heuristic optimization method to solve the above three sub–problems. Finally, an example was illustrated to show the feasibility and practicability of the proposed model and framework. The experimental results show that this framework can effectively solve the problem of uncertain effectiveness of resource allocation task–oriented.
Research on Signal Characteristics of GPS Multipath Effects
WANG Jian-Ying, HUANG De-Wu
2014, 30(5): 35-37,47. doi:
10.3969/j.issn.1009-0479.2014.05.008
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GPS multi–path effect is an important error source of GPS survey. It seriously influences the GPS measurement accuracy. Based on the research on multi–path characteristic, the error characteristics of the multi–path effect were analyzed by using the principle of generating multi–path from starting and the function of the multi–path signal. Finally, multi-path effect under different circumstances was given by using simulation, and the multi-path effect with the space-time and value range characteristics was obtained.
Simulation Study of Multipoint Temperature Measurement and Control Based on Proteus
ZENG Xie-Hua, MA Zhi-Cheng, YANG Yu, WANG Xu, XIANG Li-Ping
2014, 30(5): 38-42. doi:
10.3969/j.issn.1009-0479.2014.05.009
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In the Proteus environment, MCS-51 microcontroller was used to detect temperature return signal of multiple DS18B20 temperature sensor, and each of the temperature sensors is set temperature transfinite acousto-optic alarm.This paper focuses on how to read 64ROM serial numbers of DS18B20 temperature sensor in the Proteus environment. The process of program design for multi temperature sensors attached to 1-wire was elaborated.
Multitasking Carried Out in the Industrial Control Using PLC
TAO Min, GUO Yu-Qi
2014, 30(5): 43-47. doi:
10.3969/j.issn.1009-0479.2014.05.010
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In this paper, how to realize multitask parallel processing in PLC, a conventional control equipment, was discussed by analyzing the working principle of PLC and fieldbus systems.Some simple and easy methods were presented.
Research on Cutting Tooth Arrangement in Screw Drum of Shearer
SHAO Lin-Bo
2014, 30(5): 48-51,65. doi:
10.3969/j.issn.1009-0479.2014.05.011
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It is impossible for a work surface of specific area in the design and manufacture of spiral drum Shearer. So when the coal shearer group was used,it was found that because of pick arrangement installed was not suitable for the situation of working face coal seam geological conditions. This caused serious wear of cutting tooth and impact load increased. There is always phenomena of picking on alloy sheet destroyed. In order to solve this problem, a series of experimental studies of “shearer pick arrangement” in the field and analysis has been carried out.
Applied Research of Reliability Theory Used in Slope Stability Analysis:Taking the Yuan-mo Highway Slope K253+(400~560) as Example
WEN Xue-Feng, LI Chuan-Qi, MA Juan
2014, 30(5): 52-56. doi:
10.3969/j.issn.1009-0479.2014.05.012
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Slope engineering has increasingly become a hot and difficult problem in Geotechnical engineering field.The stability of slope engineering is determined by lots of parameters that are not sure.The theory of reliability can combine the random, uncertain parameters in slope engineering with the safety of engineering via mathematical methods. In this paper,the Yuan-mo Highway Slope K253+(400~560) was taken as an example by Bishop method, using limite quilibrium theory to establish the limit state model,and then derive the limit state equation. Then at different times of the slope of the rainfall infiltration cases were analyzed by using a Geo-studio. Reliability analys is for risk evaluation was done by selecting the most unfavorable state.The feasibility of the JC method for slope engineering risk assessment methods was verified.The variables affecting the reliability index were analyzed. Suggestion of strengthen ing the slope should be the main improving soil overall internal friction angle, and then to improve the cohesion of rock and soil slope treatment measures is more effective.
Study on Preparation and Capacities of the Chitosan Microspheres Modified by
β
-cyclodextrin
ZHENG Xiao-Ying
2014, 30(5): 57-60. doi:
10.3969/j.issn.1009-0479.2014.05.013
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The chitosan microspheres immobilized with
β
-cyclodextrin(CDS) were prepared by reversed-phase suspension, crosslinked with epichlorohydin, and the adsorption capacities of the modified microspheres for methyl orange (MO) were studied. The structure of microspheres was characterized by FTIR and SEM. The effects of adsorption conditions, such as time, pH, temperature, the concentration of MO and the CDS microspheres adsorption efficiency. The experimental results suggested that, at pH4.0, adsorption balance time of cross-linking chitosan microspheres was 1h. CDSof microspheres was 2h.Adsorption data were fitted to the Freundlich isothermal equation and second-order kinetic.
Exploratory Factor Analysis on H-index and its Derivative Indexes
DU Xiang, ZHANG Guo-Fei
2014, 30(5): 61-65. doi:
10.3969/j.issn.1009-0479.2014.05.014
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6694 articles in metallurgical science field are selected from SCIE database of web of science platform during 2010 to 2014 for the study. Then, according to the number issued in the big data environment, correlation between the number issued, citations, number of papers cited H index,G index, AR index, R index, A index and Ha index were analyzed by exploratory factor. Finally, the effectiveness of the productive author population and highly cited author population and the correlation among each index were also analyzed.
Applied Research on Projects of Student Dynamic Management Improvement Plan Based on ZOPP
NA Jia, WANG Song-Jiang, HUANG Hui, CAI Chuan-Xiong, LIU Zhen-Nan, LONG Xiao-Bo
2014, 30(5): 66-73. doi:
10.3969/j.issn.1009-0479.2014.05.015
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Goal oriented project planning is an open work system. It is a set of structured mode,causal analysis strategies to identify main problems, and help decision-makers to find out the best strategy to solve or mitigate these problems found.In this study, project-oriented planning theory was introduced. Application of the theory in improvement of college students dynamic management was explored. The method of how to innovate college student dynamic management at present was found out and some constructive counter measures accordingly were also put forward. This work is also an innovative attempt to apply the goal-oriented project planning theory and methods in the field of higher education, which hopes to improve the work efficiency of the college student education and management in the era of new informational media.
Discussion on Construction and Teaching Reform of Higher Vocational Colleges Metal Heat Treatment Production Process Excellent Course
ZHANG Wen-Li, SONG Qun-Ling, CAI Chuan-Xiong, HU Xin
2014, 30(5): 74-80. doi:
10.3969/j.issn.1009-0479.2014.05.016
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The formation of high technique talent training should emphasize comprehensive occupational ability, knowledge, ability and quality to meet the requirements of actual occupation. Implementation of teaching reform is to seize the philosophy education of higher occupational education: taking the employment as the guidance,taking ability as standard. Education ideas are employment oriented in the teaching process. In the construction of excellent courses, the reform of teaching content and teaching method is an important factor to improve teachers'performance, which is the key and difficult point. According to the characteristics of the course, different teaching content adopts different teaching methods to teaching reform,for instance project teaching method,task driven teaching method,discussion method and with practical skills oriented task type teaching method, which achieved better results.
Thought and Reform of Improving Teaching Quality of Experiment Courses in Higher Vocational Education: Taking Carbon Processing Technology as Example
TENG Yu, SONG Qun-Ling, CAI Chuan-Xiong, LI Ying-Juan
2014, 30(5): 81-84. doi:
10.3969/j.issn.1009-0479.2014.05.017
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Thoughts of how to improve teaching quality of experimental courses in higher vocational education was put forward by using carbon processing technology courses in teaching as an example. Through the analysis of the characteristics of vocational college students and the current higher vocational problems existing in the experiment courses, it is concluded that the method of experimental teaching reform, such as how to raise learning interest of students, arranging experiment class period reasonably, adding open experiment and so on, so as to improve the teaching quality of experimental courses.
Research and Practice of Practical Teaching System of Water Science and Engineering
HUANG Xiang-Yang, KANG Qiong-Xian
2014, 30(5): 85-88,92. doi:
10.3969/j.issn.1009-0479.2014.05.018
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According to the 12th Five year development plan of mycollege and positioning for the professional talents drainage science and engineering training, practice teaching reform is introduced including the professional experiments, design and the professional practice.The purpose is to develop and bring up creative talents to serve the oil companies and local economic construction. The characteristic of practical and applied education is highlighted. The practical education system which is adapted to train the applied engineering under graduate talents is also constructed. This system focuses on training strong practical ability and engineering design capabilities of students with the theoretical basis.The training of students in engineering practice and innovation was strengthened in order to adapt to the rapid development of China's water industry and environmental protection industry for high quality talent. Visit practice, project teaching, teaching and student experience construction, other aspects of studio teaching practices and the effectiveness have been studied and attempts. It has proved that this system can im prove the quality of talents cultivation, and can provide references for talents cultivation of civil and environmental students.
Discussion of the Teaching Mode of Higher Vocational Education Building and Decoration Materials Curriculum Reform
CHEN Chun-Hua, YANG Yong-Feng, ZHANG Wei, HE Yun-Mei
2014, 30(5): 89-92. doi:
10.3969/j.issn.1009-0479.2014.05.019
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Building and Decoration Materials is a compulsory course of building decoration engineering and an important foundation of building decoration engineering course. The improvement of teaching quality of the course has a positive role in promoting the professional teaching. According to the teaching status of building decoration materials, the corresponding teaching mode, reform direction and specific methods were put forward. It is hoped that the teaching level of the course can be improved by teaching reform.
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