共查询到19条相似文献，搜索用时 171 毫秒
1.
曹承平 《淮南职业技术学院学报》2008,8(3):1-3
通过对影响煤炭自燃因素的分析,建立了采空区内遗煤自燃过程数学模型,可随时预测不同漏风强度和不同推进速度条件下,采空区遗煤自然发火的危险性,对丁集煤矿1262（1）首采面采空区遗煤自燃过程中,氧化时间、工作面推进速度对煤温的影响进行了计算机模拟,成功预报了在回采过程中采空区遗煤不自燃,确保了该工作面安全回采。 相似文献
2.
针对皖北煤电集团公司前岭煤矿4333工作面的具体情况,研究了高瓦斯煤层回采工作面的瓦斯涌出来源,对控制采空区瓦斯涌出量进行了论述,介绍了回采工作面上隅角瓦斯管理的几种方法,确保了安全生产,实现了回采工作面稳产高产的综合治理原则。 相似文献
3.
李顺文 《淮南职业技术学院学报》2009,9(2):79-81,84
龙东煤矿7135工作面是龙东煤矿一个较短的综合放顶开采工作面,该工作面断层较多,煤层自燃倾向性较高,开采该煤层发火危险性大,为了确保该工作面安全回采,必须测定煤炭低温氧化过程的基础参数与采空区遗煤氧化三带宽度,掌握该工作面开采过程中采空区煤炭氧化特点及发火的规律性,确定煤炭自燃早期预测手段,制定定综合防灭火措施,确保工作面安全回采。 相似文献
4.
通过分析3623S综采工作面回采过程中存在的采空区内煤炭自燃的问题,提出了对该工作面采取随采随注的采空区注浆工艺方法。介绍了注浆工艺方法过程,简述了注浆工艺过程的控制,总结了注浆工艺过程的注意事项,分析了随采随注采空区注浆工艺效果。 相似文献
5.
王永保 《淮南职业技术学院学报》2003,3(4):46-49
谢一矿为多煤层群联合开拓布置方式,随着矿井开采水平的不断延深,矿井瓦斯涌出量越来越大,瓦斯突出危险将进一步威胁矿井安全生产。因此,加大矿井瓦斯治理力度,强化瓦斯治理治本措施,加强瓦斯抽排,走综合治理之路。介绍了谢一矿454B_(9b)高瓦斯“双突”炮采工作面通过采用高抽巷、低抽巷、采空区抽放、工作面煤体高压浅孔注水瓦斯综合治理的方法,以消除和降低工作面的突出危险性,确保工作面回采推进度,提高回采产量,同时也降低了高瓦斯“双突”工作面及回风流瓦斯、粉尘浓度,改善了工作面工作环境,有效地保证了该工作面安全生产。有效地保证了该工作面安全生产。 相似文献
6.
黄列海 《淮南职业技术学院学报》2006,6(3):18-19
介绍了普通综采支架加大采高回采技术,通过采取预防片帮及片帮伤人、实施综合治理瓦斯、加快工作面推进度等措施,加大了煤炭资源的回收率,为潘三矿在大幅度提高单产,实现高产高效方面积累了成功的经验,同时,也为今后同类条件下加大采高回采提供了可靠的技术保障。 相似文献
7.
王建明 《淮南职业技术学院学报》2007,7(3):10-12
回采工作面通过采用煤层注水挤排瓦斯,降低了回采工作面在割煤期间粉尘量,改善了工作面及上风巷恶劣环境,降低了回采时瓦斯涌出量,使工作面回风流瓦斯浓度小于临界状态,提高了回采工作面生产率,煤层注水工作面得以开展。 相似文献
8.
分析了谢桥矿高瓦斯中厚煤层沿空掘巷瓦斯涌出规律,指出采空区瓦斯涌出是沿空掘巷瓦斯涌出的主要来源,瓦斯涌出量随掘进速度加快而增大,随沿空段长度增加而增加,并受采空区均压条件的变化、沿空煤柱裂隙的增加等因素影响,提出了抑制采空区瓦斯涌出、瓦斯抽放、改变巷道支护方式、加大配风量等有针对性的沿空掘巷瓦斯治理技术,为煤巷沿空快速掘进提供了安全技术保障。 相似文献
9.
王丙迎 《雁北师范学院学报》2013,(4):71-75
屯兰矿12501工作面位于屯兰矿南五盘区,工作面采用倾斜长壁后退式一次采全高全部垮落综合机械化采煤方法。工作面走向长度为1751 m,倾斜长度为199 m,煤层平均厚度3.69 m,煤层倾角为1°-7°。煤层硬度低,稳定程度为较稳定。工作面平均采高4.25米,跟2#煤顶板和3#煤底板向前推进,两端头与巷道平缓过渡。回采工序为双滚筒采煤机割煤、装煤→可弯曲刮板输送机运煤→移架→推移刮板输送机。工作面采用快速沿空留巷＂Y＂型通风方式,即：胶带顺槽、轨道顺槽进风,沿空留巷、南翼边界巷回风。工作面采用＂风排和抽采＂综合瓦斯治理措施,以及＂四位一体＂方法防治煤与瓦斯突出。 相似文献
10.
邹纯阳 《淮南职业技术学院学报》2005,5(3):13-15
为了保证5111（S）C15综采工作面以正常进度安全回采,通过深入现场对该工作面瓦斯主要来源,及构成进行了分析和研究,采取了一系列的瓦斯综合治理措施,提出了加强通风,保证足够风量,加强瓦斯检查,保证瓦斯监测系统正常到运行;采取煤壁浅孔注水,控制生产进度;对于工作面上隅角和架顶瓦斯超限,采用风幛引排处理;这些措施的综合运用效果显著,此工作面已安全回采完毕;对于瓦斯大的工作面需要加大瓦斯治理力度,加强瓦斯抽排,走综合治理之路,才能确保矿井安全生产. 相似文献
11.
煤层注水参数合理选择及防尘效果分析 总被引：3，自引：0，他引：3
综合机械化采煤工作面煤尘严重威胁工作面生产安全，对工作面作业人员的身体带来严重的影响，为保证煤矿安全生产和职工身体健康，2001年新集一矿在1802综合机械化回采工作面首次采用煤层注水工作，通过对煤层注水影响因素的分析，确定煤层注水参数的合理选择，并结合新集一矿的实际在1802综采工作面首次采用该参数进行煤层注水试验，并对工作面回采期间进行煤尘测定，通过对1802综采工作面注水效果分析，取得一定的效果。 相似文献
12.
陆招英 《福建师范大学学报(哲学社会科学版)》2004,(4):83-86
我们用几种韵书比较切下字系统 ,发现有许多字原本属于开口韵歌、哿的字在《集韵》里分别收在合口韵戈、果韵中 ,但切下字却仍用开口字。开合混置的韵字特别多 ,不仅有开口韵放入合口韵 ,而且也有合口韵放入开口韵 ,但切下字系统不变 相似文献
13.
Ronald J. McBeath 《Educational Media International》2013,50(1):36-37
Abstract This is a ‘view from the coalface’ of someone who runs a large company responsible for the training of other member companies of the Group of which it forms a part. He gives examples from the day‐to‐day work of his company, and looks to the future of open and distance learning in the industrial world. 相似文献
14.
《徐仙翰藻》是保留下来的关于元代二徐真人信仰的第一手资料。通过挖掘史料,对《徐仙翰藻》的作者与成书年代、版本源流、基本思想等问题作了较为系统细致的探索,认为《徐仙翰藻》是众人合作的结果,1305年前后陈梦根将其汇编成书;该书有元手抄本、明刊本、现代点校本三种不同版本;《徐仙翰藻》的基本思想是"济生渡死,辅正除邪"。 相似文献
15.
《International Journal of Educational Research》2002,37(5):521-535
This chapter discusses issues that are common across the literatures and makes connections across the different levels of inquiry to develop a conceptual model of peer influences on learning. Based on the premise that compositional effects operate through a nested series of hierarchical layers, the chapter proposes a multi-layered model with effects propagating from school-level influences to class-level influences to group-level influences to ambient and configured environments for learning among peers. It is proposed that many of the effects are indirect. Hence, peer effects ‘look’ smaller the further we move away from the instructional coalface because they are mediated by intervening layers. It is also noted that there may be reciprocal effects whereby peers influence teachers and school organization and management. Finally, the chapter describes four instructional approaches that utilize peer resources to maximize learning. These approaches demonstrate additional ways of capitalizing on peer effects beyond altering student composition. 相似文献
16.
This study uses longitudinal mixed methods data to examine patterns of dropout among a cohort of 1305 Honduran rural youth from the time they were in 6th grade to the age of 20. Based on our analysis of household and student surveys and in-depth interviews, we find that dropout is a major problem, particularly during transition years and during the first year of upper secondary education. Dropout results from the accumulation of push and pull factors that lead students to question whether it is worthwhile to stay enrolled, as they lack opportunities to convert their schooling into valued outcomes. 相似文献
17.
Naonori Kodate Kashiko Kodate Takako Kodate 《European Journal of Engineering Education》2014,39(6):648-665
The phenomenon of women's underrepresentation in engineering is well known. However, the slow progress in achieving better gender equality here compared with other domains has accentuated the ‘numbers’ issue, while the quality aspects have been largely ignored. This study aims to shed light on both these aspects via the lens of mentors, who are at the coalface of guiding female engineers through their education and subsequent careers. Based on data collected from 25 mentors (8 men and 17 women from 8 countries), the paper explores their experiences of being mentors, as well as their views on recommended actions for nurturing female engineers. The findings reveal that the primary motivation for becoming a mentor was personal for men and women. Many mentors from countries with relatively lower female labour participation rates perceive their roles as guarantors of their mentees’ successful future career paths, and a similar trend can be found in mentors in academia. The study underscores the need for invigorating mentors’ roles in order to secure a more equitable future for engineering education. 相似文献
18.
John Hogan 《Perspectives: Policy and Practice in Higher Education》2013,17(2):49-56
Largely unknown to most of the world, Kyrgyzstan has a flourishing higher education (HE) sector, with more universities per head than other countries with similar populations. Kyrgyzstan is also a major regional importer of international students in Central Asia. This paper opens up this understudied country in three ways: first, through a brief analysis of the HE sector in Kyrgyzstan; second, by offering a personal view of life on the HE coalface through the findings of primary interviews with university managers in Kyrgyzstan, and third, by identifying five key contemporary challenges of working in Kyrgyz universities. The paper therefore contributes to the limited academic and practical study of HE in Central Asia by offering a new perspective on contemporary global challenges in HE administration and management. The key findings are relevant to organisations seeking to understand the context of working in the HE sector in Kyrgyzstan, and also to individuals and organisations wishing to deepen their comparative understanding of HE sectors around the world. 相似文献
19.
文章从多起公共消防安全事件中,引出消防部队在舆论引导上感到的压力和危机,认为,消防部队还不能适应信息社会的发展,其实质就是没有很好地满足公民的知情权。要满足公民的知情权,就要在做好公共消防安全事件的基础上,通过主动作为,建设制度,加强沟通,以掌握话语权,为社会安定稳定作出应有的贡献。 相似文献