基于精细化预测的弱突出煤层动态防突技术

针对煤与瓦斯弱突出煤层的高效防突问题,提出了基于精细化突出预测的动态防突技术。该技术首先对即将开拓的工作面进行块段划分,在煤巷掘进过程中对每一块段开展煤与瓦斯突出危险性预测工作,基于突出危险性的预测结果采取相对应的措施,避免了防突措施的盲目性,提高了防突措施的效率。以大河边煤矿7号煤层作为研究对象,开展了煤与瓦斯弱突出煤层的动态防突技术的研究,建立了包含预测区域划分、测试钻孔设计、测试结果综合分析的成套动态防突技术,在保证矿井安全生产的条件下,实现了煤巷安全掘进1 400 m,工作面比原计划提前6个月回采完毕,缓解了矿井采掘接替紧张的局面。     

云化数据中心的节能减排探讨

为研究泵驱动两相复合制冷机组的工作特性,特别是换热性能随工质泵频率和室内外温差的变化规律,搭建泵驱动两相复合制冷机组的实验装置,对其进行了实验研究.在本实验装置中,蒸气压缩制冷模式分别采用2.63 kW压缩机和3.75 kW压缩机作为驱动元件,泵驱动两相冷却模式采用带变频器的工质泵驱动.结果表明：室内温度25℃、室外温度10℃时,机组换热量随工质泵频率先增大后减小,在工质泵频率为35 Hz时达到最大值;能效比（energy efficiency ratio,EER）随工质泵频率初始变化不明显,然后逐渐降低.在室外温度为0~30℃时,实验获得了2种运行模式的性能变化情况和最佳转换温度.

     

钻屑量与钻屑瓦斯解吸指标在防突预测的应用

针对井下复杂环境因素对煤与瓦斯突出危险性预测指标确定的影响和预测指标确定的要求,着重研究了钻屑量与钻屑解吸指标在煤与瓦斯防突中的应用及钻屑瓦斯解吸指标之间的关系,分析了突出危险性预测中影响单指标值测定误差的常见因素,并在此基础上提出了一些指标测定中应该注意的事项和减少误差的措施.     

Spinal Canal and Spinal Cord in Rat Continue to Grow Even after Sexual Maturation: Anatomical Study and Molecular Proposition

Although rodents have been widely used for experimental models of spinal cord diseases, the details of the growth curves of their spinal canal and spinal cord, as well as the molecular mechanism of the growth of adult rat spinal cords remain unavailable. They are particularly important when conducting the experiments of cervical spondylotic myelopathy (CSM), since the disease condition depends on the size of the spinal canal and the spinal cord. Thus, the purposes of the present study were to obtain accurate growth curves for the spinal canal and spinal cord in rats; to define the appropriate age in weeks for their use as a CSM model; and to propose a molecular mechanism of the growth of the adult spinal cord in rats. CT myelography was performed on Lewis rats from 4 weeks to 40 weeks of age. The vertical growth of the spinal canal at C5 reached a plateau after 20 and 12 weeks, and at T8 after 20 and 16 weeks, in males and females, respectively. The vertical growth of the C5 and T8 spinal cord reached a plateau after 24 weeks in both sexes. The vertical space available for the cord (SAC) of C5 and T8 did not significantly change after 8 weeks in either sex. Western blot analyses showed that VEGFA, FGF2, and BDNF were highly expressed in the cervical spinal cords of 4-week-old rats, and that the expression of these growth factors declined as rats grew. These findings indicate that the spinal canal and the spinal cord in rats continue to grow even after sexual maturation and that rats need to be at least 8 weeks of age for use in experimental models of CSM. The present study, in conjunction with recent evidence, proposes the hypothetical model that the growth of rat spinal cord after the postnatal period is mediated at least in part by differentiation of neural progenitor cells and that their differentiation potency is maintained by VEGFA, FGF2, and BDNF.     

综放仰斜开采顶板初跨规律及围巷稳定性研究

通过进行综放工作面仰斜开采顶板初跨规律及围巷稳定性研究,可合理指导回采工作面在初采老顶跨落期间的顶板管理以及合理确定风运两巷超前支护参数、排水巷与切眼间煤柱,为首采工作面围岩结构分析提供了新的思路和方法。     

提高水库水资源的管理与利用

随着经济的发展及社会的进步,城市水资源缺乏问题日益突出.本文运用漫坝风险分析理论,考虑影响漫坝的洪水、风浪、库容、泄水能力4个方面的不确定性,建立了日照水库大坝对抗洪水系列与风浪系列联合作用下的漫坝风险模型,计算水库在现行的防洪标准及调度方案下,大坝对洪水系列与风浪系列共同作用下的漫坝风险及安全可靠度,从而对日照水库漫坝安全做出评价.此外,为了充分利用日照水库上游流域的水资源(包括洪水资源),在保证日照水库大坝漫坝安全可靠度高达99.999%以上的基础上,结合下游河道的泄洪能力、淹没范围等情况,经过比较,提出一个新的水库调度方案,能够使水库在不增加任何工程投资的情况下,显著增加经济效益.     

考虑电动汽车响应AGC的系统网损评估

针对大规模电动汽车参与自动发电控制(automatic generation control,AGC)影响系统网损问题,提出考虑电动汽车响应AGC的系统网损评估方法。首先构建了电动汽车参与AGC框架,根据电动汽车充放电功率等信息,按系统节点估算电动汽车可用容量;然后,提出电动汽车参与AGC的网络节点功率分配方法,并建立考虑电动汽车参与AGC的系统网损评估模型,进行系统网损评估;最后,以IEEE-118节点系统为例进行仿真分析,结果表明,与发电机组参与AGC相比,电动汽车参与AGC,无风电接入时更有利于系统网损维持在一定水平,有风电接入时对系统网损水平影响更大。     

当前我国经济领域犯罪现象探析

在经济全球化和社会转型的背景下,中国经济犯罪形势十分严重,形成大案要案突出、犯罪类型多样化、作案手段隐蔽化、组织化程度高且与腐败相联等特点,呈现出国际化、作案手段高科技化、黑社会形式的经济犯罪加剧等发展趋势。文章针对我国目前经济犯罪的特点,提出了加强经侦队伍业务培训,提高侦办能力,加强情报资料收集和建立统一的经济犯罪情报资料信息网等预防打击对策。     

泄洪闸变速控制系统

为提高泄洪闸的工作可靠性及自动化程度,提出用PLC及变频调速技术对闸门实行变速控制,介绍了系统的工作原理,并进行了总体设计和控制系统设计.经调试、运行证明,该系统方案可行、简单、易于实现.该方法具有普遍意义,可广泛用于闸门的控制.     

装饰防护镀铬工艺的正交试验研究第二部分——装饰镀铬品质异常的原因和处理

分析了装饰镀铬品质异常的原因。提出了预防与处理针孔、麻点、粗糙、烧焦、起皮、裂纹、鼓泡、剥落、镀层厚度不均、CASS试验不合格和生锈变黄等故障的方法。