青藏高原东北缘榆木山东缘断裂地表破裂带的新发现及其地震地质意义

榆木山东缘断裂的晚第四纪构造变形及最新的活动特征反映了祁连山的向N扩展过程及印度板块向N挤压的远程碰撞效应。文中结合遥感影像解译、探槽古地震、无人机航空摄影测量和晚第四纪测年等方法,调查并新发现了榆木山东缘断裂的地表破裂带及其活动特征。结果表明,榆木山东缘断裂整体走向NW330°,现今的运动学特征以逆冲为主。以黑河为界,断裂的活动习性存在明显差异。在黑河口段(F_(1-1))发现了全新世晚期最新强震活动的地表破裂带。破裂带整体走向NW330°,倾向SW,长约10km,宽3~10m。地表破裂断错年轻的河流阶地、冲沟及台地,地表陡坎的最大高度为(3.3±0.2)m。光释光年代学结果显示,最新的地表破裂事件发生于(0.6±0.07)ka BP,经验公式估算其震级约为M 7.5。研究结果表明榆木山东缘断裂的变形特征为前展式逆冲推覆,其最新前缘的变形已经到达盆地内部。

桉木锯解技术的发展

传统的跑车带锯、双轴多片圆锯和简单的三面下锯法是中小型桉木加工企业目前普遍采用的锯解设备,同时,高新的智能化锯解技术也逐渐被应用于桉木锯解加工中。根据桉木锯解在加工利用中存在的主要问题,归纳总结了桉木的国内外锯解技术,分析几种下锯方式的优缺点,为提高产品精度和质量提供分析参考,以期为我国桉木加工行业能充分合理利用桉树人工林资源、提高桉木的使用价值提供借鉴。

桉木干燥技术研究现状

为了系统的了解目前桉木干燥技术的现状,本文总结了近年来国内外有关桉木干燥技术研究的进展,归纳了影响桉木干燥的主要因素、干燥缺陷以及解决措施,展望了今后桉木干燥的研究方向,为我国桉木的高值化利用提供理论指导。

某水电站某机组异常振动试验分析及检修

某水电站一号机因水轮机部件磨蚀损坏严重进行了检修,检修后启动时出现了异常振动,机组只能带1/3额定负荷勉强运行。针对该机组在某一工况运行时出现的异常振动现象,进行了一系列稳定性试验。通过试验分析,得知该机组旋转体动平衡特性和电磁力平衡特性良好,该异常振动是由水轮机迷宫不均衡压力激发转动体产生的自激振动,并提出了解决该问题的对策,即通过改变转动体固有频率或改变水轮机流态及其迷宫压力分布消除此振动。通过提出的建议方案检修处理后,机组各负荷工况下运行正常,异常振动消除。

Active tectonic deformation and its seismic-geological signifi cance of boundary faults of the Daxing Uplift and Langgu-Dachang Depression,Beijing Plain,China

Boundary faults of the Daxing Uplift and Langgu-Dachang Depression are located in the southeastern region of the Beijing Plain and directly control the sedimentation,tectonic evolution,and strong seismic activity of the plain.The Sanhe-Pinggu earthquake of Ms 8.0 occurred in 1679,but the active tectonic deformation characteristics of the boundary have been rarely discussed.In this study,the active tectonic deformation characteristics of the Daxing Uplift and Langgu-Dachang Depression boundary rupture were investigated by collecting and analyzing the results of previous works,supplementing three shallow-seismicexploration control lines at locations where the data are lacking,and carrying out borehole combined profi le exploration and optically stimulated luminescence dating at local breakpoints.Results show that the Daxing Uplift and Langgu-Dachang Depression boundary faults constitute an active tectonic deformation zone with~50 km distance between Mafang and Niubaotun towns and then extends to both ends to form a deep and large fault that cuts through the earth’s crust.The activity of the Daxing Uplift eastern boundary fault may be divided into two sections near Anding town,with the early-to-middle Late Pleistocene gradually weakening in the northwest and the Holocene gradually weakening in the southwest.Moreover,the activity of the Xiadian fault may be divided into two sections near the Chaobai River:the Holocene gradually weakening in the northwest and the early-to-middle Late Pleistocene gradually weakening in the southwest.The boundary fault of the Daxing Uplift and Langgu-Dachang Depression has an~43 km seismic gap around Niubaotun town,which has a high risk of Ms 6.0-7.0 earthquakes.This investigation into the active tectonic deformation characteristics of the boundary fault of the Daxing Uplift and Langgu-Dachang Depression is crucial for analyzing the strong earthquake rupture behavior and the future risk of strong earthquakes in this area.It also contributes greatly to the study of the tectonic pattern evolution of the North China Plain and Beijing Plain.

浅谈检测实验室仪器设备的有效管理

针对已通过计量认证实验室的仪器设备如何进行有效管理进行了分析。主要对实验室仪器设备如何进行管理程序制定、合理的采购计划、申购流程、供应商评价、设备验收、建档与标识、周期检定/校准、使用与管理、期间核查、维护保养与维修、降级和报废等进行了论述。