一种浮动复合型人工鱼巢

一种浮动复合型人工鱼巢，包括浮动框架，在浮动框架的四周设有多个固定装置，并且浮动框架与固定装置之间是采用活动连接，在浮动框架上分布设有多根缆绳，在缆绳的端部固接有沉子，在沉子与浮动框架之间的缆绳上固定连接多个粘附基质，本实用新型提供一种能为产粘性卵鱼类提供产卵场所的浮动复合型人工鱼巢，能有效促进鱼类资源的保护和可持续利用。</p

Dynamic Evolution of Regional Ecological Services Based on TM Remote Sensing

针对传统评估区域生态系统服务价值空间异质性的问题,本研究将TM遥感影像与价值评估法相结合,测算出针对研究区域的当量因子表,并建立了只需遥感影像数据即可快速并较为精准地动态计算区域生态系统服务价值的多元回归模型。文章以北京市永定河、厦门市和青海省不同尺度为例,对该方法评估区域生态系统服务价值的可行性和准确性进行了讨论,以期为生态综合管理提供定量化参考依据。This paper discussed the dynamic evaluating of regional ecological services with remote sensing technique,based on the comprehensive analysis the character of indexes method and currently equivalent method applying to regional ecological services.With the established method in the literature,it discussed the practical possibility for evaluation the temporal and special regional ecological services in Yongding River,Xiamen and Qinghai province.Compared with the traditional static indexes evaluation,our method discussed the possibility of dynamically evolutional evaluation,in order to provide reference of ecosystem management.北京市科学技术委员会“永定河生态修复目标体系研究”(D090409004009003);北京市生态学重点学科项

Homing Research and Realization of Wire Bending Robot

介绍了一种在数控加工中实现高精度机械回零的方法,其为基于PMAC开放式运动控制卡回零模块,并结合非接触式接近开关限位来完成的,通过在弯丝机器人的应用表明,该方法显著提高各数控轴的自动回零精度,同时也提高了零件加工精度,保证了产品的生产效率和生产成本。The paper introduced a new method which can realize home in CNC manufacturing precisely.It was achieved by combining with PMAC(Open movement controller) and non-contact proximity switch.This method not only significantly improved the operation precision of mechanical returning home,but also enhanced the machining accuracy,production efficiency and products quality.The method had been successfully applied to wire bending robot

磁性亚微米复合核壳颗粒及其制备方法和应用

本发明公开了一种磁性亚微米复合核壳颗粒，是以粒径为80nm-800nm的Fe3O4颗粒为磁性内核、以非晶态SiO2为中间壳层和以具有吸附重金属性能的物质为外层壳层的磁性亚微米复合核壳颗粒。本发明还公开了其制备方法，包括：用溶剂热法制备80-800nm的Fe3O4颗粒作为磁性内核，通过硅源试剂在Fe3O4上碱性水解，并通过羟基脱水缩合得到非晶态SiO2中间壳层，再将具有吸附重金属性能的物质通过化学或物理作用包覆在所获得的亚微米球上，得到磁性亚微米核壳颗粒。该亚微米材料对污水中的重金属离子均有较好的吸附性能，并且材料性质稳定，可磁性回收，无二次污染，复合绿色环保的要求