麦草浆无氯漂白的研究

本文对麦草浆无氯漂白的可漂性能进行了研究，指出在保持纸浆具有良好的粘度下，用常规氧碱漂白和强化氧碱漂白分别可脱除残余木素达５０％和７０％以上，纸浆的白度可分别达到３８％ＩＳＯ和４９％ＩＳＯ左右。常规氧漂浆再用过氧化氢强化的氧漂继而可多脱除２０％～３０％的残余木素，纸浆白度高达６０％～６５％ＩＳＯ。麦草浆用ＴＣＦ漂白流程如ＯＯ／ＰＰ，在最终过氧化氢漂段的过氧化氢用量为２．０％时，可获得白度为７５％～８０％ＩＳＯ的纸浆，若采用单段带压的氧气和过氧化氢漂白，可将氧漂浆和本色浆漂到８０％ＩＳＯ的白度，且过氧化氢用量达３．５％～５．０％。考虑到ＴＣＦ漂白废水可逆流回用到碱回收，消除了漂白废水的污染，从而使漂白车间无废水排放。     

An automated method for navigation assessment for Earth survey sensors using island targets

An automated method has been developed for performing navigation assessment on satellite-based Earth sensor data. The method utilizes islands as targets which can be readily located in the sensor data and identified with reference locations. The essential elements are an algorithm for classifying the sensor data according to source, a reference catalogue of island locations, and a robust pattern-matching algorithm for island identification. The algorithms were developed and tested for the Sea-viewing Wide Field-of-view Sensor (SeaWiFS), an ocean colour sensor. This method will allow navigation error statistics to be automatically generated for large numbers of points, supporting analysis over large spatial and temporal ranges.