Characterization and methanol adsorption of walnut-shell activated carbon prepared by KOH activation

Walnut-shellactivated carbons(WSACs)were prepared by the KOH chemicalactivation.The effects of carbonization temperature,activation temperature,and ratio of KOH to chars on the pore development of WSACs were investigated.Fourier transform infrared spectroscopy(FTIR),X-ray powder diffraction(XRD),and scanning electron microscopy(SEM)were employed to characterize the microstructure and morphology of WSACs.Methanoladsorption performance onto the optimalWSAC and the coal-based AC were also investigated.The results show that the optimalpreparation conditions are a carbonization temperature of 700 ℃,an activation temperature of 700 ℃,and a mass ratio of 3.The BET surface area,the micropore volume,and the micropore volume percentage of the optimalWASC are 1636 m~2/g,0.641 cm~3/g and 81.97%,respectively.There are a lot of micropores and a certain amount of meso-and macropores.The characteristics of the amorphous state are identified.The results show that the optimalWSAC is favorable for methanoladsorption.The equilibrium adsorption capacity of the optimalWSAC is 248.02mg/g.It is shown that the equilibrium adsorption capacity of the optimalWSAC is almost equivalent to that of the common activated carbon.Therefore the optimalWSAC could be a potentialadsorbent for the solar energy adsorption refrigeration cycle.     

免费翻译工具中的全能王——谷歌金山词霸合作版

●金山词霸有史以来第一个完全免费的版本今年五月,金山软件与全球最大的搜索引擎公司谷歌(Google)联合推出品牌产品"谷歌金山词霸","谷歌金山词霸"于是就成了金山词霸十二年发展历程中     

基带池技术在航天测控和数传系统的应用

本文针对传统航天测控与数传系统业务中基带设备套量繁多、专用性强、互替换性差^[1]、设备备份链路复杂、系统扩容升级改造不便等缺点,研究了基带池技术的设计理念和关键技术要求,并提出了一种基于基带池技术的设计架构和方案,基本的基带处理资源和颗粒可按需进行动态分配和部署,从而有效提高卫星地面测控和数传通信资源的利用率,且便于维护和扩容。     

Effect of rare earth addition on Cu-Fe/AC adsorbents for phosphine adsorption from yellow phosphorous tail gas

Phosphine(PH3) is a highly toxic air pollutant,commonly produced in phosphorous chemical industry.But it has received less research attention due to its handling difficultly.CO is the main content of the phosphorous chemical industry tail gas,the concentration of which is always more than 80 vol.%,and it can be the feed gas to produce various valuable products such as formate,oxalate,and methanol and so on.But,PH3 is one of the important barriers,which is harmful to the following chemical process.In order to make use of the tail gas,PH3 should be removed firstly,and CO should be covered in the whole purified procedure at the same time.In this work,the modified activated carbon(MAC) was used as the adsorbent to separate PH3 from the mixture tail gas.Series of MAC adsorbents were prepared for the adsorption of PH3,which loaded Cu-Fe and Ce(La),or separately.The PH3 adsorption capacities,chemical and physical properties of MAC were all investigated.The results showed that over 99% PH3 adsorption efficiency was achieved when used MAC adsorbents.The removal efficiency and PH3 adsorption capacity of the Cu-Fe-Ce/AC(20:1:0.4) were both much higher than those modified activated carbons.The maximum PH3 adsorption capacity was 71 mg of PH3/g of MAC on the Cu-Fe-Ce/AC,which were much higher than literature data using CuO only for adsorbing hydride gases.     

基于SOM网络的服装号型设置

以MATLAB平台为基础,利用神经网络工具箱构建了自组织神经网络,对测量的1860组样本数据进行SOM聚类,并用轮廓系数对聚类结果进行评价.指出在无监督聚类分析中,SOM聚类方法操作过程简便易行,具有残缺自动识别能力,分类结果唯一,可以在服装号型设置中应用.     

水力喷射压裂工艺在水平井的应用

水力喷射压裂工艺包括水力喷砂射孔、水力喷射压裂、停泵裂缝闭合、压裂液返排4个阶段。该工艺首先在老井选层压裂施工中应用取得了成功,避免了下桥塞、下顶封、验串等繁琐工序,工艺简单、成本低廉,安全可靠。多级水力喷射压裂工艺在水平井中的成功应用,实现一趟管柱多级水力喷砂射孔,不仅具有以上优势,还节省射孔费用。此技术在二连地区的广泛应用,取得了理想的压裂成果。     

初探建筑工程地质勘察技术

本文通过分析工程地质勘察特点,分析了工程勘察中常出现的问题,提出做好工程地质勘察的有效措施,以确保勘察和设计的质量.     

固氮作物紫云英苜蓿叶象甲药剂筛选试验初探

为有效防治危害紫云英的苜蓿叶象甲,笔者测定了5种杀虫剂对叶象甲的田间防治效果.结果表明,每667 m2喷施10％联苯菊酯乳油30 mL防治苜蓿叶象甲幼虫,速效性和持效性优异,药后7 d和14 d的平均防效分别为92.2％和98.2％;喷施60 g/L乙基多杀菌素悬浮剂30 mL和4.5％高效氯氰菊酯乳油30 mL的防效...     

机插秧田杂草防除试验研究

2013年进行了机插秧田杂草防除试验研究。结果表明:55%吡嘧·丙草胺WP 1125.0 g/hm2封闭效果最理想,药后20,45 d,封闭综合防效分别为93.75%、92.63%,与55%吡嘧·丙草胺WP 750.0~937.5 g/hm2的防效54.38%~75.00%、51.48%~72.88%及对照药剂50%苄·丁·异丙隆WP 1200.0 g/hm2、53%苄嘧·苯噻酰WP 1200.0 g/hm2的防效76.87%~87.50%、72.07%~85.31%差异极显著。在试验剂量条件下,药剂对水稻安全。