一种高效溴基液体氧化型杀生剂的研制和应用

在杀生剂领域,以溴为基础的杀生剂已经逐渐为人们所广泛认识,但是长期以来都因为投加使用不便,固体难于溶解、控制和计量,且由于气味较大及价格高等原因让人望而却步。作者重点介绍一种以溴为基础的新型液体无气味杀生剂——BR0M^TM408高效溴基氧化型杀菌剂,并通过工业试验和实际应用取得的数据对其性能等做了详细阐述。     

Synthesis and optimization of new polymeric ionic liquid poly(diallydimethylammonium) bis(trifluoromethane sulfonyl)imde based gel electrolyte films

Polymeric ionic liquid-based gel electrolyte films are a new generation of electrolyte materials for flexible energy storage device applications. In this work, Li-ion conducting gel electrolyte films are prepared with the polymeric ionic liquid poly(diallydimethylammonium) bis(trifluoromethane sulfonyl)imide (poly(DADMATFSI)) as the host polymer and the lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt as the dopant. The crystalline nature, thermal stability, ionic conductivity and electrochemical stability window of the polymeric electrolyte films are analyzed by various characterization techniques. It is found that the polymeric electrolyte films exhibit high flexibility and excellent thermal stability. Their room-temperature electrical conductivity increases with increasing LiTFSI concentration and reaches a high value of 1.00 × 10^?3 S cm^?1 at 20 wt% LiTFSI. The ionic transference numbers of the polymeric electrolyte films are in the range of 0.98–0.99, indicating that they are perfect ion conductors. Finally, the electrochemical stability window of the 20 wt% LiTFSI-doped polymeric electrolyte film is determined as approximately 6 V, which is a promising value for flexible energy storage device applications.     

原料配比对Y型分子筛成型抗压强度及吸附性能的影响

研究了Y型分子筛成型过程中成型剂含量、胶溶剂种类及含量、黏合剂种类及含量对分子筛抗压强度的影响.结果表明,Y分子筛成型的最佳工艺条件是:成型剂田菁粉加入量(质量分数)为2%,黏合剂羧甲基纤维素钠加入量为0.3%、胶溶剂硝酸质量分数为8%,水粉质量比为0.85,在以上成型条件下Y分子筛抗压强度为9.68 N/mm,达到工业要求.成型后产品在0.1 MPa下,对CO_2、N_2吸附量分别为11.63%、10.31%,静态水吸附量为15.71%.     

船舶鲁棒控制及仿真系统研究

采用ＶＢ和Ｍａｔｌａｂ混合编程技术,通过文件传送数据,通过仿人击键事件传达命令,开发了船舶鲁棒控制及仿真系统。该系统有“船舶模型”、“鲁棒控制算法”和“仿真”等五个模块,采用开放交互式设计结构,可随时更改设计及仿真参数,无需要改任何程序。研究了船舶鲁棒控制策略,并完成了回路成形、μ分析及鲁棒积分等五种鲁棒控制算法的标准Ｍａｔｌａｂ软件包实现,并针对每种算法,给出了实际的鲁棒控制算法设计及仿真示例。     

In situ TEM investigation of congruent phase transition and structural evolution of nanostructured silicon/carbon anode for lithium ion batteries

It is well-known that upon lithiation, both crystalline and amorphous Si transform to an armorphous Li(x)Si phase, which subsequently crystallizes to a (Li, Si) crystalline compound, either Li(15)Si(4) or Li(22)Si(5). Presently, the detailed atomistic mechanism of this phase transformation and the degradation process in nanostructured Si are not fully understood. Here, we report the phase transformation characteristic and microstructural evolution of a specially designed amorphous silicon (a-Si) coated carbon nanofiber (CNF) composite during the charge/discharge process using in situ transmission electron microscopy and density function theory molecular dynamic calculation. We found the crystallization of Li(15)Si(4) from amorphous Li(x)Si is a spontaneous, congruent phase transition process without phase separation or large-scale atomic motion, which is drastically different from what is expected from a classic nucleation and growth process. The a-Si layer is strongly bonded to the CNF and no spallation or cracking is observed during the early stages of cyclic charge/discharge. Reversible volume expansion/contraction upon charge/discharge is fully accommodated along the radial direction. However, with progressive cycling, damage in the form of surface roughness was gradually accumulated on the coating layer, which is believed to be the mechanism for the eventual capacity fade of the composite anode during long-term charge/discharge cycling.     

基于不同排水片区的低影响开发措施优化方案选取

以福建省龙岩市中心城区为例,运用SWMM模型中的LID模块,模拟分析了10%的雨水花园、20%的绿色屋顶、15%的渗透铺装以及一项组合措施(包括3%的雨水花园、7%的绿色屋顶和5%的渗透铺装)对研究区上、中、下游典型排水片区(依次记为A、B、C)的径流总量、洪峰流量及污染物负荷的削减控制效果,包括削减效率及对降水历时的敏感性。通过分配指标权重对各LID措施效果进行综合评价,最终确定各排水片区的LID最佳布设方案。研究结果表明:A片区优选绿色屋顶方案,B片区优选组合措施方案,C片区优选雨水花园方案。     

不同生物有机肥对烤烟生长发育及产质量的影响

为保护植烟土壤生态环境,提高烟叶质量,确保烟叶安全性,对不同生物有机肥对烤烟生长发育及产质量的影响进行了研究。结果表明,使用菜枯、清江源和金丰叶生物有机肥可促进烟株中上部叶开片,增强烟株抗病性,提高烟叶产量和产值,产量分别提高361.35、218.85和17.55 kg/hm²,产值分别增加7744.95、4838.40和2257.80元/hm²,改善初烤烟叶化学成分,提高烟叶综合品质,降低下部叶烟碱含量。清江源生物有机肥在恩施烟区烟叶生产中使用效果较理想。     

基于微波层析成像的活立木内部缺陷检测

活立木中的腐烂和空洞通常是造成树木倒塌的重要原因,通过检测活立木内部结构来判断木材内部的缺陷。针对此现状,提出基于微波层析成像的活立木内部缺陷检测方法。首先搭建由16个天线组成的微波层析成像系统,在1 GHz的频率下模拟健康木材和两种不同缺陷的木材模型,通过有限元分析软件模拟活立木内部的电场特性,得到用于图像重建的散射场,采用线性反投影图像重建算法重建木材内部的介电常数分布图。然后使用平均结构相似性指数分析重建图像。最后对不同的树干模型和重建图像进行定性和定量分析。仿真结果表明,微波层析成像技术可以利用重建介电常数分布图的可视化效果直接识别缺陷的位置和大小等。     

徐州市城郊雾霾天气中PM_(2.5)物化及微生物特征分析

选择雾霾天气对徐州市城郊大气PM_(2.5)采样,利用SEM/EDS对采集后PM_(2.5)颗粒物的物化特性进行分析,并利用DGGE法分析PM_(2.5)颗粒物上微生物的群落结构。结果表明:滤膜上PM_(2.5)大多为亚微米系颗粒物,颗粒物多数表面光滑无棱角,存在C、O、S、Si、Al、K、Na、Ca、Mg、Fe等元素;PM_(2.5)中的微生物种群分属于3个细菌类群:壁厚菌门,β变形细菌门和绿弯菌门。     

联合基础振动模型及动力特性的研究

提出一种刚体－－弹性体联合基础振动模型，用于大型动力机器联合基础的动力分析，对联合基础的自振频率，振型、减振效果以及在不同相拉扰力作用下的响应等动力特性进行了研究。