用雷达海杂波反演蒸发波导的蚁群算法

针对传统算法在实现雷达海杂波反演蒸发波导参数时表现出寻优慢、收敛早熟的现象,引入了具有更好寻优力的蚁群算法来实现反演过程。分析了利用雷达海杂波反演大气波导的基本原理流程;列出了用于函数优化的蚁群算法的原理。将蚁群算法与雷达海杂波反演大气波导的思路相结合,完成了对蒸发波导的反演。     

考虑竖向附加力时井壁应力计算方法

在考虑竖向附加力作用时，井壁结构的设计计算应按空间轴对称问题考虑。在运用迭加原理求得了井壁应力的计算公式后，又编制了空间轴对称问题的有限元程序，通过计算发现，两者的误差很小，都可应用于井壁结构的设计计算。     

谈浮选回路设计中的几个问题

根据生产实践,对浮选工艺流程设计中经常遇到的几个问题药剂添加的地点及方式,有用矿物的分速浮选,浮选"短路”的问题及磨矿回路中采用选别工艺的情况提出了看法.     

Chemoselective Hydrogenation of α,β‐Unsaturated Nitriles

The chemoselective hydrogenation of cinnamonitrile to 3‐phenylallylamine proceeds with up to 80% selectivity at conversions of >90% with Raney cobalt and up to 60% selectivity with Raney nickel catalysts. Best results were obtained with a doped Raney cobalt catalyst (RaCo/Cr/Ni/Fe 2724) in ammonia saturated methanol at 100 °C and 80 bar. Major problems are the formation of hydrocinnamonitrile and of secondary amines, and overreduction to 3‐phenylpropylamine. Important parameters are the catalyst type and composition, the solvent type and the presence and concentration of ammonia. The catalytic system tolerates functional groups like OH, OMe, Cl, CO, but not aromatic nitro groups. Preliminary experiments indicate that other unsaturated nitriles with di‐ or trisubstituted CC bonds are also suitable substrates.     

五元体系NaOH-Na_2CO_3-Na_2SO_4-NaCl-H_2O 150℃下的相平衡研究

利用本文提出的高温水盐体系相平衡研究试验装置,测定了150℃下NaOH-Na_2SO_3-Na_2sO_4-NaCl-H_2O五元体系的相平衡数据,结合文献数据绘制了完整的150℃下该五元体系的相图,并进行了以内蒙古天然碱为原料采用苛化法生产烧碱蒸发过程的相图计算.     

EVAPORATION RATE OF SnS FROM SLAGS

Under inert atmospheres and 1473 K,the evaporation rate of SnS from SnO-FeO-SiO_2 and SnO-FeO-CaO-SiO_2 slags mixed with FeS was investigated by measuringthe weight Ioss and composition of samples.The experimental results show that dur-ing sulfide fuming process the evaporation of SnOfrom slags is negligible in comparisonwith that of SnS.Addition of CaOto slags can enhance the evaporation rate of SnS.Thedifferential rate equation of evaporation may be expressed as:-d(%Sn)/dt=k(%Sn)(%S)where,the apparent rate constant k was found to be 4.20×10~(-3) for SnO-FeO-CaO-SiO_2 system and 2.88×10~(-3) for SnO-FeO-SiO_2 system,respectively.     

CONCENTRATION DISTRIBUTION OF ALLOYING ELEMENTS IN SURFACE LAYER OF Ti ALLOY MELTS

The concentration distribution of alloying elements such as Al,Sn,V,Si and Mo in surfacelayer of quenched Ti alloy melts(TC4,TA 7 and TC9)has been determined by EPMA.Ti al-loy samples were melted and evaporized by electron beam in water cooled copper curcible.Theactivity coefficient of alloy elements in Ti alloy melts are:γ_(Al)=0.009—0.018 and γ_(Sn)=0.066—0.123 at 1921—2106℃;γ_V=0.713 at 2021℃;γ_(Si)=0.020 and γ_(Mo)=0.913 at 1921℃.Therate controlling steps of the evaporation of alloying elements Al,Sn,V,Si and Mo from Ti al-loy melts have been discussed with the data of evaporation activation energies of such alloy el-ements.     

电解电渗析法制备硅溶胶

以RuO_x／Ti为阳极、铁镀镍为阴极与Nafion901阳离子交换膜组装成两室的电解电渗析槽,探讨了电解电渗析法制备硅溶胶过程中槽电压和pH值变化的基本规律,证实了增大电流密度和阳极液的进料液流速率可减少二氧化硅在阳极上的吸附沉积,增大二氧化硅的收率．在滴加操作中,通过实验找到了制备浓硅溶胶的较佳的初始组成和操作条件,基本上解决了二氧化硅在阳极上的沉积问题,最高槽电压不超过10V,最高电流密度可达150mA·cm~(-2),膜的平均电流效率在93％左右．     

一种经改进的测定有机试剂中微量水方法

采用气相色谱多次标准加入法测定有机试剂中微量水的含量,比单次标准另入法准确度高,其回收率在９９％～１０１％之间。     

加粉带极埋弧堆焊工艺

加粉带极堆焊既发挥了带极堆焊高效率的优势,又解决了合金元素含量多时带极轧制困难的问题。就该工艺方法各工艺参数的匹配关系与选择范围进行了研究,并进一步采用正交试验法确定了最佳工艺参数。