Phase transitions and diffusion kinetics during Mg- and Li-ion insertions into the Mo6S8 chevrel phase compound studied by PITT

Careful potentiostatic intermittent titrations (PITT) were performed in order to study Li⁺- and Mg²⁺-ion insertions into the Mo₆S₈ chevrel phase compound. Potential dependences of equilibrium and dynamic characteristics of the insertion processes, such as the differential intercalation capacitance, C_dif, the chemical diffusion coefficient, D, and the specific ionic conductivity, κ, were measured and interpreted in terms of lattice-gas models with highly attractive interactions between the inserted ions. Li-ion conductivity of the slightly intercalated chevrel phase is much higher than that of Mg-ions, which can be attributed to a higher charge density of the latter ion and to its higher polarization effect on the S₈ anions’ lattice of the host material. Some crystallographic arguments related to the low mobility of the Mg-ion on the one hand, and the extremely high mobility of most of the divalent d-metal cations in the Mo₆S₈ chevrel phase on the other hand, are discussed.     

3,6-二肼基-1,2,4,5-四嗪及其盐的合成与表征

以三氨基胍盐酸盐和2,4-戊二酮为原材料,通过成环反应,氧化脱氢,肼基取代,三步合成了3,6-二肼基-1,2,4,5-四嗪,同时,对3,6-二肼基-1,2,4,5-四嗪的含能盐的合成进行了研究。对文献报道的反应路线进行了适当的放大研究。通过红外光谱分析、元素分析、质谱分析和1HNMR等方法对产物的结构特征进行了鉴定。     

3,6-二（3 ′-氨基呋咱-4-基）-1,4-二氧杂-2,5-二氮杂环己-2,5-二烯的晶体结构（英）

制备并表征了化合物3,6-二(3'-氨基呋咱-4-基)-1,4-二氧杂-2,5-二氮杂环己-2,5-二烯(BADDD) .其晶体结构参数为:Mr=252.17,三斜晶系,P-1空间群,a=0.48616 (10) nm,b=0.5237 (2) nm,c=0.97076 (19) nm,α=102.25(3)°,β=93.631(17)°,γ=101.88 (2)°,V=0.23489 (12) nm3,Z=1,Dc=1.783g·cm-3,λ (MoKα)=0.071073 nm,μ(MoKα)=0.153 mm-1,F(000)=128,T=294 (2) k,R1=0.0351 and wR2=0.0875.BADDD分子由两个氨基呋咱环和一个由两个O原子,两个N原子和两个C原子组成的六元杂环构成.分子具有中心对称性.     

碟形飞行器复合控制的非线性分配策略研究

针对碟形飞行器变质量矩／推力矢量复合控制系统，研究了以输出误差为参考量的非线性控制分配策略。仿真表明，这一设计实现了两种控制方式的优势互补．又避免了强制切换控制方式所引起的控制扰动，达到了良好的控制性能。     

Effect of adding Sb on microstructure and adhesive strength of Sn-Ag solder joints

This study investigates the influence of adding Sb on the microstructure and adhesive strength of the Sn3.5Ag solder. Both solidus and liquidus temperatures increase as Sb additions increase. Adding 1.5wt.%Sb leads to the narrowest range (6.6°C) between the solidus and liquidus temperature of the solder. Adding Sb decomposes the as-soldered ringlike microstructure of Sn3.5Ag and causes solid-solution hardening. The as-soldered hardness increases with increasing Sb addition. For long-term storage, adding Sb reduces the size of the rodlike Ag₃Sn compounds. The hardness also increases with increasing Sb addition. Adding Sb depresses the growth rate of interfacial intermetallic compounds (IMCs) layers, but the difference between 1% and 2% Sb is not distinct. For mechanical concern, adding Sb improves both adhesive strength and thermal resistance of Sn3.5Ag, where 1.5% Sb has the best result. However, adding Sb causes a variation in adhesive strength during thermal storage. The more Sb is added, the higher the variation reveals, and the shorter the storage time requires. This strength variation helps the solder joints to resist thermal storage.     

大扭矩液压马达的发展现状与展望

综述了大扭矩浪压马达的基本概念、性能指标、分类以及国内外发展状况，提出了一种新型大扭矩液压马达-复合齿轮马达，该种大扭矩液压马达有着重要的应用前景和实用价值。     

高活性生物复合酶废纸脱墨的研究

以纤维素酶、木聚糖酶和蛋白酶等组成的复合酶对旧报纸进行脱墨，研究了脱墨中各种因素对脱墨效果的影响，得到脱墨的较佳工艺条件为：酶用量0．201U／g，碎浆浓度15％，脱墨时间35min，脱墨温度50℃，pH值5．0；并对漂白前后脱．圣浆的性能指标进行了比较。用此复合酶脱墨工艺，脱墨达到了较好的效果，有可工业化生产应用的良好前景。     

氮化物对柴油深度和超深度加氢脱硫的影响 Ⅱ 工艺条件和催化剂的影响

 采用硅胶脱除原料中氮化物，得到硫含量相同而氮含量不同的4种柴油原料。为了考察不同的催化剂、反应温度和氢分压条件下，氮化物对加氢脱硫(HDS)反应的影响，在330~370℃、2.0~6.4MPa、液时空速2.0h-1、氢/油体积比300的条件下，分别采用NiW/Al2O3和CoMo/Al2O3催化剂在小型固定床实验装置上，对4种柴油原料进行HDS反应。结果表明，氮化物对HDS反应有明显的抑制作用，但在两种催化剂上氮化物对HDS反应的抑制作用大小在不同的反应条件下的变化是不同的。当反应温度高于340℃或氢分压高于4.8MPa时，氮化物对CoMo/Al2O3 HDS活性的抑制作用大于对NiW/Al2O3上HDS活性的抑制作用；当氢分压低于3.2MPa时，氮化物对NiW/Al2O3 HDS活性的抑制作用较大。     

剥离型聚丙烯-蒙脱土纳米复合材料Ⅰ.Ziegler-Natta/有机改性蒙脱土复合催化剂催化丙烯聚合

采用化学反应法制备了Z ieg ler-Natta/有机咪唑盐改性蒙脱土复合催化剂(简称复合催化剂),并通过丙烯单体原位插层聚合制备了聚丙烯-蒙脱土纳米复合材料。考察了n(A l)∶n(T i)、聚合温度、聚合时间及溶剂种类对复合催化剂的活性及定向催化能力的影响。研究结果表明,与商品化CS-2型Zieg ler-Natta催化剂相比,复合催化剂的活性明显降低,在n(A l)∶n(T i)=100、聚合温度60℃、聚合时间1h、正庚烷为溶剂时,复合催化剂的活性较高,可达78.4kg/(m ol.h)。合成聚丙烯的等规度在85%~97%之间,熔融温度在160℃左右,重均相对分子质量达到(3.6~4.6)×105,相对分子质量分布在6.1~6.6之间。溶剂种类对合成聚丙烯的等规度影响较大。     

小角散射（SAS）技术在含能材料结构表征中的应用

较详细分析了小角散射(SAS)技术测试含能材料结构的原理，对国内外SAS技术在含能材料结构表征方面的应用进行了综述。国内外的研究表明：SAS技术不仅可表征单质炸药粉体的特定微观结构，还可对炸药药柱及PBX的特定微观结构进行定量测量，对超细及纳米含能材料的团聚状态表征也具有良好应用前景。