纺缍形α-Fe2O3/聚苯乙烯复合高分子微球的制备、表征及等电性研究

以纺缍形α-Fe2O3超微粉为内核，过硫酸钾为引发剂，聚乙二醇为分散剂和稳定剂，乙醇／水为分散介质，苯乙烯为单体，用改进的分散聚合法合成了核／壳型纺锤形的高分子微球，并用XRD、TEM和IR进行了表征。粒子的分散性较好，粒径分布窄。由于亲水性的α-Fe2O3与亲油性的苯乙烯亲合性较差，在实验中采用了超声分散、预先溶胀和预先吸附引发剂、分散剂的方法，增强了粉末表面的亲油性，合成的高分子微球，其长轴平均为0．26μm，短轴平均为0．09μm，轴比为2．9，同时测定了不同pH值时粒子包膜前后的Zeta电位值，并根据粒子等电点的变化计算出包膜厚度，与电镜照片的结果比较吻合。     

关于亚纯函数族的几个正规定则

本文主要讨论了亚纯函数的分担值与亚纯函数的正规族之间的关系，得到了关于亚纯函数的一些正规定则。     

我国区域经济与区域市场的发展

随着经济的发展,我国区域经济差距进一步拉大,既有体制和政策原因,又有各个地区自身因素.要解决这一问题,需要大力发展区域市场.首先要扫除体制障碍;其次要明确中央和地方的权利和义务,要真正做到政企分开,消除地方保护主义,实现区域开放;最后,要充分发挥企业的主动性,提高企业核心竞争力.     

40Ar-39Ar ages of the Louzidian-Dachengzi ductile shear zone near Chifeng,Inner Mongolia and their tectonic significance

The Louzidian normal fault occurs as the eastern detachment fault of the Kalaqin metamorphic core complex. Field observations and microstructural analyses reveal that the Louzidian-Dachengzi ductile shear zone developed in its lower-plate was genetically related to sinistral strike-slips and extensional faulting. Two samples from this ductile shear zone yield 40Ar-39Ar plateau ages of 133 Ma (Bi) and 126 Ma (Kp), which are concordant with their isochron ages. The plateau age of 133 Ma (Bi) records the formation age of the ductile shear zone. The inconsistent relationship between the earlier strike-slip ductile shear zone and the later normal fault makes the Kalaqin Quasi-metamorphic core complex distinctive from Cordilleran metamorphic core complex. These ages provide important geochronological data for putting constraints on the formation age and genesis of such ductile shear zones.     

Evidence for cold events in the early Holocene from the Guliya ice core, Tibetan Plateau, China

Evidence for the “8.2 ka cold event” has been provided mostly from the circum-North Atlantic area. However, whether this cold event occurred in other places is a key to understanding its cause. Here, we provide the evidence for the “8.2 ka cold event” from the Guliya ice core in the northwest Tibetan Plateau, and it was found that the peak cooling (~8.3—8.2 ka) in this ice core was about 7.8—10℃, which was larger than the cooling in the North Atlantic region. The primary causes for this episode were diminished solar activity and weakened thermohaline circulation. Moreover, another weak cold event, centered about 9.4 ka, was also recorded in the Guliya ice core record. These two cold events were concurrent with the ice-rafting episodes in the North Atlantic during the early Holocene, which implies that the millennial-scale climatic cyclicity might exist in the Tibetan Plateau as well as in the North Atlantic.     

分担值和正规族

设∮是单位圆盘⊿上的一族亚纯函数族,a和b是两个不同的有限复数,如果对于∮中的每一个函数f, f和f^(k)在⊿上分担a和b,而且f(z)-a的零点重级≧k,其中k≧3是一个正整数,则∮在⊿上正规.     

关于亚纯函数族的正规定则

在亚纯函数及整函数上讨论了{f(z)}和{f(f(z))}的正规族之间的关系,讨论函数及其k阶导数与其正规族之间的联系,得到关于亚纯函数族的一系列正规定则,最后给出了其应用     

合作对策方法在确定组合预测权系数中的应用

从对策论的观点出发,将组合预测中各单项预测模型视为合作对策的局中人、组合观测的误差平方和视为合作的结果,再按Shapley值法在各单项预测模型中进行分配,从而获得组合预测权系数确定的一种方法。该方法具有概念清楚、涵义明确的特点,结果令人满意。     

冀东变质核杂岩中银金矿床地质地球化学特征

赋存于中元古宙长城系常州沟组的洞子沟银矿床和尖宝山金矿床是由密云-都山变质核杂岩构造体系所控制的一组矿床.其成因为中元古宙火山岩浆活动形成的沉积矿源,后经中生代的变质核杂岩构造岩浆体系叠加改造而成.洞子沟银矿床具有层控迭加改造的特点;尖宝山金矿床则具有破碎蚀变岩型矿床的特点.两矿床的围岩蚀变类型以及微量、稀土元素特征也表现一定的相似性.它们是中元古宙大红峪期和中生代印支、燕山等多期次的伸展构造环境下岩浆活动的产物.矿床在变质核杂岩中所处的构造部位及其矿体赋矿围岩性质的不同决定了它们不同的矿化特点.对该类矿床的成矿机制也做了初步探讨.     

长期高温高压氢暴露对CrMo钢断裂韧性和裂纹行为的影响

选用CrMo钢经400℃, 20 MPa, 10 h氢暴露后进行拉伸、断裂韧性和疲劳试验.结果表明:CrMo钢已经发生了氢腐蚀,氢蚀使CrMo钢强度、塑性和断裂韧性均有所降低,也使断裂机制由韧窝型转变为解理脆性.氢蚀使疲劳裂纹扩展行为也发生了变化,疲劳裂纹扩展速率增加,降低.CrMo钢氢蚀后,随应力比增加,疲劳裂纹扩展门槛值大幅度降低.