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Let Nn(R)be the algebra consisting of all strictly upper triangular n × n matrices over a commutative ring R with the identity.An R-bilinear map φ :Nn(R)×Nn(R)→ Nn(R)is called a biderivation if it is a derivation with respect to both arguments.In this paper,we define the notions of central biderivation and extremal biderivation of Nn(R),and prove that any biderivation of Nn(R)can be decomposed as a sum of an inner biderivation,central biderivation and extremal biderivation for n ≥ 5. 相似文献
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本文考察了包括平面上的各种广义 Cantor集 ,Sierpinski集和包括某些连续不可微曲线在内的广义 Sierpinski集 .由相似变换 ,导出了它们的级数表达式 ,并利用它和字符串空间的对应关系 ,计算出它们的Hausdorff维数 相似文献
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Bush连续不可微函数的分形性质 总被引:1,自引:0,他引:1
本文对用递推关系确定的Bush连续不可微函数,找出了迭代函数系(IFS),从而得到它的级数表达式和所具有的自仿射分形的有关性质.最后还计算出函数图象的Hausdorff 维数的准确值. 相似文献
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Koch曲线的级数展开式 总被引:1,自引:0,他引:1
本文给出Koch曲线的级数展开式,利用这一展开式证明了Koch曲线满足指数为α=log3/log4的Hoelder条件和处处不可微。 相似文献
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从层层组装的核壳粒子到医学/生物化学诊断和药物输送 总被引:2,自引:0,他引:2
Layer-by-layer (LbL) assembled core-shell particles are currently studied immensely due to their advantages of tailored dimensions and compositions. They have potential technological applications in areas such as medical/biochemical diagnostics and drug delivery. In this paper, the fabrication of magnetic composite core-shell particles and hollow spheres based on LbL self-assembly and colloidal templating by direct removal of core materials using a variety of chemical and physical methods are mainly reviewed. Some specific examples on the exploitation of core-shell particles in drug delivery, bioassay and biolabeling applications are given. 相似文献
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单分散多孔St/DVB共聚微球的制备 总被引:5,自引:0,他引:5
用分散聚合法制出了粒径约为2μm的单分散聚苯乙烯(PSt)种子,再通过改进的活性二步种子溶胀法制得了粒径约为4.5μm的单分散多孔St/DVB共聚微球。在溶胀阶段,用XSP-8CA生物显微镜观察活化、溶胀温度,1~氯代十二烷(CD,mL)/PSt(g)的比例及单体混合物总体积对溶胀种子粒径及单分散的影响,确定了合适的制备工艺条件。用SEM观察多孔聚合物微球的粒径和形貌,并用BET法考察了不同比例的及甲苯浓度变化对多孔聚合物微球孔结构的影响,实验表明,随着VDVB/Vst的比例的增大和甲苯浓度的提高,多孔微球的比表面积增大,孔分布向小孔区域移动。 相似文献
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王守宇 段波涛 朱欣欣 任修磊 杨晓玲 郗娟 吕丰正 孙大鹏 吕英波 刘希举 华辉 李忠宇 张双全 亓斌 尧江明 竺礼华 吴晓光 李广生 刘颖 李雪琴 郑云 王烈林 汪雷 《中国物理 C》2009,33(10):838-841
Excited states of the positive-parity intruder band in 118Sn have been studied via the 116Cd(7Li, 1p4n) reaction at 7Li energy of 48 MeV using techniques of in-beam γ-ray spectroscopy. This intruder band has been observed up to 7187 keV with spin (16+). The structural evolution of this intruder band with increasing angular momentum has been discussed in terms of the aligned angular momentum and the ratio of the E-Gamma Over Spin (E-GOS) curve. 相似文献