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排序方式: 共有108条查询结果,搜索用时 250 毫秒
1.
1,2-二乙炔基四苯基乙硅烷与1,2-二乙炔基四甲基乙硅烷在催化剂铑(Ⅰ)络合物[氯化三-(三苯基膦)铑]的作用下得到一种新的含硅共聚物。实验证明此共聚物的主链是有规交替结构。研究了固体薄膜及其溶液的光解作用,并测定了SbF_5蒸气处理后的共聚物薄膜的导电性。 相似文献
2.
M. L. Balinski 《Mathematical Programming》1986,34(2):125-141
Where there is abundance of mystery and confusion in every direction, the truth seldom remains hidden for long. It's a matter of having plenty of angles to go at it from. Only the utterly simple crimes - the simplex crimes, you may say - have the trick of remaining baffling. - Sir John (from Michael Innes,The Open House (A Sir John Appleby Mystery), Penguin Books, 1974).A dual simplex method for the assignment problem leaves open to choice the activity (i,j) of rowi and columnj that is to be dropped in pivoting so long asx
ij
< 0. A choice (i,j) over columnsj having at least 3 basic activities that minimizesx
ij
is shown to converge in at most (
2
n-1
) pivots, and at most O(n
3) time, and it is argued that on average the number of pivots is at mostn logn.
Dedicated with affection to George B. Dantzig on the occasion of his seventieth birthday. 相似文献
3.
利用Rhcovibron DDV-II-EA型动态粘弹谱仪测试了PET平纹布在不同温度热定型后的布样及其经、纬纱的动态力学性质。发现布及其纱的动态力学-温度谱与原纤维的截然不同。在[Ε]-T 曲线上出现[Ε]峰,[Ε]_max值随织物热定型温度的增高呈指数下降,峰位向高温移动。同时在Ε’’-T曲线上出现双损耗模量峰,相应的松弛转变活化能相差半个数量级。初步分析认为,与织布过程及随后的织物热定型有关。 相似文献
4.
《Electrophoresis》2017,38(3-4):417-428
The mechanisms underlying the aberrant growth and interactions between cells are not understood very well. The pre‐B acute lymphoblastic leukemia cells directly obtained from an adult patient grow very poorly or do not grow at all at low density (LD), but grow better at high starting cell density (HD). We found that the LD ALL3 cells can be stimulated to grow in the presence of diffusible, soluble factors secreted by ALL3 cells themselves growing at high starting cell density. We then developed a biochemical purification procedure that allowed us to purify the factor(s) with stimulatory activity and analyzed them by nanoliquid chromatography‐tandem mass spectrometry (nanoLC‐MS/MS). Using nanoLC‐MS/MS we have identified several proteins which were further processed using various bioinformatics tools. This resulted in eight protein candidates which might be responsible for the growth activity on non‐growing LD ALL3 cells and their involvement in the stimulatory activity are discussed. 相似文献
5.
Tianqing Liu Yinyin Gan Lilia Song Jing Qiu Liuhua Chen 《Journal of Dispersion Science and Technology》2013,34(10):1370-1375
Vesicles have been prepared at a constant molar ratio of L-glutamic acid/1-aminodecane/ibuprofen/H2O. The fusion dynamics of the vesicles have been directly observed and followed by using optical microscopy and freeze fracture replication-electron microscopy technologies. With time increasing up to 25 minutes, the vesicles slowly fuse to form large stable vesicles. A membrane phase transition temperature is detected at 97°C. 相似文献
6.
《复变函数与椭圆型方程》2012,57(2):109-121
We study the asymptotic behavior of semigroups generated by holomorphic mappings by using an infinitesimal version of the boundary Schwarz-Wolff Lemma. In particular, the best rate of exponential convergence is obtained. In addition, we establish a geometrical version of the implicit function theorem. 相似文献
7.
Yan Ziqian 《东北数学》1995,(3)
ThreeClassesofReaction-DiffusionSystemswithNeumannBoundaryCondition¥(严子谦)YanZiqian(DepartmentofMathematics,JilinUniversity,Ch... 相似文献
8.
G. B. Parravicini A. Stella M. C. Ungureanu P. G. Merli A. Migliori P. Cheyssac R. Kofman 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,24(1-3):219-222
Both theoretical and experimental works give evidence that
gallium exhibits solid phases labelled , , , besides the
stable phase strongly dependent both on the size and the
confinement conditions. An experimental technique was used based
on capacitance and conductance measurements
vs. temperature in the
audiofrequency range. This technique is particularly sensitive
to the conditions of the investigated particle surface that
plays a fundamental role in the melting and more generally in
the phase transition processes. In particular the strict
relation between the derivative of the capacitance with respect
to the temperature, dC/dT, and the entropy of the system is
considered. In gallium nanoparticles 20 nm in radius, only the
phase is shown to occur. Further the transition to liquid phase
was detected. The melting process was found to start about 65 K
below the full melting temperature value. In the case of
particles 10 nm in radius, where different metastable phases may
occur, the capacitance vs.
temperature curve was found to display abrupt changes of the
slope. The singularities are associated to a well defined
transition temperature. 相似文献
9.
CI战略成功导入的关键,是对企业内部CI作业群体的行为进行系统、科学的管理。本文在首先提出企业内部群体行为管理假说的基础上,借鉴系统科学的相关思想,就CI作业过程中群体行为管理的基本方法,作了较为深入,全面的探讨。 相似文献
10.
刘德辅 《数学物理学报(B辑英文版)》1995,(1)
(刘德辅)BEHAVIORASt→∞OFTHESOLUTIONSOFTHELINEARSYSTEMOFELASTICTHEORYONNON-STAR-SHAPEDEXTERIORDOMAINS¥LiuDefu(Dept.ofApplMath.,Bei... 相似文献