排序方式: 共有77条查询结果,搜索用时 31 毫秒
31.
应用凸锥上的一个不动点定理,讨论了一类一维p-拉普拉斯四点边值问题在非线性项f依赖于未知函数的一阶导数的情况下拟对称正解的多重性,得到了这类边值问题存在多个拟对称正解的充分条件. 相似文献
32.
The Maslov P-index theory for a symplectic path is defined. Various properties of this index theory such as homotopy invariant, symplectic additivity and the relations with other Morse indices are studied. As an application, the non-periodic problem for some asymptotically linear Hamiltonian systems is considered. 相似文献
33.
本文给出新的NCP函数,这些函数是分段线性有理正则伪光滑的,且具有良好的性质.把这些NCP函数应用到解非线性优化问题的方法中.例如,把求解非线性约束优化问题的KKT点问题分别用QP-free方法,乘子法转化为解半光滑方程组或无约束优化问题.然后再考虑用非精确牛顿法或者拟牛顿法来解决该半光滑方程组或无约束优化问题.这个方法是可实现的,且具有全局收敛性.可以证明在一定假设条件下,该算法具有局部超线性收敛性. 相似文献
34.
本文应用凸锥上的一个不动点定理,讨论了一类含p-Laplacian算子的三阶非齐次边值问题多重正解的存在性,得到了这类边值问题至少存在三个正解的充分条件,并给出了一个实例. 相似文献
35.
为建立一种可靠、安全、方便的清洁级雄性SD大鼠亚慢性镉中毒模型,选取32只SD雄性大鼠随机分组,每天分别用含0,0.3,0.6和1.2mg·kg-1剂量的CdCl2溶液腹腔注射大鼠,研究镉离子在对清洁级雄性SD大鼠肝脏组织和性腺组织的损伤情况。结果显示,试验组大鼠的体重增长速度慢于对照组,两者之间具有显著性差异(P<0.05)。大鼠性腺组织和肝脏组织中的镉含量与镉离子呈剂量效应关系。氯化镉溶液处理大鼠28d后,试验组性腺组织中富积镉含量分别为0.022,0.84,1.17和1.94mg·kg-1,肝脏组织富积镉含量分别为0.012,14.35,26.28和59.9mg·kg-1。试验组性腺和肝脏组织富积镉的量均显著高于对照组。病理组织切片结果显示,试验组大鼠肝脏和性腺组织均出现不同程度的损伤。大鼠经过7d适应性饲养之后,每天腹腔注射浓度为0.31.2mg·kg-1镉溶液,且连续处理28d,可以建立大鼠亚慢性镉中毒模型。 更多还原 相似文献
36.
构建褶纹冠蚌热休克蛋白70基因的原核表达质粒pET30a-cpHSP70,并经酶切和DAN测序鉴定。将其转入到表达宿主BL21(DE3)菌中,用IPTG诱导表达,最后用SDS-PAGE和Western-blot检测。结果显示:新表达的重组蛋白分子量约为74kD。在IPTG的诱导下,其表达量随时间的增加而增加,最适表达条件是37℃诱导8h。表达蛋白可溶性分析发现,一部分蛋白以不溶性的包涵体形式存在,一部分蛋白以可溶性蛋白形式存在。Westernblot检测显示蚌在35℃热激诱导1h后,其血、鳃、肌肉、肝胰腺和外套膜组织cpHSP70蛋白表达水平相对于蚌在20℃暂养3h后的表达量明显升高。 相似文献
37.
Danyang Ma Chungen Li Lei Wang Hao Liu Shengliang Zhong Yuan Li 《Journal of nanoparticle research》2017,19(10):341
Rare-earth-based infinite coordination polymer (RE-ICP) spheres with diameters ranging from 50 nm to 2 μm have been prepared using meso-2,3-dimercaptosuccinic acid (DMSA) as ligand under hydrothermal conditions. RE2O2SO4 microspheres with similar morphology were obtained by calcining the corresponding RE-ICP spheres. However, as for Ce-ICP and Sc-ICP, CeO2 and Sc2O3 were obtained. The products were characterized using X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, infrared spectroscopy, laser Raman spectrometry, and energy-dispersive X-ray spectrum. Elemental analysis and inductive coupled plasma atomic emission spectrometer were adopted to study the composition of the Eu-ICP. To explore their potential applications, several samples of the products were selected and their properties were investigated. The Eu-ICP and Eu2O2SO4 microspheres give strong red emissions when excited with a 394-nm ultraviolet light. Furthermore, the Eu-ICP displays a high selectivity for Fe(III). The obtained CeO2 has a strong absorption in the UV region and the Gd2O2SO4 microspheres show paramagnetic behavior. 相似文献
38.
In this paper, we propose a new nonmonotone algorithm using the sequential systems of linear equations, which is an infeasible
QP-free method. We use neither a penalty function nor a filter. Therefore, it is unnecessary to choose a problematic penalty
parameter. The new algorithm only needs to solve three systems of linear equations with the same nonsingular coefficient matrix.
Under some suitable conditions, the global convergence is established. Some numerical results are also presented. 相似文献
39.
LIU Chungen 《数学年刊B辑(英文版)》2000,21(2):225-232
51.IntroductionandMainResultsInthispaper,weconsiderthestabilityoftheperiodicsolutionsofthefollowingsecondorderHamiltoniansystemswherenisapositiveillteger.V:Rxac-RisafUnctionandforT>0itisT-periodicforthevariablet.VJdenotesitsgradientwithrespecttox.Wenowstatethemainresultsofthispaper.Forthesuperquadraticcase)wehavethefollowingtwotheoremsTheorem1.1.SmposeVsatiSfiesthefollowingconditions:(VI)VEC'(RxR",R)andV(t T,x)=V(t,x),V(t,x)ERxR".(V2)ThereexistconstantSp>2andco>0suchthat0相似文献
40.
钇离子在铜电极上的电极过程及表面合金化 总被引:1,自引:0,他引:1
钇离子在铜电极上的电极过程及表面合金化周春根,段淑贞(北京科技大学理化系,北京100083)通过熔盐电化学表面合金化方法获得的镀层非常均匀、无裂纹,具有很强的抗腐蚀性能,其原因是获得的合金镀层系由一种金属原子向另一种基体金属表面扩散的结果 ̄[1,2]... 相似文献