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21.
在分段区域上的两参数奇摄动非线性方程的ROBIN问题 总被引:2,自引:1,他引:1
吴钦宽 《应用泛函分析学报》2002,4(1):81-85
讨论一类在分段区域上的两参数奇异摄动非线性Robin边值问题。利用算子理论和不动点原理,得到了相应问题解的存在性和唯一性。 相似文献
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Electrolytic fixation of CO2 was investigated by electrocarboxylation of organic halides (RX), and four esters Ⅰ,Ⅱ Ⅲ, Ⅳ) were obtained in moderate yields. Electrochemical reduction esterifications of RX in the presence of CO2 were carried out on nanocry‘stalline TiO2-Pt electrode. The electrochemical behavior of RX in the presence of CO2 was investigated by the technique of cyclic voltammetry, and the probable reaction mechanism w,as proposed. 相似文献
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本文报道了一种用水溶性CdTe量子点传感磷酸根离子的发光方法. 该法是基于在具有自然尺寸分布的单一量子点样品中三价铕所诱导的能量转移. 实验表明, 三价铕离子能诱导表面带有负电荷的量子点发生簇集, 引发量子点间的能量转移, 导致显著的发光猝灭和发射位移. 当在上述体系中加入磷酸根离子时, 由于它与三价铕离子强烈的配位竞争瓦解了所形成的量子点簇集, 因此引起量子点起始发光的逐渐恢复. 该法具有高的灵敏度、大的发射位移和可测颜色变化等量子点发光优势, 用于环境水样中磷酸根离子的测定, 结果令人满意. 相似文献
24.
桩端盖机设计和生产必须解决塑性极限弯矩、配套电动机功率、工件下料尺寸等计算问题.把桩端盖机的工件加工过程视为一个塑性折弯过程,根据问题的特点,提出基于Tresca屈服准则的一种简化计算方法,解决了工件在塑性折弯过程中的受力分析、应力和变形分析等问题,得到相应的数学表达式.最后结合某厂生产实际给出了一个计算实例,为桩端盖机设计提供了理论依据. 相似文献
25.
A powerful approach to the synthesis of an unprecedented polynorbornene with pendant moiety bearing azide and terminal alkyne groups is developed.Two key intermediates,namely,3-azido-5-(2-(trimethylsilyl)ethynyl) benzyl alcohol and 4-(4-azatricyclo [5.2.1.0~(2.6)]dec-8-en-4-yl) benzoic acid,were optimally synthesized for convergent synthesis of the corresponding monomer. 相似文献
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The microwave-assisted hydrothermal synthesis of Bi2S3 nanorods was reported.The result showed that microwave irradiation can help to produce Bi2S3 nanorods in very short time.There is a negative feedback effcet which increases the degree of crystallinity in the reaction. 相似文献
28.
Surface Modification of Nano-SiO_2 by Grafting PMMA/PBA 总被引:2,自引:0,他引:2
IntroductionThankstotheirsizesatnano level ,thenano particleshavesomenewandpreternaturalpropertiesdifferentfromnormalmaterials ,andtheycanbeappliedinmanyfieldssuchascatalysts,lightfiltration ,lightabsorbing ,medicine ,magneticmediumandnewmaterialsaswell.1,2Itisalsorecognizedasoneofthemostprosperousmateri alsinthe 2 1century .Nowadays ,scientistsandre searcherspaymoreattentiontopolymer nano inorganiccompounds,becausepolymeriseasytoprocess ,anditcanavoidtheoxidationandcoagulationofthenano parti … 相似文献
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Chemically induced dynamic electron polarization investigation of the triplet-radical system in the solution of the triplet quencher 总被引:1,自引:0,他引:1
The chemically induced dynamic electron polarization (CIDEP) of the triplet molecule/triplet quencher/2,2,6,6-te-tramethyl-1-piperidinyloxyl (TEMPO) systems were measured using the high time-resolved ESR spectrometer.The competition between the radical-triplet pair mechanism (RTPM) and triplet mechanism (TM) or radical pair mechanism (RPM) polarization in the solution of the triplet quencher was investigated,and the relationship between reaction rate of the radical-triplet pair and quenching rate of triplet was deduced. 相似文献