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101.
载体SiO2表面修饰对钒基催化剂丙烷氧化脱氢催化性能的影响 总被引:2,自引:0,他引:2
用XRD,Raman,FT-IR,^51V-NMR,Py-IR和TPR-TPO表征SiO2或SiO2上预负载MgO后负载的钒氧化物催化剂体系。SiO2上直接负载钒氧化物,在钒负载量约为5wt%V2O5时出现V2O5晶相,而预负载MgO在相同钒含量时则没有出现V2O5晶相,表面预负载MgO促进了钒氧化物在载体表面的分散。 相似文献
102.
翁妙凤 《江苏大学学报(自然科学版)》1999,(2)
以面向对象的程度设计方法,实现了用遗传算法求解FlowShop调度问题(FSSP)文中讨论了FSSP的不同存贮方式(UIS、FIS和NIS),时限问题以及不同的交叉算子对算法的作用 相似文献
103.
104.
物理化学实验是一门集数学、物理、化学于一体的必修综合性技能课程,起着连接基础学科、应用学科及科学研究的作用。该文结合地方院校的物理化学实验过程教学内容、实验数据处理、学生对仪器设备的使用等教学环节及考核方式,同时对学生心理情况进行了分析,再对教学中出现的问题进行了阐述,并提出通过循环式教学、加强实验技能及设置开放式实验等方法提高教学质量,在教学过程中注重培养学生的动手操作能力,适应了目前应用型人才培养模式。 相似文献
105.
Strontium was introduced into CeO2–ZrO2 mixed oxides (CZ) by doping and impreg-nation metho ds, and then Pt was impregnated on the Sr-modifie d CZ to obtain the catalysts. X-ray diffraction (XRD), X-photon spectra (XPS), high-resolution transmission electronic microscopy (HRTEM) and H2 temperature programmed reduction (TPR) were carried out to characterize the micro-structure and reducibility of catalysts. The oxygen storage capacity (OSC) was evaluated with CO serving as probe gas. The results showed that the incorporation of Sr2+ in the lattice of CZ could promote the OSC properties by increasing the structure defects and enhancing the diffusion rate of oxygen from bulk to surface. For the Sr-impregnated sample, the strong metal–support interaction (SMSI) between Pt and CZ was interrupted, since Sr covered parti al surface Ce species. Such interruption retarded the back-spillover effect occurring at the Pt/Ce interface at low temperature, resulting in the loss of OSC. Meanwhile, it was found that a part of impregnated Sr2+ could partially diffuse from the surface to the inner atomic layers of CZ and partially incorporated in the lattice during the calcination. The OSC performance of Sr-impregnated sample therefore climbed remarkably with the rise of temperature. 相似文献
106.
107.
The corrosion inhibitor is one of the most important technologies to enhance the durability of steel-reinforced concrete. A kind of time-saving method was developed to assess the inhibitor efficiency by using a 32 V electric field to accelerate chloride ion migration in concrete. Potentiodynamic polarization scanning test was used to evaluate the corrosion states. The comprehensive efficiency of an inhibitor should be assessed in two aspects: resistance to chloride ion permeability and inhibiting efficiency. The specimens with different mixing amount of sodium nitrite and migration corrosion inhibitors were used to verify the accuracy and reliability of this method. The results show the differences in inhibiting efficiency of the inhibitors clearly, indicating the reliability of this time-saving method. 相似文献
108.
The distribution of ghrelin-like immunoreactive cells in amphioxus (Branchiostoma belcheri) was investigated by using immunohistochemical staining with rabbit antiserum against synthetical mammalian ghrelin. The results showed that ghrelin-like immunoreactive cells were distributed widely in the nervous system, Hatschek's pit, wheel organ, digestive tract and gonads (ovary and testis). In nervous system, ghrelin-like immunoreactive neurons and their protrusions were distributed specifically on the dorsal side, ventral side and funnel part of brain vesicle, with a few dispersive immunoreactive nerve cells and their fibers in nerve tube. Ghrelin-like immunoreactivities were also detected in Hatschek's pit epithelial cells and wheel organ cells, with positive substance located along cell membrane. In digestive tract, ghrelin-like immunoreactive cells existed in hepatic diverticulum, anterior and posterior region of midgut, and could be classified into two types, closed- and opened-type endocrine cells. The number of positive cells was most in hepatic diverticulum, secondary in posterior region of midgut and least in anterior region of midgut. In gonads, ghrelin-like immunoreactive substance was detected in oogonia, oocytes and follicle cells in ovary at the small and large growth stages and in early spermatogenic cells and Sertoli cells in testis. The extensive distribution of ghrelin-like cells in amphioxus suggested that these kinds of cells are conservative in evolution and diversified in function. At the same time, we found for the first time that ghrelin-like immunoreactive cells existed in brain vesicle and Hatschek's pit, which provided new morphological evidence for the existence of an activation pathway between brain vesicle and Hatschek's pit for the regulation of growth hormone excretion. 相似文献
109.
The distribution of ghrelin-like immunoreactive cells in amphioxus (Branchiostoma belcheri) was investigated by using immunohistochemical staining with rabbit antiserum against synthetical mammalian ghrelin. The results showed that ghrelin-like immunoreactive cells were distributed widely in the nervous system, Hatschek’s pit, wheel organ, digestive tract and gonads (ovary and testis). In nervous system, ghrelin-like immunoreactive neurons and their protrusions were distributed speci?cally on the dorsal side, ventral side and funnel part of brain vesicle, with a few dispersive immunoreactive nerve cells and their ?bers in nerve tube. Ghrelin-like immunoreactivities were
also detected in Hatschek’s pit epithelial cells and wheel organ cells, with positive substance located along cell membrane. In digestive tract, ghrelin-like immunoreactive cells existed in hepatic diverticulum, anterior and posterior region of midgut, and could be classified into two types, closed- and opened-type endocrine cells. The number of positive cells was most in hepatic diverticulum, secondary in posterior region of midgut and least in anterior region of midgut. In gonads, ghrelin-like immunoreactive substance was detected in oogonia, oocytes and follicle cells in ovary at the small and large growth stages and in early spermatogenic cells and Sertoli cells in testis. The extensive distribution of ghrelin-like cells in amphioxus suggested that these kinds of cells are conservative in evolution and diversified in function. At the same time, we found for the ?rst time that ghrelin-like immunoreactive cells existed in brain vesicle and Hatschek’s
pit, which provided new morphological evidence for the existence of an activation pathway between brain vesicle and Hatschek’s pit for the regulation of growth hormone excretion. 相似文献
110.
本文采用溶胶-凝胶法制备聚酰亚胺/二氧化硅-氧化铝(PI/SiO2-Al2O3)杂化薄膜。运用红外光谱仪、示差扫描量热仪和紫外-可见分光光度计分别测试了亚胺化过程中各阶段杂化膜的特征基团吸收峰的变化,反应热以及紫外-可见光透过率。使用原子力显微镜分析了无机相在亚胺化各阶段的形貌变化。通过这些分析推测了杂化薄膜的分子结构。 相似文献