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1.
Liu Kun-Hong Zhan Wang-Ping Liang Yi-Fan Zhang Ya-Nan Guo Hong-Zhou Yao Jun-Feng Wu Qing-Qiang Hong Qing-Qi 《Applied Intelligence》2022,52(7):7843-7869
Applied Intelligence - The Open-Set recognition is an important topic in the pattern recognition research field. Different from the close-set recognition task, in the open-set recognition problem,... 相似文献
2.
Hemoglobin (Hb) was used as a catalyst for the growth of single-walled carbon nanotubes (SWCNTs). Hb was deposited onto a hydrophilic treated substrate by spin coating method. After oxidation at 800 °C, protein chains were decomposed and iron oxide nanoparticles remained with an average diameter of 2.29 nm. High quality SWCNTs were synthesized with an average diameter of 1.22 nm. The protein chains prevent iron atoms aggregation and so the size of the nanoparticles is smaller than that from ferritin-like proteins. 相似文献
3.
Dong Sung Kim Hyun Sup Lee Junghyun Lee Sungjoo Kim Kun-Hong Lee Wonkyu Moon Tai Hun Kwon 《Microsystem Technologies》2007,13(5-6):601-606
In this paper, we present a simple and cost-effective replication method of high-aspect-ratio polymer nanopillar array as
a biomimetic gecko’s foot hair prototype. A UV nano embossing process was applied for the replication of polymer nanopillar
arrays. Highly ordered straight nanoporous AAO (anodic aluminum oxide) templates were utilized as reusable master molds. Densely
arranged high-aspect-ratio nanopillar arrays have been successfully fabricated by means of the UV nano embossing process with
the AAO mold. Pull-off force measurements were carried out to characterize the adhesive force of the replicated nanopillar
arrays on the polymer substrates based on the force–distance curves obtained from the atomic force microscope (AFM) with a
modified AFM cantilever. The force measurement results showed that the larger diameter and the taller height of the nanopillars
result in the larger adhesive force. 相似文献
4.
A commercial activated carbon fiber with micropores, CH700-20 (Kuraray), was reformed to a mesoporous one by catalytic gasification.
The catalytic gasification was composed of two steps: CO2 pretreatment and air oxidation. Cobalt was used as the catalyst and gasification was performed in the temperature range of
500–700 °C. BET surface area and pore volume of catalytically modified carbon fiber were analyzed by N2 adsorption. BET surface area of the original CH700-20 was 1,711 m2/g, and the mesopore volume percentage was 11.9%. After catalytic gasification, BET surface area was similar to the original
CH700-20, while mesopore volume percentage increased up to 56%. The average pore size of mesopores was 3–4 nm in diameter.
The average size of mesopores could be controlled with nanometer resolution by varying the temperature and time of activation. 相似文献
5.
The effect of reaction gas and catalyst on the growth of carbon nanotubes (CNTs) in the anodic aluminum oxide (AAO) nano-template was investigated. A mechanism of CNT growth was proposed, which involves the competitive catalytic carbon deposition between on the Co catalyst particles electrodeposited at the bottom of the pores and on the AAO template itself. Presence of H2 in the reacting gas mixture significantly affected the morphology and the wall structure of synthesized CNTs: CNTs of high crystallinity grew out of pores with H2 while no CNTs overgrew in the absence of H2. CNT synthesis by CO disproportionation showed a lower growth rate and a higher degree of ordering than those grown by C2H2 pyrolysis. The unified mechanism of CNT growth on AAO template is also proposed. 相似文献
6.
Bioconjugated gold nanodots and nanoparticles for protein assays based on photoluminescence quenching 总被引:2,自引:0,他引:2
This study describes the first instance of the use of two differently sized Au nanoparticles (Au NPs), acting separately as donor and acceptor, in homogeneous photoluminescence quenching assays developed for the analysis of proteins. Introduction of a breast cancer marker protein, platelet-derived growth factor AA (PDGF AA), to a solution of 11-mercaptoundecanoic acid-protected, 2.0-nm photoluminescent Au nanodots (L(AuND)) led to the preparation of PDGF AA-L(AuND) as the donor. Thiol-derivative PDGF binding aptamers (Apt) and 13-nm spherical Au NPs were used to synthesize the Apt-Q(AuNP) acceptor. The photoluminescence of PDGF AA-L(AuND) at 520 nm decreased when photoluminescence quenching occurred between Apt-Q(AuNP) and PDGF AA-L(AuND). We used the PDGF AA-L(AuND)/Apt-Q(AuNP)-based molecular light switching system to analyze PDGFs and PDGF alpha-receptor in separate homogeneous solutions. In the presence of PDGFs, the interaction between Apt-Q(AuNP) and PDGF AA-L(AuND) decreased as a result of competitive reactions between the PDGFs and Apt-Q(AuNP). Similarly, the interaction between Apt-Q(AuNP) and PDGF AA-L(AuND) reduced as a result of competitive reactions between PDGF alpha-receptor and PDGF AA-L(AuND). The limits of detection (LODs) for PDGF AA and PDGF alpha-receptor were 80 pM and 0.25 nM, respectively, resulting from a low background photoluminescence signal. When using the Apt-Q(AuNP) as selectors for (a) the enrichment of PDGF AA and (b) the removal of matrixes possessing intense background fluorescence from cell media and urine samples, the LOD for PDGF AA decreased to 10 pM. Unlike quantum dots, the L(AuND) provide the advantages of biocompatibility, ease of bioconjugation, and minimal toxicity. 相似文献
7.
We report the synthesis of porous ZnO-ZnSe nanocomposites for use in visible light photocatalysis. Porous ZnO nanostructures were synthesized by a microwave-assisted hydrothermal reaction then converted into porous ZnO-ZnSe nanocomposites by a microwave-assisted dissolution-recrystallization process using an aqueous solution containing selenium ions. ZnO and ZnSe nanocrystallites of the nanocomposites were well-mixed (rather than forming simple core-shell (ZnO-ZnSe) structures), particularly, in the outer regions. Both ZnO and ZnSe were present at the surface and exposed to the environment. The porous ZnO-ZnSe nanocomposites showed absorption bands in the visible region as well as in the UV region. The porous ZnO-ZnSe nanocomposites had much higher activities than the porous ZnO nanostructures. Control experiments using cutoff filters revealed that the main photocatalytic activity of the synthesized nanostructures arose from photo-excitation of the semiconductor (ZnO or ZnSe) via absorption of light of an energy equal to or exceeding the band gap energy. 相似文献
8.
We report a method for synthesizing quasi-single crystalline porous ZnO nanostructures containing a single large cavity. The microwave-assisted route consists of a short (about 2 min) temperature ramping stage (from room temperature to 120 °C) and a stage in which the temperature is maintained at 120 °C for 2 h. The structures produced by this route were 200-480 nm in diameter. The morphological yields of this method were very high. The temperature- and time-dependent evolution of the synthesized powders and the effects of an additive, vitamin C, were studied. Spherical amorphous/polycrystalline structures (70-170 nm in diameter), which appeared transitorily, may play a key role in the formation of the single crystalline porous hollow ZnO nanostructures. Studies and characterization of the nanostructures suggested a possible mechanism for formation of the quasi-single crystalline porous ZnO nanostructures with an interior space. 相似文献
9.
Heating values of oily mill sludges were measured and calculated. The calculated values with conventional equations showed severe discrepancies with measured ones. Most of the oxygen was confirmed to be associated with iron rather than with combustibles by a series of experiments such as proximate analysis, ultimate analysis, thermal analysis and chemical analysis. The heating value of the sludge was predicted well by using a modified Dulong's equation which ignores the oxygen content in the sludge. 相似文献
10.
Kun-Hong Liu Author Vitae Bo Li Author Vitae Author Vitae Ji-Xiang Du Author Vitae 《Pattern recognition》2009,42(7):1274-1283
Independent component analysis (ICA) has been widely used to tackle the microarray dataset classification problem, but there still exists an unsolved problem that the independent component (IC) sets may not be reproducible after different ICA transformations. Inspired by the idea of ensemble feature selection, we design an ICA based ensemble learning system to fully utilize the difference among different IC sets. In this system, some IC sets are generated by different ICA transformations firstly. A multi-objective genetic algorithm (MOGA) is designed to select different biologically significant IC subsets from these IC sets, which are then applied to build base classifiers. Three schemes are used to fuse these base classifiers. The first fusion scheme is to combine all individuals in the final generation of the MOGA. In addition, in the evolution, we design a global-recording technique to record the best IC subsets of each IC set in a global-recording list. Then the IC subsets in the list are deployed to build base classifier so as to implement the second fusion scheme. Furthermore, by pruning about half of less accurate base classifiers obtained by the second scheme, a compact and more accurate ensemble system is built, which is regarded as the third fusion scheme. Three microarray datasets are used to test the ensemble systems, and the corresponding results demonstrate that these ensemble schemes can further improve the performance of the ICA based classification model, and the third fusion scheme leads to the most accurate ensemble system with the smallest ensemble size. 相似文献