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Jian-Hua Zheng Piyapong Niamsup 《Journal of Mathematical Analysis and Applications》2009,354(1):177-183
In this paper we characterize the relation between two entire functions which are permutable and satisfy certain algebraic differential equations. 相似文献
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Izabela Jurewicz Alice A. K. King Patnarin Worajittiphon Piyapong Asanithi Eric W. Brunner Richard P. Sear Thomas J. C. Hosea Joseph L. Keddie Alan B. Dalton 《Macromolecular rapid communications》2010,31(7):609-615
Natural materials, such as bone and spider silk, possess remarkable properties as a result of sophisticated nanoscale structuring. They have inspired the design of synthetic materials whose structure at the nanoscale is carefully engineered or where nanoparticles, such as rods or wires, are self‐assembled. Although much work has been done in recent years to create ordered structures using diblock copolymers and template‐assisted assembly, no reports describe highly ordered, three‐dimensional nanotube arrays within a polymeric material. There are only reports of two‐dimensional network structures and structures on micrometer‐size scales. Here, we describe an approach that uses plasticized colloidal particles as a template for the self‐assembly of carbon nanotubes (CNTs) into ordered, three‐dimensional networks. The nanocomposites can be strained by over 200% and still retain high conductivity when relaxed. The method is potentially general and so may find applications in areas such as sensing, photonics, and functional composites.
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In this paper, we investigate the stability of time-varying switched systems with time-varying delay. We first give a generalization of Halanay’s inequality and then use this inequality to obtain sufficient conditions for the stability of switched systems. 相似文献
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Conversion enhancement of tubular fixed-bed reactor for Fischer-Tropsch synthesis using static mixer
Phavanee Narataruksa Sabaithip Tungkamani Karn Pana-Suppamassadu Phongsak Keeratiwintakorn Siriluck Nivitchanyong Piyapong Hunpinyo Hussanai Sukkathanyawat Prayut Jiamrittiwong Visarut Nopparat 《天然气化学杂志》2012,(4):435-444
Recently,Fischer-Tropsch synthesis(FTS) has become an interesting technology because of its potential role in producing biofuels via Biomassto-Liquids(BTL) processes.In Fischer-Tropsch(FT) section,biomass-derived syngas,mainly composed of a mixture of carbon monoxide(CO) and hydrogen(H2),is converted into various forms of hydrocarbon products over a catalyst at specified temperature and pressure.Fixed-bed reactors are typically used for these processes as conventional FT reactors.The fixed-bed or packed-bed type reactor has its drawbacks,which are heat transfer limitation,i.e.a hot spot problem involved highly exothermic characteristics of FT reaction,and mass transfer limitation due to the condensation of liquid hydrocarbon products occurred on catalyst surface.This work is initiated to develop a new chemical reactor design in which a better distribution of gaseous reactants and hydrocarbon products could be achieved,and led to higher throughput and conversion.The main goal of the research is the enhancement of a fixed-bed reactor,focusing on the application of KenicsTM static mixer insertion in the tubular packed-bed reactor.Two FTS experiments were carried out using two reactors i.e.,with and without static mixer insertion within catalytic beds.The modeled syngas used was a mixed gas composed of H2/CO in 2:1 molar ratio that was fed at the rate of 30mL(STP)min1(GHSV≈136mL g1 cat h1) into the fixed Ru supported aluminum catalyst bed of weight 13.3g.The reaction was carried out at 180℃ and atmospheric pressure continuously for 36h for both experiments.Both transient and steady-state conversions(in terms of time on stream) were reported.The results revealed that the steady-state CO conversion for the case using the static mixer was approximately 3.5 times higher than that of the case without static mixer.In both cases,the values of chain growth probability of hydrocarbon products(α) for Fischer-Tropsch synthesis were 0.92 and 0.89 for the case with and without static mixer,respectively. 相似文献
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Threrawee Sanglaow Pattanan Oungkanitanon Piyapong Asanithi Thana Sutthibutpong 《Molecules (Basel, Switzerland)》2021,26(10)
The selectivity in the simultaneous detection of ascorbic acid (AA), dopamine (DA), and uric acid (UA) has been an open problem in the biosensing field. Many surface modification methods were carried out for glassy carbon electrodes (GCE), including the use of graphene oxide and amino acids as a selective layer. In this work, molecular dynamics (MD) simulations were performed to investigate the role of serine oligomers on the selectivity of the AA, DA, and UA analytes. Our models consisted of a graphene oxide (GO) sheet under a solvent environment. Serine tetramers were added into the simulation box and were adsorbed on the GO surface. Then, the adsorption of each analyte on the mixed surface was monitored from MD trajectories. It was found that the adsorption of AA was preferred by serine oligomers due to the largest number of hydrogen-bond forming functional groups of AA, causing a 10-fold increase of hydrogen bonds by the tetraserine adsorption layer. UA was the least preferred due to its highest aromaticity. Finally, the role of hydrogen bonds on the electron transfer selectivity of biosensors was discussed with some previous studies. AA radicals received electrons from serine through hydrogen bonds that promoted oxidation reaction and caused the negative shifts and separation of the oxidation potential in experiments, as DA and UA were less affected by serine. Agreement of the in vitro and in silico results could lead to other in silico designs of selective layers to detect other types of analyte molecules. 相似文献
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We characterize the Julia sets of certain exponential functions. We show that the Julia sets J(Fλn) of Fλn(z) = λnezn where λn > 0 is the whole plane
, provided that limk → ∞ Fkλn(0) = ∞. In particular, this is true when λn are real numbers such that
. On the other hand, if
, then J(Fλn) is nowhere dense in
and is the complement of the basin of attraction of the unique real attractive fixed point of Fλn. We then prove similar results for the functions[formula] where λi
− {0}, 1 ≤ i ≤ n + 1, aj > 1, 1 ≤ j ≤ n, and m, n ≥ 1. 相似文献
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