排序方式: 共有48条查询结果,搜索用时 15 毫秒
11.
Kinetics and Catalysis - In this study, Langmuir–Hinshelwood and Michaelis–Menten kinetic models are applied to describe the kinetic behaviour of the Co–B catalyst in the... 相似文献
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brahim Uar Figen Arslan Ahmet Bulut Hasan budak Hals
lmez Orhan Büyükgüngr 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(10):m523-m525
The crystal structure of the mononuclear title complex, [CuCl2(C10H8N4)(H2O)]·H2O, shows an s‐cis/E/s‐trans‐configured di‐2‐pyridyldiazene ligand, with the square‐pyramidal CuII ion coordinated to one pyridyl and one diazene N atom together with two Cl atoms and one aqua ligand. The crystal packing involves both hydrogen‐bonding and π–π interactions. The solvent water molecule links three monomers to one another through hydrogen‐bonding interactions in which two monomers are linked via chloro ligands and the third via the aqua ligand. Face‐to‐face and weak slipped π–π interactions also occur between di‐2‐pyridyldiazene moieties, and these interactions are responsible for the interchain packing. 相似文献
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Figen Çilingir Robert L. Devaney Elizabeth D. Russell 《Journal of Fixed Point Theory and Applications》2010,7(1):223-240
For polynomial maps in the complex plane, the notion of external rays plays an important role in determining the structure
of and the dynamics on the Julia set. In this paper we consider an extension of these rays in the case of rational maps of
the form Fλ(z) = z
n
+ λ/z
n
where n > 1. As in the case of polynomials, there is an immediate basin of ∞, so we have similar external rays. We show how to extend
these rays throughout the Julia set in three specific examples. Our extended rays are simple closed curves in the Riemann
sphere that meet the Julia set in a Cantor set of points and also pass through countably many Fatou components. Unlike the
external rays, these extended rays cross infinitely many other extended rays in a manner that helps determine the topology
of the Julia set. 相似文献
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We propose a new globalization strategy that can be used in unconstrained optimization algorithms to support rapid convergence from remote starting points. Our approach is based on using multiple points at each iteration to build a sequence of representative models of the objective function. Using the new information gathered from those multiple points, a local step is gradually improved by updating its direction as well as its length. We give a global convergence result and also provide the parallel implementation details accompanied with a numerical study. Our numerical study shows that the proposed algorithm is a promising alternative as a globalization strategy. 相似文献
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Aysel Kantürk Figen Osman İsmail Sabriye Pişkin 《Journal of Thermal Analysis and Calorimetry》2012,107(3):1177-1189
Devolatilization behavior of several types of agricultural stalks (sunflower, rice, corn, and wheat) was studied using thermogravimetric
system (TG) under nitrogen atmosphere at different heating rates (10, 15, and 20 °C min-1). Coats&Redfern, Horowitz&Metzger, and Arrhenius non-isothermal kinetic models were applied to calculate the devolatilization
kinetic parameters and the devolatilization rate equations have been established. In addition, the kinetic compensation effect
(KCE) has also been used to correlate pre-exponential factor (k
o) with activation energy (E
a) and an existence of the KCE is accepted. TG-FT/IR analyses were applied of the different stalks and FT/IR stack plot used
to analyze the devolatilization gas products (CO2, CH4, HCOOH, CH3OH). Infrared vibrational frequencies, micro structure and crystallinity of stalks were investigated by Fourier transform
infrared spectroscopy (FT/IR), scanning electron microscope (SEM), and X-ray diffraction analysis (XRD), respectively. 相似文献
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Designs, Codes and Cryptography - We consider the class of generalized algebraic geometry codes (GAG codes) formed by two collections of places, with places of the same degree in each collection.... 相似文献
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Aysel Kantürk Figen Ay?e ?ztürk Sabriye Pi?kin 《Research on Chemical Intermediates》2012,38(9):2343-2354
The presence of caustic soda in the spent sodium borohydride (NaBH4) fuel in high concentrations creates environmental problems associated with the transportation and the disposal of the fuel, orits recycling into NaBH4. It is clear that the high level of caustic soda in the spent fuel requires efficient and proper formulation of its industrial recycling applications. The present study regards the conversion process of the caustic soda present in high concentrations in spent NaBH4 fuels. Properties of the caustic used in NaBH4 fuel is characterized using a comprehensive technique. A specific application is presented here, which includes the treatment of the spent fuel solution with anhydrous borax (Na2B4O7) at 90?°C for 3?h followed by calcination after the crystallization, resulting in the conversion of this highly caustic spent NaBH4 fuel into sodium metaborate (NaBO2), which is an environmentally friendlier and an economically valuable material. 相似文献
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Halil Güler Figen Kurtuluş İmdat Kadan Ayşe Morkan Sebahat Akin 《Phosphorus, sulfur, and silicon and the related elements》2013,188(6):1371-1379
In this study, the sulfidization of Na2CO3 was investigated by using a solid-gas reaction under a sulfidizing gas mixture, which consisted of COS, CS2, and S2 gases. Sodium sulfide pentahydrate, Na2S·5H2O, was prepared from sodium carbonate, Na2CO3, via a sulfidizing gas mixture by a solid-gas reaction under the cooling of a nitrogen atmosphere. The observed phase was found to be the pentahydrated form of sodium sulfide. This crystalline form was determined by X-ray powder diffraction (XRD) technique. Since sodium sulfide is strongly hygroscopic, the pentahydrated crystalline form was observed in XRD measurements for all repeated experiments. The crystal unit cell parameters of the synthesized product were in excellent agreement with values given in the JCPDS card number 18-1249. The sodium sulfide pentahydrate has an orthorhombic crystal structure with the unit cell parameters of a = 6.475, b = 12.55, C = 8.655 Å, space group, Cmcm and Z = 4. 相似文献