排序方式: 共有199条查询结果,搜索用时 187 毫秒
31.
Ayça Tunçel Kasim Ocakoglu Suleyman Gokhan Colak Osman Yılmaz İsmail Öztürk Fatma Yurt 《Journal of Radioanalytical and Nuclear Chemistry》2018,315(3):487-492
Effective antimicrobial compounds are necessary due to increased resistance of antibiotics against microorganisms causing infectious diseases. In this study, imidazolium-TFSI salt [ITFSI: octyl-bis(3-methylimidazolium)-di(bis(trifluoromethane)sulfonimide)] was labeled with 131I with high efficiency. In vitro uptake experiments of 131I-ITFSI showed high uptake in gram-positive Staphylococcus aureus bacteria. 131I-ITFSI was also evaluated for comparison between bacterial infection and sterile inflammation by in vivo studies. The biodistribution results revealed that 131I-ITFSI might be used as a nuclear imaging agent for detection of bacterial infection. 相似文献
32.
Fatih Güleç Aysun Özen Aysel Niftaliyeva Ayşe Aydın Emir Hüseyin Şimşek Ali Karaduman 《Research on Chemical Intermediates》2018,44(1):55-67
2,6-Dimethylnaphthalene is an important dimethylnaphthalene isomer which can be used in the production of polyethylene naphthalate. The novelty of this study is to reveal Langmuir–Hinshelwood and Eley–Rideal reaction rate equations for the methylation of naphthalene over Fe/ZSM-5 zeolite catalysts besides the proposed reaction rate equation. To investigate the kinetics and mechanisms of naphthalene methylation, the methylation experiments were carried out in a gas–solid catalytic fixed-bed reactor in the presence of Fe/ZSM-5 zeolite catalysts at two different temperatures (450 and 500 °C) and five different weight hourly space velocities (0.5, 1.0, 1.5, 2.0, 2.5, 3.0 h?1). A naphthalene:methanol:1,2,4-trimethyl benzene mixture having a 1:3:10 molar ratio was used as a feed stream. The methylation products were identified by using GC–MS. For the methylation kinetics of naphthalene, the reaction rates depending on the naphthalene and methanol concentration were determined. Furthermore, the effects of temperature and weight hourly space velocity on the conversion of naphthalene, the selectivity of 2,6-dimethylnaphthalene, and the ratio of 2-methylnaphthalene/1-methylnaphthalene were determined. The results of this study demonstrate that the Langmuir–Hinshelwood reaction mechanism for naphthalene methylation is more compatible at 450 °C and the Eley–Rideal reaction mechanism at 500 °C. Moreover, in addition to 2,6-dimethylnaphthalene, other dimethylnaphthalene and tri-methylnaphthalene isomers were formed in the methylation of naphthalene. The conversion of naphthalene reached approximately 70%. Moreover, the highest selectivity of 2,6-dimethylnaphthalene was almost 40%. The ratios of 2-methylnaphthalene/1-methylnaphalene demonstrate that the methylation of naphthalene to 2-methynaphthalene is much higher than to 1-methynaphthalene. 相似文献
33.
Nebahat Değirmenbaşı Beytiye Özgün 《Monatshefte für Chemie / Chemical Monthly》2002,133(11):1417-1421
Summary. A new chromium(VI) reagent, quinoxalinium dichromate ([C8H6N2H]2Cr2O7, QxDC), was prepared by reacting quinoxaline with CrO3 in water. QxDC oxidizes primary and secondary alcohols and oximes to the corresponding carbonyl compounds, and anthracene to anthraquinone.
Corresponding author. E-mail: beytiyeozgun@hotmail.com
Received February 2, 2002; accepted April 3, 2002 相似文献
34.
Hakan Özcan 《Heat and Mass Transfer》2011,47(5):571-577
The exergy analysis of an air-standard Otto cycle with heat transfer loss is analyzed by using finite-time thermodynamics.
The results showed that the heat transfer loss is responsible for a significant destruction of exergy. It is also shown that
exergy efficiency and maximum power output increase with decreasing heat transfer loss. The results obtained in this paper
may provide useful information for the maximum work available. 相似文献
35.
In this paper, we introduce the Euler sequence space e
r
(p) of nonabsolute type and prove that the spaces e
r
(p) and l(p) are linearly isomorphic. Besides this, we compute the α-, β- and γ-duals of the space e
r
(p). The results proved herein are analogous to those in [ALTAY, B.—BASŠAR, F.: On the paranormed Riesz sequence spaces of non-absolute type, Southeast Asian Bull. Math. 26 (2002), 701–715] for the Riesz sequence space r
q
(p). Finally, we define a modular on the Euler sequence space e
r
(p) and consider it equipped with the Luxemburg norm. We give some relationships between the modular and Luxemburg norm on this
space and show that the space e
r
(p) has property (H) but it is not rotund (R). 相似文献
36.
In manufacturing systems, batch building processes are very common, as goods are often transported or processed in batches and must therefore be collected before these transport or processing steps can occur. In this paper, we present a method for the performance analysis of general batch building processes in material flow systems under the timeout and capacity rules. The proposed model allows for stochastic collecting times and incorporates no restrictions with respect to the number of arriving units and their interarrival times. The accuracy of the discrete-time approach is demonstrated by comparing this approach with a discrete-event simulation model in continuous-time. Subsequently, the model is applied to two cases: a transportation case from the health care industry and the process of building a batch for a batch processor. 相似文献
37.
Yelda Bingöl Alpaslan Nevin Süleymanoğlu Emin Öztekin Ferda Erşahin Erbil Ağar Şamil Işık 《Journal of chemical crystallography》2010,40(11):950-956
Abstract
The molecular and crystal structure of the title compound, C14H11Cl2NO, has been determined by X-ray single crystal diffraction technique. The compound crystallizes in the orthorhombic, space group Pbca with unit cell dimensions a = 7.5537(10) ?, b = 11.5518(13) ?, c = 29.760(4) ?, M r = 280.14, V = 2596.8(6) ?3, Z = 8, R 1 = 0.065 and wR 2 = 0.191. The title compound exists in the enol–imine tautomeric form with a strong intramolecular O–H···N hydrogen bond. The dihedral angle between the two benzene rings is 37.66(15)°. The asymmetric unit in the crystal structure contains only one neutral molecule. Calculational studies were performed by using AM1, PM3, PM6 semi-empirical and DFT methods. Geometry optimizations of compound have been carried out by using three semi-empirical methods and DFT method and bond lengths, bond and torsion angles of title compound have been determined. Dipole moments (Debye) and the energy parameters of compound (kcal/mol) were calculated by using above mentioned calculation methods. Atomic charge distribution has been obtained from AM1, PM3, PM6 and DFT. In order to determine conformational flexibility on the molecule, molecular energy profile of the title compound was obtained with respect to the selected torsion angle T(N1–C7–C1–C2), which is varied from −180° to +180° in every 10 via PM3 semi-empirical method. 相似文献38.
Pre-crystalline graded rings constitute a class of rings which share many properties with classical crossed products. Given
a pre-crystalline graded ring
A\mathcal{A}
, we describe its center, the commutant
CA(A0)C_{\mathcal{A}}(\mathcal{A}_{0})
of the degree zero grading part, and investigate the connection between maximal commutativity of
A0\mathcal{A}_{0}
in
A\mathcal{A}
and the way in which two-sided ideals intersect
A0\mathcal{A}_{0}
. 相似文献
39.
Karl Lundengård Jonas Österberg Sergei Silvestrov 《Methodology and Computing in Applied Probability》2018,20(4):1417-1428
The value of the Vandermonde determinant is optimized over various surfaces, including the sphere, ellipsoid and torus. Lagrange multipliers are used to find a system of polynomial equations which give the local extreme points in its solutions. Using Gröbner basis and other techniques the extreme points are given either explicitly or as roots of polynomials in one variable. The behavior of the Vandermonde determinant is also presented visually in some interesting cases. 相似文献
40.
Tetrakis(selenodiazole)porphyrazine and its vanadyl (VO2+) complex have been prepared and characterized by FT-IR, UV–vis, and MALDI-MS. The magnetic properties of the complex have
been investigated by EPR spectroscopy. 相似文献