排序方式: 共有60条查询结果,搜索用时 0 毫秒
1.
The basic physicochemical principles of preparation of emulsion fuel compositions based on heavy and extra-heavy crude cuts
were analyzed with consideration of the nature and content of the phases constituting the emulsion, type of chemical additives
— emulsifiers and stabilizers, and type of equipment for production of emulsion fuels.
__________
Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 5, pp. 51–56, September–October, 2007. 相似文献
2.
3.
Wooyoung Kim Pil Kim Ji Bong Joo Hyun Khil Shin Kwang S. Jung Jongheop Yi 《Journal of Electroceramics》2006,17(2-4):679-682
Porous carbon materials with a cylindrical pore structure were prepared using ordered mesoporous silica as a removable template.
To investigate the effect of the structural and textural properties of the products on hydrogen adsorption capacity, different
carbon precursors and synthetic methods were used in their preparation. All of the carbon materials prepared showed a well-defined
pore structure with a high surface area irrespective of the carbon precursor used in the preparation. Hydrogen adsorption
tests indicated that the capacity of the materials for hydrogen adsorption was highly dependent on total surface area and
the pore structure. Based on the N2 sorption results, the total surface area was directly correlated with the hydrogen adsorption capacity. 相似文献
4.
Musarat Amina Touseef Amna Mallick Shamshi Hassan Nawal Musayeib Al Musayeib Salem Slayyem Salem Al-Deyab Myung-Seob Khil 《Korean Journal of Chemical Engineering》2016,33(11):3169-3174
Pure water is the fundamental requisite for human life. The water has been recycled naturally but not in an adequate amount for consumption. Nanotechnology with extraordinary applications provides competent ways for the decontamination of contaminated water. In the present study MnWO4 nanoflowers endorsed with inherent antibacterial activity were successfully synthesized by facile hydrothermal approach. XRD, SEM, EDX spectroscopy and UVDRS were used to characterize the as-synthesized nanoflowers. Gram negative Escherichia coli ATCC 52922 bacterium was used as model organism to test antibacterial activity of as-synthesized MnWO4 nanoflowers. This study was conducted to optimize minimum concentration of MnWO4 nanoflowers and maximum contact time required to achieve complete inactivation of bacteria present in contaminated water. Minimum inhibitory concentration (MIC) of MnWO4 nanoflowers was found to be 10 μg/ml. The assessment and interpretation of bacterial viability was done using dual fluorescent staining. The synthesized 3D-nanoflowers were found as potent bactericides. Thus, MnWO4 nanoflowers emerged to be very good future material for disinfection of biological pollutants present in the contaminated water reservoirs and as an anti-biofouling agent. 相似文献
5.
M. Shamshi Hassan Touseef Amna O-Bong Yang Hyun-Chel Kim Myung-Seob Khil 《Ceramics International》2012,38(7):5925-5930
In the present study rare earth doped (Ln3+–TiO2, Ln = La, Ce and Nd) TiO2 nanofibers were prepared by the sol–gel electrospinning method and characterized by XRD, SEM, EDX, TEM, and UV-DRS. The photocatalytic activity of the samples was evaluated by Rhodamine 6G (R6G) dye degradation under UV light irradiation. XRD analysis showed that all the synthesized pure and doped titania nanofibers contain pure anatase phase at 500 °C but at 700 °C it shows both anatase and rutile phase. XRD result also shows that Ln3+-doped titania probably inhibits the phase transformation. The diameter of nanofibers for all samples ranges from 200 to 700 nm. It was also observed that the presence of rare-earth oxides in the host TiO2 could decrease the band gap and accelerate the separation of photogenerated electron–hole pairs, which eventually led to higher photocatalytic activity. To sum up, our study demonstrates that Ln3+-doped TiO2 samples exhibit higher photocatalytic activity than pure TiO2 whereas Nd3+-doped TiO2 catalyst showed the highest photocatalytic activity among the rare earth doped samples. 相似文献
6.
M. Shamshi Hassan Touseef Amna Faheem A. Sheikh Salem S. Al-Deyab Kyung Eun Choi I.H. Hwang Myung-Seob Khil 《Ceramics International》2013
The objective of this study was to develop a new class of bimetallic ZnO/Ag embedded polyurethane multi-functional nanocomposite by a straightforward approach. Bimetallic nanomaterials, composed of two unlike metal elements, are of greater interest than the monometallic materials because of their improved characteristics. In the present study the bimetallic composite was prepared using sol–gel via the facile electrospinning technique. The utilized sol–gel was composed of zinc oxide, silver and poly(urethane). The physicochemical properties of as-spun composite mats were determined by X-ray diffraction pattern, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy and transmission electron microscopy. The antibacterial activity was tested using Escherichia coli as model organism. The antibacterial test showed that ZnO:Ag/polyurethane composite possesses superior antimicrobial activity than pristine PU and ZnO/PU hybrids. Furthermore, our results illustrate that the synergistic effect of ZnO and Ag resulted in the advanced antimicrobial action of bimetallic ZnO/Ag composite mat. The viability and proliferation properties of NIH 3T3 mouse fibroblast cells on the ZnO:Ag/polyurethane composite nanofibers were analyzed by in vitro cell compatibility test. Our results indicated the non-cytotoxic behavior of bimetallic ZnO:Ag/polyurethane nanofibers towards the fibroblast cell culture. In summary, novel ZnO:Ag/polyurethane composite nanofibers which possess large surface to volume ratio with excellent antimicrobial activity were fabricated. The unique combination of ZnO and Ag nanoparticles displayed potent bactericidal effect due to a synergism. Hence the electrospun bimetallic composite indicates the huge potential in water filtration, clinical and biomedical applications. 相似文献
7.
8.
A. S. Tukachinsky L. G. Askinazi I. M. Balachenkov A. A. Belokurov D. B. Gin N. A. Zhubr V. A. Kornev S. V. Lebedev E. M. Khil’kevich I. N. Chugunov A. E. Shevelev 《Technical Physics Letters》2016,42(12):1167-1169
Studying the mechanism of Alfvén wave generation in plasma is important, since the interaction of these waves with energetic particles in tokamak-type reactors can increase the losses of energy and particles with the corresponding decrease in the efficiency of plasma heating and, under certain conditions, lead to the damage of structural elements of the system. Despite the previous detailed investigations of the excitation of Alfvén waves by superthermal particles in regimes with additional heating, the physics of Alfvén mode generation in discharges with ohmic heating of plasma is still not sufficiently studied. We have established that a significant factor inf luencing the development of Alfvén oscillations in ohmic discharge is the presence of runaway electrons. A physical mechanism explaining this relationship is proposed. 相似文献
9.
The use of natural polymers that form complexes with drug preparations is promising in the development of drugs of new generation. The possibility of complex formation on the interaction of humic acid salts with papaverine, benzohexonium, and B-group vitamins was demonstrated by calorimetric and potentiometric titration. These interactions can occur between the charged groups of a humic acid macroanion and the positively charged centers of drug molecules. The degree of binding of drug preparations by a natural polymer macromolecule can be determined by the charge and the structure of their molecules. 相似文献
10.
It was demonstrated by a gas-volumetric method that humic acids from brown coal exhibit pronounced antioxidant properties, being the effective inhibitors of the model reactions of initiated radicalchain oxidation of hydrocarbons (cumene and ethylbenzene). This makes it possible to recommend humic acids for use as effective antioxidants for technical purposes and as promising biologically active natural antioxidants for the development of new classes of pharmaceuticals for medicine. 相似文献