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261.
Csaba Tóth Péter Baladincz Sándor Kovács Jenő Hancsók 《Clean Technologies and Environmental Policy》2011,13(4):581-585
The goal of our investigation was the production of partially bio-derived fuels in the gas oil boiling point range. Our aim
was the production of diesel fuel blending components by co-hydrogenation of mixtures of high-sulphur gas oil (about 1.0%)
and vegetable oil raw materials with different vegetable oil contents (0, 5, 15, 25 and 100%). The experiments were carried
out on a NiMo/Al2O3 catalyst with a targeted composition (T = 300–380°C, P = 60–80 bar, LHSV = 1.0/h and H2/HC = 600 Nm3/m3). We obtained that both the vegetable oil conversion reactions and the gas oil quality improvement reactions took place.
Under the favourable operational conditions (360–380°C, P = 80 bar, LHSV = 1.0/h and H2/HC = 600 Nm3/m3 and up to 15% vegetable oil content of the feed), the main properties of the high-yield (>90%) products except for the Cold
Filter Plugging Point (CFPP) value satisfied the requirements of the standard of diesel fuels (EN 590:2009). The amount of
vegetable oil higher than 15% reduced the desulphurization efficiency, because of the intake of large quantities of oxygen
with the triglyceride molecules of the vegetable oil. The products—depending on the vegetable oil content of the feedstocks—have
an increased n- and i-paraffin content, so their combustion properties are very favourable, and the emission of particles
is lower. 相似文献
262.
Etelka Pstyni Andrea Kovcs-Valasek Pter Urbn Lilla Czuni Gyrgy Stl Jr. Csaba Fekete Robert Gabriel 《International journal of molecular sciences》2021,22(13)
As neurotransmitter, GABA is fundamental for physiological processes in the developing retina. Its synthesis enzymes are present during retinal development, although the molecular regulatory mechanisms behind the changes in expression are not entirely understood. In this study, we revealed the expression patterns of glutamic acid decarboxylase 67(GAD67) and its coding gene (GAD1) and its potential miRNA-dependent regulation during the first three postnatal weeks in rat retina. To gain insight into the molecular mechanisms, miRNA-sequencing supported by RT-qPCR and in situ hybridization were carried out. GAD1 expression shows an increasing tendency, peaking at P15. From the in silico-predicted GAD1 targeting miRNAs, only miR-23 showed similar expression patterns, which is a known regulator of GAD1 expression. For further investigation, we made an in situ hybridization investigation where both GAD67 and miR-23 also showed lower expression before P7, with the intensity of expression gradually increasing until P21. Horizontal cells at P7, amacrine cells at P15 and P21, and some cells in the ganglion cell layer at several time points were double labelled with miR-23 and GAD67. Our results highlight the complexity of these regulatory networks and the possible role of miR-23 in the regulation of GABA synthesizing enzyme expression during postnatal retina development. 相似文献
263.
Platinum-based chemotherapies, such as cisplatin, play a large role in cancer treatment. The development of resistance and treatment toxicity creates substantial barriers to disease control, yet. To enhance the therapeutic index of cisplatin-based chemotherapy, it is imperative to circumvent resistance and toxicity while optimizing tumor sensitization. One of the primary mechanisms by which cancer cells develop resistance to cisplatin is through upregulation of DNA repair pathways. In this review, we discuss the DNA damage response in the context of cisplatin-induced DNA damage. We describe the proteins involved in the pathways and their roles in resistance development. Common biomarkers for cisplatin resistance and their utilization to improve patient risk stratification and treatment personalization are addressed. Finally, we discuss some of the current treatments and future strategies to circumvent the development of cisplatin resistance. 相似文献
264.
Stephan Breitkreutz Josef Kiermaier Cenk Yilmaz Xueming Ju Gy?rgy Csaba Doris Schmitt-Landsiedel Markus Becherer 《Journal of Computational Electronics》2011,10(4):352-359
In this paper we investigate error rates of nanomagnetic logic devices with perpendicular magnetization by compact modeling.
Two different types of nanomagnets for information propagation and logic computing are introduced. The switching behavior
of field-coupled nanomagnets is measured and analyzed. A compact model is derived from physics and experimental results are
applied to the magnetic compact model. General requirements for fabrication parameters and clocking fields for reliable operation
are extracted. We perform simulations and measurements on single devices to demonstrate the accuracy of the macromodel. Simulations
on complex systems show that the error rate of a field-coupled magnetic system strongly depends on the variation of the switching
field and the strength of the coupling field between the nanomagnets. The error rate of a 1-bit full adder is investigated
for varying dot parameters. The results demonstrate the importance of fast simulation tools for investigations on the design
of nanomagnetic computing devices and systems. 相似文献
265.
Thermal transport in MWCNT sheets and yarns 总被引:2,自引:0,他引:2
Ali E. Aliev Csaba Guthy Mei Zhang Shaoli Fang Anvar A. Zakhidov John E. Fischer Ray H. Baughman 《Carbon》2007,45(15):2880-2888
Laser flash and self-heating 3ω techniques were employed to determine the anisotropic thermal conductivity and thermal diffusivity of a highly oriented, free-standing multiwalled carbon nanotube (MWCNT) sheet and a yarn drawn from a sidewall of the MWCNT forest grown by chemical-vapor deposition. Normalized to ideal high density structure the thermal conductivity and the thermal diffusivity along the alignment are 50 ± 5 W/m K and 45 ± 5 mm2/s, respectively, and are mostly limited by dangling terminals of bundles, intrinsic defects of individual nanotubes and phonon scattering within the bundles, which form the supporting matrix of the MWCNT sheet. The high degree of tube–tube overlap substantially decreases the electrical and thermal interconnection resistance, which usually dominates in randomly deposited mat-like nanotube assemblies. The extremely high surface area of the MWCNT sheet leads to excessive radial heat radiation that does not allow transferring the heat energy along the MWCNT sheet by means of phonons to distances >2 mm. On the other hand, the high surface area and negligible heat capacitance make it a perfect material for bolometric sensing (r = 38 V/W) and heat dissipation. 相似文献
266.
267.
Melinda Szaloki Jozsef Gall Katalin Bukovinszki Janos Borbely Csaba Hegedus 《Reactive and Functional Polymers》2013,73(3):465-473
Reactive polymeric nanoparticles were formed for reinforcement of photocurable dental resin. Cross-linked polymeric nanoparticles were synthesized by emulsion polymerization of mono- (methyl methacrylate; MMA) and trifunctional (trimethylol propane trimethacrylate; TMPTMA) monomers. The nanoparticles were dispersed in bisphenol A glycol dimethacrylate (Bis-GMA) based dental resin matrix in the range of 5–25 wt% to form photocurable nanocomposites.The effect of reactive polymeric particles on the mechanical properties of photocurable dental resin was investigated. Polymerization shrinkage, polymerization shrinkage stress, viscosity, diametral tensile strength, compressive, and flexural strength of the nanocomposites have been studied.It was observed that the cross-linked nanoparticles significantly influenced the mechanical properties of the reinforced dental resin nanocomposites. 相似文献
268.
In this paper we provide an integrated presentation of applications, technologies and business models for wireless community network together with design considerations and examples. An overview is given of the state-of-the-affairs of wireless community networks. Driving forces and stakeholders of the projects and the applications and services will be presented for some carefully selected cases. We suggest a design methodology and illustrate its application to an ongoing digital city project in Hungary. Relevant business models are also analyzed. 相似文献
269.
Csaba Somlai Levente Nyerges Botond Penke Pter Hegyes Wolfgang Voelter 《Advanced Synthesis \u0026amp; Catalysis》1994,336(5):429-433
Theoretical calculations on different xanthene derivatives and related structures were performed and as a result conclusions could be drawn for the acid-lability of substituted xanthenes. (9-Hydroxyxanthene-3-oxy)acetic- and valeric acid ( 6a and 6b ) were selected, synthesized in a six-step route, and 6b was tested for its applicabiliy as a handle for solid phase synthesis of peptides. 相似文献