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4.175 Aktuelle Fachpublikationen zum Thema temperature

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Materials, Vol. 7, Pages 7533-7547: Assessment of Pozzolanic Activity Using Methods Based on the Measurement of Electrical Conductivity of Suspensions of Portland Cement and Pozzolan

21.11.2014 | Velázquez, Sergio ; Monzó, José M.; Borrachero, María V.; Payá, Jordi, Materials, 2014

The use of methods based on measuring electrical conductivity to assess pozzolanic activity has recently been used primarily in aqueous suspensions of pozzolan: calcium hydroxide. However, the use of similar methods in suspensions of cement with pozzolans has not been widely studied. This paper ...

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Free Energy Simulations of Active-Site Mutants of Dihydrofolate Reductase

21.11.2014 | Dvir Doron; Vanja Stojković; Lokesh Gakhar; Alexandra Vardi-Kilshtain; Amnon Kohen; Dan Thomas Major, Journal of Physical Chemistry B, 2014

This study employs hybrid quantum mechanics–molecular mechanics (QM/MM) simulations to investigate the effect of mutations of the active-site residue I14 of E. coli dihydrofolate reductase (DHFR) on the hydride transfer. Recent kinetic measurements of the I14X mutants (X = V, A, and G) indicated ...

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High Temperature X-ray Diffraction Study of the Oxidation Products and Kinetics of Uranium–Plutonium Mixed Oxides

20.11.2014 | Michal Strach; Renaud C. Belin; Jean-Christophe Richaud; Jacques Rogez, Inorganic Chemistry, 2014

The oxidation products and kinetics of two sets of mixed uranium–plutonium dioxides containing 14%, 24%, 35%, 46%, 54%, and 62% plutonium treated in air were studied by means of in situ X-ray diffraction (XRD) from 300 to 1773 K every 100 K. The first set consisted of samples annealed 2 weeks ...

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Effects of β‐nucleating agent and crystallization conditions on the crystallization behavior and polymorphic composition of isotactic polypropylene/multi‐walled carbon nanotubes composites

19.11.2014 | Jian Kang, Jinghan He, Zhengfang Chen, Feng Yang, Jinyao Chen, Ya Cao, Ming Xiang, Polymers for Advanced Technologies, 2014

In this study, the effects of crystallization conditions (cooling rate and end temperature of cooling) on crystallization behavior and polymorphic composition of isotactic polypropylene/multi‐walled carbon nanotubes (iPP/MWCNTs) composites nucleated with different concentrations of β‐nucleating ...

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Heterogeneous Carbon Gels: N-Doped Carbon Xerogels from Resorcinol and N-Containing Heterocyclic Aldehydes

19.11.2014 | Wojciech Kiciński; Małgorzata Norek; Bartłomiej J. Jankiewicz, Langmuir, 2014

Direct, acid (HCl) initiated sol–gel polycondensation of resorcinol with pyrrole-2-carboxaldehyde or its derivative N-methyl-2-pyrrolecarboxaldehyde yields thermosetting phenolic organic gels with N-content of up to 8.4 wt %. After carbonization, sturdy monoliths of N-doped carbon xerogels with ...

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Carotenoid‐Cleavage Activities of Crude Enzymes from Pandanous amryllifolius

18.11.2014 | Andriati Ningrum, Matthias Schreiner, Chemistry & Biodiversity, 2014

Abstract Carotenoid degradation products, known as norisoprenoids, are aroma‐impact compounds in several plants. Pandan wangi is a common name of the shrub Pandanus amaryllifolius. The genus name ‘Pandanus’ is derived from the Indonesian name of the tree, pandan. In Indonesia, the leaves from ...

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Dynamic Response of Anchored Poly(N‐isopropylacrylamide‐co‐methacrylic acid‐co‐benzophenone methacrylate) Terpolymer Hydrogel Layers to Physicochemical Stimuli

18.11.2014 | Maria Gianneli, Ilke Anac, Robert Rostkamp, Bernhard Menges, Benoit Loppinet, Uli Jonas, Wolfgang Knoll, George Fytas, Macromolecular Chemistry and Physics, 2014

The use of responsive thin hydrogel films as the active matrix in sensor applications requires detailed knowledge of their structural and dynamical properties and their responsiveness to external conditions. Here, the structure and dynamics in photo‐crosslinked, surface‐attached films (≈1 μm dry ...

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A Route to Stereochemically Pure Benzyllithium Reagents by Stereocontrolled Epimerisation

18.11.2014 | Stephan G. Koller, Ulrike Kroesen, Carsten Strohmann, Chemistry - A European Journal, 2014

Abstract Alkyllithium compounds are not generally stable at room temperature, therefore strategies were established to overcome this limitation. We present a systematic approach to obtain a stereochemically enriched benzyllithium compound, starting with the simple addition of a chiral ...

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Synthesis of Halo‐Enol Phostones by Using DMAP‐Catalyzed Halocyclization of Alkynylphosphonic Monoesters

17.11.2014 | Jiale Huang, Haiyang Wang, Ai‐Yun Peng, European Journal of Organic Chemistry, 2014

Abstract A new class of non‐benzo halo‐enol phostones was synthesized by using a DMAP‐catalyzed [DMAP = 4‐(dimethylamino)pyridine] halocyclization reaction of 4‐pentynylphosphonic monoesters with N‐bromosuccinimide (NBS) or N‐iodosuccinimide (NIS) in CHCl3 at room temperature. DMAP was ...

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Rheology of Diluted Heavy Crude Oil Saturated with Carbon Dioxide

17.11.2014 | Ruien Hu; John P. Crawshaw; J. P. Martin Trusler; Edo S. Boek, Energy & Fuels, 2014

The viscosity of heavy crude oils strongly affects their producibility and recovery from oil reservoirs. Thus, the viscosity of heavy crude oils with dissolved gases at different shear rates is valuable knowledge for heavy crude oil exploitation. However, most publications only present viscosity ...

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