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31.
A. B. Yur’ev N. Kh. Mukhatdinov O. P. Atkonova N. A. Kozyrev L. V. Korneva 《Steel in Translation》2010,40(4):382-383
To meet the demand for wear-resistant grinding balls at OAO Novokuznetskii Metallurgicheskii Kombinat (NKMK), the TT 14788411-93-2009
standard has been developed, and the production of ultrahard (80–100)-mm balls has been introduced. Surface and internal hardness
is ensured by using steel of elevated hardenability and by special heat treatment. 相似文献
32.
33.
Introducing functional classification theory to land use planning by means of decision tables 总被引:1,自引:0,他引:1
Frank Marc Antrop Peter Bogaert Philippe De Maeyer Ben Derudder Tijs Neutens Veronique Van Acker Nico Van de Weghe 《Decision Support Systems》2009,46(4):875
This paper contributes to the conceptualisation and analysis of double-sided matching problems, taking the land use planning problem as an example. It does so by introducing functional classification theory at the knowledge level, the symbol level and the system level of a DSS. This theory explicitly expresses the methodological viewpoint of relational realism. At the knowledge level this implies defining knowledge on the basis of matching the intension and extension of concepts. At the symbol level it deals with knowledge representation and here decision tables are advanced and formally introduced. At the system level the formalism used at the symbol level is implemented to develop a relational matching DSS. 相似文献
34.
35.
Pierre Blaise Veronique Tropini Marie Farines Robert L. Wolff 《Journal of the American Oil Chemists' Society》1997,74(2):165-168
The positional distribution of various Δ5-acids in the seed triacylglycerols from several conifer species has been established
after partial chemical degradation with Grignard reagent. The species studied were representative of four conifer families
and were specially selected for their particularly high Δ5-acid contents. These species were Taxus baccata (Taxaceae; 5,9-18:2 acid, 11.9%), Larix decidua (Pinaceae; 5,9,12-18:3 acid, 28.5%), Sciadopytis verticillata (Taxodiaceae; 5,11,14-20:3 acid, 16.7%), and Juniperus communis (Cupressaceae; 5,11,14,17-20:4 acid, 19.8%). Calculations from the fatty acid compositions of triacylglycerols and of the
mixture of 1,2- and 2,3-diacylglycerols generated by the Grignard reagent indicated that, for the four species, there was
a considerable enrichment of Δ5-acids (generally more than ten times) in the 1,3-positions as compared to the 2-position,
where Δ5-acids represented always less than 2% of total fatty acids esterified to triacylglycerols. This distribution was
practically independent from the species (four families studied), the chainlength (18 or 20 carbon atoms), and the number
of ethylenic bonds (two to four) in the Δ5-acids. Similar distributions were established for triacylglycerols from the seeds
of three pine species that are available on a ton-scale: Pinus pinea, P. koraiensis, and P. pinaster. These observations confirm and extend previous studies conducted with other conifer species by similar techniques or by
13C-nuclear magnetic resonance spectroscopy. Consequently, the almost exclusive location of Δ5-acids in the external positions
of triacylglycerols is now well established and appears to be a general feature of conifer seed oils. 相似文献
36.
Mohsen Akbari Ali Tamayol Veronique Laforte Nasim Annabi Alireza Hassani Najafabadi Ali Khademhosseini David Juncker 《Advanced functional materials》2014,24(26):4060-4067
The fabrication of cell‐laden structures with anisotropic mechanical properties while having a precise control over the distribution of different cell types within the constructs is important for many tissue engineering applications. Automated textile technologies for making fabrics allow simultaneous control over the color pattern and directional mechanical properties. The use of textile techniques in tissue engineering, however, demands the presence of cell‐laden fibers that can withstand the mechanical stresses during the assembly process. Here, the concept of composite living fibers (CLFs) in which a core of load bearing synthetic polymer is coated by a hydrogel layer containing cells or microparticles is introduced. The core thread is drawn sequentially through reservoirs containing a cell‐laden prepolymer and a crosslinking reagent. The thickness of the hydrogel layer increases linearly with to the drawing speed and the prepolymer viscosity. CLFs are fabricated and assembled using regular textile processes including weaving, knitting, braiding, winding, and embroidering, to form cell‐laden structures. Cellular viability and metabolic activity are preserved during CLF fabrication and assembly, demonstrating the feasibility of using these processes for engineering functional 3D tissue constructs. 相似文献
37.
Dur Jeanne-chantal Rama Rachel Mougin Christian Chaplain Veronique 《Polycyclic Aromatic Compounds》2013,33(1-4):143-154
The efficiency of soil remediation is often limited by the low aqueous solubility of Polycyclic Aromatic Hydrocarbons, PAHs. Surfactants can then be used to enhance the removal of PAHs from soils. The dissolution of pure solid deposit of benzo(a)pyrene, B(a)P, has shown that cationic surfactants are the most efficient to increase the aqueous solubility of B(a)P, when compared to neutral or anionic surfactants. In this paper we compare by using soil suspension washings, the efficiency of two surfactants (i) a cationic surfactant, the benzyldimethyl dodecylammonium bromide, BDDA, and (ii) a neutral one, the t-octylphenoxypolyethoxy ethanol, triton X-100. The losses of surfactant, by adsorption on soil or precipitation, were measured together with the release of B(a)P, chosen as a model molecule, representative of all the PAHs. The efficiency of surfactants used in blend was then compared to the efficiency of surfactants alone. 相似文献
38.
Rheology of Zirconia Suspensions in a Nonpolar Organic Medium 总被引:3,自引:0,他引:3
Veronique M. B. Moloney David Parris Mohan J. Edirisinghe 《Journal of the American Ceramic Society》1995,78(12):3225-3232
Three dispersants (stearic acid, oleic acid, and poly(12-hydroxystearic acid)) are compared for their ability to produce low-viscosity suspensions of zirconia in kerosene. Rheological measurements and sediment packing density measurements show that poly(12-hydroxystearic acid) is a better dispersant than stearic acid or oleic acid; this is explained in terms of the longer tail of the poly(12-hydroxystearic acid) surfactant molecule. The amount of dispersant can be optimized to reduce viscosity and yield point of the suspension, and to eliminate thixotropic hysteresis. The use of a dispersion medium of lower viscosity than the dispersant makes it easy to detect when complete monolayer coverage has been achieved. The loss of pseudoplasticity, brought about by a higher degree of deflocculation, can be recovered by increasing the volume fraction of solids of a suspension and this is beneficial in the plastic forming of ceramics. Rheological measurements showed that these suspensions reach a "critical state" above a critical shear stress (τc ). This critical state is described by several parameters, i.e., the Bingham yield stress (τb ), the plastic viscosity (νPl ), and the critical shear rate (γc ), which are dependent on the volume fraction of solids. 相似文献
39.
Patard Louis; Stoven Veronique; Gharib Bouchra; Bontems Francois; Lallemand Jean-Yves; De Reggi Max 《Protein engineering, design & selection : PEDS》1996,9(11):949-957
Human lithostathine is a 144-residue protein, expressed in variousorgans and pathologies. Several biological functions have beenproposed for this protein. Among others, inhibition of nucleationand growth of CaCO3 crystals in the pancreas and bacterial aggregationhas retained attention, because lithostathine presents highsequence similarities with calcium-dependent (or C-type) lectins.To study its structure-function relationship and compare itwith that of C-type lectins, we have built a model for lithostathine.This model is derived from the only two C-type lectins of knownstructures: rat mannose binding protein and human E-selectin.An original strategy, inspired by that proposed by Havel andSnow, was designed for model building. We have undertaken NMRstudies on the natural protein. Although complete structuredetermination has not yet been achieved, the NMR studies didconfirm the main characteristics of the model. From analysisof the proposed model, we concluded that lithostathine is notexpected to present sugar- or calcium-binding properties. Therefore,the mechanisms of bacterial aggregation and inhibition of CaCO3nucleation and growth have not yet been elucidated. 相似文献
40.
Veronique Inghelbrecht Bart Steyaert Sabine Wittevrongel Herwig Bruneel 《Telecommunication Systems》2004,27(1):33-45
In this paper, we investigate the evolution of the interarrival and interdeparture times between voice packets when they are proceeding through a number of network nodes. We model the arrival process in a node as the superposition of a single tagged stream and an independent background process that aggregates the remaining traffic sources. Because we assume that the load of a single voice stream is very low compared to the load of the aggregate traffic, we can represent the tagged voice packets as markers (packets with size zero). We will establish an expression for the probability generating function (pgf) of the interdeparture time of the voice packets after one stage and use this interdeparture-time pgf as the pgf of the interarrival time of the voice packets in the next stage, in order to assess the evolution of the interarrival-time characteristics throughout the network. 相似文献