mechanochemical synthesis of ultrafine powders

... microscope Discussion 3.1 Influence of reaction temperature on the morphologies of ZnO powders The influence of the reaction temperature on the morphologies of ZnO powders was studied, and the results ... time 10 h 3.4 XRD patterns of ZnO powders and EDS pattern of flower-like structure The XRD patterns of ZnO of flower-like particles, rods and flake, and the EDS pattern of the ZnO with flower-like ... the morphologies of ZnO powders The influence of the reaction time on the morphologies of ZnO powders was also discussed, as shown in Fig Fig 3(a) and (b) Fig SEM images of ZnO particles synthesized...

Ngày tải lên: 06/05/2014, 13:26

... Synthesis and characterization of nanocrystals of barium titanate, toward a generalized synthesis of oxide nanoparticles J Am Chem Soc 2001, 123:12085-12086 Urban JJ, Yun WS, Gu Q, Park HK: Synthesis ... modeling of aqueous and hydrothermal synthesis of barium titanate (BaTiO3) Chem Mater 2005, 17:5346-5356 doi:10.1186/1556-276X-6-466 Cite this article as: Qi et al.: Direct synthesis of ultrafine ... used as a means of blending, the solubility of barium hydroxide is not a limit during synthesis and thus the synthesis efficiency is improved distinctly For example, a large quantity of solvents...

Ngày tải lên: 21/06/2014, 01:20

... during milling of a ductile39 ductile component system (Ag-Cu) Schematics of microstructure evolution during milling of a ductile-brittle combination of powders This is typical of an 40 oxide ... Amorphization of intermetallics 1982 Disordering of ordered compounds 1983 Amorphization of blended elemental powder mixtures 1987/88 Synthesis of nanocrystalline phases 1989 Occurrence of displacement ... diagram of original mixed powder material samples, including Cu, CuO and Al powder 4.4 The results of X-ray analysis of powder samples after hours milling 4.5 The results of X-ray analysis of powder...

Ngày tải lên: 11/04/2014, 17:14

... leading to the inevitable coarsening of particles and aggregation of the powders, which results in poor microstructures and properties of electroceramics The mechanochemical process, which is also ... electrical properties of the materials Furthermore, the mechanochemical method may produce singlephase materials at lower temperatures and shorten the synthesis time.12–13 Journal of Physical Science, ... Solid solutions of BixNb1Oδ (2.5 ≤ x ≤ 7) were synthesized using a mechanochemical and a conventional solid-state method For the mechanochemical method, the stoichiometric mixtures of Bi2O3 (99.9%...

Ngày tải lên: 07/08/2014, 14:20

... issue of interest is the jamming potential of a bridge A measure of this, in the case of a linear bridge, is its base extension b (see Fig 4.3); this is the horizontal projection of the ‘span’ of ... [21] of an angle of repose [23]; neither would be possible in the presence of Brownian motion In this chapter and the next, we show that the dynamics of bridge formation is a typical result of ... bridge made of n particles therefore always rests on n b = n + base particles For a complex bridge of size n, the number of base particles is reduced (n b < n + 2), because of the presence of loops...

Ngày tải lên: 01/11/2013, 08:20

... referenced Because of the size of the capital investment, the similarity of need, the rate of change in information technology, and the proliferation of vendors, the creation of a public framework ... Investigators responsible for the conduct of the synthesis were Sally D Liff, Manager, Synthesis Studies, and Donna L Vlasak, Senior Program Officer This synthesis was edited by Linda S Mason Valuable ... responsibility and oversight This type of model has led to the emergence of pockets of MIS resources outside of the primary computing environment Lack of training and funding are two critical...

Ngày tải lên: 18/02/2014, 11:20

... Amidation of C-terminus Sulfation of tyrosine Hydroxylation of proline Carboxylation of glutamic acid Cyclization of N-terminal Gln O-Glycosylation Bromination of tryptophan Isomerization of tryptophan ... mechanisms of incorporation of PTMs in the biosynthesis of conopeptides Appropriate methods of analysis need to be addressed to ensure recognition of these PTMs, if present, in the course of characterization ... applications for synthesis of cholecystokinin-12 and bradykinin containing tyrosine sulfate [57], and could perhaps be applicable to synthesis of a-conopeptides Synthesis of variants of a-conotoxins:...

Ngày tải lên: 19/02/2014, 12:20

Ngày tải lên: 19/02/2014, 15:20

... transition of the Eadie– Hofstee plot from the biphasic to a monophasic shape are Table Rates of inactivation of IICBGlc Incubation of purified IICBGlc with the indicated concentration (mM) of the ... consumption of NADH in the presence of L-lactate dehydrogenase, but also formation of NADPH in the presence of Glc6P dehydrogenase This background activity must therefore be due to phosphorylation of ... Reversible inhibition of EIIGlc Eadie–Hofstee plots of nonvectorial phosphorylation of D-Glc (0–2 mM) by membrane fractions containing EIIGlc Phosphorylation was assayed in the presence of inhibitors...

Ngày tải lên: 21/02/2014, 01:21

... methods Relative activity of GpnGs as effectors of the synthesis of poly(A) Based on the above results, the effect of several diguanosine polyphosphates on the synthesis of poly(A) was comparatively ... independent synthesis of poly(A) In order to understand why dinucleoside polyphosphates activated the primer independent synthesis of poly(A), the effect of 0.01 mM Gp4G or Ap4A on the synthesis of poly(A) ... presence of 0.02 mM [a-32P]ATP While confirming the adenylylation of these compounds and the absence of synthesis of poly(A) by the E coli poly(A) polymerase, we did not observed adenylylation of guanosine,...

Ngày tải lên: 21/02/2014, 01:21

... of powders are also discussed It is shown that the hydrolysis of metallic ions is the most important factor leading to the deposition of metal powders from aqueous solutions This new volume of ... volume of metal [5] It is valid at extremely low rcur, being of the order of few millivolts, and it can be neglected except in some special cases, like the stability of the shape of the tips of dendrites ... description of chapters in this volume of Modern Aspects of Electrochemistry ´ Popov and Nikolic in Chapter discuss the fundamental aspects of disperse metals electrodeposition The shapes of polarization...

Ngày tải lên: 21/02/2014, 18:20

... Biogenesis of cytochrome c¢ Heterologous synthesis of PHCP by E coli The E coli System I cytochrome c biogenesis machinery, consisting of the Dsb and Ccm proteins, is responsible for the synthesis of ... database: (2) locus tag of Alvin_2765 of Allochromatium vinosum DSM180; (3) accession number P00138 of Achromobacter xylosoxidans NCIMB11015; (4) locus tag of RSP_0474 of Rhodobacter sphaeroides 2.4.1 ... in the absence of pEC86 not confer the cytochrome c biogenesis ability to the PH c552 protein This is possibly a result of the shortage of Ccm proteins, because the expression of ccm genes is...

Ngày tải lên: 06/03/2014, 00:20

... COM/ENV/TD(2004)10/FINAL Table Membership of key MEAs and dates of ratification, acceptance, approval or accession Vienna Convention for the Protection of the Ozone Layer Country Date of signature of MEA Montreal Protocol ... Services In Nicaragua, the Ministry of Environment and Natural Resources (MARENA) has an Office of Environmental Services that is in charge of identifying the benefits of trade in environmental goods ... determinants of demand, such as: the state of the economy; population and population growth; the state of the environment; and pressure from stakeholders, civil society and consumers in each of the...

Ngày tải lên: 07/03/2014, 08:20

... characterization of l-gulonolactone oxidase from chicken kidney microsomes Biochemistry 21, 5076– 5082 14 Loewus FA (1999) Biosynthesis and metabolism of ascorbic acid in plants and of analogs of ascorbic ... ⁄ PAGE revealed the presence of one protein band of about 70 kDa (Fig 1, lane 2) The identity of the protein was confirmed by enterokinase treatment After digestion of the affinity-purified GSTtagged ... Characterization of the recombinant dehydrogenase of M tuberculosis L-gulono-1,4-lactone Fig Heterologous expression and purification of the recombinant L-gulono-1,4-lactone dehydrogenase (Rv1771) of M tuberculosis...

Ngày tải lên: 07/03/2014, 12:20

... production of UDP-GlcA and UDP-Xyl via conversion of a large precursor pool of UDP-Glc into the derivative molecules Here, we report the generation of yeast strains capable of producing large amounts of ... maintains the pool of UDPGlc of the cell in cooperation with AtUXS3 via inhibition of UDP-Xyl by AtUGD1 in vivo Table Quantification of UDP-sugar levels in yeast The amounts of UDP-glucose, UDP-glucuronic ... constructs were integrated into the leu2 locus of chromosome III of S cerevisiae strain W303a to yield the strain TOY1, and into the trp1 locus of chromosome IV of S cerevisiae strain W303a to yield the...

Ngày tải lên: 07/03/2014, 12:20

... epistasy of synthesis (CES) process [1], D1 and apoCP47 display concerted rates of synthesis In the absence of D1, the rate of synthesis of apoCP47 is strongly reduced, while the rates of synthesis of ... degradation or to their lower rate of synthesis When we studied the rates of synthesis of the individual PSII subunits by pulse-labelling experiments, we observed that synthesis of D1 and apoCP47 were barely ... mf1 and mf2 is due to a decreased synthesis of two PSII core subunits The strongly reduced accumulation of PSII could result from a defect in the synthesis of any of the major PSII core subunits...

Ngày tải lên: 07/03/2014, 15:20

... 2005) are examples of such attempts The present work also uses the concept of complex networks to develop a platform for a holistic analysis as well as synthesis of the distribution of the consonants ... studies of PlaNet In section we provide a simplified theoretical explanation of the analytical results ob- Figure 1: Illustration of the nodes and edges of PlaNet tained In section we present a synthesis ... Degree distribution of PlaNet for the set VL The figure in the inner box is a magnified version of a portion of the original figure Degree Distribution of PlaNet The degree of a node u, denoted...

Ngày tải lên: 08/03/2014, 02:21

... ampicillin Values of 47 ± mM for KNapp and of 3.6 ± 0.22 for (Vs/Vh)max for the synthesis of ampicillin were obtained from fitting Eqn (8) to the data For synthesis of penicillin G, a value of 0.018 mM)1 ... reactive ester of NIPGB in kinetic experiments, failed because of the high rates of spontaneous hydrolysis of this compound The only substrate of PA for which the steady-state rate of hydrolysis ... analysis of penicillin acylase (Eur J Biochem 270) 3681 Fig Inhibition of NIPGB hydrolysis by 7-ADCA Lineweaver–Burk plot of the effect of various concentrations of 7-ADCA on the conversion of NIPGB...

Ngày tải lên: 08/03/2014, 08:20

... (8) (10) 61 Another method of logic synthesis of Obviously now the value of set E shows the complete parameters of periodical as well as frequency existence of forms of circuit functions (from ... 3) 59 Another method of logic synthesis of Table Circuit function with input state R3, of RS - FF - Counter with k = 6, = to 64, in which: P is the periodical existence of circuit function form ... same form Figure describes the appearance of form and form on axis Figure 3: Description of form and form on axis 57 Another method of logic synthesis of From figure we can see that if = 2,...

Ngày tải lên: 14/03/2014, 13:20

... produced by pyrolysis of mixture of Si and SiO powders Recently, Pan et al [8] have developed a molten gallium-catalyzed vapor–liquid– solid (VLS) process for the growth of bundles of highly aligned ... production of large-quantities of high-purity (no metal catalysis contamination) and ultralong (millimeters) SiO2 nanowires (most of the wires have uniform diameters of $50 nm, while some of them ... in the spectral range of 300–800 nm using a He–Cd laser with a wavelength of 325 nm as the excitation source Results and discussion After the synthesis, a large quantity of white wool-like product...

Ngày tải lên: 16/03/2014, 15:03