sample science lesson on the properties of solids

... early as 1934 that the application of ultrasonic energy could increase the rate of electrolytic water cleavage The effects of ultrasonic radiation on chemical reactions are due to the very high temperatures ... that of Pt4+/Pt (0.742 V [18]) Table1.Chemical composition, magnetic properties of the samples J is the current density; ton is the deposition time of a pulse; Fe, Pt are the atomic percent of ... [21] The broad peak on the DSC trace in the FePt nanoparticles suggests that there was no such transition in the FePt nanoparticles upon annealing The formation of the L10 FePt phase was N.H Luong...

Ngày tải lên: 13/02/2014, 03:20

... during the course of preparation cannot be excluded, but that still leaves unanswered the question of how the addition of micromolar concentrations of NADPH suffice to drive the conversion of PORPChlide635 ... isolate the contribution of the pH-driven conformational changes from the other effects, a parallel study was carried out on the low-pH induced blue shift in the PChlide absorption maximum of nonphotoconverted ... seen, if the measurements on the photoconverted enzyme were made in the absence of excess NADPH Under these conditions, the absorption maximum of the freshly photoconverted Chlide shows the usual...

Ngày tải lên: 22/02/2014, 04:20

... wheel, the longer path The increasing speed of the wheel make the thickness of ribbons thinner and the ratio between the area and volume of the ribbons that contact with the surface of the wheel ... plot of sample v = 30 m/s, the first peak (a) and the second peak (b) Tab The thickness, t, the crystallization activation energies, Ea1 and Ea2, and the crystallization volume fraction, Xf, of the ... corresponds to the crystallization of α-Fe(Si) phase and the second one is related to the forming of boride phase (Fig 2) When increasing cooling rate, the first peak (Tp1) and the second one (Tp2)...

Ngày tải lên: 05/03/2014, 14:20

... discussion The mechanism of formation of particles was understood as a short single burst of nucleation occurred when the concentration of constituent species reached critical supersaturation Then, the ... diffusion of solutes from the solution or/and aggregation of other nuclei to their surface until the final size was attained In conventional coprecipitation, size (d) can be controlled by concentration ... indicated that the particles have the invert spinel crystalline structure as in the bulk phase The width of peaks of the sample with higher concentration was broader than that of the peaks of sample...

Ngày tải lên: 28/03/2014, 10:20

... than the change of n values The differences of n values in UV or IR range may be due to the variation of dielectric functions of the films depending upon the deposition parameters The change of ... increased The samples were deposited at kW without additional oxygen The electrical properties of the samples were shown in Fig 5c The k values of the samples showed more change by varying deposition ... additional oxygen gas The deposition power was kW The optical constants of the samples were not measured, but higher electron concentration may result in higher extinction coefficient and adsorption...

Ngày tải lên: 24/05/2014, 13:53

... interaction The other type of excitations can be derived using the random phase approximation, corresponding to summation of “bubble” diagrams These excitations, called magnetoplasmons, are analog of ... elementary excitations in the system are caused by electron transitions from one of the filled Landau levels to one of the empty levels [14] Such transitions can be observed in cyclotron resonance or Raman ... eigenvalues of the full Hamiltonian of relative motion ′ H ′ = H0 + V ′ in the basis of the bare magnetoexcitonic states (11) As discussed in the Introduction, a relative strength of the Coulomb...

Ngày tải lên: 22/06/2014, 00:20

... Correlation of the dipole moment µ with the Hammett σ constants of the substituents It is evident from the table II that electron-donating substituents on the phenyl ring increase the pKa of aniline’s ... Also, the pKa of the amino nitrogen is increased by electron-donating substituents The variations of the three properties are closely tied together Hammett σ constants which used as regression indicator ... Fugure Correlation of QN with the Hammett σ constants of the substituents According to the table 2, electron-donating substituents decrease the dipole moment of compounds and electron-withdrawing...

Ngày tải lên: 23/07/2014, 13:21

Ngày tải lên: 05/08/2014, 10:20

... present the chemical composition of the organic and inorganic components of the waste paper The addition of fillers, which serve to reinforce the foam, significantly increased the value of the compressive ... Figure 3: The effect of filler content on the hardness of PS foam produced with and without a TEDA catalyst CONCLUSION The effect of TEDA as a catalyst and waste paper filler content on the mechanical ... the aid of the peak pointer of the durometer, which indicates the maximum indentation reading during the measuring period RESULTS AND DISCUSSION TEDA was used as the catalyst in the production...

Ngày tải lên: 07/08/2014, 14:20

... present thesis was based on the last of the above mentioned techniques to improve the DSSC, i.e to improve the photon-electron conversion in the visible region, in particular by the incorporation of ... conventional silicon solar cell, the excited electron is successfully separated from the hole by a p-n junction The junction region is depleted of both electrons (on one side) and holes (on the ... discussion in the previous chapters, the conclusions focus on the explanation of photocurrent damping seen for Au/TiO2 composite films in the UV region and on the role of Au particles in the photon-electron...

Ngày tải lên: 10/09/2015, 15:47

... Investigate the effect of magnesium addition on the incorporation of Al2O3 and properties of Al/Al2O3 composite (d) Phase IV – Investigate the effect of reinforcement size on the resultant properties of ... Investigate the effect of extrusion temperature on the microstructure and properties of pure Al (b) Phase II – Investigate the effect of extrusion ratio on the microstructure and properties of pure ... particles together These organic binders often leave residual contamination that causes deterioration of the mechanical properties of the composite The other disadvantages are the: (a) inherent...

Ngày tải lên: 05/10/2015, 19:04

... Journal of Science: Mathematics – Physics, Vol 31, No (2015) 15-20 Experimental The synthesis of FePt nanoparticles was conducted by sonochemical reaction The mixture of H2PtCl6 and iron (II) ... VNU Journal of Science: Mathematics – Physics, Vol 31, No (2015) 15-20 Effect of Heat Treatment Conditions on the Properties of FePt Nanoparticles Produced by Sonochemistry Truong Thanh Trung1, ... Oe The low value of Ms of the as-prepared nanoparticles may be explained by the oxidation or hydroxidation of Fe atoms in nanoparticles which can result in the weak magnetic iron oxides and iron...

Ngày tải lên: 19/02/2017, 18:54

... Journal of Science: Mathematics – Physics, Vol 31, No (2015) 15-20 Experimental The synthesis of FePt nanoparticles was conducted by sonochemical reaction The mixture of H2PtCl6 and iron (II) ... Oe The low value of Ms of the as-prepared nanoparticles may be explained by the oxidation or hydroxidation of Fe atoms in nanoparticles which can result in the weak magnetic iron oxides and iron ... as-prepared sample Particles size of the as-prepared Fe60Pt40 sample was 3-5 nm Figure TEM image of the as-prepared Fe60Pt40 nanoparticles Figure shows the X-ray diffraction (XRD) pattern of the as-prepared...

Ngày tải lên: 12/12/2017, 12:43

... O-C bonds [13, 15] The appearance of siloxane bonds was indicative of a polysiloxane depositing on the filler, whereas the alkoxysilane bonds seemed to confirm the occurrence of a condensation ... study mainly focused on the influence of filler treatment on the properties of rHDPE/NR/KP biocomposites Figure depicts the effect of silane treatments on the tensile strength of the composites APTES ... of KP was mixed with 95 mg of potassium bromide and pressed to form pellets FTIR was performed on the pellets to obtain the information on the chemical modification of KP Tensile Properties The...

Ngày tải lên: 16/12/2017, 03:49

... the variation of crystallinity with respect to the position in the sample, we have taken X-ray diffraction patterns at depths of d ¼ 0:2 and 0.4 mm beneath the surface of the samples The results ... rotation of domain moments From Fig and from the thermomagnetic measurements at low field we derived the composition dependence of the magnetic characteristics of the samples as presented in Table One ... compositions The DSC curves of all samples have been determined The samples with lower Ti content show an exothermic peak associated with crystallization With increasing Ti concentration the crystallization...

Ngày tải lên: 16/12/2017, 08:57

... (1) contribute to the hard-magnetic properties of the studied ferrites Measurements of the electrical properties of the samples show that the decrease of the specific resistance in the doped sample ... 4f1, 4f2 positions This leads to an increase of the total magnetization This conclusion agrees with results from the temperature dependence of the saturation magnetization of these samples Fig As ... 8501C there is a thermal decomposition of SrCO3 and BaCO3 In this temperature region, the ferritization reaction is strongly enhanced Moreover, the temperature at which the ferritization reaction...

Ngày tải lên: 16/12/2017, 11:51

... development and the conclusion The very first part, the introduction, covers the background information such as rationale, aims, scope, and design of the study The second part, the main part, of the study ... for the two research questions, each question of both types of the survey questionnaires is intended to make a clear facet of the research questions Therefore, the survey questionnaire for the ... consult from their supervisors, the content of the subject matters drew the greatest attention of all the teachers, and teaching methods occupied the second rank with the approval of among 10 surveyed...

Ngày tải lên: 29/01/2014, 10:49

... integrals to derive the symmetric properties of the q-Bernoulli polynomials By using the symmetric properties of p-adic integral on X, we can easily derive many interesting symmetric properties related ... Equations Acknowledgments The authors express Their sincere gratitude to referees for their valuable suggestions and comments This work has been conducted by the Research Grant of Kwangwoon University ... Kurt, “Further remarks on multiple p-adic q-L-function of two variables,” Advanced Studies in Contemporary Mathematics, vol 14, no 1, pp 49–68, 2007 L.-C Jang, On a q-analogue of the p-adic...

Ngày tải lên: 21/06/2014, 16:20

... effect on the contact angle value Explanations of the limited effect of extractives on the ASE and θa values is probably due to the difficulty to remove these latter one from solid wood as demonstrated ... quantify these latter, namely the direct method based on the weight of the extracts after evaporation of the solvent and the indirect method based on the mass loss of sawdust, give very near results ... the diameter of the colony estimated from the mean of two perpendicular diameters and expressed as a percentage of the room available for growth, i.e the diameter of the dish Growth inhibition...

Ngày tải lên: 08/08/2014, 01:22

... vertices, which is the main result of the paper The organization of the paper is as follows In the rest of this section we introduce basic notations In Section 2, we verify the conjecture for all ... partitioned into at most c subsets so that each of the subsets is either a clique or an independent set, and between any two of them there are either all possible edges or none of them The factorial ... 0, and the index of the class of all graphs equals infinity With this extension, the family of all hereditary classes is partitioned into countable number of subsets each of which consists of classes...

Ngày tải lên: 08/08/2014, 14:23