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... combination of iris and electronic amplification (gain) Manual aperture control can be handy when your subject is standing against a bright background The camera automatically reads the scene as ... a television station The image and sound quality of a DV camcorder is better than broadcast television as viewed on an average TV The transitions and special effects, available with any low-cost ... Production In general, the main differences between standard and high grades of analog camcorders are image and audio quality High grade formats noticeably increase image resolution and audio fidelity...

Ngày tải lên: 01/06/2014, 11:26

... Information Systems), is a textual database management system designed to build and manage textual databases Database management systems - Textual databases and cds/isis basics – page What does CDS/ISIS ... unstructured texts, and for textual data in non-Latin scripts (or languages with specific usage of accented characters) Database management systems - Textual databases and cds/isis basics – page 13 Exercises ... textual database management Click on your answer Database management systems - Textual databases and cds/isis basics – page 14 Exercise What is the function of the Field Definition Table? It is a...

Ngày tải lên: 31/03/2014, 20:20

... [23–25] As a result, the nanobelt’s width increases gradually along the axial direction starting from the contact region between liquid Au nanoparticle and CdS, i.e., the tapered CdS nanobelts ... of a quartz tube, which was inserted into a horizontal tube furnace The silicon wafer coated with *2 nm Au film was perpendicularly placed on the other ceramic boat located downstream, 10 cm away ... emission, because the peak position is very near the band gap of CdS (2.47 eV) at room temperature [26, 27] The relatively narrow fwhm and absence of defect-related emission demonstrate that the tapered...

Ngày tải lên: 22/06/2014, 00:20

... electronic transport properties and the nonlinear I–V characteristics in quasi-1D materials in accordance with 123 Fig a Typical TEM image of polyaniline nanotubes and b the corresponding I–V characteristics ... polypyrrole case h has smaller values indicating a higher exponential increase in G with increasing temperature (h = 0.1052 at T = 200 K) The voltage scale parameter V0 also varies in a small range from ... delocalized and free conduction electrons compared to atomic dimension in disordered materials transfer across the insulating gaps in the conducting pathways [13] In terms of Kaiser expression, considering...

Ngày tải lên: 22/06/2014, 01:20

... results we can associate the transitions |1i and |2i to carrier recombination from ± 1U and ± 1L states and the transition |3i to a surface states emission By analysing the temperature dependence ... intensities fall abruptly due to activation of nonradiative processes involving all the states, such as thermal escape induced by optical phonons absorption To explain the behaviour up to 60 K, we have ... lifetimes and A1 , A2 , A3 are the weights of each process, respectively At low temperature (15 K) the parameter values (obtained by analysing all the emission wavelengths) for the two samples are shown...

Ngày tải lên: 22/06/2014, 18:20

... button now says Append That's your clue that Disk Utility understands what it's about to do: add information to an existing CD, resulting in a second disk icon on the desktop containing only ... only the new material You've just created a multisession disc! You can repeat the process over and over again, adding more and more material to a disc—or at least until it's just about full ... disc's icon appear on the desktop after a moment; its icon also appears in the Sidebar, complete with a round Burn symbol that looks like a radioactivity logo At this point, you can begin dragging...

Ngày tải lên: 14/12/2013, 10:15

... US$-denominated contracts, variation in the Euro-US$ rate may also influence the variation in CDS spreads In particular, higher uncertainty about future variation of the Euro-US$ rate may also have an ... state aid measures In contrast, for Greece, Ireland, Italy, Portugal and Spain which on average have lower bases, the interaction dummy indicates an overall negative impact of the amount of bonds ... prices now consisting of an upfront payment and a regular fixed coupon (cf Barclays 201 0a) This change in their contractual features has made trading and closing out of positions easier Putting...

Ngày tải lên: 16/02/2014, 02:20

...  a   a  * y (1) where E g (a) is the effective band gap of QDs with radius of a, the band gap E g, Bohr exciton radius aB and Bohr exciton energy R * are the specific parameters of bulk material ... material From absorption y spectra, we can determine the E g (a) of QDs, hence can estimate the mean size of QDs From this formula, the standard curve and measured absorption spectra, we can estimate ... X-ray diffraction o wavelength (with radiation CuKα: λ = 1,5406 A ); θ : the diffractional angle and k- constant (k = 0,9) The structure and morphologies of the CdSe nanoparticles were characterized...

Ngày tải lên: 14/03/2014, 13:20

... use as an additional explanatory variable the amount of sovereign debt purchased by the ECB in the secondary market from May 2010 onwards This information is available only on a weekly basis, and ... Netherlands, Austria, and Belgium, while the CDS market is playing a major role in Italy, Ireland, Spain, Greece, and Portugal Palladini and Portes (2011) use data on six euro-area countries (Austria, ... Rocha da Farias, Francisco Rodríguez-Fernández, Gerald Dwyer, Richard Braun, Dante Amengual, Stefano Puddu, and seminar participants at CNMV; VI Seminar on Risk, Financial Stability, and Banking...

Ngày tải lên: 15/03/2014, 07:20

... of Abstraction As explained above, a master document is a specification of all the information that might be included in a brochure on a particular topic, along with annotations indicating what ... L., and Wilkinson, J (1995) HealthDoc: Customizing patient information and health education by medical condition and personal characteristics Workshop on Artificial Intelligence in Patient Education, ... descendant of Penman, to generate an appropriate surface form in English A formatter then lays out the text attractively and adds headings and illustrations for final printing Authoring and Generating...

Ngày tải lên: 22/03/2014, 15:21

... hot-exciton intraband relaxation for both QRs and QDs We have also shown the phonon relaxation channel is comprised of both transverse and longitudinal acoustic phonons for films, which is contrary ... the same 1S(e)-1S3/2(h) transition rather than the same diameter An additional outcome of the TA measurement was excitation of phonons at particular probe wavelengths From Fig 2 (a) and 3 (a) , the ... Electrons can relax via Auger – relaxation, non-adiabatic (i.e by means of exciton-phonon interaction), and through exterior transfer (e.g through surface ligands) The holes relax primarily through...

Ngày tải lên: 06/05/2014, 08:53

... of scale, each colloidal sample had an absorbance at the 1S transitions of roughly 30 mOD, whereas the thin-film samples had a 10−20 mOD absorbance at the 1S transition Intraband Relaxation Studies ... NCs and the reduction in surface ligands from the hydrazine treatment samples on intraband relaxation is less significant For both QDs and QRs, the thin-film samples exhibit intraband relaxation ... Nonadiabatic Relaxation In addition to the charge carrier aspects of the TA measurements, we can also extract the superimposed nonadiabatic relaxation, that is, the coherent lattice vibrations...

Ngày tải lên: 06/05/2014, 08:55

... of scale, each colloidal sample had an absorbance at the 1S transitions of roughly 30 mOD, whereas the thin-film samples had a 10−20 mOD absorbance at the 1S transition Intraband Relaxation Studies ... NCs and the reduction in surface ligands from the hydrazine treatment samples on intraband relaxation is less significant For both QDs and QRs, the thin-film samples exhibit intraband relaxation ... Nonadiabatic Relaxation In addition to the charge carrier aspects of the TA measurements, we can also extract the superimposed nonadiabatic relaxation, that is, the coherent lattice vibrations...

Ngày tải lên: 06/05/2014, 08:58

... between the particle size and its resultant bandgap, based on the material being used and its bandgap in the bulk form (Equation 1).9 In the equation, EgQD is the theoretical bandgap of the quantum ... N2 gas prior to and during reactions to prevent oxidation, and the vessels were sealed with rubber septa Heating was achieved using a heating mantle connected to a variac (variable autotransformer) ... of a particle are smaller than the exciton Bohr radius (Figure 13) Figure 13: A quantum dot exhibits bandgap tunability because it is smaller than the spatial separation between the electron and...

Ngày tải lên: 15/05/2014, 10:25

... http://www.nanoscalereslett.com/content/6/1/398 Page of use the following formula to calculate the band gap energy of CdSe αhv = A( hv − Eg )1/2 (a) where a, v, Eg, and A are the absorption coefficient, light frequency, band gap, and a constant, ... photocatalyzed by the CNT-CdSe composite decreased as the original MB concentration increased The main reason is that the initial dye concentration may affect strongly the rate of the photocatalytic ... Murali KR, Swaminathan V, Trivedi DC: Characteristics of nanocrystalline CdSe films Sol Energy Mater Sol Cells 2004, 81:113-118 Patil KR, Paranjape DV, Sathaye SD, Mitra A, Padalkar SR, Mandale...

Ngày tải lên: 21/06/2014, 03:20

... for 24 h at 37°C as measured by an MTT assay The error bars show the standard deviations the average cell viability of four tests, while the error bars show the standard deviations Satisfactory ... A water-soluble and biocompatible polymer with carboxylic functional groups, PAA, is selected as a capping ligand for controlling the crystal quality of QDs such as size, size distribution, and ... labeling and washing, 20 μL of a solution of MTT (5 mg/mL in PBS) was added to each well, and assay was performed at specific time intervals The absorbance of the formazen product was then measured at...

Ngày tải lên: 21/06/2014, 08:20

... CdS nanotube arrays are measured using a two-parallel-plate configuration in a homemade vacuum chamber at a base pressure of *1.0 10-6 Pa at room temperature The sample is attached to one of stainlesssteel ... our case, l/r of those CdS nanotube arrays are 123 A large area of CdS nanotube arrays is fabricated by a facile way of layer-by-layer deposition The wall thicknesses of nanotubes are controlled ... the value of Eto and Eth decrease and b increases The thinnest walls of CdS nanotubes exhibit the least value of Eto and Eth for promising candidate materials on field emitters and nanodevices Acknowledgments...

Ngày tải lên: 22/06/2014, 00:20

... interfaces [26–29] The aggregation of nanoparticles contains the linear alignment which can be achieved by sharing a common crystallographic orientation among the primary particles and the nonlinear ... arrangement particles A1 , A2 , A3 , and two oriented attachment branches A4 and A5 Figure 5d, the magnification of section A in Fig 5c, displays them clearly Thereinto, the branches A4 and A5 display the ... highresolution TEM image of a tribulus-shaped nanoparticle; d magnification of the section A in (c) exhibiting three random arrangement particles A1 , A2 , A3 and two oriented attachment branches A4 (\11-20[...

Ngày tải lên: 22/06/2014, 01:20

... determination of the concentration of the pollutants as the initial concentration C0 The remaining concentration of pollutants in the suspension at given intervals of irradiation was measured on a ... Nanoscale Res Lett (2009) 4:558–564 [29–32] ZnS has a wider band gap (Eg = 3.7 eV) than CdS The surface modification of a wide band gap semiconducting shell around a narrow band gap core can alter ... hexagonal CdS along the ½2 1Š zone axis and diffraction rings as that of the ZnS layer with polycrystalline nature (Fig 3f) The measured lattice spacing based on the rings in the diffraction pattern...

Ngày tải lên: 22/06/2014, 01:20

... nonlinear scattering and nonlinear absorption Optical limiters based on nonlinear absorption mechanisms like free carrier absorption and multiphoton absorption are very efficient Open z-scan studies ... than the fundamental absorption edge 2.69 eV, the experimental data are analysed using a model incorporating saturable absorption followed by two photon absorption (2PA) We consider a nonlinear ... (circles) along with Gaussian fit (solid line) Deconvoluted peaks corresponding to excitonic transitions (dashed lines) material parameters such as effective mass and bandgap as numerical inputs...

Ngày tải lên: 22/06/2014, 18:20