Attosecond Interferometry Using a HHG-2 Scheme

"We present an interferometric HHG-2 scheme and compare it to the usual XUV-IR RABBIT method that is widely used in attosecond science. Both methods are able to reconstruct the properties of an attosecond pulse train and can be used to measure attosecond ionization time delays in atoms and molecules. While they have several similarities, they also have conceptual differences. Here, we present some particularities of the HHG-2 method and its advantages and drawbacks, which would help to define situations where it can provide information inaccessible by other technics. Keywords: Attosecond, Photoionization, RABBIT "

Tunneling Ionization Study of Linear Molecules in Strong-Field Laser Pulses

"We theoretically studied photoionization of atoms and molecules in the frame of Perelomov-Popov-Terent’ev (PPT) and Ammosov-Delone-Krainov (ADK) theories. Strong-field single ionization of two diatomic molecules, N_2 and O_2, are studied and compared to Ar and Xe atoms, using an 800 nm Ti:sapphire laser in the 3×〖10〗^13 to 1×〖10〗^15 Wcm^(-2) intensity range. To eliminate disagreement between theoretical and experimental findings in a low intensity fields (~6×〖10〗^13 Wcm^(-2)), we considered the influence of shifted ionization potential. Including these effects in the ionization rates, we numerically solved rate equations in order to determine an expression for the ionization yields. The use of modified ionization potential showed that the ionization yields will actually decrease below values predicted by original (uncorrected) formulas. This paper will discuss the causes of this discrepancy. Keywords: tunneling ionization, ionization rate, ionization yield, molecules. "

Cross-Correlations in the Brownian Motion of Colloidal Nanoparticles

"The two-body cross-correlation for the diffusive motion of colloidal nano-spheres is experimentally investigated. Polystyrene nano-spheres were used in a very low concentration suspension in order to minimize the three- or more body collective effects. Beside the generally used longitudinal and transverse component correlations we investigate also the Pearson correlation in the magnitude of the displacements. In agreement with previous studies we find that the longitudinal and transverse component correlations decay as a function of the inter-particle distance following a power-law trend with an exponent around -2. The Pearson correlation in the magnitude of the displacements decay also as a power-law with an exponent around -1. Keywords: colloidal particles, Brownian motion, cross-correlation. "

Investigation of Possible Uniaxial Anisotropy in Co11Zr2 Magnetic Phase

"The Co11Zr2 magnetic phase was obtained by a combination of melting, mechanical milling and high temperature annealing. The structure and magnetic properties of the obtained material were investigated. Even though the samples possessed low coercivity, it was shown that they possess uniaxial anisotropy. Keywords: hard magnetic materials, magnetic anisotropy, mechanical milling, high temperature annealing "

P2P (Bilateral) Communication Between Nodemcu Esp8266 Boards Using Arduino Ide

"Bilateral communication between the boards NodeMcu ESP826 is achieved using the WI FI capabilities of these devices and particularly code based on Arduino IDE. The system is used to control servos, DC motors or led. The duplex communication allows feedback action between sender and receiver. Real time feedback is obtained by particularly connection of the servo to the board. Keywords: Bilateral communication, NodeMcu ESP8266, Arduino. "

Epr Testing of Organic Versus Conventional Musaceae Fruits

"In the present study, the EPR spectroscopy was used to evidence differences in fruits of organically and conventionally grown bananas belonging to musaceae family. If in the investigated samples would be detected specific changes related to paramagnetic resonant centers, these could be regarded as a spectroscopic fingerprint in the differentiation of the organic and conventional fruits and vegetables. The EPR spectra were recorded from freeze-dried shell and pulp samples. The main paramagnetic species (iron, manganese and native semiquinone free radical) delivered for the investigated samples slight different EPR signals. In this stage, the results obtained by EPR testing put in evidence sensible differences between the two classes of samples, and draw the attention on differences in EPR signals recorded from banana pulp and shell. Keywords: EPR spectroscopy; organic food; conventional food."

Resistance of High-Tc Superconductors: Review Article

"The origin of resistance and its relation to the superconducting mechanism remain a profound, unsolved mystery. Currently, model parameters used to fit normal state properties are specific and vary arbitrarily from one doping. This short review illustrates the electrical resistivity of ceramic high temperature superconductors copper oxides. The article gives a summary of the prevailing arguments of researchers to relate the material to ceramic HTS compounds. Keywords: superconductivity, HTC ceramic compounds, resistivity. "

Positron impact ionization of alkali atoms

"The models CPE and CPE4, which were successfully used in positron impact ionization studies, are applied to positron impact ionization of Li, Na and K. This work produces total cross sections which are in agreement with the existing theoretical papers and shows the necessity for experimental measurements of these processes. Keywords: Positron collisions; Ionization of Atoms "

Synthesis and Preliminary Characterization of Modified 45s5 Bioglasses

"The study is devoted to synthesis and preliminary structural and morphological characterization of modified 45S5 glasses, in (66-x)SiO2∙27CaO∙4P2O5∙3TiO2∙xAl2O3 system, with potential applications in dentistry. The composition of the sol-gel derived samples was verified with respect to their nominal composition. The effect of partial SiO2 replacement with Al2O3 on samples structure and morphology is investigated. It was established that the Ca/P ratio is diminished in Al2O3 containing samples and that an amorphous hydroxyapatite phase similar to hydroxyapatite reported for bone tissue is formed. Keywords: bioglasses; sol-gel-synthesis; XRD; SEM; EDX. "