[en] In this paper, we proposed to study the phase transition process to use the new pair of variables, the temperature T and the cumulative number n_c(T,n_c), instead of (T,ρ) or (T,μ) which is mainly used in theoretical calculations. We considered the transverse energy spectra of protons and π^--mesons produced in π^-C-interactions at 40 GeV/c as a function of cumulative number n_c (or four dimensional momentum transfer t) and the baryonic chemicalpotential μ_b(√t). Obtained results indicate the possible appearance of QCD phase transition of nuclear matter. (author)

[en] Surface-plasmon resonance (SPR) effect in thin metal films is highly sensitive to the dielectric refractive index changes in the The Kerr-lens mode-locking (KLM) is known as a suitable method for generation of femtosecond pulses and mode-locked Ti:sapphire laser is now widely used sources of stable, energetic femtosecond pulses. We will present the simulation of KLM in Ti:sapphire laser cavities with a folded-cavity four-mirror by applying the ABCD ray-tracing technique for a Gaussian beam. Simulations will be performed for an asymmetric resonator design. Based on the numerical analysis, we will find the optimum design parameters (slit position, gain cavity spacing, gain medium position) for KLM.

[en] In 2014, a wavelength dispersive X-ray fluorescence spectrometer AR-31-M for industrial technological control was installed in the X-Ray laboratory, Erdenet Mining Corporation which is one of the biggest mining industries in Asia. In this workestimation of registration equation based on pulp density by the XRF spectrometer, is presented.

[en] In this work, a LabVIEW system was developed to measure the capacity and internal resistance of rechargeable batteries. In doing so, the capacity and internal resistance of Panasonic factory AA-size Eneloop batteries were automatically measured using an electronic load (DL3021), a programmable power source (DL3021), a DAQ NI-9219, and a thermocouple.

[en] In this work the 3 ore body drill core samples. 6 host rock samples from the main ore body of the Mushugay Khudug REE deposit in southern Mongolia were selected as most representative samples and studied by XRD and ICP-MS. LA-ICP-MS method to evaluate elemental and structural composition data of the deposit. According to our determinations the main orebody of the Mushugay Khuduk deposit contain up to 130 kg/ton of REEs. Despite the moderate total mineable reserve the main ore body of the Mushugay Khuduk deposit might compete economically with world's biggest REE mining deposits such as Bayan-Obo (Inner Mongolia. China) or Mountain Pass (California. USA) if consider the deposit's higher REE grade and easier to mine local geological condition. The important advantage of the Mushugay Khuduk deposit is that the relative contents of most valuable HREEs Eu. Tb. Dy. and Lu are significantly higher than that of Mountain Pass or Rayan-Obo. The relative net content of these four elements is 0.1 percent for Mountain Pass and 0.4 percent for Bayan-Obo. while the ore samples of the Mushugay Khuduk deposit has 0.75 percent according to our determinations.

[en] We aim to estimate solar resource of Mongolia using satellite data in combination with limited ground measurements. Visible channel images provided by Japanese Geostationary Meteorological Satellite (GMS) Himawari 8 are correlated with ground-based measurements of solar irradiation to derive parameters of the semi-physical model.

[en] Pump-probe experimental setup using 10 fs ultra-short laser pulse was successfully developed. Using this setup, the excitation of coherent phonons in Te and GaAs were measured for calibration and accuracy test of the developed setup. Coherent Raman-active phonons are observed by PP experiments. 10 fs pulse was not necessary to generate coherent optical phonon. Strongly chirped pulse with roughly » 20 fs duration can generate it. Frequencies of these modes was in good agreement to values reported. It was demonstrated how spectrum of laser near of band-gap could signicantly aect the pump-probe signal. In near of band-gap, the PP response of GaAs is dependent on the spectrum of the laser, but coherent optic phonon oscillation isn't dependent on it. Time-and-frequency resolved pump-probe optical spectroscopy is used to investigate the eect of spectral dependence of pump-probe of GaAs. The measured modications of the optical properties of GaAs are consistent with the creation of a non-thermal state, metastable on the ps timescale, after the pump-induced impulsive modication of the electron interactions.

[en] The conventional XRF analysis is wide used and suitable analytical method for various fields, especially environmental studies. Air pollution associated with atmospheric particulate matter (PM) is a serious problem in Ulaanbaatar city, the capital of Mongolia. According to World Bank estimation Ulaanbaatar is one of most polluted city. In this paper, we have done XRF analysis on Air Particulate Matters for determining to identification sources and its contributions which was the first time in Mongolia. Main pollution sources for PM2.5 particles of Ulaanbaatar by the result of XRF analysis are soil, combustion and vehicles.

[en] In this study, the structure and optical properties of perovskite-structured lanthanum ferrite (LaFeO₃) were determined by UV-vis spectroscopy, and the electrochemical properties were determined by cyclic voltammetry. As a result, the crystallite size of the LaFeO₃ compound was D = 38.9 nm, the unit cell volume was V = 241.871, the crystal structure had an orthorhombic Pnma space group, and the forbidden band width was E_g = 2.26 eV from the results of UV spectrometry. As a result of cyclic voltammetry measurements, the capacitance was calculated as C_s = 1.96 F/g.

[en] We explore the profiles of the flux tube connecting a quark and an antiquark in high temperature SU(3) lattice gauge theory in close vicinity to the critical temperature of the phase transition. In this work, we consider the more realistic case of the flux tube with dynamical quarks, extending the previous study to SU(3) gauge group and making use of the Gradient flow method in smoothing procedure for noise reduction. The profiles of the chromoelectric and chromomagnetic field strengths in the flux tube have been measured from Polyakov loop-plaquette correlations using the highly improved staggered quark (HISQ) action on a lattice with temporal extent 𝑁𝜏=8. We present preliminary results for distances up to 2.5fm and temperatures up to1.09𝑇_𝑐.