Počet nalezených dokumentů: 442
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Instrumentální neutronová aktivační analýza omamných a psychotropních látek, zejména heroinu, kokainu, metamfetaminu a možných adulterantů
Kameník, Jan; Kučera, Jan
2023 - český
Instrumentální neutronová aktivační analýza je založena na robustním teoretickém základu a umožňuje analýzu vzorků v pevném stavu bez nutnosti jejich převedení do roztoku. Text metodiky zahrnuje představení základů INAA a příklady postupů používaných pro kontrolu přesnosti výsledků. Uveden je popis postupu analýzy heroinu, kokainu a metamfetaminu. Aplikace pro využití INAA zahrnují odhad čistoty a použitých ředících látek a profilování vzorků drog. Metodika je založena na analýze laboratorních a reálných vzorků. Instrumental neutron activation analysis (INAA) is a robust analytical method theoretically well descibed and understood. INAA works with solid samples, dissolution is not required. The methodology introduces INAA background and lists procedures used for quality control. Protocols for INAA of heroin, cocaine and methamphetamine are described in details. Applications of INAA for psychoactive substances includes estimation of purity and adulterants used and drogs profiling. The metodology is based on measurement of laboratory and real samples. Klíčová slova: NAA; psychotropic substances; methodology Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Instrumentální neutronová aktivační analýza omamných a psychotropních látek, zejména heroinu, kokainu, metamfetaminu a možných adulterantů

Instrumentální neutronová aktivační analýza je založena na robustním teoretickém základu a umožňuje analýzu vzorků v pevném stavu bez nutnosti jejich převedení do roztoku. Text metodiky zahrnuje ...

Kameník, Jan; Kučera, Jan
Ústav jaderné fyziky, 2023

Analýza obsahu prvků v automobilových sklech pomocí neutronové aktivační analýzy a rentgenové fluorescenční analýzy
Kameník, Jan; Fikrle, Marek; Kučera, Jan
2023 - český
Mikrofragmenty skel nesou cenné informace o některých druzích zločinů spojených s vozidly. Metodika popisuje využití Rentgenové fluorescenční analýzy (RFA) a neutronové aktivační analýzy (NAA) pro stanovení prvkových přímesí ve střepech automobilových skel. RFA umožňuje rychlé nedestruktivní testování vzorku, které umožní výběr analytických postupů pro další analýzu. Metoda NAA je časově náročnější, má potenciál poskytovat robustní výsledky pro orgány činné v trestním řízení. Metodika zahrnuje popis obou metod a jejich uplatnění při analýze fragmentů skel. Součástí metodiky jsou výsledky analýzy více než 80 vzorků automobilových skel. Glass microfragments provide valuable information about certain vehicle crimes. The methodology describes application of X-ray fluorescence analysis (XRF) and neutron activation analysis (NAA) of elemental admixtures in vehicle glass fragments. XRF allows rapid and non-destructive test of the sample and helps in selection of protocols for detailed inspections by additional methods. NAA is time demanding, however, has potential to provide robust results for law enforcement agencies. Both methods are described together with protocols of analysis and their variants. The methodology includes results for 80+ vehicle glass samples. Klíčová slova: XRF; INAA; methodology Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Analýza obsahu prvků v automobilových sklech pomocí neutronové aktivační analýzy a rentgenové fluorescenční analýzy

Mikrofragmenty skel nesou cenné informace o některých druzích zločinů spojených s vozidly. Metodika popisuje využití Rentgenové fluorescenční analýzy (RFA) a neutronové aktivační analýzy (NAA) pro ...

Kameník, Jan; Fikrle, Marek; Kučera, Jan
Ústav jaderné fyziky, 2023

The characterization of the collimated beams of fast neutrons with the CLID detecion system
Ansorge, Martin; Novák, Jan; Majerle, Mitja; Kozic, Ján
2022 - anglický
A new detection device for the measurements of light ions (p, d, t, α) emitted as the products of the nuclear reactions induced by fast neutrons (5-33 MeV) was recently developed at the Nuclear Physics Institute of the Czech Academy of Sciences. The main objective of the Chamber-for-Light-Ion-Detection (CLID) is to produce new differential nuclear data of high interest for the material applications related to fusion and aerospace technologies and to potentially test and validate models of nuclear reactions. Hereby the experimental set-up for the measurements with the CLID is described in detail. The experimental characterization of the collimated fast neutron beams produced by the cyclotron-driven converter (p(35 MeV)+Be(2.5 mm)) is presented. In particular, the implementation of the Proton-Recoil-Telescope technique used for neutron energy spectra determination with the CLID is described. Klíčová slova: CLID; collimated fast neutron beams; cyclotron U-120M; NPI; Proton-Recoil-Telescope Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
The characterization of the collimated beams of fast neutrons with the CLID detecion system

A new detection device for the measurements of light ions (p, d, t, α) emitted as the products of the nuclear reactions induced by fast neutrons (5-33 MeV) was recently developed at the Nuclear ...

Ansorge, Martin; Novák, Jan; Majerle, Mitja; Kozic, Ján
Ústav jaderné fyziky, 2022

Strain Measurements on Samples of an 3D-printing Maraging Steel by a High-resolution Neutron Diffraction
Mikula, Pavol; Ryukhtin, Vasil; Michalcová, A.
2022 - anglický
In our contribution we present strain measurements on several samples related to the 3D printing material with an unconventional high-resolution neutron diffraction. This method is based on the three-axis diffractometer setting when a conventional two axis neutron diffraction scanner does not provide a relevant resolution. Klíčová slova: 3D printing material; high resolution; neutron diffraction Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Strain Measurements on Samples of an 3D-printing Maraging Steel by a High-resolution Neutron Diffraction

In our contribution we present strain measurements on several samples related to the 3D printing material with an unconventional high-resolution neutron diffraction. This method is based on the ...

Mikula, Pavol; Ryukhtin, Vasil; Michalcová, A.
Ústav jaderné fyziky, 2022

Spectrometry of neutron field based on p(20)+Be source reaction
Kozic, Ján; Štefánik, Milan
2022 - anglický
The research deals with a spectrometry of neutron field based on the p(20)+Be source reaction. The p(20)+Be interaction stands for a nuclear reaction where protons accelerated to energy of 20 MeV bombard Be target. Produced neutron field has broad energy distribution up to 18 MeV. The research was carried out at the Nuclear Physics Institute of the Czech Academy of Sciences and was motivated by extension of experimental possibilities of the NG-2 target station. To determine the neutron spectrum, the activation foil technique was used. During the experiment, ten activation foils were irradiated. Activated foils were measured using the HPGe detector to determine the reaction rates of observed reactions. The neutron field was simulated in the MCNPX code, and the simulation served as a priori information for the unfolding of the neutron spectrum in the SAND-II code. A determined neutron spectrum is essential for various experiments, e.g., material research, measurements of nuclear data, etc. Klíčová slova: Accelerator-driven neutron source; activation foil technique; beryllium target station NG-2; neutron energy spectrum; SAND-II Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
Spectrometry of neutron field based on p(20)+Be source reaction

The research deals with a spectrometry of neutron field based on the p(20)+Be source reaction. The p(20)+Be interaction stands for a nuclear reaction where protons accelerated to energy of 20 MeV ...

Kozic, Ján; Štefánik, Milan
Ústav jaderné fyziky, 2022

The effect of the heat treatment at 450°C on distribution of residual stresses of modified Cr-Mo steel welds
Mráz, L.; Hervoches, Charles; Mikula, Pavol; Kotora, J.
2020 - anglický
The effect of low-temperature long-term heat treatment on distribution of residual stresses on the modified chromium-molybdenum steel of the type 7 CrMoVTiB10-10 and known as the T24 steel which was studied by using neutron diffraction method, is presented. Klíčová slova: neutron diffraction; stress analysis Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
The effect of the heat treatment at 450°C on distribution of residual stresses of modified Cr-Mo steel welds

The effect of low-temperature long-term heat treatment on distribution of residual stresses on the modified chromium-molybdenum steel of the type 7 CrMoVTiB10-10 and known as the T24 steel which was ...

Mráz, L.; Hervoches, Charles; Mikula, Pavol; Kotora, J.
Ústav jaderné fyziky, 2020

On a possible High-Resolution Residual Strain/Stress Measurements by Three Axis Neutron Diffractometer
Mikula, Pavol; Šaroun, Jan; Rogante, M.
2020 - anglický
The new unconventional high-resolution neutron diffraction three axis set-up for strain/stress measurements of rather large bulk polycrystalline samples is presented. Klíčová slova: neutron diffraction; 3 axis neutron diffractometer Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
On a possible High-Resolution Residual Strain/Stress Measurements by Three Axis Neutron Diffractometer

The new unconventional high-resolution neutron diffraction three axis set-up for strain/stress measurements of rather large bulk polycrystalline samples is presented.

Mikula, Pavol; Šaroun, Jan; Rogante, M.
Ústav jaderné fyziky, 2020

Laser-generated nanoparticles to change physical properties of solids, liquids and gases
Torrisi, Alfio; Cutroneo, Mariapompea; Ceccio, Giovanni; Cannavó, Antonino; Horák, Pavel; Torrisi, L.; Vacík, Jiří
2019 - anglický
Synthesis of nanoparticles was possible employing a Nd: YAG pulsed laser at fundamental harmonic. The production of nanoparticles in water depends mainly on the laser parameters (pulse duration, energy, wavelength), the irradiation conditions (focal spot, repetition rate, irradiation time) and the medium where the ablation occurs (solid target, water, solution concentration). The nanoparticles can be introduced in solids, liquids or gases to change many physical characteristics. The optical properties of polymers and solutions, the wetting ability of liquids, the electron density of laser-generated plasma, represent some examples that can be controlled by the concentration of metallic nanoparticles (Au, Ag, Ti, Cu). Some bio-medical applications will be presented and discussed. Klíčová slova: bio-medical applications; laser; nanoparticles Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Laser-generated nanoparticles to change physical properties of solids, liquids and gases

Synthesis of nanoparticles was possible employing a Nd: YAG pulsed laser at fundamental harmonic. The production of nanoparticles in water depends mainly on the laser parameters (pulse duration, ...

Torrisi, Alfio; Cutroneo, Mariapompea; Ceccio, Giovanni; Cannavó, Antonino; Horák, Pavel; Torrisi, L.; Vacík, Jiří
Ústav jaderné fyziky, 2019

Residual stresses of laser-welded pressure vessel steel determined by X-ray and neutron diffraction
Trojan, K.; Vlk, A.; Čapek, J.; Hervoches, Charles; Ganev, N.
2019 - anglický
To gain insight into the quality of the laser weld, information about the residual stress state across the weld is very useful. In this contribution, the residual stress profiles for lowalloy carbon steel plates of P355NL1 grade, which were laser welded from both sides, are presented. To separate the effects of the production of plates from the welding process, the samples were annealed for stress relieving. Using X-ray and neutron diffraction, the surface and bulk RS profiles were obtained. From the obtained data, first, the difference in the character of the longitudinal (parallel to the weld axis) and the transversal component of the RS tensor can be seen. The longitudinal component has a tensile character with a maximum value approximately 500 MPa. Values and character of the transversal component vary strongly with depth and distance from the weld axis. Klíčová slova: nondestructive examination; ferromagnetic materials; residual stresses Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Residual stresses of laser-welded pressure vessel steel determined by X-ray and neutron diffraction

To gain insight into the quality of the laser weld, information about the residual stress state across the weld is very useful. In this contribution, the residual stress profiles for lowalloy carbon ...

Trojan, K.; Vlk, A.; Čapek, J.; Hervoches, Charles; Ganev, N.
Ústav jaderné fyziky, 2019

On a possible use of neutron three axis diffractometer for studies of elastic and plastic deformation of polycrystalline materials
Mikula, Pavol; Ryukhtin, Vasil; Rogante, M.
2019 - anglický
Feasibility of using a high-resolution three axis neutron diffractometer performance for elastic and plastic deformation studies of metallic polycrystalline samples is presented. The method consists of unconventional set up employing bent perfect crystal (BPC) monochromator and analyzer with a polycrystalline sample in between. After the realization of focusing conditions in real and momentum space at the neutron wavelength of 0.162 nm, a high angular resolution up to FWHM(d/d)=2x10-3 was achieved on the standard Fe(110) sample (2 mm diameter) which then opened the possibility for the measurements of small lattice parameter changes of samples. The feasibility of the instrument for macro-and microstrain as well as grain size studies is demonstrated on the polycrystalline samples of low carbon shear deformed steel wires and the NiTi plates subjected to heat treatment. Klíčová slova: instrumentation; neutron diffraction; strain measurements Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
On a possible use of neutron three axis diffractometer for studies of elastic and plastic deformation of polycrystalline materials

Feasibility of using a high-resolution three axis neutron diffractometer performance for elastic and plastic deformation studies of metallic polycrystalline samples is presented. The method consists ...

Mikula, Pavol; Ryukhtin, Vasil; Rogante, M.
Ústav jaderné fyziky, 2019

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