No (6271)
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Materials characterization of mortar samples from the archaeological context of the Basilica of St. Wenceslas in Stará Boleslav
Válek, Jan; Kozlovcev, Petr; Svorová Pawełkowicz, Sylwia; Kotková, Kristýna
2024 - Czech
The mortar samples were characterized by optical microscopy and SEM-EDS. The aim of the study was to compare them with each other. All three samples have similar structure and material composition. The raw material for the lime was fine-grained sedimentary limestone with high CaCO3 content. The lime matrix has the character of air lime. In addition to the lime binder, there is also a mud-clay binder. This is separate from the lime binder. The sand grains are surrounded by the lime binder and there is a mud-clay filler in the intermediate space, indicating that this component was added as an admixture to the mortar only during use in construction. The sand used corresponds to the local conditions, both to aeolian sands (loess and loess sediments) dominated by worked quartz clasts and, in part, to sediments of fluvial origin (here mainly lithoclasts transported over a greater distance). Vzorky malt byly popsány pomoci optické mikroskopie a SEM-EDS. Cílem studie bylo jejich vzájemné porovnání. Všechny tři vzorky mají podobnou strukturu i materiálové složení. Surovinou pro výrobu vápna byl jemnozrnný sedimentární vápenec s vysokým obsahem CaCO3. Vápenná matrice má charakter vzdušného vápna. Kromě vápenného pojiva se vyskytuje též prachovojílové pojivo. To je odděleno od vápenného. Zrna písku jsou obalena vápenným pojivem a v meziprostoru je prachovojílová výplň, což ukazuje na přidání této složky jako příměsi do malty až během použití při stavbě. Použitý písek odpovídá místním poměrům, a to jak eolickým pískům (spraším a sprašovým sedimentům) s dominantním výskytem opracovaných křemenných klastů, tak částečně i sedimentům fluviálního původu (zde se jedná především o litoklasty transportované na větší vzdálenost).
Keywords:
historic mortar; microscopy; lime binder; earth binder
Available at various institutes of the ASCR
Materials characterization of mortar samples from the archaeological context of the Basilica of St. Wenceslas in Stará Boleslav
The mortar samples were characterized by optical microscopy and SEM-EDS. The aim of the study was to compare them with each other. All three samples have similar structure and material composition. ...
Susceptibility tests of liner materials of composite vessels to the refrigerant gases
Šperl, Martin; Vála, Ondřej; Bejdl, Jan
2024 - Czech
Research study about the influences of pressurized refrigerants atmosphere to some material properties of liners Výzkumná studie o vlivu atmosféry tlakového chladiva na některé materiálové vlastnosti linerů kompozitních nádob
Keywords:
composite vessel; refrigerant; polymer liner; strength
Available at various institutes of the ASCR
Susceptibility tests of liner materials of composite vessels to the refrigerant gases
Research study about the influences of pressurized refrigerants atmosphere to some material properties of liners
Experimental research of mechanical and fracture mechanical properties of the oil pipeline DN 150 Bělčice – Třemošná, marked as L186, steel 11 353
Gajdoš, Lubomír; Šperl, Martin; Šorm, Filip; Bejdl, Jan
2024 - Czech
Experimental research of mechanical and fracture mechanical properties of the pipe specimens taken from oil pipeline DN 150. In addition to basic static tests and fracture toughness tests, the research also included the determination of the kinetic of fatigue crack growth, incl. analysis of critical crack size. Experimentální výzkum mechanických a lomově-mechanických vlastností trubních vzorků z produktovodu DN 150. Kromě základních statických zkoušek a zkoušek na určení lomové houževnatosti bylo součástí výzkumu i určení kinetiky růstu únavových trhlin vč. analýzy kritické velikosti trhlin.
Keywords:
J integral; pipeline; toughness; crack
Available at various institutes of the ASCR
Experimental research of mechanical and fracture mechanical properties of the oil pipeline DN 150 Bělčice – Třemošná, marked as L186, steel 11 353
Experimental research of mechanical and fracture mechanical properties of the pipe specimens taken from oil pipeline DN 150. In addition to basic static tests and fracture toughness tests, the ...
Experimental research of mechanical and fracture-mechanical properties of P355, L360NB and 42CrMo4 steels exposed for half year in a pressurized hydrogen atmosphere
Šperl, Martin; Gajdoš, Lubomír; Šorm, Filip; Bejdl, Jan
2024 - Czech
Research of the influence of hydrogen on the mechanical and fracture mechanical properties of specific steels depending on the exposition time. Výzkum vlivu vodíku na mechanické a lomově mechanické vlastnosti daných ocelí v závislosti na čase expozice.
Keywords:
pipeline steel; hydrogen exposition; fracture toughness; notch toughness
Available at various institutes of the ASCR
Experimental research of mechanical and fracture-mechanical properties of P355, L360NB and 42CrMo4 steels exposed for half year in a pressurized hydrogen atmosphere
Research of the influence of hydrogen on the mechanical and fracture mechanical properties of specific steels depending on the exposition time.
Posouzení příčin poruch plynovodů po přimíchání vodíku do zemního plynu
Kec, J.; Šperl, Martin
2024 - Czech
This document summarizes the probabilities of pipeline failures due to hydrogen blending into natural gas. Tento dokument sumarizuje pravděpodobnosti výskytu poruch v plynovodu v důsledku přimíchávání vodíku do zemního plynu.
Keywords:
pipeline; hydrogen blending; defects; reliability
Available at various institutes of the ASCR
Posouzení příčin poruch plynovodů po přimíchání vodíku do zemního plynu
This document summarizes the probabilities of pipeline failures due to hydrogen blending into natural gas.
Design analysis of the heat exchanger between the primary and the intermediate circuits of the small modular reactor DAVID
Kobylka, D.; Hrubý, Jan; Kordík, Jozef; Gabriel, Dušan; Marek, René; Isoz, Martin
2023 - Czech
The report summarizes the joint results of the Department of Nuclear Reactors FNSPE, CTU and IT CAS, in the area of thermal and hydraulic calculations of the heat exchanger between the primary and intermediate circuits of the developed small modular reactor (SMR) DAVID. The assignment parameters were further specified during control days and with updated documentation. During the analysis of the initial system parameters, it was found that the original geometric configuration of the exchanger had a completely insufficient surface for heat transfer. A decision was made, several parameters were modified and based on a series of calculations using two independent simplified models, a reasonable configuration with a significantly smaller diameter of the tubes in a significantly larger number was chosen. The pressure losses on both sides of the heat exchanger are within normal ranges and will not cause problems with the construction of these circuits. Although there are differences between the results from both used models, their comparison shows that the chosen different calculation methods lead to approximately the same results and the models do not show fundamental errors.
Keywords:
small modular reactor DAVID; thermodynamics; heat exchanger
Available at various institutes of the ASCR
Design analysis of the heat exchanger between the primary and the intermediate circuits of the small modular reactor DAVID
The report summarizes the joint results of the Department of Nuclear Reactors FNSPE, CTU and IT CAS, in the area of thermal and hydraulic calculations of the heat exchanger between the primary and ...
SMV-2023-30: ILA compact
Hrabina, Jan; Holá, Miroslava; Oulehla, Jindřich; Pokorný, Pavel; Lazar, Josef; Šarlejová, Tatiana; Šlechtický, Stanislav
2023 - Czech
The contractual research was oriented towards the development of optical frequency reference intended for the frequency stabilisation of ultra-compact semiconductor laser sources. This optical reference is based on an absorption cell filled with ultra-pure absorption gases, and it allows precise locking of the lasers with laser spectroscopy methods. The cell will serve as a reference of optical frequencies in systems of laser standards (532-633 nm wavelengths). Smluvní výzkum byl zaměřen na vývoj reference optického kmitočtů pro frekvenční stabilizaci kompaktních laserových zdrojů. Tato optická reference je založena na bázi absorpční kyvety plněných čistými plyny a dovoluje stabilizaci laserových zdrojů pomocí metod laserové spektroskopie. Kyveta je určena k použití jako reference optických kmitočtů laserové normály pracující v pásmu vlnových délek 532-633 nm.
Keywords:
absorption cell; iodine cell; laser spectroscopy; stabilised laser; frequency stability
Available at various institutes of the ASCR
SMV-2023-30: ILA compact
The contractual research was oriented towards the development of optical frequency reference intended for the frequency stabilisation of ultra-compact semiconductor laser sources. This optical ...
SMV-2023-34: ULM2023
Hrabina, Jan; Holá, Miroslava; Oulehla, Jindřich; Pokorný, Pavel; Lazar, Josef; Šarlejová, Tatiana; Šlechtický, Stanislav
2023 - Czech
The contractual research was oriented towards the development of optical frequency reference intended for the frequency stabilisation of ultra-compact semiconductor laser sources. This optical reference is based on an absorption cell filled with ultra-pure absorption gases, and it allows precise locking of the lasers with laser spectroscopy methods. The cell will serve as a reference of optical frequencies in systems of laser standards (532-633 nm wavelengths). Smluvní výzkum byl zaměřen na vývoj reference optického kmitočtů pro frekvenční stabilizaci kompaktních laserových zdrojů. Tato optická reference je založena na bázi absorpční kyvety plněných čistými plyny a dovoluje stabilizaci laserových zdrojů pomocí metod laserové spektroskopie. Kyveta je určena k použití jako reference optických kmitočtů laserové normály pracující v pásmu vlnových délek 532-633 nm.
Keywords:
absorption cell; iodine cell; laser spectroscopy; stabilised laser; frequency stability
Available at various institutes of the ASCR
SMV-2023-34: ULM2023
The contractual research was oriented towards the development of optical frequency reference intended for the frequency stabilisation of ultra-compact semiconductor laser sources. This optical ...
SMV-2023-35: NIM Multipass
Hrabina, Jan; Holá, Miroslava; Oulehla, Jindřich; Pokorný, Pavel; Lazar, Josef; Šarlejová, Tatiana; Šlechtický, Stanislav
2023 - Czech
The contractual research was oriented towards the development of optical frequency references intended for the frequency stabilisation of ultra-compact laser sources. These optical references are based on absorption cells filled with ultra-pure absorption gases and they allow precise locking of the lasers with the methods of laser spectroscopy. The cells will serve as the references of optical frequencies in systems of laser standards (532 nm wavelengths). Smluvní výzkum byl zaměřen na vývoj referencí optických kmitočtů pro frekvenční stabilizaci kompaktních laserových zdrojů. Tyto optické reference jsou založeny na bázi absorpčních kyvet plněných čistými plyny a dovolují stabilizaci laserových zdrojů pomocí metod laserové spektroskopie. Kyvety jsou určené k použití jako reference optických kmitočtů pro laserové normály pracující v pásmu vlnových délek 532 nm.
Keywords:
absorption cell; iodine cell; laser spectroscopy; stabilised laser; frequency stability
Available at various institutes of the ASCR
SMV-2023-35: NIM Multipass
The contractual research was oriented towards the development of optical frequency references intended for the frequency stabilisation of ultra-compact laser sources. These optical references are ...
SMV-2023-36: Wuhan Space
Hrabina, Jan; Holá, Miroslava; Oulehla, Jindřich; Pokorný, Pavel; Lazar, Josef; Šarlejová, Tatiana; Šlechtický, Stanislav
2023 - Czech
The contractual research was oriented towards the development of optical frequency reference intended for the frequency stabilisation of ultra-compact semiconductor laser sources. This optical reference is based on an absorption cell filled with ultra-pure absorption gases, and it allows precise locking of the lasers with laser spectroscopy methods. The cell will serve as a reference of optical frequencies in systems of laser standards (532-633 nm wavelengths). Smluvní výzkum byl zaměřen na vývoj reference optického kmitočtů pro frekvenční stabilizaci kompaktních laserových zdrojů. Tato optická reference je založena na bázi absorpční kyvety plněných čistými plyny a dovoluje stabilizaci laserových zdrojů pomocí metod laserové spektroskopie. Kyveta je určena k použití jako reference optických kmitočtů laserové normály pracující v pásmu vlnových délek 532-633 nm.
Keywords:
absorption cell; iodine cell; laser spectroscopy; stabilised laser; frequency stability
Available at various institutes of the ASCR
SMV-2023-36: Wuhan Space
The contractual research was oriented towards the development of optical frequency reference intended for the frequency stabilisation of ultra-compact semiconductor laser sources. This optical ...
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