scholarly journals Time-dependent changes in chemical composition and detectable period by GC/MS of petroleum-based liquid fuel residues from fire debris of various floor materials

2021 ◽  
Author(s):  
Iori Matsuoka ◽  
Takao Hagiwara ◽  
Masaaki Kasamatsu ◽  
Yasuhiro Suzuki ◽  
Masahiro Nakagawa ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Liquid Fuel ◽  
Time Dependent ◽  
Fire Debris

scholarly journals The role of heat conduction to the formation of [WC]-type planetary nebulae

2011 ◽  
Vol 7 (S283) ◽  
pp. 494-495
Author(s):  
Christer Sandin ◽  
Matthias Steffen ◽  
Ralf Jacob ◽  
Detlef Schönberner ◽  
Ute Rühling ◽  
...  
Keyword(s):  
Heat Conduction ◽  
Chemical Composition ◽  
Physical Properties ◽  
Planetary Nebulae ◽  
Time Dependent ◽  
Diffuse Emission ◽  
Hydrodynamic Models ◽  
X Ray ◽  
Central Stars

AbstractX-ray observations of young Planetary Nebulæ (PNe) have revealed diffuse emission in extended regions around both H-rich and H-deficient central stars. In order to also reproduce physical properties of H-deficient objects, we have, at first, extended our time-dependent radiation-hydrodynamic models with heat conduction for such conditions. Here we present some of the important physical concepts, which determine how and when a hot wind-blown bubble forms. In this study we have had to consider the, largely unknown, evolution of the CSPN, the slow (AGB) wind, the fast hot-CSPN wind, and the chemical composition. The main conclusion of our work is that heat conduction is needed to explain X-ray properties of wind-blown bubbles also in H-deficient objects.

scholarly journals Corrosive Environment Assessment and Corrosion-Induced Rockbolt Failure Analysis in a Costal Underground Mine

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Qifeng Guo ◽  
Jiliang Pan ◽  
Min Wang ◽  
Meifeng Cai ◽  
Xun Xi
Keyword(s):  
Chemical Composition ◽  
Corrosion Rate ◽  
Time Dependent ◽  
Gold Mine ◽  
System Failure ◽  
Corrosive Environment ◽  
Support Design ◽  
Ph Values ◽  
Environment Assessment

As an effective ground-reinforcing system, rockbolts have been widely used in underground excavations. Corrosion of rockbolts has been one of the most reasons for rockbolts system failure. In this paper, the chemical composition and pH values of the groundwater in Sanshandao Gold mine are first tested. Corrosion of the slotted rockbolts used in roadways of the mine is analysed. The corrosion rate of rockbolts is evaluated based on experimental results from similar corrosive conditions. A time-dependent analytical model on anchoring force degradation caused by corrosion of the rockbolt is developed. Furthermore, the effects of corrosion rate and geometric parameters of the slotted rockbolts on anchoring force degradation are discussed. Suggestions on rockbolts support design in corrosive conditions are given. It has been found that, with the corrosion time increasing, the anchoring force between the rock and the rockbolt gradually decreases. The larger the corrosion rate is, the faster the anchoring force decreases. For long-term service roadways under corrosive conditions, a slotted rockbolt with a smaller radius and thicker wall can enhance the anchoring force.

Uniform liquid‐fuel layer produced in a cryogenic inertial fusion target by a time‐dependent thermal gradient

1990 ◽  
Vol 8 (4) ◽  
pp. 3319-3323 ◽  
Author(s):  
R. Q. Gram ◽  
M. D. Wittman ◽  
C. Immesoete ◽  
H. Kim ◽  
R. S. Craxton ◽  
...  
Keyword(s):  
Thermal Gradient ◽  
Liquid Fuel ◽  
Time Dependent ◽  
Inertial Fusion ◽  
Fuel Layer ◽  
Fusion Target ◽  
Uniform Liquid

scholarly journals Plasma-assisted oxidation of Cu(100) and Cu(111)

2021 ◽  
Author(s):  
Sebastian Kunze ◽  
Liviu C. Tănase ◽  
Mauricio J. Prieto ◽  
Philipp Grosse ◽  
Fabian Scholten ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Surface Structure ◽  
Room Temperature ◽  
Oxygen Plasma ◽  
Low Pressure ◽  
Time Dependent ◽  
Pressure Oxygen

A low-pressure oxygen plasma oxidized Cu(100) and Cu(111) surfaces at room temperature. The time-dependent evolution of surface structure and chemical composition is reported in detail for a range of exposure times up to 30 min.

scholarly journals Determination of in vitro rumen digestibility and potential feed value of tiger nut varieties

2021 ◽  
Vol 50 (5) ◽  
Author(s):  
T. Ayaşan ◽  
E. Sucu ◽  
I. Ülger ◽  
H. Hızlı ◽  
P. Cubukcu ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Nutritive Value ◽  
Energy Content ◽  
Rumen Fluid ◽  
Gas Production ◽  
Time Dependent ◽  
In Vivo Studies ◽  
In Vitro Digestibility ◽  
In Vitro Gas Production

Tiger nut (Cyperus esculentus L.), or chufa, is a plant that is found in nature and is cultivated for its edible tubers. The purpose of this study was to determine the chemical composition, nutritive value, and in vitro digestibility of three tiger nut varieties using the in vitro gas production technique. These varieties were Sarışeker (yellow), Introduction 1, and Balyumru (brown). Rumen fluid was obtained from two cannulated Holstein animals. Time-dependent in vitro gas production was monitored at 3, 6, 9, 12, 24, 48, 72, and 96 hours of incubation. The varieties differed in dry matter (DM), crude ash (CA), ether extract (EE), neutral detergent fibre (NDF), and non-fibre carbohydrate (NFC) content (P <0.05). They also differed in the instantaneous volume of gas produced and in time-dependent gas production. Balyumru produced more gas at the onset of incubation than Introduction 1 and Sarışeker. However, over time, the gas produced by digestion of Introduction 1 exceeded the other two varieties. The amounts of gas produced at each time-point were intercorrelated. It is recommended that these results should lead to further evaluation in in vivo studies. Keywords: chemical composition, energy content, in vitro gas production

COUPLE, A Time-Dependent Coupled Neutronics and Thermal-Hydraulics Code, and its Application to MSFR

2014 ◽  
Author(s):  
Dalin Zhang ◽  
Zhi-Gang Zhai ◽  
Andrei Rineiski ◽  
Zhangpeng Guo ◽  
Chenglong Wang ◽  
...  
Keyword(s):  
Molten Salt ◽  
Liquid Fuel ◽  
Time Dependent ◽  
Molten Salt Reactor ◽  
Thermal Hydraulics ◽  
Delayed Neutron ◽  
Fuel Flow ◽  
Reactor Optimization ◽  
Fuel Characteristics ◽  
Significant Attention

Molten salt reactor (MSR) using liquid fuel is one of the Generation-IV candidate reactors. Its liquid fuel characteristics are fundamentally different from those of the conventional solid-fuel reactors, especially the much stronger neutronics and thermal hydraulics coupling is drawing significant attention. In this study, the fundamental thermal hydraulic model, neutronic model, and some auxiliary models were established for the liquid-fuel reactors, and a time-dependent coupled neutronics and thermal hydraulics code named COUPLE was developed to solve the mathematic models by the numerical method. After the code was verified, it was applied to the molten salt fast reactor (MSFR) to perform the steady state calculation. The distributions of the neutron fluxes, delayed neutron precursors, velocity, and temperature were obtained and presented. The results show that the liquid fuel flow affects the delayed neutron precursors significantly, while slightly influences the neutron fluxes. The flow in the MSFR core generates a vortex near the fertile tank, which leads to the maximal temperature about 1100 K at the centre of the vortex. The results can provide some useful information for the reactor optimization.

scholarly journals Chemical Composition of Liquid Fuel Produced by Co-pyrolysis of Sugarcane Bagasse and Sludge Palm Oil Using Zeolite-Y as Catalyst

2018 ◽  
Vol 34 (3) ◽  
pp. 1533-1540 ◽  
Author(s):  
Raden Supriyanto ◽  
Wasinton Simanjuntak ◽  
Kamisah D. Pandiangan ◽  
Rudy T. M. Situmeang ◽  
Muhammad Yusry Ahmadhani
Keyword(s):  
Chemical Composition ◽  
Sugarcane Bagasse ◽  
Palm Oil ◽  
Liquid Fuel ◽  
Zeolite Y ◽  
Sludge Palm Oil

scholarly journals Effects of a New Equation of State on Cepheid Pulsation Models

2002 ◽  
Vol 185 ◽  
pp. 424-425
Author(s):  
S. Petroni ◽  
V. Castellani ◽  
G. Bono ◽  
M. Marconi
Keyword(s):  
Chemical Composition ◽  
Equation Of State ◽  
Numerical Experiments ◽  
Time Dependent ◽  
Instability Strip ◽  
Hydrodynamical Models ◽  
Red Edge ◽  
New Equation

AbstractWe present the results of several numerical experiments aimed at testing the dependence of theoretical observables predicted by Cepheid hydrodynamical models on the equation of state (EOS). We focus our attention on nonlinear and time-dependent Cepheid convective models at solar chemical composition. We find that current predictions for both the blue and red edge of the instability strip present a mild dependence on the EOS. The same outcome applies to the morphology of the lightcurves.

The Theoretical PLC Relations of Classical Cepheids

1999 ◽  
Vol 190 ◽  
pp. 557-558
Author(s):  
Marcella Marconi
Keyword(s):  
Chemical Composition ◽  
Distance Scale ◽  
Time Dependent ◽  
Classical Cepheids

On the basis of an extensive grid of Cepheid, nonlinear, nonlocal, time-dependent convective models by Bono et al., analytical Period-Color-Luminosity (PLC) relations as a function of chemical composition were evaluated and compared with observations in LMC and SMC. I provide an analysis of PL and PLC residuals and suggestions for disentangling the effects of reddening and metallicity on the Cepheid distance scale.

scholarly journals Accretion and outflow of gas in Markarian 509

2012 ◽  
Vol 8 (S290) ◽  
pp. 45-48
Author(s):  
Jelle Kaastra ◽  
Pierre-Olivier Petrucci ◽  
Massimo Cappi ◽  
Nahum Arav ◽  
Ehud Behar ◽  
...  
Keyword(s):  
Black Hole ◽  
Chemical Composition ◽  
Time Scales ◽  
Time Dependent ◽  
Central Black Hole ◽  
Solar Mass ◽  
X Ray ◽  
The Core ◽  
Upper Limits ◽  
Central Regions

AbstractA major uncertainty in models for photoionised outflows in AGN is the distance of the gas to the central black hole. We present the results of a massive multiwavelength monitoring campaign on the bright Seyfert 1 galaxy Mrk 509 to constrain the location of the outflow components dominating the soft X-ray band. Mrk 509 was monitored by XMM-Newton, Integral, Chandra, HST/COS and Swift in 2009. We have studied the response of the photoionised gas to the changes in the ionising flux produced by the central regions. We were able to put tight constraints on the variability of the absorbers from day to year time scales. This allowed us to develop a model for the time-dependent photoionisation in this source. We find that the more highly ionised gas producing most X-ray line opacity is at least 5 pc away from the core; upper limits to the distance of various absorbing components range between 20 pc up to a few kpc. The more lowly ionised gas producing most UV line opacity is at least 100 pc away from the nucleus. These results point to an origin of the dominant, slow (v<1000 km s−1) outflow components in the NLR or torus-region of Mrk 509. We find that while the kinetic luminosity of the outflow is small, the mass carried away is likely larger than the 0.5 Solar mass per year accreting onto the black hole. We also determined the chemical composition of the outflow as well as valuable constraints on the different emission regions. We find for instance that the resolved component of the Fe-K line originates from a region 40–1000 gravitational radii from the black hole, and that the soft excess is produced by Comptonisation in a warm (0.2–1 keV), optically thick (τ~ 10–20) corona near the inner part of the disk.

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