The Determination of the Chemical Exergy Values of Indonesian Biomass and Biomass Residues

2014 ◽  
Vol 8 (1) ◽  
pp. 88-93 ◽  
Author(s):  
Selçuk Bilgen
Keyword(s):  
Biomass Residues ◽  
Chemical Exergy

Determination of drying characteristics of biomass residues to be used as a renewable fuel

2015 ◽  
Vol 208 ◽  
pp. S15 ◽  
Author(s):  
Awf Al Kassir ◽  
Talal Yusaf ◽  
Raúl Kassir Al Karany ◽  
Ihsan Hamawand
Keyword(s):  
Drying Characteristics ◽  
Renewable Fuel ◽  
Biomass Residues

scholarly journals Pressurized Steam Conversion of Biomass Residues for Liquid Hydrocarbons Generation

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1034
Author(s):  
Francesco Miccio ◽  
Elettra Papa ◽  
Annalisa Natali Murri ◽  
Elena Landi ◽  
Matteo Minelli
Keyword(s):  
Liquid Fraction ◽  
Batch Reactor ◽  
Operating Conditions ◽  
Nonpolar Solvent ◽  
Thermochemical Conversion ◽  
Liquid Hydrocarbons ◽  
Steam Conversion ◽  
Biomass Residues ◽  
Alternative Feedstock

Biomass residues are often considered as a resource if conveniently converted in fuel and alternative feedstock for chemical processes, and their conversion into valuable products may occur by different pathways. This work is focused on the thermochemical conversion at moderate temperature and in steam atmosphere, a mild process in comparison to hydrothermal liquefaction, followed by extraction of soluble products in a solvent. Such process has been already applied to various residues and here extended to the case of marc, the residual pomace from wine making, largely produced worldwide. A pressurized batch reactor was used for the quantitative determination of produced solid and liquid fractions, and their qualitative characterization was performed by instrumental analyses. The pressurized steam conversion of marc was effective, providing a yield in liquid fraction, upon extraction in solvent, up to 30% of the raw dried biomass. The use of polar and nonpolar solvent for the extraction of the liquid fraction was inspected. Applied operating conditions, namely residence time in the batch reactor and extraction modality, showed a significant influence on the process performance. In particular, long residence and extraction times and use of nonpolar solvent substantially improved the yield in liquid fraction.

Determination of chemical exergy for compounds of biotechnological interest using different estimation methodologies

2020 ◽  
Vol 37 (3) ◽  
pp. 607-615
Author(s):  
Suzimara R. Silva ◽  
Túlio F. Anacleto ◽  
Esly F. Costa ◽  
Boutros Sarrouh ◽  
Andréa O. S. Costa
Keyword(s):  
Chemical Exergy

A group contribution method for determination of the standard molar chemical exergy of organic compounds

Energy ◽  
2014 ◽  
Vol 70 ◽  
pp. 288-297 ◽  
Author(s):  
Farhad Gharagheizi ◽  
Poorandokht Ilani-Kashkouli ◽  
Amir H. Mohammadi ◽  
Deresh Ramjugernath
Keyword(s):  
Organic Compounds ◽  
Group Contribution ◽  
Group Contribution Method ◽  
Chemical Exergy

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

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