Temat: empirical equation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Prediction of Martensite Start Temperatures of Highly Alloyed Steels
Autorzy:: Lee, Seok-Jae
Jung, Minsu
Powiązania:: https://bibliotekanauki.pl/articles/2049415.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: martensite start temperature
empirical equation
highly alloyed steel
Opis:: We propose an empirical equation to predict the martensite start temperatures of highly alloyed steels containing more than 3 wt.% of Ni or Cr or 2 wt.% of Mo, W, or Co. The martensite start temperature calculated by the proposed equation was in good agreement with experimental data owing to not only the derivation from experimental data of alloy steels with a wide range of chemical compositions but also the interaction term between carbon and carbide-forming alloying elements.
Źródło:: Archives of Metallurgy and Materials; 2021, 66, 1; 107-111
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The use of empirical equations for seepage estimation in comparison with observed losses from irrigation canals
Autorzy:: Syed, Naeem S.B
Shuqi, Zhao
Powiązania:: https://bibliotekanauki.pl/articles/27312639.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: empirical equation
equation modification
seepage estimation
seepage loss
seepage rate
Opis:: This study analyses and presents a technical comparison of seepage estimation from 11 empirical equations with measured seepage losses by the inflow-outflow method from two lined and unlined secondary irrigation canals sub-divided into different reach lengths. A significant margin of error was observed between empirical and inflowoutflow methods, hence modifications in empirical equations were performed. Results reveal that the average seepage losses observed in unlined and lined canals by inflow-outflow method were 9.15 and 3.89%, respectively. Moreover, only the Chinese equation estimated seepage losses for an unlined canal as similar to observed losses (0.11 m3 ∙s-1) whereas the Indian equation estimated similar results for a lined canal to those observed in the field (0.09 m3∙s-1). However, the rest of empirical equations were modified in accordance with error percentage with regard to the observed losses. The empirical equations were then observed to estimate reliable results of seepage.
Źródło:: Journal of Water and Land Development; 2023, 57; 21--29
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Zeta potential of Polish copper-bearing shale in the absence and presence of flotation frothers
Autorzy:: Peng, M.
Ratajczak, T.
Drzymała, J.
Powiązania:: https://bibliotekanauki.pl/articles/89095.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:: zeta potential
frother
flotation
shale
pH
isoelectric point
IEP
empirical equation
Opis:: In this paper, zeta potential as a function of pH of copper-bearing shale, which is mined in Poland by KGHM, was investigated. The measurements were conducted in water and aqueous solutions of selected flotation frothers. It was established that for investigated copper-bearing shale, after dispersion in water, the isoelectric point (IEP) occurs at pH=3.5. Addition of frothers decreased the IEP on the pH scale and the IEP for butanol was 1.93, for MIBC 2.90 and for eicosaethylene glycol hexadecyl ether (C16E20) 2.76. In the case of introducing frothers changed, the zeta potential becomes less negative. An empirical equation, having two adjustable parameters, was used in the paper to approximate the course of the zeta potential-pH curve. The equation showed a very good approximation of the zeta potential of the investigated shale either in water or frother aqueous solutions.
Źródło:: Mining Science; 2014, 21; 57-63
2300-9586
2353-5423
Pojawia się w:: Mining Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Analiza dokładności obrębowej metody inwentaryzacji lasu opartej na losowaniu warstwowym
The accuracy of a novel forest inventory method based on stratified sampling
Autorzy:: Bruchwald, A.
Wójcik, R.
Zajączkowski, S.
Powiązania:: https://bibliotekanauki.pl/articles/1026758.pdf
Data publikacji:: 2003
Wydawca:: Polskie Towarzystwo Leśne
Tematy:: losowanie warstwowe
lesnictwo
inwentaryzacja lasu
urzadzanie lasu
dokladnosc
metoda obrebowa
alder
form factor
empirical equation
Opis:: The paper provides an analysis of the accuracy of a novel forest inventory method for calculating stand volume based on stratified sampling. The analysis included stand age as an efficient element used in the construction of the strata, as well as assessment results of various methods of sample allocation. This novel inventory method was compared with the methods based on simple random sampling or systematic sampling. The theory of all analysed methods for calculating stand volume is based on the mathematical statistics called a „representative sampling method”.
Źródło:: Sylwan; 2003, 147, 05; 13-20
0039-7660
Pojawia się w:: Sylwan
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Wzory empiryczne do określania pierśnicowych liczb kształtu drzewostanów buka nizinnego
Empirical equations for determination dbh form factors for the lowland beech stands
Autorzy:: Dudzińska, M.
Powiązania:: https://bibliotekanauki.pl/articles/1178268.pdf
Data publikacji:: 2003
Wydawca:: Polskie Towarzystwo Leśne
Tematy:: drzewostany bukowe
buk zwyczajny
drzewostany nizinne
lesnictwo
Fagus sylvatica
dendrologia
piersnicowa liczba ksztaltu
wzory empiryczne
beech
form factor
empirical equation
Opis:: The paper presents the results of studies, which have led to the development of empirical equations for determining various kinds of dbh form factors. The studies concerned beech stands growing in the north of Poland. Dbh form factors for stand can be determined using the said equations on the basis of the average dbh or average stand height. The same set of empirical equations was also developed to determine form factors for trees.
Źródło:: Sylwan; 2003, 147, 01; 35-40
0039-7660
Pojawia się w:: Sylwan
Dostawca treści:: Biblioteka Nauki

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