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Wyświetlanie 1-15 z 33
Tytuł:
Qualitative and quantitative evaluation of secondary metabolites of different plant extracts of Nothapodytes foetida (Wight) Sleumer an important endangered medicinal tree
Autorzy:
Bai, D. Sunitha
Suvarchala, V.
Pavani, Ch.
Chaithanya, G.
Spoorthi, V.
Shasthree, T.
Powiązania:
https://bibliotekanauki.pl/articles/1839343.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Camptothecin
phytochemicals
alkaloids
flavonoids
glycosides
tannins
phenols
triterpenoids
saponins
Nothapodytes foetida
Opis:
The present study of phytochemical screening has revealed valuable information about the chemical constituents of Nothapodytes foetida. Phytochemical analysis of leaves, stem, bark and root extracts of Nothapodytes foetida was performed using different solvent systems such as chloroform, butanol, hexane, methanol and acetonitrile for the presence of different phytochemicals with standard procedures. The phytochemical screening (both qualitative and quantitative) of variousplant extracts of Nothapodytes foetida revealed the presence of different phytoconstituents such as alkaloids, flavonoids, glycosides, tannins, phenols and triterpenoids. Among all the solvents tested, methanol, butanol and chloroform extract of leaf, stem, bark and root showed high concentration of all phytoconstituents compared to hexane and acetonitrile solvent extracts. The total quantity of secondary metabolites was evaluated by using the standard procedures and the line of regression and the regression coefficient estimated from the calibration curve of various standards. The highest quantity of phytoconstituent present in the plant extracts was identified to be alkaloids. The alkaloid content of leaf was evaluated to be 66.11±0.47, whereas stem possess 56.27±0.38, bark 59.02±0.17 and root 62.34±0.27 mg AE/gm of extracts and subsequent high amounts of phytoconstituents identified was flavonoids, tannins, phenols and saponins. Phytochemical screening of Nothapodytes foetidaused in the medical field for the design of new drugs.
Źródło:
World Scientific News; 2021, 162; 43-59
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diffusion of Potassium on the W(112) Plane Preadsorbed by Ni Atoms: Field Emission Current Fluctuations - Autocorrelation Study
Autorzy:
Biernat, T.
Błaszczyszyn, R.
Kleint, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/2027391.pdf
Data publikacji:
2001-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.70.+q
68.37.Vj
68.43.Jk
05.40.Ca
Opis:
Diffusion of potassium adsorbate on the W(112) plane with preadsorbed nickel was investigated by means of the autocorrelation function of field emission current fluctuations. A comparison of the experimental autocorrelation function with that of a theoretical calculation by Gesley and Swanson gives the surface diffusion coefficient of potassium. From its temperature dependence the diffusion activation energy at several Ni pre-coverages for a constant potassium coverage (Θ$\text{}_{K}$=0.4) is derived. The dependence of the activation energy for potassium surface diffusion on the nickel coverage - first reduction and then an increase with increasing Ni coverage - is observed. This is in agreement with the results obtained from the spectral analysis of the field emission current fluctuations of the same system. The decrease is understood to be a result of the smoothing effect caused by Ni atoms on the W(112) plane.
Źródło:
Acta Physica Polonica A; 2001, 99, 6; 665-672
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Muon Spin Rotation Studies of the Vortex Matter in the High-T$\text{}_{c}$ Superconductor Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+δ}$
Autorzy:
Blasius, T.
Niedermayer, Ch.
Tallon, J. L.
Pooke, D. M.
Golnik, A.
Noakes, D. R.
Stronach, C. E.
Ansaldo, E. J.
Henn, R. W.
Lin, C. T.
Bernhard, C.
Powiązania:
https://bibliotekanauki.pl/articles/2011022.pdf
Data publikacji:
1999-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.60.Ge
74.25.Dw
74.72.Hs
76.75.+i
Opis:
We report muon spin rotation studies of the magnetic field distribution n(B) in the vortex state of the high-temperature superconductor Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+δ}$. From our data on three sets of overdoped, nearly optimized and underdoped single crystals we obtain evidence for a two-stage melting process of the vortex matter under equilibrium conditions. In the irreversible regime well below the irreversibility line we observe a transition in the vortex state which we associate with an intra-planar melting transition. The resulting flux-line liquid phase persists over a sizeable temperature interval before the inter-planar decoupling of the individual vortex lines takes place in a second step at the irreversibility line, resulting in a pancake liquid phase.
Źródło:
Acta Physica Polonica A; 1999, 96, 2; 245-258
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry and Tectonic Environments of Aphibolites Bethampudi Anorthosite Complex, Khammam Schist Belt, Telangana, India
Autorzy:
Brahmaiah, T.
Ravi, Ch.
Basha, U. Imran
Prasad, K. S. Sai
Powiązania:
https://bibliotekanauki.pl/articles/1075430.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
E-MORB and Subduction zone
Geochemistry and Tectonic Environments
MORB
N-MORB
Tholeiitic
Opis:
The Bethampudi anorthosite complex is essentially a leucograbbro (gabboric anorthosite and anorthositic gabbro), anorthosites, amphibolites, and pegmatite occur as concordant or discordent bodies. This work involves detailed geological geochemical investigations of amphibolites so as to reveal their possible protolith. The field relaltions, major, trace and rare earth element compositions of ampbibolites suggest that they are petrogenetically related to anorthosites by fractional crystallisation. Protoliths of the amphibolites show a tholeiitic signature that prevails over the sub-alkaline nature and E-MORB affinities. They were generated from a depleted mantle surface with the influence of a subduction and within-plate components.
Źródło:
World Scientific News; 2019, 126; 65-87
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A possible role of chitin in the pathogenesis of asthma and allergy
Autorzy:
Brinchmann, B.Ch.
Bayat, M.
Brogger, T.
Muttuvelu, D.V.
Tjonneland, A.
Sigsgaard, T.
Powiązania:
https://bibliotekanauki.pl/articles/51618.pdf
Data publikacji:
2011
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2011, 18, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetization Reversal in Cobalt Nanocolumn Structures Obtained by Glancing Angle Deposition
Autorzy:
Buchta, K.
Schmidt, Ch.
Trykowski, G.
Biniak, S.
Kempiński, M.
Luciński, T.
Powiązania:
https://bibliotekanauki.pl/articles/1428548.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Ak
73.50.-h
73.61.-r
Opis:
An advanced deposition technique known as glancing angle deposition was used to fabricate randomly seeded magnetic cobalt columnar nanostructures. The existence of nanocolumns was confirmed by the cross-section scanning electron microscopy. The evolution in the magnetization reversal mechanism as a function of the film thickness was investigated. The coercivity $H_{C}$ and $M_{R}//M_{S}$ ratio (where $M_{R}$ and $M_{S}$ denote the remanent and saturation magnetization, respectively), derived from the magnetic hysteresis loops, are discussed as a function of the angle between the external magnetic field and the surface normal. The direction of the magnetization easy/hard axis and the columns inclination angle were determined on the basis of the angular dependences of the $H_{C}$ and the $M_{R}//M_{S}$. A crossover from the coherent rotation, based on the Stoner-Wohlfarth model, to the curling reversal mode was observed.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1222-1224
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sire pedigree error estimation and sire verification of the Taiwan dairy cattle population by using SNP markers
Autorzy:
Chao, C.H.
Yeh, Y.H.
Chen, Y.M.
Lee, K.H.
Wang, S.H.
Lin, T.Y.
Powiązania:
https://bibliotekanauki.pl/articles/16539078.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Holstein cattle
genetic testing
sire pedigree
Opis:
Information regarding the correct pedigree of and relationship between animals is useful for managing dairy breeding, reducing inbreeding, estimating breeding value, and establishing correct breeding programs. Additionally, the successful implementation of progeny testing is crucial for improving the genetics of dairy cattle, which depends on the availability of correct pedigree information. Incorrect pedigree information leads to bias in bull evaluation. In this study, Neogen GeneSeek Genomic Profiler (GGP) 50K SNP chips were used to identify and verify the sire of Taiwanese Holstein dairy cattle and analyze the reasons that lead to incorrect sire records. Samples were collected from 2,059 cows of 36 dairy farms, and the pedigree information was provided by breeders. The results of sire verification can be divided into three categories: submitted unconfirmed sire, submitted confirmed sire, and incorrectly submitted verified sire. Data on the sires of 1,323 (64.25%) and 572 (27.78%) dairy cows were verified and discovered, respectively. Sires of 1,895 (92.03%) dairy cattle were identified, which showed that the paternal pedigree of dairy cattle could be discovered and verified through genetic testing. An error-like analysis revealed that the data of 37 sires were incorrectly recorded because the bull’s NAAB code number was incorrectly entered into the insemination records: for 19 sires, the wrong bull was recorded because the frozen semen of a bull placed in the wrong storage tank was used, 6 had no sire records, and for 12 sires, the NAAB code of the correct bull was recorded but with a wrong stud code, marketing code, or unique number for the stud or breed. To reduce recorded sire error rates by at least 27.78%, automated identification of the mated bull must be adopted to reduce human error and improve dairy breeding management on dairy farms.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 1; 61-65
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of the capillary pressure-saturation pore-size distribution parameter on geological carbon sequestration estimates
Autorzy:
Cheng, Ch.-L.
Perfect, E.
Yu, T. E.
Gragg, M. J.
Powiązania:
https://bibliotekanauki.pl/articles/91981.pdf
Data publikacji:
2017
Wydawca:
Główny Instytut Górnictwa
Tematy:
geological carbon sequestration
numerical modeling
capillary pressure
saturation
cost estimate
geologiczna sekwestracja węgla
modelowanie numeryczne
ciśnienie kapilarne
nasycenie
szacowanie kosztów
Opis:
Cost estimates for geologic carbon sequestration (GCS) are vital for policy and decision makers evaluating carbon capture and storage strategies. Numerical models are often used in feasibility studies for the different stages of carbon injection and redistribution. Knowledge of the capillary pressure-saturation function for a selected storage rock unit is essential in applications used for simulating multiphase fluid flow and transport. However, the parameters describing these functions (e.g. the van Genuchten m pore size distribution parameter) are often not measured or neglected compared to other physical properties such as porosity and intrinsic permeability. In addition, the use of average instead of point estimates of m for numerical simulations of flow and transport can result in significant errors, especially in the case of coarse-grained sediments and fractured rocks. Such erroneous predictions can pose great risks and challenges to decision-making. We present a comparison of numerical simulation results based on average and point estimates of the van Genuchten m parameter for different porous media. Forward numerical simulations using the STOMP code were employed to illustrate the magnitudes of the differences in carbon sequestration predictions resulting from the use of height-averaged instead of point parameters. The model predictions were converted into cost estimates and the results indicate that varying m values in GCS modeling can cause cost differences of up to hundreds of millions dollars.
Źródło:
Journal of Sustainable Mining; 2017, 16, 3; 67-72
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projekt MATLAS - Zaawansowane metody inżynierii materiałowej w diagnostyce dzieł sztuki poddanych renowacji laserowej za pomocą kształtowanych, wysokoenergetycznych impulsów promieniowania
MATLAS project - Advanced methods of materials engineering in diagnostics of art works after renovation by means of shaped, high-energy laser radiation pulses
Autorzy:
Ciupiński, Ł.
Fortuna-Zaleśna, E.
Garbacz, H.
Onyszczuk, T.
Koss, A.
Mróz, J.
Zatorska, A.
Chmielewski, K.
Jeżewska, E.
Zambrzycki, P.
Jeziorowski, M.
Marczak, J.
Strzelec, M.
Sarzyński, A.
Ostrowski, R.
Skrzeczanowski, W.
Rycyk, A.
Spaarschuh, Ch.
Wedvik, B.
Powiązania:
https://bibliotekanauki.pl/articles/217530.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Konserwatorów Zabytków
Tematy:
dzieło sztuki
projekt MATLAS
inżynieria materiałowa
art work
MATLAS project
materials engineering
Opis:
Projekt MATLAS PL0259, realizowany w ramach Mechanizmu Finansowego EOG/Norweskiego Mechanizmu Finansowego, w Obszarze Priorytetowym "Konserwacja Europejskiego Dziedzictwa Kultury", został z powodzeniem rozpoczęty w lipcu 2008 r. Naukowe cele projektu obejmują opracowanie metod diagnostyki powierzchni dzieł sztuki wykonanych z metali (stopów) w celu ich bezpiecznej renowacji laserowej, opracowanie systemu laserowego zdolnego do generacji impulsów o wymaganym w renowacji, kontrolowanym kształcie i czasie trwania oraz analizy zjawisk indukowanych przez impulsy laserowe na powierzchni obiektów historycznych. Artykuł przedstawia uczestniczące w projekcie ośrodki naukowe, projekt i wykonanie laserowego systemu czyszczącego oraz metodykę badań eksperymentalnych. Podsumowuje on również najnowsze wyniki projektu oraz przedstawia metalowe dzieła sztuki wybrane do badań, wraz z ich analizami historycznymi i strukturalnymi.
MATLAS project PL0259 successfully started in July 2008 under the EEA Financial Mechanism/ Norwegian Financial Mechanism and in the Key Priority Section "Conservation of European Cultural Heritage". The scientific aims of the project include: development of diagnostic methods for analysis of metal (alloy) artworks surfaces for safe laser renovation; development of a laser system capable of generating pulses with controlled shape and time duration required for renovation, and analysis of phenomena induced by laser pulses in the treated surfaces of historical objects. The paper presents participating scientific teams, design and realization of laser cleaning system and methodology of experimental investigations. It also summarizes the latest project results and presents metal artworks selected for examination with their historical and structural analysis.
Źródło:
Wiadomości Konserwatorskie; 2010, 27; 171-176
0860-2395
2544-8870
Pojawia się w:
Wiadomości Konserwatorskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Volatile profiles of toxigenic and non-toxigenic Aspergillus flavus using SPME for solid phase extraction
Autorzy:
De, Lucca A J
Boue, S.M.
Carter-Wientjes, C.H.
Bland, J.M.
Bhatnagar, D.
Cleveland, T.E.
Powiązania:
https://bibliotekanauki.pl/articles/50286.pdf
Data publikacji:
2010
Wydawca:
Instytut Medycyny Wsi
Tematy:
Aspergillus flavus
toxigenic strain
non-toxigenic strain
secondary metabolite
aflatoxin
maize
volatile profile
solid-phase microextraction
solid-phase extraction
potato
isolate
Źródło:
Annals of Agricultural and Environmental Medicine; 2010, 17, 2; 301-308
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geomechanical aspects of hydraulic fracture propagation in the Lublin shale gas field in Poland
Autorzy:
Dhital, Ch.
Knez, D.
Śliwa, T.
Powiązania:
https://bibliotekanauki.pl/articles/299235.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
shale gas
hydraulic fracture simulation
Opis:
The recent boom in shale gas exploration around the world has sparked a paradigm shift in energy security in many countries in the world. With the successful exploration of shale gas production in the United State’s, many operators are trying to replicate the success in other parts of the world specifically in European countries where the presence of organic rich shale deposits have signaled a promising investment for the recovery of shale gas. Perspective studies for the Polish shale gas field in Poland have been ongoing. One part of this project is the comparison of hydraulic fracture thickness between the U.S shale gas field and Polish for better and effective design and modeling of reservoirs for the optimal exploration and recovery of shale gas. Successful production of natural gas from Polish basins requires a hydraulic fracture stimulation to unlock the gas trapped in the shales coupled with a geologic analysis of the shale rocks.
Źródło:
AGH Drilling, Oil, Gas; 2015, 32, 4; 703-711
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formy i charakterystyki parametrów splotowego modelu pośrednich możliwości dla ruchów do pracy w dużych aglomeracjach
Forms and characteristics of intervening opportunities parameters for work based travels in agglomerations
Autorzy:
Glogowski, Ch.
Zipser, T.
Powiązania:
https://bibliotekanauki.pl/articles/248537.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
Tematy:
teoria pośrednich możliwości
hipoteza rozkładu splotowego
model wymiany ruchu
parametry modelowe
intervening opportunities
convolution model
trip distribution
modelling parameters
Opis:
Problematyka właściwego doboru parametrów i określenie ich wartości liczbowych w modelach wymiany ruchu stanowi kluczowe zagadnienie dla ich właściwego zastosowania. Modele oparte na klasycznej teorii pośrednich możliwości, jakkolwiek z definicji jednoparametrowe, doczekały się wielu publikacji odnoszących się do sterującego procesem rozkładu podróży parametru selektywności. Hipoteza splotowa wprowadza jednak dwa rozkłady prawdopodobieństwa, wykładniczy z selektywnością jako parametrem i rozkład równomierny, którego zakres i wartości liczbowe należy dopiero określić, aby uzyskać właściwy typ rozkładu splotowego. Problematyka ta stoi w centrum uwagi niniejszego opracowania. Analizie poddano rozkłady podróży do pracy uzyskane na podstawie wyników badań empirycznych. Określone na ich podstawie typy występujących rozkładów, zakres i wartości liczbowe parametrów skonfrontowano następnie z teoretycznymi wykresami rozkładów splotowych. Zwrócono przy tym uwagę na przestrzenne aspekty występowania poszczególnych wariantów splotu . Powyższe rozważania zilustrowano na przykładzie trzech aglomeracji, Wrocławia, Frakfurtu n. Menem i Kassel.
The intervening opportunities model operates with a parameter – the stable contact selectivity. Since the selectivity constitutes the density of the probability of acceptance it may be sensitive also to the opportunities clustering in extremely attractive areas. The modification is based on certain regularities observed in cumulative distribution diagrams of actual trips plotted on the coordinative basis of the number of possible destinations and not of the covered distance. These regularities are concerned with the diagram concavity. The position of which correlates very often with the area of agglomeration core. Detailed analysis of regularities led to the hypothesis: the distribution of the probability of opportunity acceptance lying in a defined position is the convolution of two distributions of probability. One distribution concerning the probability of acceptance itself is the negative exponential distribution. The second probability distribution is a uniform one and has to be responsible for the decrease of the acceptance. This form of the model allowed us to obtain a very good representation of the real situation. Some types of existing configurations of convolution distribution were stated on the basis of observations made in Wroclaw and Frankfurt/Main and Kassel. The adequate interpretation of the reason for the diversity is actual goal of investigation.
Źródło:
Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne; 2012, 1(97); 77-99
1231-9171
Pojawia się w:
Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absorption of Thin ZnSe, ZnS and ZnS$\text{}_{x}$Se$\text{}_{1-x}$ Films under High Hydrostatic Pressure
Autorzy:
Griebl, E.
Schőtz, G.
Birzer, Ch.
Kerner, W.
Reisinger, T.
Hahn, B.
Gebhardt, W.
Powiązania:
https://bibliotekanauki.pl/articles/1934060.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Ga
71.35.+z
Opis:
We present absorption measurements on free-standing ZnSe, ZnS and ZnS$\text{}_{x}$Se$\text{}_{1-x}$ films (d = 0.4...2 μm) under hydrostatic pressure up to 15 GPa. The refraction index n(λ,P) of ZnS and ZnSe in the transparent region up to 800 nm and the pressure shift of the E0 absorption edge of ZnSe and some ZnS$\text{}_{x}$Se$\text{}_{1-x}$-compositions was investigated at 293 K. At 2 K free exciton states near the E$\text{}_{0-}$ and E$\text{}_{0}$ + Δ$\text{}_{0}$-gap are visible in absorption. Increase in the Rydberg energy under pressure was found, which is explained with k • p-theory in the framework of the hydrogen model.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 995-999
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A concurrent presentation of nonspecific colitis as well as likely myocarditis
Autorzy:
Heavener, T.
Jepson, M.
Bushe, B.
Thotakura, S.
Chiles, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/1918592.pdf
Data publikacji:
2018-06-21
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
colitis
myocarditis
ST segment elevation
coronary vasospasm
Opis:
An ST-segment elevation myocardial infarction represents a time-sensitive cardiac pathology with utmost importance placed upon timely coronary angiography with percutaneous coronary intervention. While emphasis is placed on atherosclerotic or thrombotic coronary occlusion, it is important to recognize other etiologies which may present in a similar fashion. This case demonstrates a 71-year-old female patient with prior coronary artery disease and stenting who presented with acute abdominal pain and elevated cardiac biomarkers as well as ST-segment elevation on initial EKG. Coronary angiography revealed only mild to moderate coronary lesions and patent stents while echocardiography was essential unchanged from prior evaluation. Computed tomography of the abdomen would show findings suggestive of infectious colitis and empiric antibiotics led to full resolution of symptoms. While no definitive cause for her cardiac manifestations was discovered, the authors propose coronary vasospasm or myo-pericarditis as likely etiologies in response to an overwhelming inflammatory state. The case underscores the importance of formulating a comprehensive differential diagnosis during the initial workup of a ST-segment elevation myocardial infarction.
Źródło:
Progress in Health Sciences; 2018, 8(1); 225-230
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication Of Porous Ti By Thermal Decomposition And Sintering Of PMMA/TiH2 Powder Compact
Wytwarzanie porowatego tytanu przez rozkład termiczny i spiekanie wyprasek PMMA/TiH2
Autorzy:
Jeon, K. Ch.
Kim, Y. D.
Suk, M.-J.
Oh, S.-T.
Powiązania:
https://bibliotekanauki.pl/articles/352341.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
porous Ti
PMMA powders
thermal decomposition of TiH2
pore structure
porowaty tytan
PMMA
rozkład termiczny
struktura porów
Opis:
Porous Ti with controlled pore structure was fabricated by thermal decomposition and sintering process using TiH2 powders and Polymethylmethacrylates (PMMA) beads as pore forming agent. The beads sizes of 8 and 50 μm were used as a template for fabricating the porous Ti. The TiH2 powder compacts with 20 and 70 vol% PMMA were prepared by uniaxial pressing and sintered for 2 h at 1100°C. TGA analysis revealed that the PMMA and TiH2 were thermally decomposed at about 400°C forming pores and at about 600°C into metallic Ti phase. The porosity increased with increase in the amount of PMMA addition. Also, the microstructure observation showed that the pore size and shape were strongly dependent on the PMMA shapes.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1375-1377
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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