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Tytuł:
Efektywność tłumienia zaburzeń doziemnych filtrów silnikowych LC w napędach z falownikami napięciowymi zasilanymi z sieci IT
Efficiency of the impairment of ground current disturbances of LC engine filters in the drives with voltage inverters supplied from an IT network
Autorzy:
Szymański, J.
Szymański, B.
Powiązania:
https://bibliotekanauki.pl/articles/187663.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG
Tematy:
silnikowe filtry pasywne LC
passive LC motor filters
Opis:
W artykule zawarto porównanie wybranych właściwości silnikowych filtrów pasywnych LC, ograniczających prądy doziemne kabli silnikowych i silników, w napędach z napięciowymi przemiennikami częstotliwości. Przeprowadzono badania filtrów LC stosowanych w napędach zasilanych z sieci nieuziemionych typu IT. W badaniach oceniających efektywność filtracji napięcia zaburzeń wspólnych uwzględniono takie kryteria jak: napięcie względem ziemi punktu neutralnego uzwojeń stojana silnika i prąd doziemny w przewodzie ochronnym PE oraz napięcie fazowe i międzyfazowe na zaciskach silnika.
In the article basic features' comparison of different kinds of passive LC motor filters, utilized in order to reduce inverter's the differential and common voltage in the frequency converters drives, is presented. Filters' examinations were prepared for non-grounded power supply of electrical drives (IT mains) where parasitic ground capacitances of a screened motor cable have significant value. Filters were compared under following criteria: voltage of stator windings neutral point to grounded motors cover, high frequency parasitic current in PE conductor, value of motor phase-ground and phase-phase voltage. Examinations were made for unscreened and screened motor cables.
Źródło:
Mechanizacja i Automatyzacja Górnictwa; 2011, R. 49, nr 7, 7; 25-34
0208-7448
Pojawia się w:
Mechanizacja i Automatyzacja Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Completion of a half linearly cyclically ordered group
Autorzy:
Černák, Štefan
Powiązania:
https://bibliotekanauki.pl/articles/729059.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
dedekind cut
cyclically ordered group
lc-group
half lc-group
completion of a half lc-group
Opis:
The notion of a half lc-group G is a generalization of the notion of a half linearly ordered group. A completion of G by means of Dedekind cuts in linearly ordered sets and applying Świerczkowski's representation theorem of lc-groups is constructed and studied.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2002, 22, 1; 5-23
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie falowników rezonansowych w przemyśle elektromaszynowym i wydobywczym
Application of resonance inverters in the electric machine and mining industry
Autorzy:
Marek, A.
Powiązania:
https://bibliotekanauki.pl/articles/186005.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG
Tematy:
falownik L-LC
falownik rezonansowy
inverter L-LC
resonance inverter
Opis:
Celem artykułu jest przedstawienie i omówienie najczęściej stosowanych układów zasilających nagrzewnice indukcyjne, ich właściwości oraz porównanie ich z proponowanym rozwiązaniem w postaci falownika L-LC.
The paper aims at a presentation and a discussion on the mostly used power supply systems for induction heaters, their characteristics and comparison to a suggested system in the form of an inverter L-LC.
Źródło:
Mechanizacja i Automatyzacja Górnictwa; 2009, R. 47, nr 2, 2; 17-22
0208-7448
Pojawia się w:
Mechanizacja i Automatyzacja Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Note on Gödel-Dummet Logic LC
Autorzy:
Robles, Gemma
Méndez, José M.
Powiązania:
https://bibliotekanauki.pl/articles/2033854.pdf
Data publikacji:
2021-07-01
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Intermediate logics
Gödel-Dummet logic LC
Opis:
Let \(A_{0},A_{1},...,A_{n}\) be (possibly) distintict wffs, \(n\) being an odd number equal to or greater than 1. Intuitionistic Propositional Logic IPC plus the axiom \((A_{0}\rightarrow A_{1})\vee ...\vee (A_{n-1}\rightarrow A_{n})\vee (A_{n}\rightarrow A_{0})\) is equivalent to Gödel-Dummett logic LC. However, if \(n\) is an even number equal to or greater than 2, IPC plus the said axiom is a sublogic of LC.
Źródło:
Bulletin of the Section of Logic; 2021, 50, 3; 325-335
0138-0680
2449-836X
Pojawia się w:
Bulletin of the Section of Logic
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collisional Line Shapes in the Presence of Broad-Band Squeezed Vacuum
Autorzy:
Cong, N. H.
Vinh, L. V.
Powiązania:
https://bibliotekanauki.pl/articles/2025783.pdf
Data publikacji:
2001-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Lc
42.50.Ct
Opis:
In this paper we discuss the line shapes of a two-level atom in the presence of broad-band squeezed vacuum and collisional broadening. We describe the collisions and the squeezed vacuum using a stochastic model of Rabi amplitude fluctuations. From such a stochastic description the fast and the slow damping rates of the Bloch polarizations are obtained. The strong field resonance fluorescence spectrum in the presence of stochastic broad-band squeezed vacuum and collisions is derived.
Źródło:
Acta Physica Polonica A; 2001, 99, 5; 545-555
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Phase Transition of Co-Ni-Si-B Amorphous Alloy
Autorzy:
Jakubczyk, E.
Powiązania:
https://bibliotekanauki.pl/articles/2027394.pdf
Data publikacji:
2001-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.20.Lc
64.70.Pf
Opis:
Structural changes of Co$\text{}_{66}$Ni$\text{}_{12}$ Si$\text{}_{9}$B$\text{}_{13}$ amorphous alloy, stimulated by isochronal and isothermal annealing, were observed by means of the methods: electrical resistivity, Hall effect and X-ray diffraction. In the amorphous matrix at the temperature 673 K phasesα-Co and (Co,Ni)$\text{}_{5}$Si$\text{}_{2}$B are created, while at the temperature 773 K the phase (Co,Ni)$\text{}_{3}$B is formed. The structural phase transitions are related to abrupt decrease in electrical and Hall resistivities at the background of systematic decrease in these parameters values during the alloy transition from the amorphous to the crystalline state.
Źródło:
Acta Physica Polonica A; 2001, 99, 6; 673-681
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solute-Solvent Interaction in Aqueous Solutions Studied by Optical Kerr Effect
Autorzy:
Błaszczak, Z.
Farhoud, M.
Powiązania:
https://bibliotekanauki.pl/articles/1963257.pdf
Data publikacji:
1997-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Lc
42.65.An
Opis:
Solute-solvent interactions were studied by a method based on laser induced optical birefringence in aqueous solutions. The paper reports results of the optical Kerr constant measurements for binary liquid mixtures of aqueous solution of methanol, ethanol, n-propanol and acetone at room temperature in a wide range of concentrations. At 50% concentration of the above mentioned alcohols, the temperature dependence of the laser induced optical birefringence was also measured in the range from 283 K to 315 K. These data together with the density and refractive index were used to calculate the optical and specific Kerr constants. Moreover, these data enabled the calculation of the anisotropic factors, optical anisotropy and orientation function of the substances studied.
Źródło:
Acta Physica Polonica A; 1997, 91, 3; 531-541
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Circularly Polarized Light-Induced Axial Anisotropy in Achiral Isotropic Media. Magnetic Dipole Interaction with Radiation
Autorzy:
Woźniak, S.
Powiązania:
https://bibliotekanauki.pl/articles/1931345.pdf
Data publikacji:
1994-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Lc
42.65.An
Opis:
The analytical explanation of axial birefringence revealed earlier by the technique of field applied molecular dynamics computer simulation is given. The point group symmetries of achiral molecules admitting the effect are determined and the estimation of the anisotropy is presented. The effect may give information on off-diagonal elements of the Rosenfeld polarizability tensor of achiral molecules.
Źródło:
Acta Physica Polonica A; 1994, 85, 6; 899-905
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Noise Characteristics of Nonlinear Optical Amplifiers
Autorzy:
Boyd, R. W.
Agarwal, G. S.
Davis, W. V.
Gaeta, A. L.
Nagasako, E. M.
Kauranen, M.
Powiązania:
https://bibliotekanauki.pl/articles/1931479.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.-k
42.50.Lc
Opis:
Quantum mechanical arguments show that any optical amplifier must add noise to the amplified beam of light. For the case of a high gain amplifier with a coherent (Poissonian) input, the signal-to-noise ratio of the amplified beam must be at least two times smaller than that of the incident beam. We review the theoretical basis of this prediction. We also describe the results of our experimental investigations of the noise properties of optical amplifiers that utilize the nonlinear optical response of strongly driven atomic transitions.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 117-126
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Instabilities and Decoherence Problem
Autorzy:
Kilin, S. Ya.
Horoshko, D. B.
Shatokhin, V. N.
Powiązania:
https://bibliotekanauki.pl/articles/1968521.pdf
Data publikacji:
1998-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Lc
03.65.Bz
Opis:
A decoherence problem is discussed by means of quantum continuous measurement theory. It is shown that the conditional state of quantum system interacting with a bath preserves its initial purity. In this presentation decoherence arises as a result of averaging over the stochastic times of reduction moments ("clicks"). A method based on external phase feedback is proposed to slow down the decoherence of field superposition state in an open optical cavity. It is also shown that an atom placed inside the optical cavity plays a role of internal self-organized positive feedback between field and atom, which leads to an exponential increase in the mean dipole moment of the atom for the field initially prepared in a superposition of coherent states, i.e. to quantum instability.
Źródło:
Acta Physica Polonica A; 1998, 93, 1; 97-104
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cantor extension of a half lineary cyclically ordered group
Autorzy:
Černák, Štefan
Powiązania:
https://bibliotekanauki.pl/articles/728774.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
convergent sequence
fundamental sequence
C-complete half lc-group
Cantor extension of a half lc-group
Opis:
Convergent and fundamental sequences are studied in a half linearly cyclically ordered group G with the abelian increasing part. The main result is the construction of the Cantor extension of G.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2001, 21, 1; 31-46
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ograniczanie wysokoczęstotliwościowych prądów doziemnych w napędach z falownikami napięciowymi zasilanymi z sieci górniczych
High frequency ground current reduction of frequency converter drives supplied from mining power system
Autorzy:
Szymański, J.
Szymański, B.
Kasztelewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/171284.pdf
Data publikacji:
2011
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
elektroenergetyczna sieć górnicza
falownik
filtr LC
napęd silnika
mining power system
motor drive
frequency converter
LC filter
Opis:
W artykule zawarto porównanie wybranych właściwości silnikowych filtrów pasywnych LC, ograniczających wysokoczęstotliwościowe prądy doziemne płynące przez pojemności pasożytnicze kabli silnikowych i silników. Przeprowadzono badania wybranych filtrów LC stosowanych w napędach zasilanych z sieci górniczych, w układzie sieciowym typu IT. W badaniach oceniających efektywność filtracji prądów doziemnych uwzględniono takie kryteria jak: napięcie względem ziemi punktu neutralnego uzwojeń stojana silnika, prąd doziemny w przewodzie ochronnym PE oraz napięcie fazowe zasilania przemiennika częstotliwości i napięcie międzyfazowe zasilania silnika.
In the article basic features' comparison of different kinds of passive LC motor filters, utilized in order to reduce inverter's the differential and common voltage in the frequency converters drives, is presented. Filters' examinations were prepared for non-grounded power supply of electrical drives (IT mains) where parasitic ground capacitances of a screened motor cable have significant value. Filters were compared under following criteria: voltage of stator windings neutral point to grounded motors cover, high frequency parasitic current in PE conductor, value of frequency converter phase-ground and value of motor phase-phase voltage. Examinations were made for unscreened and screened motor cables.
Źródło:
Górnictwo Odkrywkowe; 2011, 52, 5; 7-14
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and validation of rapid LC-MS with electrospray ionization for the quantification of pramipexole in human plasma
Autorzy:
Lavudu, P.
Rani, A. P.
Sekharan, C. B.
Powiązania:
https://bibliotekanauki.pl/articles/411617.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Pramipexole
LC-MS
human plasma
bioanalytical metod
Opis:
A rapid, accurate and precise LC-MS method is described for the quantitative determination of pramipexole in human plasma matrix using ropinirole as internal standard. Pramipexole and ropinirole were extracted from plasma by liquid-liquid extraction technique. The method was validated over the concentration range of 100-2514 pg/mL. The method was found to have acceptable accuracy, precision, linearity and selectivity. The mean extraction recovery from spiked plasma samples was in the range of 79.415-87.00 %. The intra-day accuracy of the assay ranged from 98.924 to 112.236 % and intra-day precision ranged from 3.489 to 6.756 %. Inter-day accuracy and precision results for quality control samples ranged between 100.340 and 107.443% of nominal and precision is observed to be 3.970-5.714 %. The pramipexole was found to be stable after several stability studies. The proposed method yielded a quick, simple and reliable protocol for estimating pramipexole concentrations in human plasma.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 18; 1-15
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mass Spectrometric Detection of New Betalains in Mammillaria Flowers
Autorzy:
Szot, Dominika
Starzak, Karolina
Skopińska, Anna
Wybraniec, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1034229.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Cactaceae
LC-MS
Mammillaria
betacyanins
natural pigments
Opis:
Betacyanins are natural, red-violet betalain pigments which can be found in plenty of plants of the Cactaceae family. The Mammillaria is the widest genus of the Cactaceae family of which fruit was examined for betacyanins contents. As a result of the investigation, a new pigment structure, mammillarinin, was identified. Heretofore, no betacyanins of Mammillaria coronata flowers has been extensively studied. In this report, the results of betacyanin analysis by LC-DAD-ESI-MS/MS in the flower extract are presented.
Źródło:
Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe; 2015, 10; 189-196
2082-3827
2084-977X
Pojawia się w:
Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous determination of lopinavir, saquinavir and ritonavirin in human plasma using liquid chromatography – ion trap mass spectrometry
Autorzy:
Lipiński, Marcin
Bielawski, Krzysztof P.
Słomińska, Ewa M.
Smoleński, Ryszard T.
Powiązania:
https://bibliotekanauki.pl/articles/1891025.pdf
Data publikacji:
2021-12-02
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
antiviral therapy
lopinavir
saquinavir
ritonavir
LC/MS
Opis:
Background: Lopinavir, saquinavir, and ritonavir are viral protease inhibitors (PIs) developed for and widely used in the therapy of human immunodeficiency virus (HIV)-related disease. These compounds are also active in vitro against the pathogens causing tuberculosis, malaria and coronavirus infections. PIs have been regarded as a platform for the design of inhibitors targeting severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-encoded proteases. This study aimed to develop a liquid chromatography/mass spectrometry (LC/MS) procedure for accurate simultaneous determination of concentrations of these three PIs in the plasma. Methods: Samples of human plasma were protein precipitated with 0.3 M zinc sulfate in a water/methanol solution (30:70, v/v). The extracts were analyzed with reversed-phase chromatography coupled with the electrospray ionization (ESI) source of the ion trap mass detector operating in mEass spectrometry (MS) and tandem mass spectrometry (MS/MS) modes. Results: Calibration curves demonstrated good linearity from 0.01 to 10 µg/mL and acceptable reproducibilities and recoveries. Conclusions: The described procedure proves that a very basic ion-trap LC/MS system could be applied for selective, rapid, and precise determination of antiviral protease inhibitors.
Źródło:
European Journal of Translational and Clinical Medicine; 2021, 4, 2; 60-67
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dissipation of methomyl residues in tomato fruits, soil and water using LC-MS/MS
Autorzy:
El-Hefny, D.
Abdallah, I.
Helmy, R.
Mahmoud, H.
Powiązania:
https://bibliotekanauki.pl/articles/2084623.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dissipation
LC-MS/MS
methomyl
tomato
QuEChERS
Opis:
Tomato is an economically important vegetable crop which is attacked heavily by insect pests leading to reduction of yield and quality of the fruits. Field experiments were carried out to investigate the dissipation of methomyl (a common insecticide) used mainly on tomato fruits. LC-MS/MS coupled with the QuEChERS method were used for the determination of methomyl. The results showed that the recovery using matrix-matched standards ranged from 87.8 to 101.3%, with relative standard deviation of 2.5 to 7.5%. Kinetics equation, Log R = log R0 – 0.434 Kt, was used to calculate the rate of degradation in tomato, soil and water. Residue half-life calculated using kinetic rate ranged from 1.95 to 1.63 days in tomato and soil, respectively. From the results it was concluded that tomato fruits can be safely harvested for consumption after 15 days of application based on estimated preharvest interval (PHI). It is advisable to re-estimate the PHI regularly owing to data from the EU and Codex.
Źródło:
Journal of Plant Protection Research; 2019, 59, 3; 355-361
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Rapid Analysis of two Classes of Pesticides in Food Wastewater by Quechers-Liquid Chromatography/Mass Spectrometry
Autorzy:
Łozowicka, B.
Kaczyński, P.
Szabuńko, J.
Ignatowicz, K.
Warentowicz, D.
Łozowicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/123585.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
wastewater
azole
neonicotinoids
QuEChERS
LC-MS/MS
Opis:
The rapid analytical method was developed in response to increasing concern over the environmental impact of azoles (sterol biosynthesis inhibitors) and neonicotinoids (nicotinic acetylcholine receptor site). These chemicals are commonly used to protect fruit and vegetables crops against fungi and pests. Seven insecticides and twenty one fungicides commonly occurring in food industrial wastewater have been determined. For this purpose, active substances from two new pesticide classes were extracted and isolated by QuEChERS by addition of acetonitrile, buffering salts and chitin as a clean-up sorbent. The novelty of this procedure was one step sample preparation including extraction and removing of co-extracts in short time. Instrumental analysis was conducted by liquid chromatography coupled with mass spectrometry using multiple reaction monitoring. The limits of detection ranged from 0.002 to 0.005 μg·L-1 with satisfactory accuracy and precision The recoveries for the pesticides ranged from 81–103%, with high repeatability (n = 3, RSD ≤ 9%) and low LOQs (0.01 μg·L-1). Matrix effects calculated were less than 12% for all analyses. The method was applied to routine analysis of food industrial wastewater. Concerning the results, total pesticide levels in most cases were below 1 μg·L -1. The most significant pesticides in terms of concentration and frequency of detection were acetamiprid (0.07 μg· L-1); tebuconazole (1.2 μg· L-1) and thiacloprid (0.04 μg·L-1).
Źródło:
Journal of Ecological Engineering; 2016, 17, 3; 97-105
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przegląd rodzajów chiralnych faz stacjonarnych oraz możliwości ich zastosowań w chromatografii cieczowej
Types of chiral stationary phases and its applications to liquid chromatography (LC) – a mini review
Autorzy:
Śliwka-Kaszyńska, M.
Momotko, M.
Szarmańska, J.
Boczkaj, G.
Kamiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/92336.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
chiralne rozdzielenie
chiralne fazy stacjonarne (CSP)
chromatografia cieczowa(LC)
chiral separation
Chiral Stationary Phases (CSP)
Liquid Chromatography (LC)
Opis:
Chromatograficzne rozdzielanie związków optycznie czynnych ma ogromne znaczenie nie tylko w przemyśle farmaceutycznym, ale i agrochemicznym, a także w badaniach naukowych różnego rodzaju. W niniejszym opracowaniu scharakteryzowano komercyjnie dostępne chiralne fazy stacjonarne na bazie, cyklodekstryn, polisacharydów, makrocyklicznych antybiotyków, eterów koronowych, a także fazy proteinowe, ligandowymienne, jonowymienne oraz fazy typu Pirkle’a. Omówiono podstawowe właściwości fizyczne i chemiczne w/w faz stacjonarnych, przedstawiono przykładowe ich struktury, mechanizmy chiralnego rozpoznania oraz podstawowe zastosowania. Opisano również warunki chromatograficznego rozdzielania chiralnego dla wybranych farmaceutyków i pestycydów.
Importance of chromatographic enantioseparations in the pharmaceutical and agrochemical industries is still increasing. In this paper the chiral stationary phases, including cyclodextrins, polysaccharides, macrocyclic antibiotics, crown ethers, proteins, ligand-exchange, Pirkle-type and ion exchange phases is discussed. For all types of chiral stationary phases, the basic physical and chemical properties are discussed, as well as the structure and the possible chiral recognition mechanisms. The basic applications of this phases are also described. Chromatographic conditions for chiral separation of selected active pharmaceutical ingredients and pesticides are reviewed.
Źródło:
Camera Separatoria; 2015, 7, 2; 99-128
2083-6392
2299-6265
Pojawia się w:
Camera Separatoria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cytotoxic Test of Octopus cyanea Ink Extract
Autorzy:
Kalor, John Dominggus
Simaremare, Eva Susanty
Futwembun, Allowisya
Wabiser, Gloria
Gunawan, Elsye
Yabansabra, Yuliana Rut
Powiązania:
https://bibliotekanauki.pl/articles/125432.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
toxicity
Octopus cyanea
Artemia salina leach
LC50
Opis:
Marine biodiversity of Papua is very high, but unfortunately research and utilization in medicine are limited. Many species of flora and fauna are used in ethopharmacology as drugs but without scientific explanation, e.g. octopus (Octopus cyanea), found in the Northern Papua Sea. The aim of this research was to test the toxicity of the ethanol octopus ink. The toxicity was tested with the Brine Shrimp Lethality Test (BSLT) method. The samples were collected from the sea of Biak island in West Papua, extracted with ethanol, ethyl acetate, and dichloromethane then tested the toxicity for Artemia salina leach larvae. The toxicity test involved concentrations of 1000, 750, 500, 250, 100, 75, 50, and 25 ppm. The result showed that ethanol extract of octopus ink has LC50 of 290 ppm, ethyl acetate extract has LC50 of 947 ppm, whereas dicholoromethane extract – 2190 ppm.
Źródło:
Journal of Ecological Engineering; 2019, 20, 8; 144-152
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stabilisation of LC ladder network with the help of delayed output feedback
Autorzy:
Baranowski, J.
Mitkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/206281.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
stabilisation
delay differential equation
LC ladder network
D-partitions
Opis:
The paper presents a method of stabilisation of an LC ladder network with a delayed output feedback. A discussion of certain properties of tridiagonal matrices and formulation of the considered system in state space equations is included. Formal stability of the arising infinite dimensional system is described and stability conditions are formulated based on properties of characteristic quasipolynomial. The method of D-partitions is used to determine the stability regions in the controller parameter space. Paper includes examples for ladders of dimensions 1, 2 and 3 and a comparison with Padé approximation.
Źródło:
Control and Cybernetics; 2012, 41, 1; 13-34
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Application of Scattered Light in the Metrology of Planar Waveguides
Autorzy:
Gut, K.
Powiązania:
https://bibliotekanauki.pl/articles/1417959.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Ja
42.25.Lc
42.25.Fx
Opis:
The paper presents a measuring stand which permits to determine the attenuation and modal birefringence of planar waveguide structures. The light is introduced into the waveguide through a prismatic coupler. This permits to determine attenuations of the subsequent modes. Mounting the polarizer in front of the lens of the camera it becomes possible to determine on the same test stand the modal birefringence of orthogonal pair of modes of the same order.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 818-820
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaos via Period-Doubling Oscillations in an Exciton-Carrier-Photon System Driven by Optical Pumping
Autorzy:
Nguyen, Ba An
Powiązania:
https://bibliotekanauki.pl/articles/1930622.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.-k
71.35.+z
42.50.Lc
Opis:
A detailed stability analysis is performed for a highly excited semiconductor modelled as an exciton-electron-hole-photon system driven externally by optical pumping. Chaotic self-pulsations are shown to occur on both the upper and lower branches of the bistable steady state curve of the system via a sequence of period-doubling oscillation process. Such a route to chaos is well known in laser physics and in other nonlinear systems but not in highly excited semiconductors yet.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 541-552
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magneto-Optical Characteristics of Human Serum
Autorzy:
Surma, M.
Bućko, J.
Bąk, G.
Ciszek, M.
Powiązania:
https://bibliotekanauki.pl/articles/2014394.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Lc
78.20.Ek
78.20.Ls
Opis:
A study of magneto-optical circular birefringence of human serum from healthy subjects and cancer patients was performed. Significant differences in the magnetic field induced change of the natural optical activity of serum from healthy blood donors and neoplasmic patients were noted. The natural optical activity of blood is positive, irrespective of the donor health status, whereas the magnetic field induced (B > 10T) change in the natural optical activity of the serum from cancer patients is negative while that from healthy donors is positive. The value and sign of the characteristic magneto-optical marker of human serum was discovered in a study of the influence of very high magnetic fields on chiral media and interpreted on the basis of the recent developments in the theory of magnetic field induced optical circular birefringence in the media revealing natural optical activity. The blood serum is a chiral medium.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 533-542
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Atomic Motion in Amorphous Solids
Autorzy:
Schober, H.
Powiązania:
https://bibliotekanauki.pl/articles/2035455.pdf
Data publikacji:
2002-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Fs
61.20.Lc
81.05.Kf
Opis:
Glasses and amorphous materials show, coexisting with the sound waves, a variety of low energy excitations: tunneling, quasi-localized vibrations and relaxations. The latter two are observed well into the liquid state. Using molecular dynamics both were shown to be centred on more than ten atoms or molecular units, which form chain-like structures. With increasing frequency the interaction of the quasi-localized modes with the sound waves and with each other increases, they delocalize. However, even at the so-called boson peak frequency, where the sound waves become overdamped due to the interaction, the vibrations can be decomposed into local and extended modes. Closely correlated with the local vibrations are the local relaxations, which can be envisaged as collective jumps of groups of atoms. With rising temperature both the total jump length and the number of atoms participating increases. In the melt when single jumps are no longer resolved one still observes a collective motion of chains of atoms.
Źródło:
Acta Physica Polonica A; 2002, 102, 1; 83-93
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytochemical composition and antibacterial activity of ethanolic extract from trunk of Rothmannia wittii (Craib) Bremek. (Rubiaceae) newly found in Vietnam
Autorzy:
Van, H.T.
Nguyen, T.T.
Ton, H.T.T.
Dinh, K.T.T.
Le, V.S.
Pham, T.V.
Tran, G.B.
Powiązania:
https://bibliotekanauki.pl/articles/2096309.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Rothmannia wittii
extract
phytochemical composition
antibacterial activity
LC-MS
Opis:
Rothmannia wittii, which is found in Binh Chau-Phuoc Buu Nature Reserve, Bung Rieng ward, Xuyen Moc District, Ba Ria-Vung Tau Province, Vietnam, is a rare species of Rubiaceae family. The present study aimed to determine the phytochemical composition and antimicrobial activity of the ethanolic extract of the R. wittii trunk. A total of 10 compounds were identified by liquid chromatography-mass spectrophotometry (LC-MS), including 1) benzene, 1-(1,5-dimethyl-4- hexenyl)-4-methyl, 2) diphenylsulfone, 3) 6β-hydroxy-10-O-acetylgenipin, 4) cinnamyl-cinnamate, 5) genipin, 6) megastigmatrienone, 7) ethyl p-methoxy-trans-cinnamate, 8) rothalazepane, 9) 1,3,6-trimethylpyrano[2,3-d ]imidazole-2,5(1H,3H)-dione, and 10) shanzhiol. The extract also exhibited an antibacterial activity against six bacterial strains: Bacillus cereus, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Salmonella enteritidis, as determined via disk diffusion agar method.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 4; 301-307
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 93

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